919 lines
145 KiB
XML
919 lines
145 KiB
XML
<document id="8FE86A2651D42D5A12F9CBBD16D66C8E" ID-DOI="10.5281/zenodo.171941" ID-GBIF-Dataset="7e50302d-fdde-43da-aedd-b5b25f41e974" ID-ISSN="11755326" ID-Zenodo-Dep="171941" IM.metadata_approvedBy="felipe" IM.tables_requiresApprovalFor="existingObjects,plazi" IM.taxonomicNames_approvedBy="felipe" checkinTime="1459761061969" checkinUser="plazi" docAuthor="Schein, Elisabeth" docDate="2006" docId="7C25C765B27BFFCFFB02FDA6D4422C03" docLanguage="en" docName="zt01135p027.pdf" docOrigin="Zootaxa 1135" docStyle="DocumentStyle:FA7E419B012A62B0FC3AC15A186C3DAF.3:Zootaxa.2001-2006.journal_article" docStyleId="FA7E419B012A62B0FC3AC15A186C3DAF" docStyleName="Zootaxa.2001-2006.journal_article" docStyleVersion="3" docTitle="Sinepecten Schein, 2006, n. gen." docType="treatment" docVersion="8" lastPageNumber="16" masterDocId="801CBF1DB278FFC0FA0AFFBDD7212B4D" masterDocTitle="A new deepsea pectinid bivalve from thermal vents of Manus backarc Basin (southwestern Pacific), Sinepecten segonzaci n. gen., n. sp. (Pectinoidea: Pectinidae), and its relationships with the genera Bathypecten and Catillopecten" masterLastPageNumber="27" masterPageNumber="1" pageNumber="4" updateTime="1698215080610" updateUser="plazi">
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<mods:title id="B8E7277E89A13AB1328108938303872E">A new deepsea pectinid bivalve from thermal vents of Manus backarc Basin (southwestern Pacific), Sinepecten segonzaci n. gen., n. sp. (Pectinoidea: Pectinidae), and its relationships with the genera Bathypecten and Catillopecten</mods:title>
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<mods:name id="E3358C506095BEAEF1A75BE848430419" type="personal">
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<mods:namePart id="543F2EDEF507AAFB5325906DBB3F1C15">Schein, Elisabeth</mods:namePart>
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<mods:typeOfResource id="B3B3C2C8B65FCA8838BF31A83316919A">text</mods:typeOfResource>
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<mods:title id="9C7487E367ED5F208DA384535E23DDB1">Zootaxa</mods:title>
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<mods:part id="F627EDB55AB2F6143A9D7120A653167A">
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<mods:date id="A48106554BCEFA5EED9E2611ED75B787">2006</mods:date>
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<mods:detail id="8D2B96A733C9FC31F1587EB3E370DB78" type="volume">
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<mods:number id="EFA5C38D4E1B1AE0CC016957C78B02F4">1135</mods:number>
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<mods:classification id="BD3A00847AAED1404D7F65B7DB7B1DD8">journal article</mods:classification>
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<mods:identifier id="5A2C1DCF7C98426F2D75947940900F4C" type="DOI">10.5281/zenodo.171941</mods:identifier>
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<mods:identifier id="A07A4903568F4B8CBC52DCD5E8A04840" type="ISSN">11755326</mods:identifier>
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<mods:identifier id="4F7C1DABDC48166D2FC9CA8E92EA8959" type="Zenodo-Dep">171941</mods:identifier>
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<treatment id="7C25C765B27BFFCFFB02FDA6D4422C03" ID-DOI="http://doi.org/10.5281/zenodo.6255220" ID-GBIF-Taxon="119344895" ID-Zenodo-Dep="6255220" LSID="urn:lsid:plazi:treatment:7C25C765B27BFFCFFB02FDA6D4422C03" httpUri="http://treatment.plazi.org/id/7C25C765B27BFFCFFB02FDA6D4422C03" lastPageId="15" lastPageNumber="16" pageId="3" pageNumber="4">
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<subSubSection id="BC9625F8B27BFFC3FB02FDA6D51D2978" box="[264,572,539,566]" pageId="3" pageNumber="4" type="nomenclature">
|
||
<paragraph id="F4337673B27BFFC3FB02FDA6D51D2978" blockId="3.[264,572,539,566]" box="[264,572,539,566]" pageId="3" pageNumber="4">
|
||
<heading id="AF7BC11FB27BFFC3FB02FDA6D51D2978" bold="true" box="[264,572,539,566]" fontSize="11" level="1" pageId="3" pageNumber="4" reason="1">
|
||
<emphasis id="C6F8AA61B27BFFC3FB02FDA6D51D2978" bold="true" box="[264,572,539,566]" pageId="3" pageNumber="4">
|
||
Genus
|
||
<taxonomicName id="338C0DF0B27BFFC3FB55FDA1D6C2297B" box="[351,483,540,566]" class="Bivalvia" family="Pectinidae" genus="Sinepecten" kingdom="Animalia" order="Pectinoida" pageId="3" pageNumber="4" phylum="Mollusca" rank="genus" status="gen. nov.">
|
||
<emphasis id="C6F8AA61B27BFFC3FB55FDA1D6C2297B" bold="true" box="[351,483,540,566]" italics="true" pageId="3" pageNumber="4">Sinepecten</emphasis>
|
||
</taxonomicName>
|
||
<taxonomicNameLabel id="DDCB171AB27BFFC3FBE1FDA6D51D2978" box="[491,572,539,565]" pageId="3" pageNumber="4" rank="genus">n. gen.</taxonomicNameLabel>
|
||
</emphasis>
|
||
</heading>
|
||
</paragraph>
|
||
</subSubSection>
|
||
<subSubSection id="BC9625F8B27BFFC3FB02FDE6D482293B" box="[264,931,603,630]" pageId="3" pageNumber="4" type="etymology">
|
||
<paragraph id="F4337673B27BFFC3FB02FDE6D482293B" blockId="3.[264,1324,603,1870]" box="[264,931,603,630]" pageId="3" pageNumber="4">
|
||
<emphasis id="C6F8AA61B27BFFC3FB02FDE6D6B82938" bold="true" box="[264,409,603,629]" pageId="3" pageNumber="4">Etymology:</emphasis>
|
||
from Latin
|
||
<emphasis id="C6F8AA61B27BFFC3F82CFDE1D5742938" box="[550,597,604,629]" italics="true" pageId="3" pageNumber="4">sine</emphasis>
|
||
: without, and
|
||
<taxonomicName id="338C0DF0B27BFFC3F8F4FDE1D46B2938" box="[766,842,604,629]" class="Bivalvia" family="Pectinidae" genus="Pecten" kingdom="Animalia" order="Pectinoida" pageId="3" pageNumber="21" phylum="Mollusca" rank="genus">
|
||
<emphasis id="C6F8AA61B27BFFC3F8F4FDE1D46B2938" box="[766,842,604,629]" italics="true" pageId="3" pageNumber="4">pecten</emphasis>
|
||
</taxonomicName>
|
||
: comb.
|
||
</paragraph>
|
||
</subSubSection>
|
||
<subSubSection id="BC9625F8B27BFFC3FB32FD39D40C2873" pageId="3" pageNumber="4" type="diagnosis">
|
||
<paragraph id="F4337673B27BFFC3FB32FD39D4B2285B" blockId="3.[264,1324,603,1870]" pageId="3" pageNumber="4">
|
||
<emphasis id="C6F8AA61B27BFFC3FB32FD39D69B29D3" bold="true" box="[312,442,644,670]" pageId="3" pageNumber="4">Diagnosis:</emphasis>
|
||
<taxonomicName id="338C0DF0B27BFFC3FBC6FD39D56729D3" box="[460,582,644,670]" class="Bivalvia" family="Pectinidae" kingdom="Animalia" order="Pectinoida" pageId="3" pageNumber="4" phylum="Mollusca" rank="family">Pectinidae</taxonomicName>
|
||
deprived of radiate ornamentation, byssal notch without ctenolium, posterior auricles not delimited. Right valve showing a prismatic juvenile stage. Postprismatic part of this valve and left valve sculptured by commarginal ridges or lamellae affecting only the external surface of the shell.
|
||
</paragraph>
|
||
<paragraph id="F4337673B27BFFC3FB32FC99D40C2873" blockId="3.[264,1324,603,1870]" box="[312,813,804,830]" pageId="3" pageNumber="4">
|
||
<emphasis id="C6F8AA61B27BFFC3FB32FC99D6FF2873" bold="true" box="[312,478,804,830]" pageId="3" pageNumber="4">Monospecific</emphasis>
|
||
:
|
||
<taxonomicName id="338C0DF0B27BFFC3FBE7FC99D5C62870" box="[493,743,804,829]" class="Bivalvia" family="Pectinidae" genus="Sinepecten" kingdom="Animalia" order="Pectinoida" pageId="3" pageNumber="4" phylum="Mollusca" rank="species" species="segonzaci" status="sp. nov.">
|
||
<emphasis id="C6F8AA61B27BFFC3FBE7FC99D5C62870" box="[493,743,804,829]" italics="true" pageId="3" pageNumber="4">Sinepecten segonzaci</emphasis>
|
||
</taxonomicName>
|
||
<taxonomicNameLabel id="DDCB171AB27BFFC3F8E4FC99D40C2873" box="[750,813,804,830]" pageId="3" pageNumber="4" rank="species">n. sp.</taxonomicNameLabel>
|
||
</paragraph>
|
||
</subSubSection>
|
||
<subSubSection id="BC9625F8B27BFFC4FB32FCF1D4B428C3" lastPageId="4" lastPageNumber="5" pageId="3" pageNumber="4" type="discussion">
|
||
<paragraph id="F4337673B27BFFC4FB32FCF1D239298B" blockId="3.[264,1324,603,1870]" lastBlockId="4.[264,1324,284,910]" lastPageId="4" lastPageNumber="5" pageId="3" pageNumber="4">
|
||
<emphasis id="C6F8AA61B27BFFC3FB32FCF1D68B282B" bold="true" box="[312,426,844,870]" pageId="3" pageNumber="4">Remarks</emphasis>
|
||
: Within the subfamily Propeamussiinae,
|
||
<taxonomicName id="338C0DF0B27BFFC3F99EFCF1D3042828" box="[916,1061,844,869]" class="Bivalvia" family="Propeamussiidae" genus="Bathypecten" higherTaxonomySource="CoL" kingdom="Animalia" order="Pectinida" pageId="3" pageNumber="4" phylum="Mollusca" rank="genus">
|
||
<emphasis id="C6F8AA61B27BFFC3F99EFCF1D3042828" box="[916,1061,844,869]" italics="true" pageId="3" pageNumber="4">Bathypecten</emphasis>
|
||
</taxonomicName>
|
||
and
|
||
<taxonomicName id="338C0DF0B27BFFC3FE6AFCF1D3DC2828" box="[1120,1277,844,869]" class="Bivalvia" family="Propeamussiidae" genus="Catillopecten" kingdom="Animalia" order="Pectinoida" pageId="3" pageNumber="4" phylum="Mollusca" rank="genus">
|
||
<emphasis id="C6F8AA61B27BFFC3FE6AFCF1D3DC2828" box="[1120,1277,844,869]" italics="true" pageId="3" pageNumber="4">Catillopecten</emphasis>
|
||
</taxonomicName>
|
||
are the genera having the strongest affinities with
|
||
<taxonomicName id="338C0DF0B27BFFC3F928FCC9D48028C0" box="[802,929,884,909]" class="Bivalvia" family="Pectinidae" genus="Sinepecten" kingdom="Animalia" order="Pectinoida" pageId="3" pageNumber="4" phylum="Mollusca" rank="genus">
|
||
<emphasis id="C6F8AA61B27BFFC3F928FCC9D48028C0" box="[802,929,884,909]" italics="true" pageId="3" pageNumber="4">Sinepecten</emphasis>
|
||
</taxonomicName>
|
||
. All three genera have a juvenilelike, general shell morphology, recalling some paleozoic fossils to mind (
|
||
<bibRefCitation id="901D0B82B27BFFC3FE8EFC21D6672893" author="Schein-Fatton" pageId="3" pageNumber="27" refString="Schein-Fatton E. (1988) Un Pectinacea (Bivalvia) tres primitif: Bathypecten vulcani, du site hydrothermal de 13 ° N (Pacifique oriental). Oceanologica Acta, volume special 8, 83 - 98." type="journal article" year="1988">ScheinFatton 1988</bibRefCitation>
|
||
), e.g.,
|
||
<taxonomicName id="338C0DF0B27BFFC3FB9DFC79D40E2893" authority="Hall, 1883" authorityName="Hall" authorityYear="1883" box="[407,815,964,990]" class="Bivalvia" family="Pterinopectinidae" genus="Pterinopecten" higherTaxonomySource="GBIF" kingdom="Animalia" order="Pterioida" pageId="3" pageNumber="4" phylum="Mollusca" rank="species" species="undosus">
|
||
<emphasis id="C6F8AA61B27BFFC3FB9DFC79D5842890" box="[407,677,964,989]" italics="true" pageId="3" pageNumber="4">Pterinopecten undosus</emphasis>
|
||
Hall, 1883
|
||
</taxonomicName>
|
||
. The following characters are found in the postlarval shells of all
|
||
<taxonomicName id="338C0DF0B27BFFC3F837FC51D59D2F4B" box="[573,700,1004,1030]" class="Bivalvia" family="Pectinidae" kingdom="Animalia" order="Pectinoida" pageId="3" pageNumber="4" phylum="Mollusca" rank="family">Pectinidae</taxonomicName>
|
||
: byssate, thin test with low convexity, no radial ornamentation, flat right valve without ctenolium, and posterior auricles poorly delimited. The arrangement of prisms of their right valve is commarginal in the three genera, as in most Propeamussiinae. Besides their resemblance, there are differences principally in the duration of the prismatic stage and in ornamentation. The outer prismatic microstructure of the right valve persists throughout ontogeny in
|
||
<taxonomicName id="338C0DF0B27BFFC3F933FB09D4EB2F80" box="[825,970,1204,1229]" class="Bivalvia" family="Propeamussiidae" genus="Bathypecten" higherTaxonomySource="CoL" kingdom="Animalia" order="Pectinida" pageId="3" pageNumber="4" phylum="Mollusca" rank="genus">
|
||
<emphasis id="C6F8AA61B27BFFC3F933FB09D4EB2F80" box="[825,970,1204,1229]" italics="true" pageId="3" pageNumber="4">Bathypecten</emphasis>
|
||
</taxonomicName>
|
||
and
|
||
<taxonomicName id="338C0DF0B27BFFC3FE0EFB09D3832F80" box="[1028,1186,1204,1229]" class="Bivalvia" family="Propeamussiidae" genus="Catillopecten" kingdom="Animalia" order="Pectinoida" pageId="3" pageNumber="4" phylum="Mollusca" rank="genus">
|
||
<emphasis id="C6F8AA61B27BFFC3FE0EFB09D3832F80" box="[1028,1186,1204,1229]" italics="true" pageId="3" pageNumber="4">Catillopecten</emphasis>
|
||
</taxonomicName>
|
||
, whereas it is restricted to a juvenile stage in
|
||
<taxonomicName id="338C0DF0B27BFFC3F8C8FB61D4602FB8" box="[706,833,1244,1269]" class="Bivalvia" family="Pectinidae" genus="Sinepecten" kingdom="Animalia" order="Pectinoida" pageId="3" pageNumber="4" phylum="Mollusca" rank="genus">
|
||
<emphasis id="C6F8AA61B27BFFC3F8C8FB61D4602FB8" box="[706,833,1244,1269]" italics="true" pageId="3" pageNumber="4">Sinepecten</emphasis>
|
||
</taxonomicName>
|
||
. The ornamentation of the adult shell, although exclusively commarginal in the three genera, is very different from one to the other. In
|
||
<taxonomicName id="338C0DF0B27BFFC3FB7EFA91D5242E08" box="[372,517,1324,1349]" class="Bivalvia" family="Propeamussiidae" genus="Bathypecten" higherTaxonomySource="CoL" kingdom="Animalia" order="Pectinida" pageId="3" pageNumber="4" phylum="Mollusca" rank="genus">
|
||
<emphasis id="C6F8AA61B27BFFC3FB7EFA91D5242E08" box="[372,517,1324,1349]" italics="true" pageId="3" pageNumber="4">Bathypecten</emphasis>
|
||
</taxonomicName>
|
||
, the presence of ornamentation can even be questioned, as the shell is not sculptured, but has only commarginal shallow undulations that tend to disappear through ontogeny (
|
||
<bibRefCitation id="901D0B82B27BFFC3FBE3FAC1D5F52EDB" author="Schein-Fatton" box="[489,724,1404,1430]" pageId="3" pageNumber="26" refString="Schein-Fatton E. (1985) Decouverte sur la ride du Pacifique oriental a 13 ° N d'un Pectinidae (Bivalvia, Pteromorphia) d'affinites paleozoiques. Comptes Rendus de l'Academie des Sciences Paris, 301, serie III, 491 - 496." type="journal article" year="1985">ScheinFatton 1985</bibRefCitation>
|
||
) and can even be absent (
|
||
<bibRefCitation id="901D0B82B27BFFC3FE02FAC1D23E2EDB" author="Dijkstra" box="[1032,1311,1404,1430]" pageId="3" pageNumber="25" refString="Dijkstra H. & Gofas S. (2004) Pectinoidea (Bivalvia: Propeamussiidae and Pectinidae) from some northeastern Atlantic seamounts. Sarsia, North Atlantic Marine Science, 89, 33 - 78." type="journal article" year="2004">Dijkstra & Gofas 2004</bibRefCitation>
|
||
). In contrast,
|
||
<taxonomicName id="338C0DF0B27BFFC3FB96FA19D51B2EF0" box="[412,570,1444,1469]" class="Bivalvia" family="Propeamussiidae" genus="Catillopecten" kingdom="Animalia" order="Pectinoida" pageId="3" pageNumber="4" phylum="Mollusca" rank="genus">
|
||
<emphasis id="C6F8AA61B27BFFC3FB96FA19D51B2EF0" box="[412,570,1444,1469]" italics="true" pageId="3" pageNumber="4">Catillopecten</emphasis>
|
||
</taxonomicName>
|
||
and
|
||
<taxonomicName id="338C0DF0B27BFFC3F877FA19D5DD2EF0" box="[637,764,1444,1469]" class="Bivalvia" family="Pectinidae" genus="Sinepecten" kingdom="Animalia" order="Pectinoida" pageId="3" pageNumber="4" phylum="Mollusca" rank="genus">
|
||
<emphasis id="C6F8AA61B27BFFC3F877FA19D5DD2EF0" box="[637,764,1444,1469]" italics="true" pageId="3" pageNumber="4">Sinepecten</emphasis>
|
||
</taxonomicName>
|
||
show a dense external ornamentation of fine ridges. In
|
||
<taxonomicName id="338C0DF0B27BFFC3FB8BFA71D53E2EA8" box="[385,543,1484,1509]" class="Bivalvia" family="Propeamussiidae" genus="Catillopecten" kingdom="Animalia" order="Pectinoida" pageId="3" pageNumber="4" phylum="Mollusca" rank="genus">
|
||
<emphasis id="C6F8AA61B27BFFC3FB8BFA71D53E2EA8" box="[385,543,1484,1509]" italics="true" pageId="3" pageNumber="4">Catillopecten</emphasis>
|
||
</taxonomicName>
|
||
, the ridges of the left valve are sharp, even and regularly spaced. Moreover, the inner face is marked with grooves reflecting the ridges on the outer face. These ridges derive thus from narrow commarginal folds concerning the entire shell thickness. They become closer with growth, and sometimes the flanks of each narrow fold fuse so that the inner grooves disappear (unpublished data). In the prismatic right valve there is only a very faint and rather irregular commarginal fluting which derives from the commarginal array of prisms, and becomes more pronounced in the periphery where commarginal ridges begin to shape as in
|
||
<taxonomicName id="338C0DF0B27BFFC3F8E2F959D4852DB0" box="[744,932,1764,1789]" class="Bivalvia" family="Propeamussiidae" genus="Propeamussium" kingdom="Animalia" order="Pectinoida" pageId="3" pageNumber="4" phylum="Mollusca" rank="genus">
|
||
<emphasis id="C6F8AA61B27BFFC3F8E2F959D4852DB0" box="[744,932,1764,1789]" italics="true" pageId="3" pageNumber="4">Propeamussium</emphasis>
|
||
</taxonomicName>
|
||
,
|
||
<taxonomicName id="338C0DF0B27BFFC3F9B8F959D3412DB0" box="[946,1120,1764,1789]" class="Bivalvia" family="Propeamussiidae" genus="Parvamussium" kingdom="Animalia" order="Pectinoida" pageId="3" pageNumber="4" phylum="Mollusca" rank="genus">
|
||
<emphasis id="C6F8AA61B27BFFC3F9B8F959D3412DB0" box="[946,1120,1764,1789]" italics="true" pageId="3" pageNumber="4">Parvamussium</emphasis>
|
||
</taxonomicName>
|
||
and
|
||
<taxonomicName id="338C0DF0B27BFFC3FE90F959D6932C6B" authority="Schein 1989" authorityName="Schein" authorityYear="1989" class="Bivalvia" family="Propeamussiidae" genus="Cyclopecten" kingdom="Animalia" order="Pectinoida" pageId="3" pageNumber="4" phylum="Mollusca" rank="genus">
|
||
<emphasis id="C6F8AA61B27BFFC3FE90F959D20A2DB0" box="[1178,1323,1764,1789]" italics="true" pageId="3" pageNumber="4">Cyclopecten</emphasis>
|
||
(Schein 1989)
|
||
</taxonomicName>
|
||
. Furthermore concentric undulations can also be present on both valves. In
|
||
<taxonomicName id="338C0DF0B27BFFC3FB02F889D6A62C00" box="[264,391,1844,1869]" class="Bivalvia" family="Pectinidae" genus="Sinepecten" kingdom="Animalia" order="Pectinoida" pageId="3" pageNumber="4" phylum="Mollusca" rank="genus">
|
||
<emphasis id="C6F8AA61B27BFFC3FB02F889D6A62C00" box="[264,391,1844,1869]" italics="true" pageId="3" pageNumber="4">Sinepecten</emphasis>
|
||
</taxonomicName>
|
||
, after the prismatic stage, ornamentation and microstructure are the same on both valves. The ridges tend to turn to lamellae, and the inner face is not grooved. The ornamentation of
|
||
<taxonomicName id="338C0DF0B27CFFC4FBD6FEF9D55B2A10" box="[476,634,324,349]" class="Bivalvia" family="Propeamussiidae" genus="Catillopecten" kingdom="Animalia" order="Pectinoida" pageId="4" pageNumber="5" phylum="Mollusca" rank="genus">
|
||
<emphasis id="C6F8AA61B27CFFC4FBD6FEF9D55B2A10" box="[476,634,324,349]" italics="true" pageId="4" pageNumber="5">Catillopecten</emphasis>
|
||
</taxonomicName>
|
||
and
|
||
<taxonomicName id="338C0DF0B27CFFC4F8BDFEF9D4172A10" box="[695,822,324,349]" class="Bivalvia" family="Pectinidae" genus="Sinepecten" kingdom="Animalia" order="Pectinoida" pageId="4" pageNumber="5" phylum="Mollusca" rank="genus">
|
||
<emphasis id="C6F8AA61B27CFFC4F8BDFEF9D4172A10" box="[695,822,324,349]" italics="true" pageId="4" pageNumber="5">Sinepecten</emphasis>
|
||
</taxonomicName>
|
||
could be homologous if the ridges derive from narrow folds in both genera, but the absence of grooves on the inner shell face of juvenile and adult
|
||
<taxonomicName id="338C0DF0B27CFFC4FBEBFE29D5412AE0" box="[481,608,404,429]" class="Bivalvia" family="Pectinidae" genus="Sinepecten" kingdom="Animalia" order="Pectinoida" pageId="4" pageNumber="5" phylum="Mollusca" rank="genus">
|
||
<emphasis id="C6F8AA61B27CFFC4FBEBFE29D5412AE0" box="[481,608,404,429]" italics="true" pageId="4" pageNumber="5">Sinepecten</emphasis>
|
||
</taxonomicName>
|
||
suggests a different origin. In the present state of knowledge (
|
||
<tableCitation id="B90E43C8B27CFFC4FB1AFE01D64E2A9B" box="[272,367,444,470]" captionStart="TABLE 1" captionStartId="4.[264,352,953,977]" captionTargetBox="[264,1293,1078,1803]" captionTargetPageId="4" captionText="TABLE 1. Comparison between the genera Bathypecten, Catillopecten and Sinepecten. The characters common to any two genera are in italic type to emphasize the gradient from Bathypecten to Sinepecten, and the intermediate place of Catillopecten." httpUri="http://table.plazi.org/id/A0F326FBB27CFFC4FB02FC04D4562F58" pageId="4" pageNumber="5" tableUuid="A0F326FBB27CFFC4FB02FC04D4562F58">Table 1</tableCitation>
|
||
), adult
|
||
<taxonomicName id="338C0DF0B27CFFC4FBD6FE01D57A2A98" box="[476,603,444,469]" class="Bivalvia" family="Pectinidae" genus="Sinepecten" kingdom="Animalia" order="Pectinoida" pageId="4" pageNumber="5" phylum="Mollusca" rank="genus">
|
||
<emphasis id="C6F8AA61B27CFFC4FBD6FE01D57A2A98" box="[476,603,444,469]" italics="true" pageId="4" pageNumber="5">Sinepecten</emphasis>
|
||
</taxonomicName>
|
||
is clearly different from
|
||
<taxonomicName id="338C0DF0B27CFFC4F9A1FE01D31D2A98" box="[939,1084,444,469]" class="Bivalvia" family="Propeamussiidae" genus="Bathypecten" higherTaxonomySource="CoL" kingdom="Animalia" order="Pectinida" pageId="4" pageNumber="5" phylum="Mollusca" rank="genus">
|
||
<emphasis id="C6F8AA61B27CFFC4F9A1FE01D31D2A98" box="[939,1084,444,469]" italics="true" pageId="4" pageNumber="5">Bathypecten</emphasis>
|
||
</taxonomicName>
|
||
and
|
||
<taxonomicName id="338C0DF0B27CFFC4FE8FFE01D2022A98" box="[1157,1315,444,469]" class="Bivalvia" family="Propeamussiidae" genus="Catillopecten" kingdom="Animalia" order="Pectinoida" pageId="4" pageNumber="5" phylum="Mollusca" rank="genus">
|
||
<emphasis id="C6F8AA61B27CFFC4FE8FFE01D2022A98" box="[1157,1315,444,469]" italics="true" pageId="4" pageNumber="5">Catillopecten</emphasis>
|
||
</taxonomicName>
|
||
, therefore justifying the creation of a new genus. Despite the synonymy of
|
||
<taxonomicName id="338C0DF0B27CFFC4FE62FE59D3D82AB0" box="[1128,1273,484,509]" class="Bivalvia" family="Propeamussiidae" genus="Bathypecten" higherTaxonomySource="CoL" kingdom="Animalia" order="Pectinida" pageId="4" pageNumber="5" phylum="Mollusca" rank="genus">
|
||
<emphasis id="C6F8AA61B27CFFC4FE62FE59D3D82AB0" box="[1128,1273,484,509]" italics="true" pageId="4" pageNumber="5">Bathypecten</emphasis>
|
||
</taxonomicName>
|
||
and
|
||
<taxonomicName id="338C0DF0B27CFFC4FB02FDB1D6872968" box="[264,422,524,549]" class="Bivalvia" family="Propeamussiidae" genus="Catillopecten" kingdom="Animalia" order="Pectinoida" pageId="4" pageNumber="5" phylum="Mollusca" rank="genus">
|
||
<emphasis id="C6F8AA61B27CFFC4FB02FDB1D6872968" box="[264,422,524,549]" italics="true" pageId="4" pageNumber="5">Catillopecten</emphasis>
|
||
</taxonomicName>
|
||
recently proposed without ontogenetic argumentation (
|
||
<bibRefCitation id="901D0B82B27CFFC4FE5EFDB1D6662903" author="Dijkstra" pageId="4" pageNumber="25" refString="Dijkstra H. & Gofas S. (2004) Pectinoidea (Bivalvia: Propeamussiidae and Pectinidae) from some northeastern Atlantic seamounts. Sarsia, North Atlantic Marine Science, 89, 33 - 78." type="journal article" year="2004">Dijkstra & Gofas 2004</bibRefCitation>
|
||
), I consider that the present study confirms the validity of the three genera (see also the discussion below, following the description of
|
||
<taxonomicName id="338C0DF0B27CFFC4F965FDE1D3222938" box="[879,1027,604,629]" class="Bivalvia" family="Pectinidae" genus="Sinepecten" kingdom="Animalia" order="Pectinoida" pageId="4" pageNumber="5" phylum="Mollusca" rank="species" species="segonzaci">
|
||
<emphasis id="C6F8AA61B27CFFC4F965FDE1D3222938" box="[879,1027,604,629]" italics="true" pageId="4" pageNumber="5">S. segonzaci</emphasis>
|
||
</taxonomicName>
|
||
). Irregular commarginal undulations tending to disappear after the early ontogeny as in
|
||
<taxonomicName id="338C0DF0B27CFFC4F9E6FD39D35C29D0" box="[1004,1149,644,669]" class="Bivalvia" family="Propeamussiidae" genus="Bathypecten" higherTaxonomySource="CoL" kingdom="Animalia" order="Pectinida" pageId="4" pageNumber="5" phylum="Mollusca" rank="genus">
|
||
<emphasis id="C6F8AA61B27CFFC4F9E6FD39D35C29D0" box="[1004,1149,644,669]" italics="true" pageId="4" pageNumber="5">Bathypecten</emphasis>
|
||
</taxonomicName>
|
||
are typically a plesiomorphic character, common to different taxa in the
|
||
<taxonomicName id="338C0DF0B27CFFC4F9A3FD11D302298B" box="[937,1059,684,710]" class="Bivalvia" family="Pectinidae" kingdom="Animalia" order="Pectinoida" pageId="4" pageNumber="5" phylum="Mollusca" rank="family">Pectinidae</taxonomicName>
|
||
(symplesiomorphy).
|
||
</paragraph>
|
||
<paragraph id="F4337673B27CFFC4FB32FD69D4B428C3" blockId="4.[264,1324,284,910]" pageId="4" pageNumber="5">
|
||
In contrast, closeset sharp ridges keeping regularly spaced throughout ontogeny constitute a derived character which separates clearly
|
||
<taxonomicName id="338C0DF0B27CFFC4F9A9FD41D3602858" box="[931,1089,764,789]" class="Bivalvia" family="Propeamussiidae" genus="Catillopecten" kingdom="Animalia" order="Pectinoida" pageId="4" pageNumber="5" phylum="Mollusca" rank="genus">
|
||
<emphasis id="C6F8AA61B27CFFC4F9A9FD41D3602858" box="[931,1089,764,789]" italics="true" pageId="4" pageNumber="5">Catillopecten</emphasis>
|
||
</taxonomicName>
|
||
from
|
||
<taxonomicName id="338C0DF0B27CFFC4FE98FD41D2022858" box="[1170,1315,764,789]" class="Bivalvia" family="Propeamussiidae" genus="Bathypecten" higherTaxonomySource="CoL" kingdom="Animalia" order="Pectinida" pageId="4" pageNumber="5" phylum="Mollusca" rank="genus">
|
||
<emphasis id="C6F8AA61B27CFFC4FE98FD41D2022858" box="[1170,1315,764,789]" italics="true" pageId="4" pageNumber="5">Bathypecten</emphasis>
|
||
</taxonomicName>
|
||
. Moreover, ornamentation features restricted to the outer shell surface, which vary at the species level, must be distinguished from structures concerning the entire shell thickness like the typical narrow folds of the genus
|
||
<taxonomicName id="338C0DF0B27CFFC4F8FAFCC9D4AF28C0" box="[752,910,884,909]" class="Bivalvia" family="Propeamussiidae" genus="Catillopecten" kingdom="Animalia" order="Pectinoida" pageId="4" pageNumber="5" phylum="Mollusca" rank="genus">
|
||
<emphasis id="C6F8AA61B27CFFC4F8FAFCC9D4AF28C0" box="[752,910,884,909]" italics="true" pageId="4" pageNumber="5">Catillopecten</emphasis>
|
||
</taxonomicName>
|
||
.
|
||
</paragraph>
|
||
</subSubSection>
|
||
<caption id="A0F326FBB27CFFC4FB02FC04D4562F58" ID-Table-UUID="A0F326FBB27CFFC4FB02FC04D4562F58" httpUri="http://table.plazi.org/id/A0F326FBB27CFFC4FB02FC04D4562F58" pageId="4" pageNumber="5" targetBox="[264,1293,1078,1803]" targetIsTable="true" targetPageId="4">
|
||
<paragraph id="F4337673B27CFFC4FB02FC04D4562F58" blockId="4.[264,1323,953,1046]" pageId="4" pageNumber="5">
|
||
<emphasis id="C6F8AA61B27CFFC4FB02FC04D6A3289C" bold="true" box="[264,386,953,977]" pageId="4" pageNumber="5">TABLE 1.</emphasis>
|
||
Comparison between the genera
|
||
<taxonomicName id="338C0DF0B27CFFC4F907FC07D4B0289C" box="[781,913,954,977]" class="Bivalvia" family="Propeamussiidae" genus="Bathypecten" higherTaxonomySource="CoL" kingdom="Animalia" order="Pectinida" pageId="4" pageNumber="5" phylum="Mollusca" rank="genus">
|
||
<emphasis id="C6F8AA61B27CFFC4F907FC07D4B0289C" box="[781,913,954,977]" italics="true" pageId="4" pageNumber="5">Bathypecten</emphasis>
|
||
</taxonomicName>
|
||
,
|
||
<taxonomicName id="338C0DF0B27CFFC4F9ACFC07D317289C" box="[934,1078,954,977]" class="Bivalvia" family="Propeamussiidae" genus="Catillopecten" kingdom="Animalia" order="Pectinoida" pageId="4" pageNumber="5" phylum="Mollusca" rank="genus">
|
||
<emphasis id="C6F8AA61B27CFFC4F9ACFC07D317289C" box="[934,1078,954,977]" italics="true" pageId="4" pageNumber="5">Catillopecten</emphasis>
|
||
</taxonomicName>
|
||
and
|
||
<taxonomicName id="338C0DF0B27CFFC4FE73FC07D3CD289C" box="[1145,1260,954,977]" class="Bivalvia" family="Pectinidae" genus="Sinepecten" kingdom="Animalia" order="Pectinoida" pageId="4" pageNumber="5" phylum="Mollusca" rank="genus">
|
||
<emphasis id="C6F8AA61B27CFFC4FE73FC07D3CD289C" box="[1145,1260,954,977]" italics="true" pageId="4" pageNumber="5">Sinepecten</emphasis>
|
||
</taxonomicName>
|
||
. The characters common to any two genera are in italic type to emphasize the gradient from
|
||
<taxonomicName id="338C0DF0B27CFFC4FEADFC61D20A28BE" box="[1191,1323,988,1011]" class="Bivalvia" family="Propeamussiidae" genus="Bathypecten" higherTaxonomySource="CoL" kingdom="Animalia" order="Pectinida" pageId="4" pageNumber="5" phylum="Mollusca" rank="genus">
|
||
<emphasis id="C6F8AA61B27CFFC4FEADFC61D20A28BE" box="[1191,1323,988,1011]" italics="true" pageId="4" pageNumber="5">Bathypecten</emphasis>
|
||
</taxonomicName>
|
||
to
|
||
<taxonomicName id="338C0DF0B27CFFC4FB2EFC42D6B62F5B" box="[292,407,1023,1046]" class="Bivalvia" family="Pectinidae" genus="Sinepecten" kingdom="Animalia" order="Pectinoida" pageId="4" pageNumber="5" phylum="Mollusca" rank="genus">
|
||
<emphasis id="C6F8AA61B27CFFC4FB2EFC42D6B62F5B" box="[292,407,1023,1046]" italics="true" pageId="4" pageNumber="5">Sinepecten</emphasis>
|
||
</taxonomicName>
|
||
, and the intermediate place of
|
||
<taxonomicName id="338C0DF0B27CFFC4F8EAFC42D4512F5B" box="[736,880,1023,1046]" class="Bivalvia" family="Propeamussiidae" genus="Catillopecten" kingdom="Animalia" order="Pectinoida" pageId="4" pageNumber="5" phylum="Mollusca" rank="genus">
|
||
<emphasis id="C6F8AA61B27CFFC4F8EAFC42D4512F5B" box="[736,880,1023,1046]" italics="true" pageId="4" pageNumber="5">Catillopecten</emphasis>
|
||
</taxonomicName>
|
||
.
|
||
</paragraph>
|
||
</caption>
|
||
<paragraph id="F4337673B27CFFC4FB8BFB8BD6C52C46" pageId="4" pageNumber="5">
|
||
<table id="868C84D3B27C003FFB02FB8BD22C2C46" box="[264,1293,1078,1803]" gridcols="3" gridrows="7" pageId="4" pageNumber="5">
|
||
<tr id="4ABC7431B27C003FFB02FB8BD22C2F3C" box="[264,1293,1078,1137]" gridrow="0" pageId="4" pageNumber="5">
|
||
<th id="096D1D4DB27C003FFB02FB8BD5CC2F3C" box="[264,749,1078,1137]" gridcol="0" gridrow="0" pageId="4" pageNumber="5">
|
||
<emphasis id="C6F8AA61B27CFFC4FB8BFB8BD6AE2F3C" bold="true" pageId="4" pageNumber="5">
|
||
Genus
|
||
<taxonomicName id="338C0DF0B27CFFC4F85BFB8BD6AE2F3C" authority="Characters" authorityName="Characters" class="Bivalvia" family="Propeamussiidae" genus="Bathypecten" higherTaxonomySource="CoL" kingdom="Animalia" order="Pectinida" pageId="4" pageNumber="5" phylum="Mollusca" rank="genus">
|
||
<emphasis id="C6F8AA61B27CFFC4F85BFB8BD5F82F03" bold="true" box="[593,729,1078,1102]" italics="true" pageId="4" pageNumber="5">Bathypecten</emphasis>
|
||
Characters
|
||
</taxonomicName>
|
||
</emphasis>
|
||
</th>
|
||
<th id="096D1D4DB27C003FF918FB8BD3302F3C" box="[786,1041,1078,1137]" gridcol="1" gridrow="0" pageId="4" pageNumber="5">
|
||
<taxonomicName id="338C0DF0B27CFFC4F918FB8BD4822F03" box="[786,931,1078,1102]" class="Bivalvia" family="Propeamussiidae" genus="Catillopecten" kingdom="Animalia" order="Pectinoida" pageId="4" pageNumber="5" phylum="Mollusca" rank="genus">
|
||
<emphasis id="C6F8AA61B27CFFC4F918FB8BD4822F03" bold="true" box="[786,931,1078,1102]" italics="true" pageId="4" pageNumber="5">Catillopecten</emphasis>
|
||
</taxonomicName>
|
||
</th>
|
||
<th id="096D1D4DB27C003FFE2FFB8BD22C2F3C" box="[1061,1293,1078,1137]" gridcol="2" gridrow="0" pageId="4" pageNumber="5">
|
||
<taxonomicName id="338C0DF0B27CFFC4FE2FFB8BD3BC2F03" box="[1061,1181,1078,1102]" class="Bivalvia" family="Pectinidae" genus="Sinepecten" kingdom="Animalia" order="Pectinoida" pageId="4" pageNumber="5" phylum="Mollusca" rank="genus">
|
||
<emphasis id="C6F8AA61B27CFFC4FE2FFB8BD3BC2F03" bold="true" box="[1061,1181,1078,1102]" italics="true" pageId="4" pageNumber="5">Sinepecten</emphasis>
|
||
</taxonomicName>
|
||
</th>
|
||
</tr>
|
||
<tr id="4ABC7431B27C003FFB02FB3ED22C2FF3" box="[264,1293,1155,1214]" gridrow="1" pageId="4" pageNumber="5">
|
||
<th id="096D1D4DB27C003FFB02FB3ED5CC2FF3" box="[264,749,1155,1214]" gridcol="0" gridrow="1" pageId="4" pageNumber="5">
|
||
<emphasis id="C6F8AA61B27CFFC4FB1AFB3ED69D2FD6" bold="true" box="[272,444,1155,1179]" pageId="4" pageNumber="5">prismatic stage</emphasis>
|
||
<emphasis id="C6F8AA61B27CFFC4F85BFB39D5E72FD6" box="[593,710,1156,1179]" italics="true" pageId="4" pageNumber="5">throughout</emphasis>
|
||
<emphasis id="C6F8AA61B27CFFC4FB1AFB1BD68C2FF3" bold="true" box="[272,429,1190,1214]" pageId="4" pageNumber="5">on right valve</emphasis>
|
||
<emphasis id="C6F8AA61B27CFFC4F85BFB1AD5932FF3" box="[593,690,1191,1214]" italics="true" pageId="4" pageNumber="5">ontogeny</emphasis>
|
||
</th>
|
||
<td id="096D1D4DB27C003FF918FB3ED3302FF3" box="[786,1041,1155,1214]" gridcol="1" gridrow="1" pageId="4" pageNumber="5">
|
||
<emphasis id="C6F8AA61B27CFFC4F918FB39D4D12FD6" box="[786,1008,1156,1179]" italics="true" pageId="4" pageNumber="5">throughout ontogeny</emphasis>
|
||
</td>
|
||
<td id="096D1D4DB27C003FFE2FFB3ED22C2FF3" box="[1061,1293,1155,1214]" gridcol="2" gridrow="1" pageId="4" pageNumber="5">restricted to early ontogeny</td>
|
||
</tr>
|
||
<tr id="4ABC7431B27C003FFB02FB6CD22C2E63" box="[264,1293,1233,1326]" gridrow="2" pageId="4" pageNumber="5">
|
||
<th id="096D1D4DB27C003FFB02FB6CD5CC2E63" box="[264,749,1233,1326]" gridcol="0" gridrow="2" pageId="4" pageNumber="5">
|
||
<emphasis id="C6F8AA61B27CFFC4FB1AFB6CD6D92FA4" bold="true" box="[272,504,1233,1257]" pageId="4" pageNumber="5">commarginal fluting</emphasis>
|
||
absent or less
|
||
<emphasis id="C6F8AA61B27CFFC4FB1AFB4ED6D62E46" bold="true" box="[272,503,1267,1291]" pageId="4" pageNumber="5">derived from prisms</emphasis>
|
||
marked in
|
||
<emphasis id="C6F8AA61B27CFFC4FB1AFAABD68D2E63" bold="true" box="[272,428,1302,1326]" pageId="4" pageNumber="5">on right valve</emphasis>
|
||
periphery
|
||
</th>
|
||
<td id="096D1D4DB27C003FF918FB6CD3302E63" box="[786,1041,1233,1326]" gridcol="1" gridrow="2" pageId="4" pageNumber="5">more marked in periphery</td>
|
||
<td id="096D1D4DB27C003FFE2FFB6CD22C2E63" box="[1061,1293,1233,1326]" gridcol="2" gridrow="2" pageId="4" pageNumber="5">restricted to prismatic stage</td>
|
||
</tr>
|
||
<tr id="4ABC7431B27C003FFB02FAFCD22C2ED3" box="[264,1293,1345,1438]" gridrow="3" pageId="4" pageNumber="5">
|
||
<th id="096D1D4DB27C003FFB02FAFCD5CC2ED3" box="[264,749,1345,1438]" gridcol="0" gridrow="3" pageId="4" pageNumber="5">
|
||
<emphasis id="C6F8AA61B27CFFC4FB1AFAFCD6992E14" bold="true" box="[272,440,1345,1369]" pageId="4" pageNumber="5">ornamentation</emphasis>
|
||
<emphasis id="C6F8AA61B27CFFC4F85BFAFFD5B62E14" box="[593,663,1346,1369]" italics="true" pageId="4" pageNumber="5">absent</emphasis>
|
||
<emphasis id="C6F8AA61B27CFFC4FB1AFADED67C2ED3" bold="true" pageId="4" pageNumber="5">on right valve outside prisms</emphasis>
|
||
</th>
|
||
<td id="096D1D4DB27C003FF918FAFCD3302ED3" box="[786,1041,1345,1438]" gridcol="1" gridrow="3" pageId="4" pageNumber="5">
|
||
<emphasis id="C6F8AA61B27CFFC4F918FAFFD4792E14" box="[786,856,1346,1369]" italics="true" pageId="4" pageNumber="5">absent</emphasis>
|
||
</td>
|
||
<td id="096D1D4DB27C003FFE2FFAFCD22C2ED3" box="[1061,1293,1345,1438]" gridcol="2" gridrow="3" pageId="4" pageNumber="5">regular commarginal ridges or lamellae</td>
|
||
</tr>
|
||
<tr id="4ABC7431B27C003FFB02FA0CD22C2D43" box="[264,1293,1457,1550]" gridrow="4" pageId="4" pageNumber="5">
|
||
<th id="096D1D4DB27C003FFB02FA0CD5CC2D43" box="[264,749,1457,1550]" gridcol="0" gridrow="4" pageId="4" pageNumber="5">
|
||
<emphasis id="C6F8AA61B27CFFC4FB1AFA0CD6862E84" bold="true" box="[272,423,1457,1481]" pageId="4" pageNumber="5">commarginal</emphasis>
|
||
<emphasis id="C6F8AA61B27CFFC4F85BFA0FD5CC2E84" box="[593,749,1458,1481]" italics="true" pageId="4" pageNumber="5">undulations or</emphasis>
|
||
<emphasis id="C6F8AA61B27CFFC4FB1AFA6ED6F62EA6" bold="true" box="[272,471,1491,1515]" pageId="4" pageNumber="5">folds on left valve</emphasis>
|
||
<emphasis id="C6F8AA61B27CFFC4F85BFA69D5522EA6" box="[593,627,1492,1515]" italics="true" pageId="4" pageNumber="5">not</emphasis>
|
||
</th>
|
||
<td id="096D1D4DB27C003FF918FA0CD3302D43" box="[786,1041,1457,1550]" gridcol="1" gridrow="4" pageId="4" pageNumber="5">
|
||
closeset regular narrow folds in juvenile at least, plus
|
||
<emphasis id="C6F8AA61B27CFFC4F94FFA4AD32B2D43" box="[837,1034,1527,1550]" italics="true" pageId="4" pageNumber="5">undulations or not</emphasis>
|
||
</td>
|
||
<td id="096D1D4DB27C003FFE2FFA0CD22C2D43" box="[1061,1293,1457,1550]" gridcol="2" gridrow="4" pageId="4" pageNumber="5">absent</td>
|
||
</tr>
|
||
<tr id="4ABC7431B27C003FFB02F99CD22C2D30" box="[264,1293,1569,1661]" gridrow="5" pageId="4" pageNumber="5">
|
||
<th id="096D1D4DB27C003FFB02F99CD5CC2D30" box="[264,749,1569,1661]" gridcol="0" gridrow="5" pageId="4" pageNumber="5">
|
||
<emphasis id="C6F8AA61B27CFFC4FB1AF99CD6992D74" bold="true" box="[272,440,1569,1593]" pageId="4" pageNumber="5">ornamentation</emphasis>
|
||
Absent
|
||
<emphasis id="C6F8AA61B27CFFC4FB1AF9FED6B82D16" bold="true" box="[272,409,1603,1627]" pageId="4" pageNumber="5">on left valve</emphasis>
|
||
</th>
|
||
<td id="096D1D4DB27C003FF918F99CD3302D30" box="[786,1041,1569,1661]" gridcol="1" gridrow="5" pageId="4" pageNumber="5">
|
||
<emphasis id="C6F8AA61B27CFFC4F918F99FD4F42D16" italics="true" pageId="4" pageNumber="5">regular commarginal ridges or lamellae</emphasis>
|
||
following folds distally
|
||
</td>
|
||
<td id="096D1D4DB27C003FFE2FF99CD22C2D30" box="[1061,1293,1569,1661]" gridcol="2" gridrow="5" pageId="4" pageNumber="5">
|
||
<emphasis id="C6F8AA61B27CFFC4FE2FF99FD3C82D16" italics="true" pageId="4" pageNumber="5">regular commarginal ridges or lamellae</emphasis>
|
||
throughout ontogeny
|
||
</td>
|
||
</tr>
|
||
<tr id="4ABC7431B27C003FFB02F973D22C2C46" box="[264,1293,1742,1803]" gridrow="6" pageId="4" pageNumber="5" rowspan-1="1" rowspan-2="1">
|
||
<th id="096D1D4DB27C003FFB02F973D5CC2C46" box="[264,749,1742,1803]" gridcol="0" gridrow="6" pageId="4" pageNumber="5">
|
||
<emphasis id="C6F8AA61B27CFFC4FB02F973D5732DA5" bold="true" box="[264,594,1742,1768]" pageId="4" pageNumber="5">
|
||
<taxonomicName id="338C0DF0B27CFFC4FB02F973D5292DA5" box="[264,520,1742,1768]" class="Bivalvia" family="Pectinidae" genus="Sinepecten" kingdom="Animalia" order="Pectinoida" pageId="4" pageNumber="5" phylum="Mollusca" rank="species" species="segonzaci" status="sp. nov.">
|
||
<emphasis id="C6F8AA61B27CFFC4FB02F973D5292DA5" bold="true" box="[264,520,1742,1768]" italics="true" pageId="4" pageNumber="5">Sinepecten segonzaci</emphasis>
|
||
</taxonomicName>
|
||
<taxonomicNameLabel id="DDCB171AB27CFFC4F81AF973D5732DA5" box="[528,594,1742,1768]" pageId="4" pageNumber="5" rank="species">n. sp.</taxonomicNameLabel>
|
||
</emphasis>
|
||
Figures 2–3, 4–12.
|
||
</th>
|
||
</tr>
|
||
</table>
|
||
</paragraph>
|
||
<subSubSection id="BC9625F8B27CFFC5FB02F891D6E12ACB" lastPageId="5" lastPageNumber="6" pageId="4" pageNumber="5" type="etymology">
|
||
<paragraph id="F4337673B27CFFC4FB02F891D5CB2C23" blockId="4.[264,1324,1836,1902]" pageId="4" pageNumber="5">
|
||
<emphasis id="C6F8AA61B27CFFC4FB02F891D6B82C0B" bold="true" box="[264,409,1836,1862]" pageId="4" pageNumber="5">Etymology:</emphasis>
|
||
species dedicated to Michel Segonzac (Ifremer, Centre of Brest,
|
||
<collectingCountry id="8C9B36E3B27CFFC4FE9BF891D3C72C0B" box="[1169,1254,1836,1862]" name="France" pageId="4" pageNumber="5">France</collectingCountry>
|
||
), who trusted me with the study of the material.
|
||
</paragraph>
|
||
<paragraph id="F4337673B27DFFC5FB32FEA6D6E12ACB" blockId="5.[264,1323,283,950]" pageId="5" pageNumber="6">
|
||
<emphasis id="C6F8AA61B27DFFC5FB32FEA6D6C62A78" bold="true" box="[312,487,283,309]" pageId="5" pageNumber="6">Locus typicus</emphasis>
|
||
: western Pacific, Manus backarc Basin, (north PapuaNew
|
||
<collectingCountry id="8C9B36E3B27DFFC5FEC9FEA1D23D2A7B" box="[1219,1308,284,310]" name="Guinea-Bissau" pageId="5" pageNumber="6">Guinea</collectingCountry>
|
||
), hydrothermal vent area PACMANUS, Field E, Barnacle site,
|
||
<geoCoordinate id="91B810B4B27DFFC5F9E6FEF9D3512A13" box="[1004,1136,324,350]" direction="south" orientation="latitude" pageId="5" pageNumber="6" precision="9" value="-3.727">03°43.62’S</geoCoordinate>
|
||
–
|
||
<geoCoordinate id="91B810B4B27DFFC5FE98FEF9D2072A13" box="[1170,1318,324,350]" direction="east" orientation="longitude" pageId="5" pageNumber="6" precision="9" value="151.672">151°40.32'E</geoCoordinate>
|
||
, depth:
|
||
<quantity id="3374DB96B27DFFC5FB6AFED1D69A2ACB" box="[352,443,364,390]" metricMagnitude="3" metricUnit="m" metricValue="1.674" pageId="5" pageNumber="6" unit="m" value="1674.0">1674 m</quantity>
|
||
.
|
||
</paragraph>
|
||
</subSubSection>
|
||
<subSubSection id="BC9625F8B27DFFC5FB32FE2ED6D9293B" pageId="5" pageNumber="6" type="materials_examined">
|
||
<paragraph id="F4337673B27DFFC5FB32FE2ED6D9293B" blockId="5.[264,1323,283,950]" pageId="5" pageNumber="6">
|
||
<emphasis id="C6F8AA61B27DFFC5FB32FE2ED6CF2AE0" bold="true" box="[312,494,403,429]" pageId="5" pageNumber="6">
|
||
<typeStatus id="2B37C8D1B27DFFC5FB32FE2ED6522AE0" box="[312,371,403,429]" pageId="5" pageNumber="6">Type</typeStatus>
|
||
material:
|
||
</emphasis>
|
||
<typeStatus id="2B37C8D1B27DFFC5FBFDFE29D5102AE3" box="[503,561,404,430]" pageId="5" pageNumber="6">Type</typeStatus>
|
||
series consisting of five bivalve specimens (specimens 2 to 6) of increasing size, from
|
||
<quantity id="3374DB96B27DFFC5F802FE01D5892A9B" box="[520,680,444,470]" metricMagnitude="-2" metricUnit="m" metricValue="1.525" metricValueMax="2.7" metricValueMin="0.35" pageId="5" pageNumber="6" unit="mm" value="15.25" valueMax="27.0" valueMin="3.5">3.5 to 27 mm</quantity>
|
||
of UPD (
|
||
<tableCitation id="B90E43C8B27DFFC5F917FE01D4582A9B" box="[797,889,444,470]" captionStart="TABLE 2" captionStartId="5.[264,352,1003,1027]" captionTargetBox="[272,1259,1099,1379]" captionTargetPageId="5" captionText="TABLE 2. Measurements (mm) of the main shell parameters of Sinepecten segonzaci. (see Figure 3 for abbreviations)." httpUri="http://table.plazi.org/id/A0F326FBB27DFFC5FB02FC56D6EF2F67" pageId="5" pageNumber="6" tableUuid="A0F326FBB27DFFC5FB02FC56D6EF2F67">Table 2</tableCitation>
|
||
), the largest one (specimen 6) being designated as the
|
||
<typeStatus id="2B37C8D1B27DFFC5FBDFFE59D51E2AB3" box="[469,575,484,510]" pageId="5" pageNumber="6" type="holotype">holotype</typeStatus>
|
||
. It is catalogued in the National Science Museum of Tokyo with the following registration numbers: NSMTMo 73697 (
|
||
<typeStatus id="2B37C8D1B27DFFC5F9CFFDB1D310296B" box="[965,1073,524,550]" pageId="5" pageNumber="6" type="holotype">holotype</typeStatus>
|
||
), NSMTMo 73698 (specimen 5), NSMTMo 73699 (specimen 4), NSMTMo 73700 (specimen 3), NSMTMo 73701 (specimen 2).
|
||
</paragraph>
|
||
</subSubSection>
|
||
<subSubSection id="BC9625F8B27DFFC5FB32FD39D50528FB" pageId="5" pageNumber="6" type="diagnosis">
|
||
<paragraph id="F4337673B27DFFC5FB32FD39D50528FB" blockId="5.[264,1323,283,950]" pageId="5" pageNumber="6">
|
||
<emphasis id="C6F8AA61B27DFFC5FB32FD39D69129D3" bold="true" box="[312,432,644,670]" pageId="5" pageNumber="6">Diagnosis</emphasis>
|
||
: Shell thin, valves not gaping. Lower (right) valve flat, upper (left) valve convex. Ornamentation commarginal, affecting only the external surface, very fine ridges or lamellae covering the left valve from beak to margin in juveniles and adults, and the right valve only after the juvenile stage. Posterior auricles poorly delimited. Byssal notch without ctenolium under the anterior auricle of the right valve, widely opened in the juvenile, but gradually closing and finally overlapped by the dorsal expansion of its lower edge in the adult. Test principally calcitic, with an aragonite layer restricted to the area inside of the pallial line.
|
||
</paragraph>
|
||
</subSubSection>
|
||
<caption id="A0F326FBB27DFFC5FB02FC56D6EF2F67" ID-Table-UUID="A0F326FBB27DFFC5FB02FC56D6EF2F67" httpUri="http://table.plazi.org/id/A0F326FBB27DFFC5FB02FC56D6EF2F67" pageId="5" pageNumber="6" targetBox="[272,1259,1099,1379]" targetIsTable="true" targetPageId="5">
|
||
<paragraph id="F4337673B27DFFC5FB02FC56D6EF2F67" blockId="5.[264,1322,1003,1066]" pageId="5" pageNumber="6">
|
||
<emphasis id="C6F8AA61B27DFFC5FB02FC56D65B2F4E" bold="true" box="[264,378,1003,1027]" pageId="5" pageNumber="6">TABLE 2.</emphasis>
|
||
Measurements (mm) of the main shell parameters of
|
||
<taxonomicName id="338C0DF0B27DFFC5F9BBFC51D3B52F4E" box="[945,1172,1004,1027]" class="Bivalvia" family="Pectinidae" genus="Sinepecten" kingdom="Animalia" order="Pectinoida" pageId="5" pageNumber="6" phylum="Mollusca" rank="species" species="segonzaci">
|
||
<emphasis id="C6F8AA61B27DFFC5F9BBFC51D3B52F4E" box="[945,1172,1004,1027]" italics="true" pageId="5" pageNumber="6">Sinepecten segonzaci</emphasis>
|
||
</taxonomicName>
|
||
. (see Figure 3 for abbreviations).
|
||
</paragraph>
|
||
</caption>
|
||
<paragraph id="F4337673B27DFFC5FB1AFBF6D3F52E2E" pageId="5" pageNumber="6">
|
||
<table id="868C84D3B27D003FFB1AFBF6D3CA2E2E" box="[272,1259,1099,1379]" gridcols="8" gridrows="7" pageId="5" pageNumber="6">
|
||
<tr id="4ABC7431B27D003FFB1AFBF6D3CA2F2E" box="[272,1259,1099,1123]" gridrow="0" pageId="5" pageNumber="6">
|
||
<th id="096D1D4DB27D003FFB1AFBF6D65F2F2E" box="[272,382,1099,1123]" gridcol="0" gridrow="0" pageId="5" pageNumber="6">
|
||
<emphasis id="C6F8AA61B27DFFC5FB1AFBF6D65F2F2E" bold="true" box="[272,382,1099,1123]" pageId="5" pageNumber="6">Specimen</emphasis>
|
||
</th>
|
||
<th id="096D1D4DB27D003FFBB3FBF6D6D12F2E" box="[441,496,1099,1123]" gridcol="1" gridrow="0" pageId="5" pageNumber="6">
|
||
<emphasis id="C6F8AA61B27DFFC5FBB3FBF6D6D12F2E" bold="true" box="[441,496,1099,1123]" pageId="5" pageNumber="6">UPD</emphasis>
|
||
</th>
|
||
<th id="096D1D4DB27D003FF832FBF6D54E2F2E" box="[568,623,1099,1123]" gridcol="2" gridrow="0" pageId="5" pageNumber="6">
|
||
<emphasis id="C6F8AA61B27DFFC5F832FBF6D54E2F2E" bold="true" box="[568,623,1099,1123]" pageId="5" pageNumber="6">APD</emphasis>
|
||
</th>
|
||
<th id="096D1D4DB27D003FF8BDFBF6D5CA2F2E" box="[695,747,1099,1123]" gridcol="3" gridrow="0" pageId="5" pageNumber="6">
|
||
<emphasis id="C6F8AA61B27DFFC5F8BDFBF6D5C22F2E" bold="true" box="[695,739,1099,1123]" pageId="5" pageNumber="6">MC</emphasis>
|
||
</th>
|
||
<th id="096D1D4DB27D003FF93CFBF6D44C2F2E" box="[822,877,1099,1123]" gridcol="4" gridrow="0" pageId="5" pageNumber="6">
|
||
<emphasis id="C6F8AA61B27DFFC5F93CFBF6D44C2F2E" bold="true" box="[822,877,1099,1123]" pageId="5" pageNumber="6">TLA</emphasis>
|
||
</th>
|
||
<th id="096D1D4DB27D003FF9BFFBF6D4CC2F2E" box="[949,1005,1099,1123]" gridcol="5" gridrow="0" pageId="5" pageNumber="6">
|
||
<emphasis id="C6F8AA61B27DFFC5F9BFFBF6D4CC2F2E" bold="true" box="[949,1005,1099,1123]" pageId="5" pageNumber="6">LAA</emphasis>
|
||
</th>
|
||
<th id="096D1D4DB27D003FFE3EFBF6D34E2F2E" box="[1076,1135,1099,1123]" gridcol="6" gridrow="0" pageId="5" pageNumber="6">
|
||
<emphasis id="C6F8AA61B27DFFC5FE3EFBF6D34E2F2E" bold="true" box="[1076,1135,1099,1123]" pageId="5" pageNumber="6">HAA</emphasis>
|
||
</th>
|
||
<th id="096D1D4DB27D003FFEB9FBF6D3CA2F2E" box="[1203,1259,1099,1123]" gridcol="7" gridrow="0" pageId="5" pageNumber="6">
|
||
<emphasis id="C6F8AA61B27DFFC5FEB9FBF6D3CA2F2E" bold="true" box="[1203,1259,1099,1123]" pageId="5" pageNumber="6">DBN</emphasis>
|
||
</th>
|
||
</tr>
|
||
<tr id="4ABC7431B27D003FFB1AFBCBD3CA2FC3" box="[272,1259,1142,1166]" gridrow="1" pageId="5" pageNumber="6" rowspan-3="1" rowspan-4="1" rowspan-5="1" rowspan-6="1" rowspan-7="1">
|
||
<th id="096D1D4DB27D003FFB1AFBCBD65F2FC3" box="[272,382,1142,1166]" gridcol="0" gridrow="1" pageId="5" pageNumber="6">
|
||
<emphasis id="C6F8AA61B27DFFC5FB1AFBCBD63C2FC3" bold="true" box="[272,285,1142,1166]" pageId="5" pageNumber="6">1</emphasis>
|
||
</th>
|
||
<td id="096D1D4DB27D003FFBB3FBCBD6D12FC3" box="[441,496,1142,1166]" gridcol="1" gridrow="1" pageId="5" pageNumber="6">1.3</td>
|
||
<td id="096D1D4DB27D003FF832FBCBD54E2FC3" box="[568,623,1142,1166]" gridcol="2" gridrow="1" pageId="5" pageNumber="6">1.3</td>
|
||
</tr>
|
||
<tr id="4ABC7431B27D003FFB1AFB1CD3CA2FF4" box="[272,1259,1185,1209]" gridrow="2" pageId="5" pageNumber="6" rowspan-3="1">
|
||
<th id="096D1D4DB27D003FFB1AFB1CD65F2FF4" box="[272,382,1185,1209]" gridcol="0" gridrow="2" pageId="5" pageNumber="6">
|
||
<emphasis id="C6F8AA61B27DFFC5FB1AFB1CD63C2FF4" bold="true" box="[272,285,1185,1209]" pageId="5" pageNumber="6">2</emphasis>
|
||
</th>
|
||
<td id="096D1D4DB27D003FFBB3FB1CD6D12FF4" box="[441,496,1185,1209]" gridcol="1" gridrow="2" pageId="5" pageNumber="6">3.5</td>
|
||
<td id="096D1D4DB27D003FF832FB1CD54E2FF4" box="[568,623,1185,1209]" gridcol="2" gridrow="2" pageId="5" pageNumber="6">3</td>
|
||
<td id="096D1D4DB27D003FF93CFB1CD44C2FF4" box="[822,877,1185,1209]" gridcol="4" gridrow="2" pageId="5" pageNumber="6">2.9</td>
|
||
<td id="096D1D4DB27D003FF9BFFB1CD4CC2FF4" box="[949,1005,1185,1209]" gridcol="5" gridrow="2" pageId="5" pageNumber="6">1.6</td>
|
||
<td id="096D1D4DB27D003FFE3EFB1CD34E2FF4" box="[1076,1135,1185,1209]" gridcol="6" gridrow="2" pageId="5" pageNumber="6">1.6</td>
|
||
<td id="096D1D4DB27D003FFEB9FB1CD3CA2FF4" box="[1203,1259,1185,1209]" gridcol="7" gridrow="2" pageId="5" pageNumber="6">0.8</td>
|
||
</tr>
|
||
<tr id="4ABC7431B27D003FFB1AFB76D3CA2FAE" box="[272,1259,1227,1251]" gridrow="3" pageId="5" pageNumber="6" rowspan-3="1">
|
||
<th id="096D1D4DB27D003FFB1AFB76D65F2FAE" box="[272,382,1227,1251]" gridcol="0" gridrow="3" pageId="5" pageNumber="6">
|
||
<emphasis id="C6F8AA61B27DFFC5FB1AFB76D63C2FAE" bold="true" box="[272,285,1227,1251]" pageId="5" pageNumber="6">3</emphasis>
|
||
</th>
|
||
<td id="096D1D4DB27D003FFBB3FB76D6D12FAE" box="[441,496,1227,1251]" gridcol="1" gridrow="3" pageId="5" pageNumber="6">6</td>
|
||
<td id="096D1D4DB27D003FF832FB76D54E2FAE" box="[568,623,1227,1251]" gridcol="2" gridrow="3" pageId="5" pageNumber="6">5.5</td>
|
||
<td id="096D1D4DB27D003FF93CFB76D44C2FAE" box="[822,877,1227,1251]" gridcol="4" gridrow="3" pageId="5" pageNumber="6">4.3</td>
|
||
<td id="096D1D4DB27D003FF9BFFB76D4CC2FAE" box="[949,1005,1227,1251]" gridcol="5" gridrow="3" pageId="5" pageNumber="6">2.4</td>
|
||
<td id="096D1D4DB27D003FFE3EFB76D34E2FAE" box="[1076,1135,1227,1251]" gridcol="6" gridrow="3" pageId="5" pageNumber="6">2.3</td>
|
||
<td id="096D1D4DB27D003FFEB9FB76D3CA2FAE" box="[1203,1259,1227,1251]" gridcol="7" gridrow="3" pageId="5" pageNumber="6">1.2</td>
|
||
</tr>
|
||
<tr id="4ABC7431B27D003FFB1AFB4BD3CA2E43" box="[272,1259,1270,1294]" gridrow="4" pageId="5" pageNumber="6">
|
||
<th id="096D1D4DB27D003FFB1AFB4BD65F2E43" box="[272,382,1270,1294]" gridcol="0" gridrow="4" pageId="5" pageNumber="6">
|
||
<emphasis id="C6F8AA61B27DFFC5FB1AFB4BD63C2E43" bold="true" box="[272,285,1270,1294]" pageId="5" pageNumber="6">4</emphasis>
|
||
</th>
|
||
<td id="096D1D4DB27D003FFBB3FB4BD6D12E43" box="[441,496,1270,1294]" gridcol="1" gridrow="4" pageId="5" pageNumber="6">14</td>
|
||
<td id="096D1D4DB27D003FF832FB4BD54E2E43" box="[568,623,1270,1294]" gridcol="2" gridrow="4" pageId="5" pageNumber="6">14</td>
|
||
<td id="096D1D4DB27D003FF8BDFB4BD5CA2E43" box="[695,747,1270,1294]" gridcol="3" gridrow="4" pageId="5" pageNumber="6">3.2</td>
|
||
<td id="096D1D4DB27D003FF93CFB4BD44C2E43" box="[822,877,1270,1294]" gridcol="4" gridrow="4" pageId="5" pageNumber="6">7</td>
|
||
<td id="096D1D4DB27D003FF9BFFB4BD4CC2E43" box="[949,1005,1270,1294]" gridcol="5" gridrow="4" pageId="5" pageNumber="6">4</td>
|
||
<td id="096D1D4DB27D003FFE3EFB4BD34E2E43" box="[1076,1135,1270,1294]" gridcol="6" gridrow="4" pageId="5" pageNumber="6">2.5</td>
|
||
<td id="096D1D4DB27D003FFEB9FB4BD3CA2E43" box="[1203,1259,1270,1294]" gridcol="7" gridrow="4" pageId="5" pageNumber="6">2</td>
|
||
</tr>
|
||
<tr id="4ABC7431B27D003FFB1AFA9CD3CA2E74" box="[272,1259,1313,1337]" gridrow="5" pageId="5" pageNumber="6">
|
||
<th id="096D1D4DB27D003FFB1AFA9CD65F2E74" box="[272,382,1313,1337]" gridcol="0" gridrow="5" pageId="5" pageNumber="6">
|
||
<emphasis id="C6F8AA61B27DFFC5FB1AFA9CD63C2E74" bold="true" box="[272,285,1313,1337]" pageId="5" pageNumber="6">5</emphasis>
|
||
</th>
|
||
<td id="096D1D4DB27D003FFBB3FA9CD6D12E74" box="[441,496,1313,1337]" gridcol="1" gridrow="5" pageId="5" pageNumber="6">18</td>
|
||
<td id="096D1D4DB27D003FF832FA9CD54E2E74" box="[568,623,1313,1337]" gridcol="2" gridrow="5" pageId="5" pageNumber="6">18</td>
|
||
<td id="096D1D4DB27D003FF8BDFA9CD5CA2E74" box="[695,747,1313,1337]" gridcol="3" gridrow="5" pageId="5" pageNumber="6">3.7</td>
|
||
<td id="096D1D4DB27D003FF93CFA9CD44C2E74" box="[822,877,1313,1337]" gridcol="4" gridrow="5" pageId="5" pageNumber="6">9.6</td>
|
||
<td id="096D1D4DB27D003FF9BFFA9CD4CC2E74" box="[949,1005,1313,1337]" gridcol="5" gridrow="5" pageId="5" pageNumber="6">4.4</td>
|
||
<td id="096D1D4DB27D003FFE3EFA9CD34E2E74" box="[1076,1135,1313,1337]" gridcol="6" gridrow="5" pageId="5" pageNumber="6">2.4</td>
|
||
<td id="096D1D4DB27D003FFEB9FA9CD3CA2E74" box="[1203,1259,1313,1337]" gridcol="7" gridrow="5" pageId="5" pageNumber="6">2.3</td>
|
||
</tr>
|
||
<tr id="4ABC7431B27D003FFB1AFAF6D3CA2E2E" box="[272,1259,1355,1379]" gridrow="6" pageId="5" pageNumber="6">
|
||
<th id="096D1D4DB27D003FFB1AFAF6D65F2E2E" box="[272,382,1355,1379]" gridcol="0" gridrow="6" pageId="5" pageNumber="6">
|
||
<emphasis id="C6F8AA61B27DFFC5FB1AFAF6D63C2E2E" bold="true" box="[272,285,1355,1379]" pageId="5" pageNumber="6">6</emphasis>
|
||
</th>
|
||
<td id="096D1D4DB27D003FFBB3FAF6D6D12E2E" box="[441,496,1355,1379]" gridcol="1" gridrow="6" pageId="5" pageNumber="6">27</td>
|
||
<td id="096D1D4DB27D003FF832FAF6D54E2E2E" box="[568,623,1355,1379]" gridcol="2" gridrow="6" pageId="5" pageNumber="6">28</td>
|
||
<td id="096D1D4DB27D003FF8BDFAF6D5CA2E2E" box="[695,747,1355,1379]" gridcol="3" gridrow="6" pageId="5" pageNumber="6">7 à 9</td>
|
||
<td id="096D1D4DB27D003FF93CFAF6D44C2E2E" box="[822,877,1355,1379]" gridcol="4" gridrow="6" pageId="5" pageNumber="6">11.3</td>
|
||
<td id="096D1D4DB27D003FF9BFFAF6D4CC2E2E" box="[949,1005,1355,1379]" gridcol="5" gridrow="6" pageId="5" pageNumber="6">5.4</td>
|
||
<td id="096D1D4DB27D003FFE3EFAF6D34E2E2E" box="[1076,1135,1355,1379]" gridcol="6" gridrow="6" pageId="5" pageNumber="6">1.7</td>
|
||
<td id="096D1D4DB27D003FFEB9FAF6D3CA2E2E" box="[1203,1259,1355,1379]" gridcol="7" gridrow="6" pageId="5" pageNumber="6">1.8</td>
|
||
</tr>
|
||
</table>
|
||
</paragraph>
|
||
<subSubSection id="BC9625F8B27DFFC8FB32FA0BD3EC2D05" lastPageId="8" lastPageNumber="9" pageId="5" pageNumber="6" type="materials_examined">
|
||
<paragraph id="F4337673B27DFFC5FB32FA0BD31F2C5C" blockId="5.[264,1323,1462,1809]" pageId="5" pageNumber="6">
|
||
<emphasis id="C6F8AA61B27DFFC5FB32FA0BD50B2E9D" bold="true" box="[312,554,1462,1488]" pageId="5" pageNumber="6">Material examined</emphasis>
|
||
: The five specimens of the
|
||
<typeStatus id="2B37C8D1B27DFFC5F99AFA0AD4E32E9C" box="[912,962,1463,1489]" pageId="5" pageNumber="6">type</typeStatus>
|
||
series, which were collected alive, except specimen 5, come from the typelocality. Two of them (specimens 2 and 4) were treated for SEM observations. The left valve of specimen 5 was treated with Feigl’s solution for the identification of aragonite. A single postlarval valve in relatively poor preservation (specimen 1) was collected with sediment in a site without active venting. This material was collected by the manned submersible
|
||
<taxonomicName id="338C0DF0B27DFFC5F9BBF9C2D36F2DD5" box="[945,1102,1663,1688]" class="Polychaeta" family="Chrysopetalidae" genus="Shinkai" kingdom="Animalia" order="Phyllodocida" pageId="5" pageNumber="6" phylum="Annelida" rank="genus">
|
||
<emphasis id="C6F8AA61B27DFFC5F9BBF9C2D36F2DD5" box="[945,1102,1663,1688]" italics="true" pageId="5" pageNumber="6">Shinkai 2000</emphasis>
|
||
</taxonomicName>
|
||
during two dives: dive #1075,
|
||
<date id="803250B3B27DFFC5FB97F91AD5022D8C" box="[413,547,1703,1729]" pageId="5" pageNumber="6" value="1988-11-22">22.11.1988</date>
|
||
, Field E, Barnacle site,
|
||
<geoCoordinate id="91B810B4B27DFFC5F949F91AD4E92D8C" box="[835,968,1703,1729]" direction="south" orientation="latitude" pageId="5" pageNumber="6" precision="9" value="-3.727">03°43.62’S</geoCoordinate>
|
||
–
|
||
<geoCoordinate id="91B810B4B27DFFC5F9E3F91AD35D2D8C" box="[1001,1148,1703,1729]" direction="east" orientation="longitude" pageId="5" pageNumber="6" precision="9" value="151.672">151°40.32'E</geoCoordinate>
|
||
,
|
||
<quantity id="3374DB96B27DFFC5FE80F91AD3C42D8C" box="[1162,1253,1703,1729]" metricMagnitude="3" metricUnit="m" metricValue="1.674" pageId="5" pageNumber="6" unit="m" value="1674.0">1674 m</quantity>
|
||
(
|
||
<typeStatus id="2B37C8D1B27DFFC5FEFCF91AD20B2D8C" box="[1270,1322,1703,1729]" pageId="5" pageNumber="6">type</typeStatus>
|
||
series); dive # 1076,
|
||
<date id="803250B3B27DFFC5F80AF972D5A42DA4" box="[512,645,1743,1769]" pageId="5" pageNumber="6" value="1998-11-23">23.11.1998</date>
|
||
, Field D, slurp gun 2,
|
||
<geoCoordinate id="91B810B4B27DFFC5F99BF972D3342DA4" box="[913,1045,1743,1769]" direction="south" orientation="latitude" pageId="5" pageNumber="6" precision="9" value="-3.7288332">03°43.73’S</geoCoordinate>
|
||
–
|
||
<geoCoordinate id="91B810B4B27DFFC5FE25F972D3E52DA4" box="[1071,1220,1743,1769]" direction="east" orientation="longitude" pageId="5" pageNumber="6" precision="9" value="151.67017">151°40.21’E</geoCoordinate>
|
||
,
|
||
<quantity id="3374DB96B27DFFC5FEDBF972D20A2DA4" box="[1233,1323,1743,1769]" metricMagnitude="3" metricUnit="m" metricValue="1.623" pageId="5" pageNumber="6" unit="m" value="1623.0">1623 m</quantity>
|
||
(specimen 1). It was fixed in formalin, then preserved in ethanol 80%.
|
||
</paragraph>
|
||
<caption id="A0F326FBB27EFFC6FB02FEA6D4AB2A17" ID-Table-UUID="A0F326FBB27EFFC6FB02FEA6D4AB2A17" httpUri="http://table.plazi.org/id/A0F326FBB27EFFC6FB02FEA6D4AB2A17" pageId="6" pageNumber="7" targetBox="[272,1098,386,637]" targetIsTable="true" targetPageId="6">
|
||
<paragraph id="F4337673B27EFFC6FB02FEA6D4AB2A17" blockId="6.[264,1323,283,346]" pageId="6" pageNumber="7">
|
||
<emphasis id="C6F8AA61B27EFFC6FB02FEA6D65C2A7E" bold="true" box="[264,381,283,307]" pageId="6" pageNumber="7">TABLE 3.</emphasis>
|
||
Change in shape of byssal notch through shell ontogeny. HAA/LAA: relative height; DBN/LAA: relative depth. (see Figure 3 for abbreviations).
|
||
</paragraph>
|
||
</caption>
|
||
<paragraph id="F4337673B27EFFC6FB1AFE3FD4D32931" pageId="6" pageNumber="7">
|
||
<table id="868C84D3B27E003FFB1AFE3FD36B2930" box="[272,1098,386,637]" gridcols="3" gridrows="6" pageId="6" pageNumber="7">
|
||
<tr id="4ABC7431B27E003FFB1AFE3FD36B2AD7" box="[272,1098,386,410]" gridrow="0" pageId="6" pageNumber="7">
|
||
<th id="096D1D4DB27E003FFB1AFE3FD65F2AD7" box="[272,382,386,410]" gridcol="0" gridrow="0" pageId="6" pageNumber="7">
|
||
<emphasis id="C6F8AA61B27EFFC6FB1AFE3FD65F2AD7" bold="true" box="[272,382,386,410]" pageId="6" pageNumber="7">Specimen</emphasis>
|
||
</th>
|
||
<th id="096D1D4DB27E003FF87BFE3FD5CD2AD7" box="[625,748,386,410]" gridcol="1" gridrow="0" pageId="6" pageNumber="7">
|
||
<emphasis id="C6F8AA61B27EFFC6F87BFE3FD5CD2AD7" bold="true" box="[625,748,386,410]" pageId="6" pageNumber="7">HAA/LAA</emphasis>
|
||
</th>
|
||
<th id="096D1D4DB27E003FF9DBFE3FD36B2AD7" box="[977,1098,386,410]" gridcol="2" gridrow="0" pageId="6" pageNumber="7">
|
||
<emphasis id="C6F8AA61B27EFFC6F9DBFE3FD36B2AD7" bold="true" box="[977,1098,386,410]" pageId="6" pageNumber="7">DBN/LAA</emphasis>
|
||
</th>
|
||
</tr>
|
||
<tr id="4ABC7431B27E003FFB1AFE12D36B2A8A" box="[272,1098,431,455]" gridrow="1" pageId="6" pageNumber="7">
|
||
<th id="096D1D4DB27E003FFB1AFE12D65F2A8A" box="[272,382,431,455]" gridcol="0" gridrow="1" pageId="6" pageNumber="7">
|
||
<emphasis id="C6F8AA61B27EFFC6FB1AFE12D63C2A8A" bold="true" box="[272,285,431,455]" pageId="6" pageNumber="7">2</emphasis>
|
||
</th>
|
||
<td id="096D1D4DB27E003FF87BFE12D5CD2A8A" box="[625,748,431,455]" gridcol="1" gridrow="1" pageId="6" pageNumber="7">1</td>
|
||
<td id="096D1D4DB27E003FF9DBFE12D36B2A8A" box="[977,1098,431,455]" gridcol="2" gridrow="1" pageId="6" pageNumber="7">0.5</td>
|
||
</tr>
|
||
<tr id="4ABC7431B27E003FFB1AFE61D36B2AB9" box="[272,1098,476,500]" gridrow="2" pageId="6" pageNumber="7">
|
||
<th id="096D1D4DB27E003FFB1AFE61D65F2AB9" box="[272,382,476,500]" gridcol="0" gridrow="2" pageId="6" pageNumber="7">
|
||
<emphasis id="C6F8AA61B27EFFC6FB1AFE61D63C2AB9" bold="true" box="[272,285,476,500]" pageId="6" pageNumber="7">3</emphasis>
|
||
</th>
|
||
<td id="096D1D4DB27E003FF87BFE61D5CD2AB9" box="[625,748,476,500]" gridcol="1" gridrow="2" pageId="6" pageNumber="7">0.9</td>
|
||
<td id="096D1D4DB27E003FF9DBFE61D36B2AB9" box="[977,1098,476,500]" gridcol="2" gridrow="2" pageId="6" pageNumber="7">0.5</td>
|
||
</tr>
|
||
<tr id="4ABC7431B27E003FFB1AFDB7D36B296F" box="[272,1098,522,546]" gridrow="3" pageId="6" pageNumber="7">
|
||
<th id="096D1D4DB27E003FFB1AFDB7D65F296F" box="[272,382,522,546]" gridcol="0" gridrow="3" pageId="6" pageNumber="7">
|
||
<emphasis id="C6F8AA61B27EFFC6FB1AFDB7D63C296F" bold="true" box="[272,285,522,546]" pageId="6" pageNumber="7">4</emphasis>
|
||
</th>
|
||
<td id="096D1D4DB27E003FF87BFDB7D5CD296F" box="[625,748,522,546]" gridcol="1" gridrow="3" pageId="6" pageNumber="7">0.6</td>
|
||
<td id="096D1D4DB27E003FF9DBFDB7D36B296F" box="[977,1098,522,546]" gridcol="2" gridrow="3" pageId="6" pageNumber="7">0.5</td>
|
||
</tr>
|
||
<tr id="4ABC7431B27E003FFB1AFD8AD36B2902" box="[272,1098,567,591]" gridrow="4" pageId="6" pageNumber="7">
|
||
<th id="096D1D4DB27E003FFB1AFD8AD65F2902" box="[272,382,567,591]" gridcol="0" gridrow="4" pageId="6" pageNumber="7">
|
||
<emphasis id="C6F8AA61B27EFFC6FB1AFD8AD63C2902" bold="true" box="[272,285,567,591]" pageId="6" pageNumber="7">5</emphasis>
|
||
</th>
|
||
<td id="096D1D4DB27E003FF87BFD8AD5CD2902" box="[625,748,567,591]" gridcol="1" gridrow="4" pageId="6" pageNumber="7">0.5</td>
|
||
<td id="096D1D4DB27E003FF9DBFD8AD36B2902" box="[977,1098,567,591]" gridcol="2" gridrow="4" pageId="6" pageNumber="7">0.5</td>
|
||
</tr>
|
||
<tr id="4ABC7431B27E003FFB1AFDD8D36B2930" box="[272,1098,613,637]" gridrow="5" pageId="6" pageNumber="7">
|
||
<th id="096D1D4DB27E003FFB1AFDD8D65F2930" box="[272,382,613,637]" gridcol="0" gridrow="5" pageId="6" pageNumber="7">
|
||
<emphasis id="C6F8AA61B27EFFC6FB1AFDD8D63C2930" bold="true" box="[272,285,613,637]" pageId="6" pageNumber="7">6</emphasis>
|
||
</th>
|
||
<td id="096D1D4DB27E003FF87BFDD8D5CD2930" box="[625,748,613,637]" gridcol="1" gridrow="5" pageId="6" pageNumber="7">0.3</td>
|
||
<td id="096D1D4DB27E003FF9DBFDD8D36B2930" box="[977,1098,613,637]" gridcol="2" gridrow="5" pageId="6" pageNumber="7">0.3</td>
|
||
</tr>
|
||
</table>
|
||
</paragraph>
|
||
<caption id="A0F326FBB27EFFC6FB02F948D3F12C1F" httpUri="https://zenodo.org/record/171945/files/figure.png" pageId="6" pageNumber="7" targetBox="[266,1322,737,1738]" targetPageId="6">
|
||
<paragraph id="F4337673B27EFFC6FB02F948D3F12C1F" blockId="6.[264,1323,1781,1874]" pageId="6" pageNumber="7">
|
||
<emphasis id="C6F8AA61B27EFFC6FB02F948D6AF2C40" bold="true" box="[264,398,1781,1805]" pageId="6" pageNumber="7">FIGURE 4.</emphasis>
|
||
Holotype of
|
||
<taxonomicName id="338C0DF0B27EFFC6F823F948D4302C41" box="[553,785,1781,1804]" class="Bivalvia" family="Pectinidae" genus="Sinepecten" kingdom="Animalia" order="Pectinoida" pageId="6" pageNumber="7" phylum="Mollusca" rank="species" species="segonzaci">
|
||
<emphasis id="C6F8AA61B27EFFC6F823F948D4302C41" box="[553,785,1781,1804]" italics="true" pageId="6" pageNumber="7">Sinepecten segonzaci</emphasis>
|
||
</taxonomicName>
|
||
. a: upper (left) valve; b: lower (right) valve; c: dorsal region of the right valve showing the anterodorsal margin of the disk (black arrow) slightly overlapping the anterior auricle (aa). White arrow indicating a sharp growth line (see text).
|
||
</paragraph>
|
||
</caption>
|
||
<caption id="A0F326FBB27FFFC7FB02FB6AD54B2D49" httpUri="https://zenodo.org/record/171946/files/figure.png" pageId="7" pageNumber="8" targetBox="[284,1309,353,1215]" targetPageId="7">
|
||
<paragraph id="F4337673B27FFFC7FB02FB6AD54B2D49" blockId="7.[264,1323,1239,1540]" pageId="7" pageNumber="8">
|
||
<emphasis id="C6F8AA61B27FFFC7FB02FB6AD6AA2FA2" bold="true" box="[264,395,1239,1263]" pageId="7" pageNumber="8">FIGURE 5.</emphasis>
|
||
Life posture in
|
||
<taxonomicName id="338C0DF0B27FFFC7F837FB65D4032FA2" box="[573,802,1240,1263]" class="Bivalvia" family="Pectinidae" genus="Sinepecten" kingdom="Animalia" order="Pectinoida" pageId="7" pageNumber="8" phylum="Mollusca" rank="species" species="segonzaci" status="gen. nov.">
|
||
<emphasis id="C6F8AA61B27FFFC7F837FB65D4032FA2" box="[573,802,1240,1263]" italics="true" pageId="7" pageNumber="8">Sinepecten segonzaci</emphasis>
|
||
</taxonomicName>
|
||
<taxonomicNameLabel id="DDCB171AB27FFFC7F921FB6AD4562FA3" box="[811,887,1239,1262]" pageId="7" pageNumber="8" rank="genus">n. gen.</taxonomicNameLabel>
|
||
, n. sp. with byssal fixation compared in juveniles (sp. 2–4) and in the largest adult specimen (sp. 6), i.e. the holotype. a: parasagittal sections of bivalve specimens: tight byssal fixation fitting the lower (right) valve to the substrate; b: external view of anterodorsal region of shell underside. Inner surface of upper (left) valve (grey) appears behind byssal notch of lower valve; c: parasagittal section along xy showing byssus emerging from byssal notch. aa: anterior auricle; bf: byssal fasciole; bn: byssal notch; bs: byssal sinus. Arrows in (b) and (c) indicating relative growth direction of dorsal and ventral edges of byssal notch. On all figures, thick outline corresponding to lower (right) valve, coarse stipple to shell interior, and fine stipple to inner face of left valve.
|
||
</paragraph>
|
||
</caption>
|
||
<paragraph id="F4337673B27FFFC7FB32F9E2D59C2C57" blockId="7.[264,1323,1631,1898]" pageId="7" pageNumber="8">
|
||
<typeStatus id="2B37C8D1B27FFFC7FB32F9E2D6FF2D34" box="[312,478,1631,1657]" pageId="7" pageNumber="8" type="holotype">
|
||
<emphasis id="C6F8AA61B27FFFC7FB32F9E2D6FF2D34" bold="true" box="[312,478,1631,1657]" pageId="7" pageNumber="8">HOLOTYPE</emphasis>
|
||
</typeStatus>
|
||
(
|
||
<figureCitation id="6CB76AF6B27FFFC7FBF8F9DDD5A62D37" box="[498,647,1632,1658]" captionStart-0="FIGURE 4" captionStart-1="FIGURE 5" captionStart-2="FIGURE 6" captionStart-3="FIGURE 7" captionStartId-0="6.[264,367,1781,1805]" captionStartId-1="7.[264,367,1239,1263]" captionStartId-2="8.[264,368,1323,1347]" captionStartId-3="9.[264,368,1088,1112]" captionTargetBox-0="[266,1322,737,1738]" captionTargetBox-1="[284,1309,353,1215]" captionTargetBox-2="[280,1309,866,1277]" captionTargetBox-3="[281,1306,705,1043]" captionTargetId-0="figure@6.[264,1323,722,1754]" captionTargetId-1="figure@7.[264,1323,329,1229]" captionTargetId-2="figure@8.[264,1323,849,1296]" captionTargetId-3="figure@9.[264,1323,689,1061]" captionTargetPageId-0="6" captionTargetPageId-1="7" captionTargetPageId-2="8" captionTargetPageId-3="9" captionText-0="FIGURE 4. Holotype of Sinepecten segonzaci. a: upper (left) valve; b: lower (right) valve; c: dorsal region of the right valve showing the anterodorsal margin of the disk (black arrow) slightly overlapping the anterior auricle (aa). White arrow indicating a sharp growth line (see text)." captionText-1="FIGURE 5. Life posture in Sinepecten segonzaci n. gen., n. sp. with byssal fixation compared in juveniles (sp. 2 – 4) and in the largest adult specimen (sp. 6), i. e. the holotype. a: parasagittal sections of bivalve specimens: tight byssal fixation fitting the lower (right) valve to the substrate; b: external view of anterodorsal region of shell underside. Inner surface of upper (left) valve (grey) appears behind byssal notch of lower valve; c: parasagittal section along xy showing byssus emerging from byssal notch. aa: anterior auricle; bf: byssal fasciole; bn: byssal notch; bs: byssal sinus. Arrows in (b) and (c) indicating relative growth direction of dorsal and ventral edges of byssal notch. On all figures, thick outline corresponding to lower (right) valve, coarse stipple to shell interior, and fine stipple to inner face of left valve." captionText-2="FIGURE 6. Ontogeny of right valve anterior auricle and byssal notch. The specimens sp. 2 to sp. 6 (a) are laid flat. Byssal notch of sp. 6 is hidden in (a); in (b) sp. 6 is tilted forward to make it conspicuous. Behind the right valve, the left valve is present, umbonal part stippled, internal surface black. Horizontal lines: hollow of byssal fasciole." captionText-3="FIGURE 7. Right valve outline and prismatic calcite extent through ontogeny. The five specimens (2 to 6) are drawn at the same size to emphasize the change in outline from prismatic stage (dark grey) to adult. Extent of prismatic calcite on anterior auricle (AA) indicated only on sp. 2." httpUri-0="https://zenodo.org/record/171945/files/figure.png" httpUri-1="https://zenodo.org/record/171946/files/figure.png" httpUri-2="https://zenodo.org/record/171947/files/figure.png" httpUri-3="https://zenodo.org/record/171948/files/figure.png" pageId="7" pageNumber="8">Figures 4–7</figureCitation>
|
||
,
|
||
<tableCitation id="B90E43C8B27FFFC7F893F9DDD4012D37" box="[665,800,1632,1658]" captionStart-0="TABLE 2" captionStart-1="TABLE 3" captionStartId-0="5.[264,352,1003,1027]" captionStartId-1="6.[264,352,283,307]" captionTargetBox-0="[272,1259,1099,1379]" captionTargetBox-1="[272,1098,386,637]" captionTargetPageId-0="5" captionTargetPageId-1="6" captionText-0="TABLE 2. Measurements (mm) of the main shell parameters of Sinepecten segonzaci. (see Figure 3 for abbreviations)." captionText-1="TABLE 3. Change in shape of byssal notch through shell ontogeny. HAA / LAA: relative height; DBN / LAA: relative depth. (see Figure 3 for abbreviations)." httpUri-0="http://table.plazi.org/id/A0F326FBB27DFFC5FB02FC56D6EF2F67" httpUri-1="http://table.plazi.org/id/A0F326FBB27EFFC6FB02FEA6D4AB2A17" pageId="7" pageNumber="8" tableUuid-0="A0F326FBB27DFFC5FB02FC56D6EF2F67" tableUuid-1="A0F326FBB27EFFC6FB02FEA6D4AB2A17">Tables 2–3</tableCitation>
|
||
, specimen 6): Shell irregular, distorted by adaptation to the hard substrate (
|
||
<figureCitation id="6CB76AF6B27FFFC7F89BF935D5DB2DEF" box="[657,762,1672,1698]" captionStart="FIGURE 4" captionStartId="6.[264,367,1781,1805]" captionTargetBox="[266,1322,737,1738]" captionTargetId="figure@6.[264,1323,722,1754]" captionTargetPageId="6" captionText="FIGURE 4. Holotype of Sinepecten segonzaci. a: upper (left) valve; b: lower (right) valve; c: dorsal region of the right valve showing the anterodorsal margin of the disk (black arrow) slightly overlapping the anterior auricle (aa). White arrow indicating a sharp growth line (see text)." httpUri="https://zenodo.org/record/171945/files/figure.png" pageId="7" pageNumber="8">Figure 4</figureCitation>
|
||
a–b). In spite of distortion, right valve roughly flat up to a height of
|
||
<quantity id="3374DB96B27FFFC7F80BF90DD55E2D87" box="[513,639,1712,1738]" metricMagnitude="-2" metricUnit="m" metricValue="1.15" metricValueMax="1.2" metricValueMin="1.1" pageId="7" pageNumber="8" unit="mm" value="11.5" valueMax="12.0" valueMin="11.0">11–12 mm</quantity>
|
||
(
|
||
<figureCitation id="6CB76AF6B27FFFC7F884F90DD5D22D87" box="[654,755,1712,1738]" captionStart="FIGURE 5" captionStartId="7.[264,367,1239,1263]" captionTargetBox="[284,1309,353,1215]" captionTargetId="figure@7.[264,1323,329,1229]" captionTargetPageId="7" captionText="FIGURE 5. Life posture in Sinepecten segonzaci n. gen., n. sp. with byssal fixation compared in juveniles (sp. 2 – 4) and in the largest adult specimen (sp. 6), i. e. the holotype. a: parasagittal sections of bivalve specimens: tight byssal fixation fitting the lower (right) valve to the substrate; b: external view of anterodorsal region of shell underside. Inner surface of upper (left) valve (grey) appears behind byssal notch of lower valve; c: parasagittal section along xy showing byssus emerging from byssal notch. aa: anterior auricle; bf: byssal fasciole; bn: byssal notch; bs: byssal sinus. Arrows in (b) and (c) indicating relative growth direction of dorsal and ventral edges of byssal notch. On all figures, thick outline corresponding to lower (right) valve, coarse stipple to shell interior, and fine stipple to inner face of left valve." httpUri="https://zenodo.org/record/171946/files/figure.png" pageId="7" pageNumber="8">Figure 5</figureCitation>
|
||
a), and left valve convex. Closed valves without any gape other than the byssal notch. Auricles dissymmetrical with a byssal notch under the anterior auricle of the right valve.
|
||
</paragraph>
|
||
<paragraph id="F4337673B27FFFC8FB32F895D47A285B" blockId="7.[264,1323,1631,1898]" lastBlockId="8.[264,1325,284,790]" lastPageId="8" lastPageNumber="9" pageId="7" pageNumber="8">
|
||
Anterior auricle (
|
||
<quantity id="3374DB96B27FFFC7F805F895D5522C0F" box="[527,627,1832,1858]" metricMagnitude="-3" metricUnit="m" metricValue="5.4" pageId="7" pageNumber="8" unit="mm" value="5.4">5.4 mm</quantity>
|
||
) slightly shorter than the posterior (
|
||
<quantity id="3374DB96B27FFFC7FE4AF895D3862C0F" box="[1088,1191,1832,1858]" metricMagnitude="-3" metricUnit="m" metricValue="5.9" pageId="7" pageNumber="8" unit="mm" value="5.9">5.9 mm</quantity>
|
||
). Posterior auricle poorly demarcated from disk, with only a shallow flexure between their surfaces, and no clear limit on the oblique posterior edge. Byssal notch without ctenolium hidden by the dorsal overlap of its ventral edge and thus observable only in dorsal view (
|
||
<figureCitation id="6CB76AF6B270FFC8FEB9FEF9D23D2A13" box="[1203,1308,324,350]" captionStart="FIGURE 6" captionStartId="8.[264,368,1323,1347]" captionTargetBox="[280,1309,866,1277]" captionTargetId="figure@8.[264,1323,849,1296]" captionTargetPageId="8" captionText="FIGURE 6. Ontogeny of right valve anterior auricle and byssal notch. The specimens sp. 2 to sp. 6 (a) are laid flat. Byssal notch of sp. 6 is hidden in (a); in (b) sp. 6 is tilted forward to make it conspicuous. Behind the right valve, the left valve is present, umbonal part stippled, internal surface black. Horizontal lines: hollow of byssal fasciole." httpUri="https://zenodo.org/record/171947/files/figure.png" pageId="8" pageNumber="9">Figure 6</figureCitation>
|
||
). Anterodorsal edge of the disk (ventral edge of the byssal notch) sinuous, proximally leaving the depressed byssal fasciole uncovered, and distally extending slightly above the lower edge of the anterior auricle (
|
||
<figureCitation id="6CB76AF6B270FFC8F8A9FE01D4282A9B" box="[675,777,444,470]" captionStart="FIGURE 5" captionStartId="7.[264,367,1239,1263]" captionTargetBox="[284,1309,353,1215]" captionTargetId="figure@7.[264,1323,329,1229]" captionTargetPageId="7" captionText="FIGURE 5. Life posture in Sinepecten segonzaci n. gen., n. sp. with byssal fixation compared in juveniles (sp. 2 – 4) and in the largest adult specimen (sp. 6), i. e. the holotype. a: parasagittal sections of bivalve specimens: tight byssal fixation fitting the lower (right) valve to the substrate; b: external view of anterodorsal region of shell underside. Inner surface of upper (left) valve (grey) appears behind byssal notch of lower valve; c: parasagittal section along xy showing byssus emerging from byssal notch. aa: anterior auricle; bf: byssal fasciole; bn: byssal notch; bs: byssal sinus. Arrows in (b) and (c) indicating relative growth direction of dorsal and ventral edges of byssal notch. On all figures, thick outline corresponding to lower (right) valve, coarse stipple to shell interior, and fine stipple to inner face of left valve." httpUri="https://zenodo.org/record/171946/files/figure.png" pageId="8" pageNumber="9">Figure 5</figureCitation>
|
||
b). Dorsal expansion of this edge concomitant of a peculiar growth stage marked on the disk by a strong undulation just after a very sharp growth line at a UPD of
|
||
<quantity id="3374DB96B270FFC8F824FDB1D552296B" box="[558,627,524,550]" metricMagnitude="-3" metricUnit="m" metricValue="6.0" pageId="8" pageNumber="9" unit="mm" value="6.0">6 mm</quantity>
|
||
(
|
||
<figureCitation id="6CB76AF6B270FFC8F888FDB1D5C8296B" box="[642,745,524,550]" captionStart="FIGURE 4" captionStartId="6.[264,367,1781,1805]" captionTargetBox="[266,1322,737,1738]" captionTargetId="figure@6.[264,1323,722,1754]" captionTargetPageId="6" captionText="FIGURE 4. Holotype of Sinepecten segonzaci. a: upper (left) valve; b: lower (right) valve; c: dorsal region of the right valve showing the anterodorsal margin of the disk (black arrow) slightly overlapping the anterior auricle (aa). White arrow indicating a sharp growth line (see text)." httpUri="https://zenodo.org/record/171945/files/figure.png" pageId="8" pageNumber="9">Figure 4</figureCitation>
|
||
c).On both valves, disk and auricles with a dense commarginal ornamentation of ridges regularly spaced, and transforming to lamellae. On the left valve, ornamentation starts from the beak, covering disk and auricles. Interval between ridges or lamellae increasing with shell growth, from about
|
||
<quantity id="3374DB96B270FFC8FE33FD39D3B529D3" box="[1081,1172,644,670]" metricMagnitude="-4" metricUnit="m" metricValue="1.0" pageId="8" pageNumber="9" unit="mm" value="0.1">0.1 mm</quantity>
|
||
at a UPD of
|
||
<quantity id="3374DB96B270FFC8FB02FD11D67E298B" box="[264,351,684,710]" metricMagnitude="-2" metricUnit="m" metricValue="1.2" pageId="8" pageNumber="9" unit="mm" value="12.0">12 mm</quantity>
|
||
, to
|
||
<quantity id="3374DB96B270FFC8FB84FD11D6CB298B" box="[398,490,684,710]" metricMagnitude="-4" metricUnit="m" metricValue="3.0" pageId="8" pageNumber="9" unit="mm" value="0.3">0.3 mm</quantity>
|
||
at least near the ventral edge. On the right valve, the outer prismatic layer terminates at a
|
||
<quantity id="3374DB96B270FFC8F80FFD69D57B29A3" box="[517,602,724,750]" metricMagnitude="-2" metricUnit="m" metricValue="1.0" pageId="8" pageNumber="9" unit="mm" value="10.0">10 mm</quantity>
|
||
UPD, and the same ornamentation as on the left valve then replaces the faint and narrow commarginal fluting.
|
||
</paragraph>
|
||
<caption id="A0F326FBB270FFC8FB02FA96D4382EE7" httpUri="https://zenodo.org/record/171947/files/figure.png" pageId="8" pageNumber="9" targetBox="[280,1309,866,1277]" targetPageId="8">
|
||
<paragraph id="F4337673B270FFC8FB02FA96D4382EE7" blockId="8.[264,1323,1323,1450]" pageId="8" pageNumber="9">
|
||
<emphasis id="C6F8AA61B270FFC8FB02FA96D6AD2E0E" bold="true" box="[264,396,1323,1347]" pageId="8" pageNumber="9">FIGURE 6.</emphasis>
|
||
Ontogeny of right valve anterior auricle and byssal notch. The specimens sp.2 to sp.6 (a) are laid flat. Byssal notch of sp.6 is hidden in (a); in (b) sp.6 is tilted forward to make it conspicuous. Behind the right valve, the left valve is present, umbonal part stippled, internal surface black. Horizontal lines: hollow of byssal fasciole.
|
||
</paragraph>
|
||
</caption>
|
||
<paragraph id="F4337673B270FFC8FB32FA63D3EC2D05" blockId="8.[264,1324,1502,1888]" pageId="8" pageNumber="9">
|
||
<typeStatus id="2B37C8D1B270FFC8FB32FA63D6C22EB5" box="[312,483,1502,1528]" pageId="8" pageNumber="9" type="paratype">
|
||
<emphasis id="C6F8AA61B270FFC8FB32FA63D6C22EB5" bold="true" box="[312,483,1502,1528]" pageId="8" pageNumber="9">PARATYPES</emphasis>
|
||
</typeStatus>
|
||
(
|
||
<figureCitation id="6CB76AF6B270FFC8FBFDFA63D5AA2EB5" box="[503,651,1502,1528]" captionStart-0="FIGURE 2" captionStart-1="FIGURE 3" captionStartId-0="2.[264,368,850,874]" captionStartId-1="2.[264,367,1549,1573]" captionTargetBox-0="[280,1305,346,801]" captionTargetBox-1="[281,1303,1119,1498]" captionTargetId-0="figure@2.[264,1323,329,823]" captionTargetId-1="figure@2.[264,1323,1108,1522]" captionTargetPageId-0="2" captionTargetPageId-1="2" captionText-0="FIGURE 2. Morphological characters of juvenile shell (prismatic stage) of Sinepecten segonzaci n. gen., n. sp. External view of left (a) and right (c) valves, with sagittal section (b) through bivalve shell. aa: anterior auricle; bf: byssal fasciole; bn: byssal notch; bs: byssal sinus; cr: commarginal ridge; di: disk; lv: left valve; ma: marginal apron; pa: posterior auricle; rv: right valve; u: umbo; A: anterior side; D: dorsal side; P: posterior side; V: ventral side. Arrow on (b) indicating hinge axis." captionText-1="FIGURE 3. Parameters measured on shell of Sinepecten segonzaci n. gen., n. sp. a: view of bivalve shell from the right side; b: sagittal section trough bivalve shell; c: anterior auricle and byssal notch of the right valve. Interior surface of the left valve stippled. Arrow on (b) indicating hinge axis. APD: anteriorposterior diameter; DBN: depth of byssal notch; HAA: height of anterior auricle; LAA: length of anterior auricle: LV left valve; MC: maximal convexity; RV: right valve; TLA: total length of auricles; UPD: umbonopallial diameter (linear height)." httpUri-0="https://zenodo.org/record/171943/files/figure.png" httpUri-1="https://zenodo.org/record/171944/files/figure.png" pageId="8" pageNumber="9">Figures 2–3</figureCitation>
|
||
,
|
||
<figureCitation id="6CB76AF6B270FFC8F891FA63D5F82EB5" box="[667,729,1502,1528]" captionStart-0="FIGURE 5" captionStart-1="FIGURE 6" captionStart-2="FIGURE 7" captionStart-3="FIGURE 8" captionStart-4="FIGURE 9" captionStart-5="FIGURE 10" captionStart-6="FIGURE 11" captionStart-7="FIGURE 12" captionStartId-0="7.[264,367,1239,1263]" captionStartId-1="8.[264,368,1323,1347]" captionStartId-2="9.[264,368,1088,1112]" captionStartId-3="10.[264,368,1510,1534]" captionStartId-4="11.[264,368,1532,1556]" captionStartId-5="12.[264,368,1319,1343]" captionStartId-6="13.[264,367,1650,1674]" captionStartId-7="14.[264,368,930,954]" captionTargetBox-0="[284,1309,353,1215]" captionTargetBox-1="[280,1309,866,1277]" captionTargetBox-2="[281,1306,705,1043]" captionTargetBox-3="[264,1323,969,1484]" captionTargetBox-4="[264,1322,430,1508]" captionTargetBox-5="[265,1320,884,1303]" captionTargetBox-6="[297,1290,609,1622]" captionTargetBox-7="[284,1307,346,887]" captionTargetId-0="figure@7.[264,1323,329,1229]" captionTargetId-1="figure@8.[264,1323,849,1296]" captionTargetId-2="figure@9.[264,1323,689,1061]" captionTargetId-3="figure@10.[264,1323,969,1484]" captionTargetId-4="figure@11.[264,1323,426,1508]" captionTargetId-5="figure@12.[264,1323,876,1303]" captionTargetId-6="figure@13.[297,1291,609,1623]" captionTargetId-7="figure@14.[264,1323,326,906]" captionTargetPageId-0="7" captionTargetPageId-1="8" captionTargetPageId-2="9" captionTargetPageId-3="10" captionTargetPageId-4="11" captionTargetPageId-5="12" captionTargetPageId-6="13" captionTargetPageId-7="14" captionText-0="FIGURE 5. Life posture in Sinepecten segonzaci n. gen., n. sp. with byssal fixation compared in juveniles (sp. 2 – 4) and in the largest adult specimen (sp. 6), i. e. the holotype. a: parasagittal sections of bivalve specimens: tight byssal fixation fitting the lower (right) valve to the substrate; b: external view of anterodorsal region of shell underside. Inner surface of upper (left) valve (grey) appears behind byssal notch of lower valve; c: parasagittal section along xy showing byssus emerging from byssal notch. aa: anterior auricle; bf: byssal fasciole; bn: byssal notch; bs: byssal sinus. Arrows in (b) and (c) indicating relative growth direction of dorsal and ventral edges of byssal notch. On all figures, thick outline corresponding to lower (right) valve, coarse stipple to shell interior, and fine stipple to inner face of left valve." captionText-1="FIGURE 6. Ontogeny of right valve anterior auricle and byssal notch. The specimens sp. 2 to sp. 6 (a) are laid flat. Byssal notch of sp. 6 is hidden in (a); in (b) sp. 6 is tilted forward to make it conspicuous. Behind the right valve, the left valve is present, umbonal part stippled, internal surface black. Horizontal lines: hollow of byssal fasciole." captionText-2="FIGURE 7. Right valve outline and prismatic calcite extent through ontogeny. The five specimens (2 to 6) are drawn at the same size to emphasize the change in outline from prismatic stage (dark grey) to adult. Extent of prismatic calcite on anterior auricle (AA) indicated only on sp. 2." captionText-3="FIGURE 8. Juvenile paratypes of Sinepecten segonzaci. a: specimen 2, lower (right) side of the anterodorsal region; b: lower side of specimen 3 showing the marginal apron of the right valve (arrows)." captionText-4="FIGURE 9. SEM views of specimens 2 (a, c) and 4 (b, d – f) of Sinepecten segonzaci. a: outer view of the anterodorsal region of the right valve; b: inner view of the anterodorsal part of the right valve; c: magnification of the outer layer of (a) near the ventral margin; d: calcite laths of the foliated structure; e: inner view of the beak region of the left valve (see Figure 12); f: hinge surface, magnification as in (d)." captionText-5="FIGURE 10. Coiling of dorsal edge of anterior auricle and of outer ligament insertion. Left: interior view of right valve anterior auricle (not exactly to scale: height of outer ligament insertion oversized). Right: proximal (A) and distal (B) sections of bivalve shell through anterior auricle. aa: anterior auricle; bn: byssal notch; h: hinge; lv: left valve; oli: outer ligament insertion; ri: resilium insertion (inner ligament); rv: right valve." captionText-6="FIGURE 11. SEM views of specimens 2 (a, b, e) and 4 (c, d, f) of Sinepecten segonzaci. a: outer view of the left valve; b: same valve, detail of the ornamentation near the ventral margin of the disk; c: left valve, anterior margin of the disk; d: same valve, magnification of the antimarginal microsculpture; e: same valve, detail of ornamentation on the anterior edge of the anterior auricle; f: particles embedded on the disk surface of the right valve; on all figures arrow indicates the growth direction." captionText-7="FIGURE 12. Muscle insertions, microstructures exposed and hydrothermal venting influence on the internal shell surface of specimen 4. A: left valve; A’: umbonopallial section; B: right valve; ai: adductor insertion; gsi: gill suspensor insertion; pmi: pallial muscle insertion; pri: pedal retractor insertion; ri: resilium insertion. 1: foliated calcite; 2: aragonitic middle shell layer; 3 to 5: myostracal aragonite, prismatic in adductor myostracum (3) and dorsal pallial muscle insertion (4), spherulitic in pallial line (5); 6: resilium fibrous aragonite." httpUri-0="https://zenodo.org/record/171946/files/figure.png" httpUri-1="https://zenodo.org/record/171947/files/figure.png" httpUri-2="https://zenodo.org/record/171948/files/figure.png" httpUri-3="https://zenodo.org/record/171949/files/figure.png" httpUri-4="https://zenodo.org/record/171950/files/figure.png" httpUri-5="https://zenodo.org/record/171951/files/figure.png" httpUri-6="https://zenodo.org/record/171952/files/figure.png" httpUri-7="https://zenodo.org/record/171953/files/figure.png" pageId="8" pageNumber="9">5–12</figureCitation>
|
||
,
|
||
<tableCitation id="B90E43C8B270FFC8F8E3FA63D4512EB5" box="[745,880,1502,1528]" captionStart-0="TABLE 2" captionStart-1="TABLE 3" captionStartId-0="5.[264,352,1003,1027]" captionStartId-1="6.[264,352,283,307]" captionTargetBox-0="[272,1259,1099,1379]" captionTargetBox-1="[272,1098,386,637]" captionTargetPageId-0="5" captionTargetPageId-1="6" captionText-0="TABLE 2. Measurements (mm) of the main shell parameters of Sinepecten segonzaci. (see Figure 3 for abbreviations)." captionText-1="TABLE 3. Change in shape of byssal notch through shell ontogeny. HAA / LAA: relative height; DBN / LAA: relative depth. (see Figure 3 for abbreviations)." httpUri-0="http://table.plazi.org/id/A0F326FBB27DFFC5FB02FC56D6EF2F67" httpUri-1="http://table.plazi.org/id/A0F326FBB27EFFC6FB02FEA6D4AB2A17" pageId="8" pageNumber="9" tableUuid-0="A0F326FBB27DFFC5FB02FC56D6EF2F67" tableUuid-1="A0F326FBB27EFFC6FB02FEA6D4AB2A17">Tables 2–3</tableCitation>
|
||
, specimens 2 to 5): The
|
||
<typeStatus id="2B37C8D1B270FFC8FEA0FA63D3FD2EB5" box="[1194,1244,1502,1528]" pageId="8" pageNumber="9">type</typeStatus>
|
||
series constitutes an ontogenetic sequence (specimens numbered by increasing size), which offers the opportunity to follow some changes in shell morphology during growth.
|
||
</paragraph>
|
||
</subSubSection>
|
||
<subSubSection id="BC9625F8B270FFCFFB32F9EBD4422C03" lastPageId="15" lastPageNumber="16" pageId="8" pageNumber="9" type="description">
|
||
<paragraph id="F4337673B270FFC9FB32F9EBD5BE2ACB" blockId="8.[264,1324,1502,1888]" lastBlockId="9.[264,1325,284,630]" lastPageId="9" lastPageNumber="10" pageId="8" pageNumber="9">
|
||
<emphasis id="C6F8AA61B270FFC8FB32F9EBD6FE2D3D" bold="true" box="[312,479,1622,1648]" pageId="8" pageNumber="9">Shell outline:</emphasis>
|
||
The outline of the shell in the commissure plane is the first character obviously changing through ontogeny (
|
||
<figureCitation id="6CB76AF6B270FFC8F8EBF9C3D46A2DD5" box="[737,843,1662,1688]" captionStart="FIGURE 7" captionStartId="9.[264,368,1088,1112]" captionTargetBox="[281,1306,705,1043]" captionTargetId="figure@9.[264,1323,689,1061]" captionTargetPageId="9" captionText="FIGURE 7. Right valve outline and prismatic calcite extent through ontogeny. The five specimens (2 to 6) are drawn at the same size to emphasize the change in outline from prismatic stage (dark grey) to adult. Extent of prismatic calcite on anterior auricle (AA) indicated only on sp. 2." httpUri="https://zenodo.org/record/171948/files/figure.png" pageId="8" pageNumber="9">Figure 7</figureCitation>
|
||
), from higher than wide in the juvenile specimens 2 and 3 to as high as wide in specimens 4 and 5, and finally wider than high in the
|
||
<typeStatus id="2B37C8D1B270FFC8FB3CF973D6812DA5" box="[310,416,1742,1768]" pageId="8" pageNumber="9" type="holotype">holotype</typeStatus>
|
||
. In the juvenile prismatic stage illustrated by specimens 2 and 3, when the shell is closed, the disk margin of the right valve is upturned and adpressed against the inner face of the left valve margin (
|
||
<figureCitation id="6CB76AF6B270FFC8F8A5F8A3D4342C75" box="[687,789,1822,1848]" captionStart="FIGURE 2" captionStartId="2.[264,368,850,874]" captionTargetBox="[280,1305,346,801]" captionTargetId="figure@2.[264,1323,329,823]" captionTargetPageId="2" captionText="FIGURE 2. Morphological characters of juvenile shell (prismatic stage) of Sinepecten segonzaci n. gen., n. sp. External view of left (a) and right (c) valves, with sagittal section (b) through bivalve shell. aa: anterior auricle; bf: byssal fasciole; bn: byssal notch; bs: byssal sinus; cr: commarginal ridge; di: disk; lv: left valve; ma: marginal apron; pa: posterior auricle; rv: right valve; u: umbo; A: anterior side; D: dorsal side; P: posterior side; V: ventral side. Arrow on (b) indicating hinge axis." httpUri="https://zenodo.org/record/171943/files/figure.png" pageId="8" pageNumber="9">Figure 2</figureCitation>
|
||
b–c). The line along which the margin of the right valve is flexed corresponds to a line of lower mechanical resistance, so that the marginal apron detaches as soon as the valves are separated. This character, which is common in Propeamussiinae (Schein 1989;
|
||
<bibRefCitation id="901D0B82B271FFC9F900FEF9D3172A13" author="Morton" box="[778,1078,324,350]" pageId="9" pageNumber="26" refString="Morton B. & Thurston M. H. (1989) The functional morphology of Propeamussium lucidum (Bivalvia: Pectinacea), a deep-sea predatory scallop. Journal of Zoology London, 218, 471 - 496." type="journal article" year="1989">Morton & Thurston 1989</bibRefCitation>
|
||
), disappears after the prismatic stage (specimens 4 to 6).
|
||
</paragraph>
|
||
<paragraph id="F4337673B271FFC9FB32FE2ED4F3293B" blockId="9.[264,1325,284,630]" pageId="9" pageNumber="10">
|
||
<emphasis id="C6F8AA61B271FFC9FB32FE2ED6882AE0" bold="true" box="[312,425,403,429]" pageId="9" pageNumber="10">Auricles:</emphasis>
|
||
None of the specimens has both its auricles intact, but their dissymmetry can be verified by reconstruction of the complete outline. The anterior auricle is slightly longer than the posterior in specimens 2 to 4, whereas it seems to be the opposite in the
|
||
<typeStatus id="2B37C8D1B271FFC9FB02FDB1D64F296B" box="[264,366,524,550]" pageId="9" pageNumber="10" type="holotype">holotype</typeStatus>
|
||
(
|
||
<tableCitation id="B90E43C8B271FFC9FB74FDB1D6F8296B" box="[382,473,524,550]" captionStart="TABLE 2" captionStartId="5.[264,352,1003,1027]" captionTargetBox="[272,1259,1099,1379]" captionTargetPageId="5" captionText="TABLE 2. Measurements (mm) of the main shell parameters of Sinepecten segonzaci. (see Figure 3 for abbreviations)." httpUri="http://table.plazi.org/id/A0F326FBB27DFFC5FB02FC56D6EF2F67" pageId="9" pageNumber="10" tableUuid="A0F326FBB27DFFC5FB02FC56D6EF2F67">Table 2</tableCitation>
|
||
). In all specimens, the posterior auricle is poorly delimited. Its posterior edge is almost perpendicular to the dorsal edge in the juvenile specimens 2 and 3, and becomes increasingly oblique in specimens 4 to 6 (
|
||
<figureCitation id="6CB76AF6B271FFC9F957FDE1D4E5293B" box="[861,964,604,630]" captionStart="FIGURE 7" captionStartId="9.[264,368,1088,1112]" captionTargetBox="[281,1306,705,1043]" captionTargetId="figure@9.[264,1323,689,1061]" captionTargetPageId="9" captionText="FIGURE 7. Right valve outline and prismatic calcite extent through ontogeny. The five specimens (2 to 6) are drawn at the same size to emphasize the change in outline from prismatic stage (dark grey) to adult. Extent of prismatic calcite on anterior auricle (AA) indicated only on sp. 2." httpUri="https://zenodo.org/record/171948/files/figure.png" pageId="9" pageNumber="10">Figure 7</figureCitation>
|
||
).
|
||
</paragraph>
|
||
<caption id="A0F326FBB271FFC9FB02FBFDD39E2FD0" httpUri="https://zenodo.org/record/171948/files/figure.png" pageId="9" pageNumber="10" targetBox="[281,1306,705,1043]" targetPageId="9">
|
||
<paragraph id="F4337673B271FFC9FB02FBFDD39E2FD0" blockId="9.[264,1322,1088,1181]" pageId="9" pageNumber="10">
|
||
<emphasis id="C6F8AA61B271FFC9FB02FBFDD6AB2F15" bold="true" box="[264,394,1088,1112]" pageId="9" pageNumber="10">FIGURE 7.</emphasis>
|
||
Right valve outline and prismatic calcite extent through ontogeny. The five specimens (2 to 6) are drawn at the same size to emphasize the change in outline from prismatic stage (dark grey) to adult. Extent of prismatic calcite on anterior auricle (AA) indicated only on sp.2.
|
||
</paragraph>
|
||
</caption>
|
||
<paragraph id="F4337673B271FFC9FB32FB6DD3F32C26" blockId="9.[264,1324,1232,1899]" pageId="9" pageNumber="10">
|
||
<emphasis id="C6F8AA61B271FFC9FB32FB6DD6FE2FA7" bold="true" box="[312,479,1232,1258]" pageId="9" pageNumber="10">Byssal notch:</emphasis>
|
||
On the anterior side of the right valve, the auricle and the byssal notch undergo a profound change (
|
||
<figureCitation id="6CB76AF6B271FFC9F854FB44D5E72E5E" box="[606,710,1273,1299]" captionStart="FIGURE 6" captionStartId="8.[264,368,1323,1347]" captionTargetBox="[280,1309,866,1277]" captionTargetId="figure@8.[264,1323,849,1296]" captionTargetPageId="8" captionText="FIGURE 6. Ontogeny of right valve anterior auricle and byssal notch. The specimens sp. 2 to sp. 6 (a) are laid flat. Byssal notch of sp. 6 is hidden in (a); in (b) sp. 6 is tilted forward to make it conspicuous. Behind the right valve, the left valve is present, umbonal part stippled, internal surface black. Horizontal lines: hollow of byssal fasciole." httpUri="https://zenodo.org/record/171947/files/figure.png" pageId="9" pageNumber="10">Figure 6</figureCitation>
|
||
). The byssal notch is triangular and widely open in the juvenile specimens (
|
||
<figureCitation id="6CB76AF6B271FFC9F829FA9CD5B42E76" box="[547,661,1313,1339]" captionStart="FIGURE 8" captionStartId="10.[264,368,1510,1534]" captionTargetBox="[264,1323,969,1484]" captionTargetId="figure@10.[264,1323,969,1484]" captionTargetPageId="10" captionText="FIGURE 8. Juvenile paratypes of Sinepecten segonzaci. a: specimen 2, lower (right) side of the anterodorsal region; b: lower side of specimen 3 showing the marginal apron of the right valve (arrows)." httpUri="https://zenodo.org/record/171949/files/figure.png" pageId="9" pageNumber="10">Figures 8</figureCitation>
|
||
,
|
||
<figureCitation id="6CB76AF6B271FFC9F8A9FA9CD5922E76" box="[675,691,1313,1339]" captionStart="FIGURE 9" captionStartId="11.[264,368,1532,1556]" captionTargetBox="[264,1322,430,1508]" captionTargetId="figure@11.[264,1323,426,1508]" captionTargetPageId="11" captionText="FIGURE 9. SEM views of specimens 2 (a, c) and 4 (b, d – f) of Sinepecten segonzaci. a: outer view of the anterodorsal region of the right valve; b: inner view of the anterodorsal part of the right valve; c: magnification of the outer layer of (a) near the ventral margin; d: calcite laths of the foliated structure; e: inner view of the beak region of the left valve (see Figure 12); f: hinge surface, magnification as in (d)." httpUri="https://zenodo.org/record/171950/files/figure.png" pageId="9" pageNumber="10">9</figureCitation>
|
||
a), and begins to narrow after the end of the prismatic stage (
|
||
<figureCitation id="6CB76AF6B271FFC9FB5EFAF4D69B2E2E" box="[340,442,1353,1379]" captionStart="FIGURE 9" captionStartId="11.[264,368,1532,1556]" captionTargetBox="[264,1322,430,1508]" captionTargetId="figure@11.[264,1323,426,1508]" captionTargetPageId="11" captionText="FIGURE 9. SEM views of specimens 2 (a, c) and 4 (b, d – f) of Sinepecten segonzaci. a: outer view of the anterodorsal region of the right valve; b: inner view of the anterodorsal part of the right valve; c: magnification of the outer layer of (a) near the ventral margin; d: calcite laths of the foliated structure; e: inner view of the beak region of the left valve (see Figure 12); f: hinge surface, magnification as in (d)." httpUri="https://zenodo.org/record/171950/files/figure.png" pageId="9" pageNumber="10">Figure 9</figureCitation>
|
||
b). It is still quite visible on the specimen 5, but seems to have disappeared on the
|
||
<typeStatus id="2B37C8D1B271FFC9FB51FACCD6E02EC6" box="[347,449,1393,1419]" pageId="9" pageNumber="10" type="holotype">holotype</typeStatus>
|
||
(
|
||
<figureCitation id="6CB76AF6B271FFC9FBD9FACCD51A2EC6" box="[467,571,1393,1419]" captionStart="FIGURE 4" captionStartId="6.[264,367,1781,1805]" captionTargetBox="[266,1322,737,1738]" captionTargetId="figure@6.[264,1323,722,1754]" captionTargetPageId="6" captionText="FIGURE 4. Holotype of Sinepecten segonzaci. a: upper (left) valve; b: lower (right) valve; c: dorsal region of the right valve showing the anterodorsal margin of the disk (black arrow) slightly overlapping the anterior auricle (aa). White arrow indicating a sharp growth line (see text)." httpUri="https://zenodo.org/record/171945/files/figure.png" pageId="9" pageNumber="10">Figure 4</figureCitation>
|
||
c). Though the passage for the byssus is almost invisible in the
|
||
<typeStatus id="2B37C8D1B271FFC9FB02FA24D6532EFE" box="[264,370,1433,1459]" pageId="9" pageNumber="10" type="holotype">holotype</typeStatus>
|
||
, it is not closed, but has undergone a change in size, shape and orientation. In the juvenile, it lies in the plane of the right valve, but later it sinks inwards with the ventral edge of the anterior auricle (i.e. the dorsal edge of the byssal notch), and in the
|
||
<typeStatus id="2B37C8D1B271FFC9FEA6FA54D2332D4E" box="[1196,1298,1513,1539]" pageId="9" pageNumber="10" type="holotype">holotype</typeStatus>
|
||
it has shifted to a plane more or less perpendicular to the disk plane so that the opening is dorsally directed (
|
||
<figureCitation id="6CB76AF6B271FFC9FBEEF984D5752D1E" box="[484,596,1593,1619]" captionStart="FIGURE 5" captionStartId="7.[264,367,1239,1263]" captionTargetBox="[284,1309,353,1215]" captionTargetId="figure@7.[264,1323,329,1229]" captionTargetPageId="7" captionText="FIGURE 5. Life posture in Sinepecten segonzaci n. gen., n. sp. with byssal fixation compared in juveniles (sp. 2 – 4) and in the largest adult specimen (sp. 6), i. e. the holotype. a: parasagittal sections of bivalve specimens: tight byssal fixation fitting the lower (right) valve to the substrate; b: external view of anterodorsal region of shell underside. Inner surface of upper (left) valve (grey) appears behind byssal notch of lower valve; c: parasagittal section along xy showing byssus emerging from byssal notch. aa: anterior auricle; bf: byssal fasciole; bn: byssal notch; bs: byssal sinus. Arrows in (b) and (c) indicating relative growth direction of dorsal and ventral edges of byssal notch. On all figures, thick outline corresponding to lower (right) valve, coarse stipple to shell interior, and fine stipple to inner face of left valve." httpUri="https://zenodo.org/record/171946/files/figure.png" pageId="9" pageNumber="10">Figures 5</figureCitation>
|
||
b–c, 6). On the inner face of the specimen 4, there is a fold in the proximal end of the byssal notch (
|
||
<figureCitation id="6CB76AF6B271FFC9F8C0F9DCD4102D36" box="[714,817,1633,1659]" captionStart="FIGURE 9" captionStartId="11.[264,368,1532,1556]" captionTargetBox="[264,1322,430,1508]" captionTargetId="figure@11.[264,1323,426,1508]" captionTargetPageId="11" captionText="FIGURE 9. SEM views of specimens 2 (a, c) and 4 (b, d – f) of Sinepecten segonzaci. a: outer view of the anterodorsal region of the right valve; b: inner view of the anterodorsal part of the right valve; c: magnification of the outer layer of (a) near the ventral margin; d: calcite laths of the foliated structure; e: inner view of the beak region of the left valve (see Figure 12); f: hinge surface, magnification as in (d)." httpUri="https://zenodo.org/record/171950/files/figure.png" pageId="9" pageNumber="10">Figure 9</figureCitation>
|
||
b). This is probably induced by the ventral edge of the auricle beginning to move inward. In the
|
||
<typeStatus id="2B37C8D1B271FFC9F971F934D4C42DEE" box="[891,997,1673,1699]" pageId="9" pageNumber="10" type="holotype">holotype</typeStatus>
|
||
, this edge is covered by the anterodorsal edge of the disk (
|
||
<figureCitation id="6CB76AF6B271FFC9F877F90CD5C72D86" box="[637,742,1713,1739]" captionStart="FIGURE 4" captionStartId="6.[264,367,1781,1805]" captionTargetBox="[266,1322,737,1738]" captionTargetId="figure@6.[264,1323,722,1754]" captionTargetPageId="6" captionText="FIGURE 4. Holotype of Sinepecten segonzaci. a: upper (left) valve; b: lower (right) valve; c: dorsal region of the right valve showing the anterodorsal margin of the disk (black arrow) slightly overlapping the anterior auricle (aa). White arrow indicating a sharp growth line (see text)." httpUri="https://zenodo.org/record/171945/files/figure.png" pageId="9" pageNumber="10">Figure 4</figureCitation>
|
||
c). The byssal notch is not only narrowed by the overlap of its ventral edge, but also shortened by the byssal fasciole growing forward (
|
||
<figureCitation id="6CB76AF6B271FFC9FB1AF8BCD6A42C56" box="[272,389,1793,1819]" captionStart="FIGURE 5" captionStartId="7.[264,367,1239,1263]" captionTargetBox="[284,1309,353,1215]" captionTargetId="figure@7.[264,1323,329,1229]" captionTargetPageId="7" captionText="FIGURE 5. Life posture in Sinepecten segonzaci n. gen., n. sp. with byssal fixation compared in juveniles (sp. 2 – 4) and in the largest adult specimen (sp. 6), i. e. the holotype. a: parasagittal sections of bivalve specimens: tight byssal fixation fitting the lower (right) valve to the substrate; b: external view of anterodorsal region of shell underside. Inner surface of upper (left) valve (grey) appears behind byssal notch of lower valve; c: parasagittal section along xy showing byssus emerging from byssal notch. aa: anterior auricle; bf: byssal fasciole; bn: byssal notch; bs: byssal sinus. Arrows in (b) and (c) indicating relative growth direction of dorsal and ventral edges of byssal notch. On all figures, thick outline corresponding to lower (right) valve, coarse stipple to shell interior, and fine stipple to inner face of left valve." httpUri="https://zenodo.org/record/171946/files/figure.png" pageId="9" pageNumber="10">Figures 5</figureCitation>
|
||
b, 13). The measurements show clearly the gradual decrease of height with growth, and the sudden drop of depth in the
|
||
<typeStatus id="2B37C8D1B271FFC9F94CF894D48C2C0E" box="[838,941,1833,1859]" pageId="9" pageNumber="10" type="holotype">holotype</typeStatus>
|
||
(
|
||
<tableCitation id="B90E43C8B271FFC9F9C8F894D3022C0E" box="[962,1059,1833,1859]" captionStart="TABLE 3" captionStartId="6.[264,352,283,307]" captionTargetBox="[272,1098,386,637]" captionTargetPageId="6" captionText="TABLE 3. Change in shape of byssal notch through shell ontogeny. HAA / LAA: relative height; DBN / LAA: relative depth. (see Figure 3 for abbreviations)." httpUri="http://table.plazi.org/id/A0F326FBB27EFFC6FB02FEA6D4AB2A17" pageId="9" pageNumber="10" tableUuid="A0F326FBB27EFFC6FB02FEA6D4AB2A17">Table 3</tableCitation>
|
||
). This morphological change starts after the prismatic stage and is achieved in the largest specimen only.
|
||
</paragraph>
|
||
<paragraph id="F4337673B272FFCAFB32FEA6D59528C3" blockId="10.[264,1324,283,910]" pageId="10" pageNumber="11">
|
||
<emphasis id="C6F8AA61B272FFCAFB32FEA6D5292A78" bold="true" box="[312,520,283,309]" pageId="10" pageNumber="11">Ligament areas:</emphasis>
|
||
On the internal face, the resilifer in which the inner ligament is attached, is prosocline (
|
||
<figureCitation id="6CB76AF6B272FFCAF82FFEF9D5B92A13" box="[549,664,324,350]" captionStart="FIGURE 9" captionStartId="11.[264,368,1532,1556]" captionTargetBox="[264,1322,430,1508]" captionTargetId="figure@11.[264,1323,426,1508]" captionTargetPageId="11" captionText="FIGURE 9. SEM views of specimens 2 (a, c) and 4 (b, d – f) of Sinepecten segonzaci. a: outer view of the anterodorsal region of the right valve; b: inner view of the anterodorsal part of the right valve; c: magnification of the outer layer of (a) near the ventral margin; d: calcite laths of the foliated structure; e: inner view of the beak region of the left valve (see Figure 12); f: hinge surface, magnification as in (d)." httpUri="https://zenodo.org/record/171950/files/figure.png" pageId="10" pageNumber="11">Figures 9</figureCitation>
|
||
b, 9e). The outer ligament, which prevents shearing or rotational movements of the valves, is attached along the dorsal edge of auricles. On each auricle, the dorsal edge is coiling from the beak to the distal extremity, and this is achieved as follows: the left valve beak overhangs the right valve, but it is opposite in the anterior end, where the dorsal edge of the right valve curves over the left valve (
|
||
<figureCitation id="6CB76AF6B272FFCAFE62FE59D3C12AB3" box="[1128,1248,484,510]" captionStart="FIGURE 10" captionStartId="12.[264,368,1319,1343]" captionTargetBox="[265,1320,884,1303]" captionTargetId="figure@12.[264,1323,876,1303]" captionTargetPageId="12" captionText="FIGURE 10. Coiling of dorsal edge of anterior auricle and of outer ligament insertion. Left: interior view of right valve anterior auricle (not exactly to scale: height of outer ligament insertion oversized). Right: proximal (A) and distal (B) sections of bivalve shell through anterior auricle. aa: anterior auricle; bn: byssal notch; h: hinge; lv: left valve; oli: outer ligament insertion; ri: resilium insertion (inner ligament); rv: right valve." httpUri="https://zenodo.org/record/171951/files/figure.png" pageId="10" pageNumber="11">Figure 10</figureCitation>
|
||
). This coiling is absent in the juveniles, and owing to the poor preservation of the other specimens, it was not possible to ascertain which valve curves over the other in the posterior auricle. It is probably the right valve over the left, and to a less extent than anteriorly as in most pectinids examined in comparison, i.e.,
|
||
<taxonomicName id="338C0DF0B272FFCAF9DFFD39D20A29D3" authority="Linne, 1758" authorityName="Linne" authorityYear="1758" box="[981,1323,644,670]" class="Bivalvia" family="Pectinidae" genus="Pecten" kingdom="Animalia" order="Pectinoida" pageId="10" pageNumber="11" phylum="Mollusca" rank="species" species="maximus">
|
||
<emphasis id="C6F8AA61B272FFCAF9DFFD39D3B429D0" box="[981,1173,644,669]" italics="true" pageId="10" pageNumber="11">Pecten maximus</emphasis>
|
||
Linné, 1758
|
||
</taxonomicName>
|
||
and
|
||
<taxonomicName id="338C0DF0B272FFCAFB4DFD11D586298B" authority="Linne, 1758" authorityName="Linne" authorityYear="1758" box="[327,679,684,710]" class="Bivalvia" family="Pectinidae" genus="Chamys" higherTaxonomySource="GBIF" kingdom="Animalia" order="Ostreoida" pageId="10" pageNumber="11" phylum="Mollusca" rank="species" species="varia">
|
||
<emphasis id="C6F8AA61B272FFCAFB4DFD11D6D92988" box="[327,504,684,709]" italics="true" pageId="10" pageNumber="11">Chamys varia</emphasis>
|
||
Linné, 1758
|
||
</taxonomicName>
|
||
for example. On the opposite, in the deepsea
|
||
<taxonomicName id="338C0DF0B272FFCAFB02FD69D5CA29A3" authority="Jeffreys, 1873" authorityName="Jeffreys" authorityYear="1873" box="[264,747,724,750]" class="Bivalvia" family="Propeamussiidae" genus="Propeamussium" kingdom="Animalia" order="Pectinoida" pageId="10" pageNumber="11" phylum="Mollusca" rank="species" species="lucidum">
|
||
<emphasis id="C6F8AA61B272FFCAFB02FD69D50A29A0" box="[264,555,724,749]" italics="true" pageId="10" pageNumber="11">Propeamussium lucidum</emphasis>
|
||
(Jeffreys, 1873)
|
||
</taxonomicName>
|
||
described by
|
||
<bibRefCitation id="901D0B82B272FFCAF99BFD69D3EE29A3" author="Morton" box="[913,1231,724,750]" pageId="10" pageNumber="26" refString="Morton B. & Thurston M. H. (1989) The functional morphology of Propeamussium lucidum (Bivalvia: Pectinacea), a deep-sea predatory scallop. Journal of Zoology London, 218, 471 - 496." type="journal article" year="1989">Morton & Thurston (1989)</bibRefCitation>
|
||
the left valve curves over the right at the distal end of the posterior auricle, and more markedly than at the end of the anterior auricle. In all cases, the same valve curves over the other at the anterior and posterior ends of the dorsal margin. This curvature is probably necessary to make the locking device efficient.
|
||
</paragraph>
|
||
<caption id="A0F326FBB272FFCAFB02FA5BD64B2D0E" httpUri="https://zenodo.org/record/171949/files/figure.png" pageId="10" pageNumber="11" targetBox="[264,1323,969,1484]" targetPageId="10">
|
||
<paragraph id="F4337673B272FFCAFB02FA5BD64B2D0E" blockId="10.[264,1323,1510,1603]" pageId="10" pageNumber="11">
|
||
<emphasis id="C6F8AA61B272FFCAFB02FA5BD6AD2EB3" bold="true" box="[264,396,1510,1534]" pageId="10" pageNumber="11">FIGURE 8.</emphasis>
|
||
Juvenile paratypes of
|
||
<taxonomicName id="338C0DF0B272FFCAF88DFA5AD44D2EB3" box="[647,876,1511,1534]" class="Bivalvia" family="Pectinidae" genus="Sinepecten" kingdom="Animalia" order="Pectinoida" pageId="10" pageNumber="11" phylum="Mollusca" rank="species" species="segonzaci">
|
||
<emphasis id="C6F8AA61B272FFCAF88DFA5AD44D2EB3" box="[647,876,1511,1534]" italics="true" pageId="10" pageNumber="11">Sinepecten segonzaci</emphasis>
|
||
</taxonomicName>
|
||
. a: specimen 2, lower (right) side of the anterodorsal region; b: lower side of specimen 3 showing the marginal apron of the right valve (arrows).
|
||
</paragraph>
|
||
</caption>
|
||
<paragraph id="F4337673B272FFCBFB32F9CCD32A2ACB" blockId="10.[264,1323,1649,1875]" lastBlockId="11.[264,1323,284,390]" lastPageId="11" lastPageNumber="12" pageId="10" pageNumber="11">
|
||
<emphasis id="C6F8AA61B272FFCAFB32F9CCD6AD2DC6" bold="true" box="[312,396,1649,1675]" pageId="10" pageNumber="11">Hinge:</emphasis>
|
||
Immediately ventral to the outer ligament, two flat areas are separated by the resilifer on each valve: each auricle has one such area which stretches along the dorsal margin and tapers almost to nothing at its distal extremity (
|
||
<figureCitation id="6CB76AF6B272FFCAF9DFF97CD3662D96" box="[981,1095,1729,1755]" captionStart="FIGURE 9" captionStartId="11.[264,368,1532,1556]" captionTargetBox="[264,1322,430,1508]" captionTargetId="figure@11.[264,1323,426,1508]" captionTargetPageId="11" captionText="FIGURE 9. SEM views of specimens 2 (a, c) and 4 (b, d – f) of Sinepecten segonzaci. a: outer view of the anterodorsal region of the right valve; b: inner view of the anterodorsal part of the right valve; c: magnification of the outer layer of (a) near the ventral margin; d: calcite laths of the foliated structure; e: inner view of the beak region of the left valve (see Figure 12); f: hinge surface, magnification as in (d)." httpUri="https://zenodo.org/record/171950/files/figure.png" pageId="10" pageNumber="11">Figures 9</figureCitation>
|
||
b, 9e, 10). The flat areas are edentulous, but their surface is minutely roughened, and therefore opposed to shearing. In fact, SEM observation of this toothless hinge shows that between the valves the calcite crystals clash by their points (
|
||
<figureCitation id="6CB76AF6B272FFCAF8E9F884D4692C1E" box="[739,840,1849,1875]" captionStart="FIGURE 9" captionStartId="11.[264,368,1532,1556]" captionTargetBox="[264,1322,430,1508]" captionTargetId="figure@11.[264,1323,426,1508]" captionTargetPageId="11" captionText="FIGURE 9. SEM views of specimens 2 (a, c) and 4 (b, d – f) of Sinepecten segonzaci. a: outer view of the anterodorsal region of the right valve; b: inner view of the anterodorsal part of the right valve; c: magnification of the outer layer of (a) near the ventral margin; d: calcite laths of the foliated structure; e: inner view of the beak region of the left valve (see Figure 12); f: hinge surface, magnification as in (d)." httpUri="https://zenodo.org/record/171950/files/figure.png" pageId="10" pageNumber="11">Figure 9</figureCitation>
|
||
f). The rod shape of the crystals and their more or less upright orientation in the hinge contrasts with their tablet shape and their arrangement parallel to the depositional surface outside the hinge where the typical foliated structure covers the inner surface of the shell (
|
||
<figureCitation id="6CB76AF6B273FFCBF98DFED1D4CD2ACB" box="[903,1004,364,390]" captionStart="FIGURE 9" captionStartId="11.[264,368,1532,1556]" captionTargetBox="[264,1322,430,1508]" captionTargetId="figure@11.[264,1323,426,1508]" captionTargetPageId="11" captionText="FIGURE 9. SEM views of specimens 2 (a, c) and 4 (b, d – f) of Sinepecten segonzaci. a: outer view of the anterodorsal region of the right valve; b: inner view of the anterodorsal part of the right valve; c: magnification of the outer layer of (a) near the ventral margin; d: calcite laths of the foliated structure; e: inner view of the beak region of the left valve (see Figure 12); f: hinge surface, magnification as in (d)." httpUri="https://zenodo.org/record/171950/files/figure.png" pageId="11" pageNumber="12">Figure 9</figureCitation>
|
||
d).
|
||
</paragraph>
|
||
<caption id="A0F326FBB273FFCBFB02FA41D5212DD3" httpUri="https://zenodo.org/record/171950/files/figure.png" pageId="11" pageNumber="12" targetBox="[264,1322,430,1508]" targetPageId="11">
|
||
<paragraph id="F4337673B273FFCBFB02FA41D5212DD3" blockId="11.[264,1323,1532,1694]" pageId="11" pageNumber="12">
|
||
<emphasis id="C6F8AA61B273FFCBFB02FA41D6AD2D59" bold="true" box="[264,396,1532,1556]" pageId="11" pageNumber="12">FIGURE 9.</emphasis>
|
||
SEM views of specimens 2 (a,c) and 4 (b, d–f) of
|
||
<taxonomicName id="338C0DF0B273FFCBF9A6FA40D3B12D59" box="[940,1168,1533,1556]" class="Bivalvia" family="Pectinidae" genus="Sinepecten" kingdom="Animalia" order="Pectinoida" pageId="11" pageNumber="12" phylum="Mollusca" rank="species" species="segonzaci">
|
||
<emphasis id="C6F8AA61B273FFCBF9A6FA40D3B12D59" box="[940,1168,1533,1556]" italics="true" pageId="11" pageNumber="12">Sinepecten segonzaci</emphasis>
|
||
</taxonomicName>
|
||
. a: outer view of the anterodorsal region of the right valve; b: inner view of the anterodorsal part of the right valve; c: magnification of the outer layer of (a) near the ventral margin; d: calcite laths of the foliated structure; e: inner view of the beak region of the left valve (see Figure 12); f: hinge surface, magnification as in (d).
|
||
</paragraph>
|
||
</caption>
|
||
<paragraph id="F4337673B273FFCCFB32F971D3AF2873" blockId="11.[264,1324,1740,1887]" lastBlockId="12.[264,1323,284,830]" lastPageId="12" lastPageNumber="13" pageId="11" pageNumber="12">
|
||
<emphasis id="C6F8AA61B273FFCBFB32F971D5942DAB" bold="true" box="[312,693,1740,1766]" pageId="11" pageNumber="12">Ornamentation of left valve:</emphasis>
|
||
The commarginal ornamentation affects only the external surface of the shell (
|
||
<figureCitation id="6CB76AF6B273FFCBF879F948D5CB2C42" box="[627,746,1781,1807]" captionStart="FIGURE 11" captionStartId="13.[264,367,1650,1674]" captionTargetBox="[297,1290,609,1622]" captionTargetId="figure@13.[297,1291,609,1623]" captionTargetPageId="13" captionText="FIGURE 11. SEM views of specimens 2 (a, b, e) and 4 (c, d, f) of Sinepecten segonzaci. a: outer view of the left valve; b: same valve, detail of the ornamentation near the ventral margin of the disk; c: left valve, anterior margin of the disk; d: same valve, magnification of the antimarginal microsculpture; e: same valve, detail of ornamentation on the anterior edge of the anterior auricle; f: particles embedded on the disk surface of the right valve; on all figures arrow indicates the growth direction." httpUri="https://zenodo.org/record/171952/files/figure.png" pageId="11" pageNumber="12">Figure 11</figureCitation>
|
||
a). The interval between the ridges or lamellae covering the left valve is about
|
||
<quantity id="3374DB96B273FFCBF882F8A0D5C42C7A" box="[648,741,1821,1847]" metricMagnitude="-4" metricUnit="m" metricValue="1.0" pageId="11" pageNumber="12" unit="mm" value="0.1">0.1 mm</quantity>
|
||
near the ventral margin in juvenile specimens 2 and 3 (
|
||
<figureCitation id="6CB76AF6B273FFCBFB6AF8F8D6C02C12" box="[352,481,1861,1887]" captionStart="FIGURE 11" captionStartId="13.[264,367,1650,1674]" captionTargetBox="[297,1290,609,1622]" captionTargetId="figure@13.[297,1291,609,1623]" captionTargetPageId="13" captionText="FIGURE 11. SEM views of specimens 2 (a, b, e) and 4 (c, d, f) of Sinepecten segonzaci. a: outer view of the left valve; b: same valve, detail of the ornamentation near the ventral margin of the disk; c: left valve, anterior margin of the disk; d: same valve, magnification of the antimarginal microsculpture; e: same valve, detail of ornamentation on the anterior edge of the anterior auricle; f: particles embedded on the disk surface of the right valve; on all figures arrow indicates the growth direction." httpUri="https://zenodo.org/record/171952/files/figure.png" pageId="11" pageNumber="12">Figures 11</figureCitation>
|
||
a–b,e), and reaches
|
||
<quantity id="3374DB96B273FFCBF8D2F8F8D4162C12" box="[728,823,1861,1887]" metricMagnitude="-4" metricUnit="m" metricValue="2.0" pageId="11" pageNumber="12" unit="mm" value="0.2">0.2 mm</quantity>
|
||
in specimens 4 and 5 (
|
||
<figureCitation id="6CB76AF6B273FFCBFE54F8F8D3F72C12" box="[1118,1238,1861,1887]" captionStart="FIGURE 11" captionStartId="13.[264,367,1650,1674]" captionTargetBox="[297,1290,609,1622]" captionTargetId="figure@13.[297,1291,609,1623]" captionTargetPageId="13" captionText="FIGURE 11. SEM views of specimens 2 (a, b, e) and 4 (c, d, f) of Sinepecten segonzaci. a: outer view of the left valve; b: same valve, detail of the ornamentation near the ventral margin of the disk; c: left valve, anterior margin of the disk; d: same valve, magnification of the antimarginal microsculpture; e: same valve, detail of ornamentation on the anterior edge of the anterior auricle; f: particles embedded on the disk surface of the right valve; on all figures arrow indicates the growth direction." httpUri="https://zenodo.org/record/171952/files/figure.png" pageId="11" pageNumber="12">Figure 11</figureCitation>
|
||
c). The spacing between ridges tends to increase with growth and exceeds
|
||
<quantity id="3374DB96B274FFCCFE1EFEA1D34C2A7B" box="[1044,1133,284,310]" metricMagnitude="-4" metricUnit="m" metricValue="3.0" pageId="12" pageNumber="13" unit="mm" value="0.3">0.3 mm</quantity>
|
||
in the
|
||
<typeStatus id="2B37C8D1B274FFCCFEB6FEA1D2062A7B" box="[1212,1319,284,310]" pageId="12" pageNumber="13" type="holotype">holotype</typeStatus>
|
||
. The increase is not regular, as measurements have shown significant variations, obviously related to frequent growth disturbances. The components of ornamentation are shaped as ridges or lamellae depending on their location. Ridges form near the beak and in the middle of the disk (
|
||
<figureCitation id="6CB76AF6B274FFCCFBFBFE01D5442A9B" box="[497,613,444,470]" captionStart="FIGURE 11" captionStartId="13.[264,367,1650,1674]" captionTargetBox="[297,1290,609,1622]" captionTargetId="figure@13.[297,1291,609,1623]" captionTargetPageId="13" captionText="FIGURE 11. SEM views of specimens 2 (a, b, e) and 4 (c, d, f) of Sinepecten segonzaci. a: outer view of the left valve; b: same valve, detail of the ornamentation near the ventral margin of the disk; c: left valve, anterior margin of the disk; d: same valve, magnification of the antimarginal microsculpture; e: same valve, detail of ornamentation on the anterior edge of the anterior auricle; f: particles embedded on the disk surface of the right valve; on all figures arrow indicates the growth direction." httpUri="https://zenodo.org/record/171952/files/figure.png" pageId="12" pageNumber="13">Figure 11</figureCitation>
|
||
b), both places where growth rate is high. Lamellae form in the disk periphery (
|
||
<figureCitation id="6CB76AF6B274FFCCFBE4FE59D5412AB3" box="[494,608,484,510]" captionStart="FIGURE 11" captionStartId="13.[264,367,1650,1674]" captionTargetBox="[297,1290,609,1622]" captionTargetId="figure@13.[297,1291,609,1623]" captionTargetPageId="13" captionText="FIGURE 11. SEM views of specimens 2 (a, b, e) and 4 (c, d, f) of Sinepecten segonzaci. a: outer view of the left valve; b: same valve, detail of the ornamentation near the ventral margin of the disk; c: left valve, anterior margin of the disk; d: same valve, magnification of the antimarginal microsculpture; e: same valve, detail of ornamentation on the anterior edge of the anterior auricle; f: particles embedded on the disk surface of the right valve; on all figures arrow indicates the growth direction." httpUri="https://zenodo.org/record/171952/files/figure.png" pageId="12" pageNumber="13">Figure 11</figureCitation>
|
||
e) and near the limits between disk and auricles, both places where growth rate decreases. Anyway, both ridges and lamellae represent a relative slowing of growth rate as evidenced in SEM views by the bunching up of growth lines on them. SEM observation also allows clarification of the details of the antimarginal microsculpture, which is superimposed on the ornamentation. In the juvenile, extremely fine and low antimarginal riblets are arranged regularly along the intervals between the commarginal ridges (
|
||
<figureCitation id="6CB76AF6B274FFCCF80DFD69D55A29A3" box="[519,635,724,750]" captionStart="FIGURE 11" captionStartId="13.[264,367,1650,1674]" captionTargetBox="[297,1290,609,1622]" captionTargetId="figure@13.[297,1291,609,1623]" captionTargetPageId="13" captionText="FIGURE 11. SEM views of specimens 2 (a, b, e) and 4 (c, d, f) of Sinepecten segonzaci. a: outer view of the left valve; b: same valve, detail of the ornamentation near the ventral margin of the disk; c: left valve, anterior margin of the disk; d: same valve, magnification of the antimarginal microsculpture; e: same valve, detail of ornamentation on the anterior edge of the anterior auricle; f: particles embedded on the disk surface of the right valve; on all figures arrow indicates the growth direction." httpUri="https://zenodo.org/record/171952/files/figure.png" pageId="12" pageNumber="13">Figure 11</figureCitation>
|
||
b–e). The riblets distally cross the ridges, on which they induce a regular pattern of closeset thickenings (
|
||
<figureCitation id="6CB76AF6B274FFCCF96CFD41D4FF285B" box="[870,990,764,790]" captionStart="FIGURE 11" captionStartId="13.[264,367,1650,1674]" captionTargetBox="[297,1290,609,1622]" captionTargetId="figure@13.[297,1291,609,1623]" captionTargetPageId="13" captionText="FIGURE 11. SEM views of specimens 2 (a, b, e) and 4 (c, d, f) of Sinepecten segonzaci. a: outer view of the left valve; b: same valve, detail of the ornamentation near the ventral margin of the disk; c: left valve, anterior margin of the disk; d: same valve, magnification of the antimarginal microsculpture; e: same valve, detail of ornamentation on the anterior edge of the anterior auricle; f: particles embedded on the disk surface of the right valve; on all figures arrow indicates the growth direction." httpUri="https://zenodo.org/record/171952/files/figure.png" pageId="12" pageNumber="13">Figure 11</figureCitation>
|
||
e). When the ridges turn to lamellae, these thickenings become sharper and higher distally (
|
||
<figureCitation id="6CB76AF6B274FFCCF9F7FC99D34E2873" box="[1021,1135,804,830]" captionStart="FIGURE 11" captionStartId="13.[264,367,1650,1674]" captionTargetBox="[297,1290,609,1622]" captionTargetId="figure@13.[297,1291,609,1623]" captionTargetPageId="13" captionText="FIGURE 11. SEM views of specimens 2 (a, b, e) and 4 (c, d, f) of Sinepecten segonzaci. a: outer view of the left valve; b: same valve, detail of the ornamentation near the ventral margin of the disk; c: left valve, anterior margin of the disk; d: same valve, magnification of the antimarginal microsculpture; e: same valve, detail of ornamentation on the anterior edge of the anterior auricle; f: particles embedded on the disk surface of the right valve; on all figures arrow indicates the growth direction." httpUri="https://zenodo.org/record/171952/files/figure.png" pageId="12" pageNumber="13">Figure 11</figureCitation>
|
||
d).
|
||
</paragraph>
|
||
<caption id="A0F326FBB274FFCCFB02FA9AD5E42E84" httpUri="https://zenodo.org/record/171951/files/figure.png" pageId="12" pageNumber="13" targetBox="[265,1320,884,1303]" targetPageId="12">
|
||
<paragraph id="F4337673B274FFCCFB02FA9AD5E42E84" blockId="12.[264,1323,1319,1481]" pageId="12" pageNumber="13">
|
||
<emphasis id="C6F8AA61B274FFCCFB02FA9AD6BC2E72" bold="true" box="[264,413,1319,1343]" pageId="12" pageNumber="13">FIGURE 10.</emphasis>
|
||
Coiling of dorsal edge of anterior auricle and of outer ligament insertion. Left: interior view of right valve anterior auricle (not exactly to scale: height of outer ligament insertion oversized). Right: proximal (A) and distal (B) sections of bivalve shell through anterior auricle. aa: anterior auricle; bn: byssal notch; h: hinge; lv: left valve; oli: outer ligament insertion; ri: resilium insertion (inner ligament); rv: right valve.
|
||
</paragraph>
|
||
</caption>
|
||
<paragraph id="F4337673B274FFCDFB32FA4AD492296B" blockId="12.[264,1323,1527,1874]" lastBlockId="13.[264,1323,284,550]" lastPageId="13" lastPageNumber="14" pageId="12" pageNumber="13">
|
||
<emphasis id="C6F8AA61B274FFCCFB32FA4AD59B2D5C" bold="true" box="[312,698,1527,1553]" pageId="12" pageNumber="13">Ornamentation of right valve:</emphasis>
|
||
Juvenile specimens 2 and 3 illustrate the prismatic stage. Their right valve is externally covered with a layer of calcite prisms extending to the disk margin. On specimens 4 and 5, the prismatic stage is a little shorter than on the
|
||
<typeStatus id="2B37C8D1B274FFCCFB02F9CDD6522DC7" box="[264,371,1648,1674]" pageId="12" pageNumber="13" type="holotype">holotype</typeStatus>
|
||
:
|
||
<quantity id="3374DB96B274FFCCFB77F9CDD6D42DC7" box="[381,501,1648,1674]" metricMagnitude="-3" metricUnit="m" metricValue="8.5" metricValueMax="9.0" metricValueMin="8.0" pageId="12" pageNumber="13" unit="mm" value="8.5" valueMax="9.0" valueMin="8.0">8 to 9 mm</quantity>
|
||
for specimen 4 and
|
||
<quantity id="3374DB96B274FFCCF8EBF9CDD4042DC7" box="[737,805,1648,1674]" metricMagnitude="-3" metricUnit="m" metricValue="9.0" pageId="12" pageNumber="13" unit="mm" value="9.0">9 mm</quantity>
|
||
for specimen 5, versus
|
||
<quantity id="3374DB96B274FFCCFE30F9CDD3AD2DC7" box="[1082,1164,1648,1674]" metricMagnitude="-2" metricUnit="m" metricValue="1.0" pageId="12" pageNumber="13" unit="mm" value="10.0">10 mm</quantity>
|
||
for specimen 6. The array of prisms forms a pattern of recurrent, commarginal sequences (
|
||
<figureCitation id="6CB76AF6B274FFCCFEA7F925D2352DFF" box="[1197,1300,1688,1714]" captionStart="FIGURE 9" captionStartId="11.[264,368,1532,1556]" captionTargetBox="[264,1322,430,1508]" captionTargetId="figure@11.[264,1323,426,1508]" captionTargetPageId="11" captionText="FIGURE 9. SEM views of specimens 2 (a, c) and 4 (b, d – f) of Sinepecten segonzaci. a: outer view of the anterodorsal region of the right valve; b: inner view of the anterodorsal part of the right valve; c: magnification of the outer layer of (a) near the ventral margin; d: calcite laths of the foliated structure; e: inner view of the beak region of the left valve (see Figure 12); f: hinge surface, magnification as in (d)." httpUri="https://zenodo.org/record/171950/files/figure.png" pageId="12" pageNumber="13">Figure 9</figureCitation>
|
||
c) corresponding to the concentric prismatic structure described by Schein (1989).
|
||
<collectingCountry id="8C9B36E3B274FFCCFEFAF97DD2302D97" box="[1264,1297,1728,1754]" name="American Samoa" pageId="12" pageNumber="13">As</collectingCountry>
|
||
a consequence of this superficial microstructure, the right valve seems macroscopically to be unornamented in the prismatic stage. However, it displays weak and narrow commarginal flutings derived from the prismatic microstructure, and several irregular commarginal undulations (
|
||
<figureCitation id="6CB76AF6B275FFCDF84EFEA1D58B2A7B" box="[580,682,284,310]" captionStart="FIGURE 8" captionStartId="10.[264,368,1510,1534]" captionTargetBox="[264,1323,969,1484]" captionTargetId="figure@10.[264,1323,969,1484]" captionTargetPageId="10" captionText="FIGURE 8. Juvenile paratypes of Sinepecten segonzaci. a: specimen 2, lower (right) side of the anterodorsal region; b: lower side of specimen 3 showing the marginal apron of the right valve (arrows)." httpUri="https://zenodo.org/record/171949/files/figure.png" pageId="13" pageNumber="14">Figure 8</figureCitation>
|
||
a).
|
||
<collectingCountry id="8C9B36E3B275FFCDF8DBFEA1D5D02A7B" box="[721,753,284,310]" name="American Samoa" pageId="13" pageNumber="14">As</collectingCountry>
|
||
in the
|
||
<typeStatus id="2B37C8D1B275FFCDF94CFEA1D4912A7B" box="[838,944,284,310]" pageId="13" pageNumber="14" type="holotype">holotype</typeStatus>
|
||
, the specimens 4 and 5 develop on their right valve the same ornamentation as on the left one after the prismatic stage. The right valve ornamentation is thus late when compared to the left valve. The delay is longer on the disk than on the auricles, and in the latter, the anterior auricle is the more advanced. This is illustrated by the juvenile specimen 2 with an anterior auricle displaying relatively sharp commarginal ridges (
|
||
<figureCitation id="6CB76AF6B275FFCDF840FE59D58E2AB3" box="[586,687,484,510]" captionStart="FIGURE 8" captionStartId="10.[264,368,1510,1534]" captionTargetBox="[264,1323,969,1484]" captionTargetId="figure@10.[264,1323,969,1484]" captionTargetPageId="10" captionText="FIGURE 8. Juvenile paratypes of Sinepecten segonzaci. a: specimen 2, lower (right) side of the anterodorsal region; b: lower side of specimen 3 showing the marginal apron of the right valve (arrows)." httpUri="https://zenodo.org/record/171949/files/figure.png" pageId="13" pageNumber="14">Figure 8</figureCitation>
|
||
a). The ornamented part of the auricle lies outside the proximal prismatic area, which is very reduced (
|
||
<figureCitation id="6CB76AF6B275FFCDF934FDB1D484296B" box="[830,933,524,550]" captionStart="FIGURE 7" captionStartId="9.[264,368,1088,1112]" captionTargetBox="[281,1306,705,1043]" captionTargetId="figure@9.[264,1323,689,1061]" captionTargetPageId="9" captionText="FIGURE 7. Right valve outline and prismatic calcite extent through ontogeny. The five specimens (2 to 6) are drawn at the same size to emphasize the change in outline from prismatic stage (dark grey) to adult. Extent of prismatic calcite on anterior auricle (AA) indicated only on sp. 2." httpUri="https://zenodo.org/record/171948/files/figure.png" pageId="13" pageNumber="14">Figure 7</figureCitation>
|
||
).
|
||
</paragraph>
|
||
<caption id="A0F326FBB275FFCDFB02F9CFD64F2C7B" httpUri="https://zenodo.org/record/171952/files/figure.png" pageId="13" pageNumber="14" targetBox="[297,1290,609,1622]" targetPageId="13">
|
||
<paragraph id="F4337673B275FFCDFB02F9CFD64F2C7B" blockId="13.[264,1325,1650,1846]" pageId="13" pageNumber="14">
|
||
<emphasis id="C6F8AA61B275FFCDFB02F9CFD6B62DC7" bold="true" box="[264,407,1650,1674]" pageId="13" pageNumber="14">FIGURE 11.</emphasis>
|
||
SEM views of specimens 2 (a, b, e) and 4 (c, d, f) of
|
||
<taxonomicName id="338C0DF0B275FFCDF9EFF9CFD3EB2DC4" box="[997,1226,1650,1673]" class="Bivalvia" family="Pectinidae" genus="Sinepecten" kingdom="Animalia" order="Pectinoida" pageId="13" pageNumber="14" phylum="Mollusca" rank="species" species="segonzaci">
|
||
<emphasis id="C6F8AA61B275FFCDF9EFF9CFD3EB2DC4" box="[997,1226,1650,1673]" italics="true" pageId="13" pageNumber="14">Sinepecten segonzaci</emphasis>
|
||
</taxonomicName>
|
||
. a: outer view of the left valve; b: same valve, detail of the ornamentation near the ventral margin of the disk; c: left valve, anterior margin of the disk; d: same valve, magnification of the antimarginal microsculpture; e: same valve, detail of ornamentation on the anterior edge of the anterior auricle; f: particles embedded on the disk surface of the right valve; on all figures arrow indicates the growth direction.
|
||
</paragraph>
|
||
</caption>
|
||
<caption id="A0F326FBB276FFCEFB02FC1FD4572F2A" httpUri="https://zenodo.org/record/171953/files/figure.png" pageId="14" pageNumber="15" targetBox="[284,1307,346,887]" targetPageId="14">
|
||
<paragraph id="F4337673B276FFCEFB02FC1FD4572F2A" blockId="14.[264,1322,930,1127]" pageId="14" pageNumber="15">
|
||
<emphasis id="C6F8AA61B276FFCEFB02FC1FD6BB28F7" bold="true" box="[264,410,930,954]" pageId="14" pageNumber="15">FIGURE 12.</emphasis>
|
||
Muscle insertions, microstructures exposed and hydrothermal venting influence on the internal shell surface of specimen 4. A: left valve; A’: umbonopallial section; B: right valve; ai: adductor insertion; gsi: gill suspensor insertion; pmi: pallial muscle insertion; pri: pedal retractor insertion; ri: resilium insertion. 1: foliated calcite; 2: aragonitic middle shell layer; 3 to 5: myostracal aragonite, prismatic in adductor myostracum (3) and dorsal pallial muscle insertion (4), spherulitic in pallial line (5); 6: resilium fibrous aragonite.
|
||
</paragraph>
|
||
</caption>
|
||
<paragraph id="F4337673B276FFCEFB32FB28D4E52E02" blockId="14.[264,1323,1173,1879]" pageId="14" pageNumber="15">
|
||
<emphasis id="C6F8AA61B276FFCEFB32FB28D5352FE2" bold="true" box="[312,532,1173,1199]" pageId="14" pageNumber="15">Aragonitic layer:</emphasis>
|
||
On the inner face of both valves, there is an aragonitic layer outcropping, which is limited dorsally by the distal edge of the foliated calcite inner layer and ventrally by the pallial line (
|
||
<figureCitation id="6CB76AF6B276FFCEF8ADFB58D4022FB2" box="[679,803,1253,1279]" captionStart="FIGURE 12" captionStartId="14.[264,368,930,954]" captionTargetBox="[284,1307,346,887]" captionTargetId="figure@14.[264,1323,326,906]" captionTargetPageId="14" captionText="FIGURE 12. Muscle insertions, microstructures exposed and hydrothermal venting influence on the internal shell surface of specimen 4. A: left valve; A’: umbonopallial section; B: right valve; ai: adductor insertion; gsi: gill suspensor insertion; pmi: pallial muscle insertion; pri: pedal retractor insertion; ri: resilium insertion. 1: foliated calcite; 2: aragonitic middle shell layer; 3 to 5: myostracal aragonite, prismatic in adductor myostracum (3) and dorsal pallial muscle insertion (4), spherulitic in pallial line (5); 6: resilium fibrous aragonite." httpUri="https://zenodo.org/record/171953/files/figure.png" pageId="14" pageNumber="15">Figure 12</figureCitation>
|
||
). Its radiate organisation is obvious, with narrow bands radiating from the beak. SEM observation shows that the bands are alternatively light (more emissive) and dark (less emissive).
|
||
</paragraph>
|
||
<paragraph id="F4337673B276FFCEFB32FAE0D4EE2D92" blockId="14.[264,1323,1173,1879]" pageId="14" pageNumber="15">
|
||
<emphasis id="C6F8AA61B276FFCEFB32FAE0D6C52E3A" bold="true" box="[312,484,1373,1399]" pageId="14" pageNumber="15">Muscle scars:</emphasis>
|
||
The adductor muscle scar is different in the right and the left valves (
|
||
<figureCitation id="6CB76AF6B276FFCEFB1AFA38D6A62ED2" box="[272,391,1413,1439]" captionStart="FIGURE 12" captionStartId="14.[264,368,930,954]" captionTargetBox="[284,1307,346,887]" captionTargetId="figure@14.[264,1323,326,906]" captionTargetPageId="14" captionText="FIGURE 12. Muscle insertions, microstructures exposed and hydrothermal venting influence on the internal shell surface of specimen 4. A: left valve; A’: umbonopallial section; B: right valve; ai: adductor insertion; gsi: gill suspensor insertion; pmi: pallial muscle insertion; pri: pedal retractor insertion; ri: resilium insertion. 1: foliated calcite; 2: aragonitic middle shell layer; 3 to 5: myostracal aragonite, prismatic in adductor myostracum (3) and dorsal pallial muscle insertion (4), spherulitic in pallial line (5); 6: resilium fibrous aragonite." httpUri="https://zenodo.org/record/171953/files/figure.png" pageId="14" pageNumber="15">Figure 12</figureCitation>
|
||
). On the right valve, the adductor scar is beanshaped, with two adjacent parts placed one above the other. It is clearly defined, and the size of the two parts is equivalent. On the left valve, the scar is larger and less clear, but three subequivalent parts seem to be outlined. Two of them are posterior and superposed, and the third scar lies anterior to the ventral one. All three correspond to the muscular sectors responsible for the three basic functions in byssally attached pectinids: rapid adduction of valves (“quick” striated muscle), slow adduction (“catch” smooth muscle), and byssal attachment (byssus and foot retractor). Unfortunately, given the poor preservation of specimens, it was not possible to precisely identify where the corresponding muscles inserted.
|
||
</paragraph>
|
||
<paragraph id="F4337673B276FFCFFB32F950D5A52A13" blockId="14.[264,1323,1173,1879]" lastBlockId="15.[264,1324,284,1870]" lastPageId="15" lastPageNumber="16" pageId="14" pageNumber="15">
|
||
<emphasis id="C6F8AA61B276FFCEFB32F950D6F72C4A" bold="true" box="[312,470,1773,1799]" pageId="14" pageNumber="15">Larval shell:</emphasis>
|
||
The larval shell, which was either destroyed by corrosion, or coated with ferromanganese deposits could not be observed. Some remains on the left valve of specimen 2 allow us to estimate that the anteroposterior diameter is about 215 µm as in the larval shell of
|
||
<taxonomicName id="338C0DF0B277FFCFF805FEA1D42B2A78" box="[527,778,284,309]" class="Bivalvia" family="Propeamussiidae" genus="Bathypecten" higherTaxonomySource="CoL" kingdom="Animalia" order="Pectinida" pageId="15" pageNumber="16" phylum="Mollusca" rank="species" species="vulcani">
|
||
<emphasis id="C6F8AA61B277FFCFF805FEA1D42B2A78" box="[527,778,284,309]" italics="true" pageId="15" pageNumber="16">Bathypecten vulcani</emphasis>
|
||
</taxonomicName>
|
||
which has a nonplanktotrophic
|
||
<typeStatus id="2B37C8D1B277FFCFFEC6FEA1D3DF2A7B" box="[1228,1278,284,310]" pageId="15" pageNumber="16">type</typeStatus>
|
||
of development (
|
||
<bibRefCitation id="901D0B82B277FFCFFBA5FEF9D5562A13" author="Roux" box="[431,631,324,350]" pageId="15" pageNumber="26" refString="Roux M., Rio M, Schein E., Lutz R. A., Fritz L. W. & Ragone L. M. (1989) Mesures in situ de la croissance des bivalves et des vestimentiferes et de la corrosion des coquilles au site hydrothermal de 13 ° N (dorsale du Pacifique oriental). Comptes Rendus de l'Academie des Sciences Paris, 308, serie III, 121 - 127." type="journal article" year="1989">Roux et al. 1989</bibRefCitation>
|
||
).
|
||
</paragraph>
|
||
<paragraph id="F4337673B277FFCFFB32FED1D5D72AE3" blockId="15.[264,1324,284,1870]" pageId="15" pageNumber="16">
|
||
In life habit,
|
||
<taxonomicName id="338C0DF0B277FFCFFBEEFED1D55D2AC8" box="[484,636,364,389]" class="Bivalvia" family="Pectinidae" genus="Sinepecten" kingdom="Animalia" order="Pectinoida" pageId="15" pageNumber="16" phylum="Mollusca" rank="species" species="segonzaci">
|
||
<emphasis id="C6F8AA61B277FFCFFBEEFED1D55D2AC8" box="[484,636,364,389]" italics="true" pageId="15" pageNumber="16">S. segonzaci</emphasis>
|
||
</taxonomicName>
|
||
is byssally attached, and its valve lower flat valve is adpressed against the substrate (
|
||
<figureCitation id="6CB76AF6B277FFCFF88AFE29D5C62AE3" box="[640,743,404,430]" captionStart="FIGURE 5" captionStartId="7.[264,367,1239,1263]" captionTargetBox="[284,1309,353,1215]" captionTargetId="figure@7.[264,1323,329,1229]" captionTargetPageId="7" captionText="FIGURE 5. Life posture in Sinepecten segonzaci n. gen., n. sp. with byssal fixation compared in juveniles (sp. 2 – 4) and in the largest adult specimen (sp. 6), i. e. the holotype. a: parasagittal sections of bivalve specimens: tight byssal fixation fitting the lower (right) valve to the substrate; b: external view of anterodorsal region of shell underside. Inner surface of upper (left) valve (grey) appears behind byssal notch of lower valve; c: parasagittal section along xy showing byssus emerging from byssal notch. aa: anterior auricle; bf: byssal fasciole; bn: byssal notch; bs: byssal sinus. Arrows in (b) and (c) indicating relative growth direction of dorsal and ventral edges of byssal notch. On all figures, thick outline corresponding to lower (right) valve, coarse stipple to shell interior, and fine stipple to inner face of left valve." httpUri="https://zenodo.org/record/171946/files/figure.png" pageId="15" pageNumber="16">Figure 5</figureCitation>
|
||
).
|
||
</paragraph>
|
||
<paragraph id="F4337673B277FFCFFB32FE06D410298B" blockId="15.[264,1324,284,1870]" pageId="15" pageNumber="16">
|
||
<emphasis id="C6F8AA61B277FFCFFB32FE06D5BF2A98" bold="true" box="[312,670,443,469]" pageId="15" pageNumber="16">Hydrothermal environment:</emphasis>
|
||
The five specimens of the
|
||
<typeStatus id="2B37C8D1B277FFCFF9E6FE01D33E2A9B" box="[1004,1055,444,470]" pageId="15" pageNumber="16">type</typeStatus>
|
||
series of
|
||
<taxonomicName id="338C0DF0B277FFCFFE9DFE01D20B2A98" box="[1175,1322,444,469]" class="Bivalvia" family="Pectinidae" genus="Sinepecten" kingdom="Animalia" order="Pectinoida" pageId="15" pageNumber="16" phylum="Mollusca" rank="species" species="segonzaci">
|
||
<emphasis id="C6F8AA61B277FFCFFE9DFE01D20B2A98" box="[1175,1322,444,469]" italics="true" pageId="15" pageNumber="16">S. segonzaci</emphasis>
|
||
</taxonomicName>
|
||
were collected at the Barnacle vent site (PACMANUS area, Field E) on glassy basalt, among sessile barnacles, where the temperature ranged between 2.8°C at the periphery of hydrothermal fields and about 40°C in vent fluid. This site is a group of small chimneys from
|
||
<quantity id="3374DB96B277FFCFFB40FDE1D692293B" box="[330,435,604,630]" metricMagnitude="0" metricUnit="m" metricValue="7.0" metricValueMax="8.0" metricValueMin="6.0" pageId="15" pageNumber="16" unit="m" value="7.0" valueMax="8.0" valueMin="6.0">6 to 8 m</quantity>
|
||
height, either inactive or emitting a black fluid (260 to 270°C). The vent fauna is established around these edifices, between cracks emitting a transparent fluid measured at 5 to 40°C (
|
||
<bibRefCitation id="901D0B82B277FFCFF816FD11D405298B" author="Hashimoto" box="[540,804,684,710]" lastPageId="15" lastPageNumber="26" pageId="15" pageNumber="25" refString="Hashimoto J., Ohta S., Fiala-Medioni A., Auzende J. M., Kojima S., Segonzac M., Fujiwara Y., Hunt J. C., Gena K., Miura T., Kikushi T., Yamagushi T., Toda T., Chiba H., Tsuchida S., Ishibashi J., Henry K., Zbiden M., Pruski A., Inoue A., Kobayashi H., Birrien J. L., Naka J., Yamanaka T., Laporte C., Nishimura K., Yeats C., Malagun S., Kia P., Oyaizu M. & Katayama T. (1999) Hydrothermal vent communities in the Manus Basin, Papua New Guinea: Results of the BIOACCESS cruises ' 96 & ' 98. InterRidge News, 8 (2), 12 - 18." type="journal article" year="1999">Hashimoto et al. 1999</bibRefCitation>
|
||
).
|
||
</paragraph>
|
||
<paragraph id="F4337673B277FFCFFB32FD69D57C28C3" blockId="15.[264,1324,284,1870]" pageId="15" pageNumber="16">
|
||
Kai Kai site is one of the two large diffuse vent sites of the Field D where chimneys are absent but where there are large diffuse vents with cracks emitting strong shimmering water at 30°C (
|
||
<bibRefCitation id="901D0B82B277FFCFFBC9FC99D5F62873" author="Hashimoto" box="[451,727,804,830]" lastPageId="15" lastPageNumber="26" pageId="15" pageNumber="25" refString="Hashimoto J., Ohta S., Fiala-Medioni A., Auzende J. M., Kojima S., Segonzac M., Fujiwara Y., Hunt J. C., Gena K., Miura T., Kikushi T., Yamagushi T., Toda T., Chiba H., Tsuchida S., Ishibashi J., Henry K., Zbiden M., Pruski A., Inoue A., Kobayashi H., Birrien J. L., Naka J., Yamanaka T., Laporte C., Nishimura K., Yeats C., Malagun S., Kia P., Oyaizu M. & Katayama T. (1999) Hydrothermal vent communities in the Manus Basin, Papua New Guinea: Results of the BIOACCESS cruises ' 96 & ' 98. InterRidge News, 8 (2), 12 - 18." type="journal article" year="1999">Hashimoto et al. 1999</bibRefCitation>
|
||
). A single dead juvenile valve (specimen 1) was collected in a sediment area, at some tens of meters of the KaiKai vent site, and thus, outside of the vent influence.
|
||
</paragraph>
|
||
<paragraph id="F4337673B277FFCFFB32FC21D5392D9B" blockId="15.[264,1324,284,1870]" pageId="15" pageNumber="16">
|
||
The outer shell surface of the specimens shows the fingerprint of the hydrothermal environment in which they grew, i.e., an aggressive and unstable environment, with fluids rich in metal ions ready to precipitate over the shell. The specimens all had their upper (left) valve coated with a ferromanganese black deposit, thicker in umbonal area. The black deposit also affected the lower (right) valve, where it was thinner and less regularly distributed (
|
||
<figureCitation id="6CB76AF6B277FFCFFB9DFBD9D5202F33" box="[407,513,1124,1150]" captionStart="FIGURE 4" captionStartId="6.[264,367,1781,1805]" captionTargetBox="[266,1322,737,1738]" captionTargetId="figure@6.[264,1323,722,1754]" captionTargetPageId="6" captionText="FIGURE 4. Holotype of Sinepecten segonzaci. a: upper (left) valve; b: lower (right) valve; c: dorsal region of the right valve showing the anterodorsal margin of the disk (black arrow) slightly overlapping the anterior auricle (aa). White arrow indicating a sharp growth line (see text)." httpUri="https://zenodo.org/record/171945/files/figure.png" pageId="15" pageNumber="16">Figure 4</figureCitation>
|
||
). Damage to the shells increases with growth and size of the shell. When the individuals are small (specimens 2 and 3), the shell is blackened but its outer surface only is affected, and the outline is regular. In contrast, the valves of the larger specimens are affected on both sides, as the outer disturbances are reflected on the inner shell face. For example, specimens 4 and 5 are more or less deformed by a great number of bumps, and moreover the periphery of the disk is densely covered with countless particles which were trapped along the growing edge and became embedded into calcification (
|
||
<figureCitation id="6CB76AF6B277FFCFFB1AFAC1D6AA2EDB" box="[272,395,1404,1430]" captionStart="FIGURE 11" captionStartId="13.[264,367,1650,1674]" captionTargetBox="[297,1290,609,1622]" captionTargetId="figure@13.[297,1291,609,1623]" captionTargetPageId="13" captionText="FIGURE 11. SEM views of specimens 2 (a, b, e) and 4 (c, d, f) of Sinepecten segonzaci. a: outer view of the left valve; b: same valve, detail of the ornamentation near the ventral margin of the disk; c: left valve, anterior margin of the disk; d: same valve, magnification of the antimarginal microsculpture; e: same valve, detail of ornamentation on the anterior edge of the anterior auricle; f: particles embedded on the disk surface of the right valve; on all figures arrow indicates the growth direction." httpUri="https://zenodo.org/record/171952/files/figure.png" pageId="15" pageNumber="16">Figure 11</figureCitation>
|
||
f). On the left valve, the inner surface is densely scattered with marks resembling stretch marks; the inner surface of the right thinner valve is granular (
|
||
<figureCitation id="6CB76AF6B277FFCFFED6FA19D6092EAB" captionStart="FIGURE 12" captionStartId="14.[264,368,930,954]" captionTargetBox="[284,1307,346,887]" captionTargetId="figure@14.[264,1323,326,906]" captionTargetPageId="14" captionText="FIGURE 12. Muscle insertions, microstructures exposed and hydrothermal venting influence on the internal shell surface of specimen 4. A: left valve; A’: umbonopallial section; B: right valve; ai: adductor insertion; gsi: gill suspensor insertion; pmi: pallial muscle insertion; pri: pedal retractor insertion; ri: resilium insertion. 1: foliated calcite; 2: aragonitic middle shell layer; 3 to 5: myostracal aragonite, prismatic in adductor myostracum (3) and dorsal pallial muscle insertion (4), spherulitic in pallial line (5); 6: resilium fibrous aragonite." httpUri="https://zenodo.org/record/171953/files/figure.png" pageId="15" pageNumber="16">Figure 12</figureCitation>
|
||
). The thinness of the growing edge explains why the inner face reflects the incorporation of foreign particles on the outer face. The high density of particles along the ventral margin of specimens 4 and 5 reflects their density in the ambient seawater. Finally, in the
|
||
<typeStatus id="2B37C8D1B277FFCFFB5AF9F9D69B2D13" box="[336,442,1604,1630]" pageId="15" pageNumber="16" type="holotype">holotype</typeStatus>
|
||
, besides the black coatings, the shell is entirely distorted and seems even to have undergone a torsion, when compared to the younger specimens. This is obviously induced by its adaptation to the irregular substrate, but a reaction to the toxicity of fluids could also be involved.
|
||
</paragraph>
|
||
<paragraph id="F4337673B277FFCFFB32F959D4422C03" blockId="15.[264,1324,284,1870]" pageId="15" pageNumber="16">
|
||
<collectingCountry id="8C9B36E3B277FFCFFB32F959D6792DB3" box="[312,344,1764,1790]" name="American Samoa" pageId="15" pageNumber="16">As</collectingCountry>
|
||
a result of their small size and of the black ferromanganese deposits covering the shells (as well as external surfaces of the barnacles), these pectinids are not easily visible, since they are attached to a black basaltic substrate.
|
||
</paragraph>
|
||
</subSubSection>
|
||
</treatment>
|
||
</document> |