147 lines
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147 lines
15 KiB
XML
<document ID-DOI="http://dx.doi.org/10.3897/zse.90.8323" ID-GBIF-Dataset="3c83d5da-822a-439c-897a-7569e82c4ebc" ID-GBIF-Taxon="127887878" ID-Pensoft-Pub="1860-0743-2" LSID="urn:lsid:zoobank.org:act:BEDD6D75-67E5-4141-901B-E28EBEFD1941" ModsDocAuthor="" ModsDocDate="2014" ModsDocID="1860-0743-2" ModsDocOrigin="Zoosystematics and Evolution 90 (2)" ModsDocTitle="“TUBULAR GILLS” Extreme gill modification in the Thyasiroidea with the description of Ochetoctena tomasi gen. et sp. nov. (Bivalvia: Thyasiroidea)" checkinTime="1418151329697" checkinUser="pensoft" docAuthor="Oliver, P. Graham" docDate="2014" docId="2675A941C5DCCD3D6ED6BFD148BC6B79" docLanguage="en" docName="ZoosystEvol 90(2): 121-132" docOrigin="Zoosystematics and Evolution 90 (2)" docSource="http://dx.doi.org/10.3897/zse.90.8323" docTitle="Ochetoctena tomasi Oliver, 2014, sp. nov." docType="treatment" docUuid="BEDD6D75-67E5-4141-901B-E28EBEFD1941" docUuidSource="ZooBank" docVersion="6" lastPageId="6" lastPageNumber="127" masterDocId="FFE91242FFE258602A2AFFDA1748D57F" masterDocTitle="" TUBULAR GILLS " Extreme gill modification in the Thyasiroidea with the description of Ochetoctena tomasi gen. et sp. nov. (Bivalvia: Thyasiroidea)" masterLastPageNumber="132" masterPageNumber="121" pageId="5" pageNumber="126" updateTime="1643677703768" updateUser="ExternalLinkService">
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<mods:mods xmlns:mods="http://www.loc.gov/mods/v3">
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<mods:titleInfo>
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<mods:title>" TUBULAR GILLS " Extreme gill modification in the Thyasiroidea with the description of Ochetoctena tomasi gen. et sp. nov. (Bivalvia: Thyasiroidea)</mods:title>
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</mods:titleInfo>
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<mods:name type="personal">
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<mods:role>
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<mods:roleTerm>Author</mods:roleTerm>
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</mods:role>
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<mods:namePart>Oliver, P. Graham</mods:namePart>
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</mods:name>
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<mods:typeOfResource>text</mods:typeOfResource>
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<mods:relatedItem type="host">
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<mods:titleInfo>
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<mods:title>Zoosystematics and Evolution</mods:title>
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</mods:titleInfo>
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<mods:part>
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<mods:date>2014</mods:date>
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<mods:detail type="volume">
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<mods:number>90</mods:number>
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</mods:detail>
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<mods:detail type="issue">
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<mods:number>2</mods:number>
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</mods:detail>
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<mods:extent unit="page">
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<mods:start>121</mods:start>
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<mods:end>132</mods:end>
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</mods:extent>
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</mods:part>
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</mods:relatedItem>
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<mods:location>
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<mods:url>http://dx.doi.org/10.3897/zse.90.8323</mods:url>
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</mods:location>
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<mods:classification>journal article</mods:classification>
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<mods:identifier type="DOI">http://dx.doi.org/10.3897/zse.90.8323</mods:identifier>
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<mods:identifier type="Pensoft-Pub">1860-0743-2</mods:identifier>
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<mods:identifier type="ZooBank">C7680624-DD5D-4488-8387-171823EEC0AF</mods:identifier>
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</mods:mods>
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<treatment ID-GBIF-Taxon="127887878" LSID="urn:lsid:zoobank.org:act:BEDD6D75-67E5-4141-901B-E28EBEFD1941" httpUri="http://treatment.plazi.org/id/2675A941C5DCCD3D6ED6BFD148BC6B79" lastPageId="6" lastPageNumber="127" pageId="5" pageNumber="126">
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<subSubSection pageId="5" pageNumber="126" type="multiple">
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<paragraph pageId="5" pageNumber="126">
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<pageBreakToken pageId="5" pageNumber="126" start="start">Taxon</pageBreakToken>
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classification Animalia Veneroida Thyasiridae
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</paragraph>
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</subSubSection>
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<subSubSection pageId="5" pageNumber="126" type="nomenclature">
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<paragraph pageId="5" pageNumber="126">
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<taxonomicName LSID="http://zoobank.org/BEDD6D75-67E5-4141-901B-E28EBEFD1941" class="Bivalvia" family="Thyasiridae" genus="Ochetoctena" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Ochetoctena tomasi" order="Lucinida" pageId="5" pageNumber="126" phylum="Mollusca" rank="species" species="tomasi">Ochetoctena tomasi</taxonomicName>
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<taxonomicNameLabel pageId="5" pageNumber="126">sp. nov.</taxonomicNameLabel>
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</paragraph>
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</subSubSection>
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<subSubSection pageId="5" pageNumber="126" type="reference_group">
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<paragraph pageId="5" pageNumber="126">
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<taxonomicName class="Bivalvia" family="Thyasiridae" genus="Thyasira" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Thyasira" order="Lucinida" pageId="5" pageNumber="126" phylum="Mollusca" rank="genus">Thyasira</taxonomicName>
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n. sp. Regab - Rodrigues & Duperron, 2011.
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</paragraph>
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</subSubSection>
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<subSubSection pageId="5" pageNumber="126" type="material examined">
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<paragraph pageId="5" pageNumber="126">Material examined.</paragraph>
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<paragraph pageId="5" pageNumber="126">
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2 specimens (1 broken) in ethanol. Regab Pockmark, Gulf of Guinea, West Africa, RV Meteor GUINECO cruise, M76/3, Dive 215,
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<geoCoordinate direction="south" orientation="latitude" precision="9" value="-5.7973332">05°47.84' S</geoCoordinate>
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.
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<geoCoordinate direction="east" orientation="longitude" precision="9" value="9.710667">09°42.64' E</geoCoordinate>
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. 3167m
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</paragraph>
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<paragraph pageId="5" pageNumber="126">Holotype, entire shell from above, NMW.Z.2014.014.00001</paragraph>
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</subSubSection>
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<subSubSection lastPageId="6" lastPageNumber="127" pageId="5" pageNumber="126" type="description of holotype">
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<paragraph pageId="5" pageNumber="126">Description of holotype.</paragraph>
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<paragraph lastPageId="6" lastPageNumber="127" pageId="5" pageNumber="126">
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14.4 mm long, 13.4 mm high, 4.3 mm half t. Equivalve, Equilateral. Outline subcircular. Anterior dorsal (lunule) margin concave, lunule slightly depressed, ovate, smooth, demarcated by a low ridge. Posterior dorsal (escutcheon) margin almost straight; escutcheon narrow, very shallow,
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<pageBreakToken pageId="6" pageNumber="127" start="start">auricle</pageBreakToken>
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lacking. Posterior ventral margin weakly indented corresponding with a distinct but shallow posterior sulcus. Median area slightly flattened corresponding with slightly straightened ventral margin. Anterior ventral and anterior a continuous broad curve. Ligament prominent but deeply sunken, about half the length of the escutcheon. Hinge edentulous. Sculpture of irregular commarginal lines and growth stops, overall with microscopic conical, calcareous spines emerging through the periostracum, these as isolated individuals, in small clumps or connected by weak sub-concentric ridges. Periostracum relatively thick, brown in colour, shell white. Muscle scars prominent, anterior adductor scar elongate not diverging from the broad pallial line; posterior adductor scar oval.
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</paragraph>
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</subSubSection>
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<subSubSection pageId="6" pageNumber="127" type="anatomy">
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<paragraph pageId="6" pageNumber="127">Anatomy.</paragraph>
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<paragraph pageId="6" pageNumber="127">Mantle edge thick, free except for a junction demarcating the posterior aperture. Foot large, vermiform, toe elongate, heel very small. Lateral pouches large, multi-lobed, lobes cuboid. Ctenidium of two demibranchs, the outer about half the length of the inner; both with fully reflected filaments, these of Type 5T, composed of tubules fused to a median tube with only a small dorsal inter lamellar space.</paragraph>
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</subSubSection>
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<subSubSection pageId="6" pageNumber="127" type="etymology">
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<paragraph pageId="6" pageNumber="127">Etymology.</paragraph>
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<paragraph pageId="6" pageNumber="127">Named for my son Tomas.</paragraph>
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</subSubSection>
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<subSubSection pageId="6" pageNumber="127" type="discussion">
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<paragraph pageId="6" pageNumber="127">Discussion.</paragraph>
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<paragraph pageId="6" pageNumber="127">
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The shell of
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<taxonomicName class="Bivalvia" family="Thyasiridae" genus="Ochetoctena" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Ochetoctena" order="Lucinida" pageId="6" pageNumber="127" phylum="Mollusca" rank="genus">Ochetoctena</taxonomicName>
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has a weak posterior sulcus and the escutcheon is excavated but lacks any auricle to support the sunken ligament. In this it differs from
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<taxonomicName class="Bivalvia" family="Thyasiridae" genus="Thyasira" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Thyasira" order="Lucinida" pageId="6" pageNumber="127" phylum="Mollusca" rank="genus">Thyasira</taxonomicName>
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sensu stricto where there is a well developed auricle and from
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<taxonomicName class="Bivalvia" family="Thyasiridae" genus="Conchocele" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Conchocele" order="Lucinida" pageId="6" pageNumber="127" phylum="Mollusca" rank="genus">Conchocele</taxonomicName>
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which is oblique with a very strong posterior sulcus. Species lacking an auricle are often placed in the genus
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<taxonomicName class="Bivalvia" family="Thyasiridae" genus="Parathyasira" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Parathyasira" order="Lucinida" pageId="6" pageNumber="127" phylum="Mollusca" rank="genus">Parathyasira</taxonomicName>
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(
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<bibRefCitation author="Oliver, PG" journalOrPublisher="Studies in marine biodiversity and systematics from the National Museum of Wales, Biomor reports" pageId="7" pageNumber="128" pagination="1 - 73" title="The Thyasiridae of the British continental shelf and north sea oilfields." volume="3" year="2002">Oliver and Killeen 2002</bibRefCitation>
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;
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<bibRefCitation author="Payne, CM" journalOrPublisher="Philosophical Transactions of the Royal Society of London, series B" pageId="7" pageNumber="128" pagination="481 - 566" title=". The morphology of deep-sea Thyasiridae (Mollusca: Bivalvia) from the Atlantic Ocean." volume="334" year="1991">Payne and Allen 1991</bibRefCitation>
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). The type species of
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<taxonomicName class="Bivalvia" family="Thyasiridae" genus="Parathyasira" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Parathyasira" order="Lucinida" pageId="6" pageNumber="127" phylum="Mollusca" rank="genus">Parathyasira</taxonomicName>
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is
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<taxonomicName class="Bivalvia" family="Thyasiridae" genus="Parathyasira" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Parathyasira resupina" order="Lucinida" pageId="6" pageNumber="127" phylum="Mollusca" rank="species" species="resupina">Parathyasira resupina</taxonomicName>
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Iredale, 1930 (Fig. 9F) and has a shell microsculpture of radial rows of calcareous spines. This character is also seen in the Atlantic species
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<taxonomicName class="Bivalvia" family="Thyasiridae" genus="Parathyasira" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Parathyasira granulosa" order="Lucinida" pageId="6" pageNumber="127" phylum="Mollusca" rank="species" species="granulosa">Parathyasira granulosa</taxonomicName>
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(Monterosato, 1874),
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<taxonomicName class="Bivalvia" family="Thyasiridae" genus="Parathyasira" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Parathyasira subcircularis" order="Lucinida" pageId="6" pageNumber="127" phylum="Mollusca" rank="species" species="subcircularis">Parathyasira subcircularis</taxonomicName>
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Payne & Allen, 1991 (Fig. 9
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<normalizedToken originalValue="G–I">G-I</normalizedToken>
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) and an un-named species from the Arabian Sea (Figs 9
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<normalizedToken originalValue="A–E">A-E</normalizedToken>
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). The spines in these species are angular with strongly developed basal connections between the rows (Figs 9
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<normalizedToken originalValue="C–D">C-D</normalizedToken>
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). In contrast the spines in
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<taxonomicName class="Bivalvia" family="Thyasiridae" genus="Ochetoctena" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Ochetoctena" order="Lucinida" pageId="6" pageNumber="127" phylum="Mollusca" rank="genus">Ochetoctena</taxonomicName>
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are not arranged in rows, are conical and the basal connections are weak or absent (Figs 8
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<normalizedToken originalValue="C–E">C-E</normalizedToken>
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). The genus
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<taxonomicName class="Bivalvia" family="Thyasiridae" genus="Spinaxinus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Spinaxinus" order="Lucinida" pageId="6" pageNumber="127" phylum="Mollusca" rank="genus">Spinaxinus</taxonomicName>
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is characterised by having a spiny microsculpture but this is entirely periostracal (
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<bibRefCitation author="Oliver, PG" journalOrPublisher="Journal of Conchology" pageId="7" pageNumber="128" pagination="175 - 183" title="New species of Thyasiridae (Bivalvia) from chemosynthetic communities in the Atlantic Ocean." volume="39" year="2006">Oliver and Holmes 2006</bibRefCitation>
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;
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<bibRefCitation author="Oliver, PG" journalOrPublisher="Journal of Molluscan Studies" pageId="7" pageNumber="128" pagination="30 - 41" title="Bacterial symbiosis in Syssitomya pourtalesiana Oliver, 2012 [Galeommatoidea, Montacutidae]; a bivalve commensal with the deep-sea echinoid Pourtalesia." volume="79" year="2013">Oliver et al 2013</bibRefCitation>
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).
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</paragraph>
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<paragraph pageId="6" pageNumber="127">
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<taxonomicName class="Bivalvia" family="Thyasiridae" genus="Ochetoctena" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Ochetoctena" order="Lucinida" pageId="6" pageNumber="127" phylum="Mollusca" rank="genus">Ochetoctena</taxonomicName>
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is the only thyasirid known to have ctenidia of the Type 5T structure;
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<taxonomicName class="Bivalvia" family="Thyasiridae" genus="Conchocele" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Conchocele" order="Lucinida" pageId="6" pageNumber="127" phylum="Mollusca" rank="genus">Conchocele</taxonomicName>
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has a partly tubular gills of the Type 4TL morphology. The ctenidia of these
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<taxonomicName class="Bivalvia" family="Thyasiridae" genus="Parathyasira" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Parathyasira" order="Lucinida" pageId="6" pageNumber="127" phylum="Mollusca" rank="genus">Parathyasira</taxonomicName>
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species show poorly developed abfrontal extension resulting in a flimsy open structure.
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<bibRefCitation author="Dufour, SC" journalOrPublisher="Biological Bulletin" pageId="6" pageNumber="127" pagination="200 - 212" title="Gill anatomy and evolution of symbiosis in the bivalve family Thyasiridae." volume="208" year="2005">Dufour (2005)</bibRefCitation>
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reported that the gills of
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<taxonomicName class="Bivalvia" family="Thyasiridae" genus="Parathyasira" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Parathyasira granulosa" order="Lucinida" pageId="6" pageNumber="127" phylum="Mollusca" rank="species" species="granulosa">Parathyasira granulosa</taxonomicName>
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are of her type 2 (type 2aR above) suggesting that the genus
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<taxonomicName class="Bivalvia" family="Thyasiridae" genus="Parathyasira" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Parathyasira" order="Lucinida" pageId="6" pageNumber="127" phylum="Mollusca" rank="genus">Parathyasira</taxonomicName>
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is characterised by a weak symbiont partnership.
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</paragraph>
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<paragraph pageId="6" pageNumber="127">
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There are, therefore, shell and anatomical synapomorphies that separate
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<taxonomicName class="Bivalvia" family="Thyasiridae" genus="Ochetoctena" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Ochetoctena" order="Lucinida" pageId="6" pageNumber="127" phylum="Mollusca" rank="genus">Ochetoctena</taxonomicName>
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from all other known thyasirids.
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</paragraph>
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</subSubSection>
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</treatment>
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</document> |