144 lines
17 KiB
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144 lines
17 KiB
XML
<document id="F605394F041D1D03FC1CFA203A2B2814" ID-CLB-Dataset="28469" ID-DOI="http://dx.doi.org/10.3897/zse.90.8323" ID-GBIF-Dataset="d06197ad-896a-4d36-94b4-18ae1ca0a56e" ID-Pensoft-Pub="1860-0743-2-121" ID-ZooBank="C7680624DD5D44888387171823EEC0AF" ModsDocAuthor="" ModsDocDate="2014" ModsDocID="1860-0743-2-121" ModsDocOrigin="Zoosystematics and Evolution 90 (2)" ModsDocTitle="“TUBULAR GILLS” Extreme gill modification in the Thyasiroidea with the description of Ochetoctenatomasi gen. et sp. nov. (Bivalvia: Thyasiroidea)" checkinTime="1552154802459" checkinUser="pensoft" docAuthor="Oliver, P. Graham" docDate="2014" docId="40E1D9FA051318D4543653152889B63C" 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="7" lastPageNumber="127" masterDocId="FF848B2B662FFFDBC630FF8EFFD2FFA5" masterDocTitle="" TUBULAR GILLS " Extreme gill modification in the Thyasiroidea with the description of Ochetoctenatomasi gen. et sp. nov. (Bivalvia: Thyasiroidea)" masterLastPageNumber="132" masterPageNumber="121" pageNumber="126" updateTime="1701381708528" updateUser="ExternalLinkService">
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<mods:title id="FBDD5CE64F7F4949B6EBD9936A6E9974">" TUBULAR GILLS " Extreme gill modification in the Thyasiroidea with the description of Ochetoctenatomasi gen. et sp. nov. (Bivalvia: Thyasiroidea)</mods:title>
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<mods:namePart id="A99BF1D5EBE2C20CF1C6413388EE99FD">Oliver, P. Graham</mods:namePart>
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<mods:title id="B91B12A3A1B15E4FDD4E0AD8231D9EA1">Zoosystematics and Evolution</mods:title>
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<mods:part id="546E98C58226BF1E5AAA1652C2BA87FA">
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<mods:date id="B502B1FA6EE31737D3CF20D0C538B447">2014</mods:date>
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<mods:number id="8AE6BD63C157C0A9EF6C2FBAC4CAA863">90</mods:number>
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<mods:number id="23856E920F6201A06456BED11D0278F4">2</mods:number>
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<mods:classification id="4BF82BAE58718366123B83B7E9A7190B">journal article</mods:classification>
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<mods:identifier id="2A82E04FCA3BB3B90C62205485940249" type="DOI">http://dx.doi.org/10.3897/zse.90.8323</mods:identifier>
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<mods:identifier id="B5A3962E188585B71987F97BEA2D7A2F" type="Pensoft-Pub">1860-0743-2-121</mods:identifier>
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<treatment id="40E1D9FA051318D4543653152889B63C" ID-GBIF-Taxon="154365955" LSID="urn:lsid:zoobank.org:act:BEDD6D75-67E5-4141-901B-E28EBEFD1941" httpUri="http://treatment.plazi.org/id/40E1D9FA051318D4543653152889B63C" lastPageId="6" lastPageNumber="127" pageId="5" pageNumber="126">
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<subSubSection id="0D844739373EB847242D220ABCBC8B34" pageId="5" pageNumber="126" type="nomenclature">
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<paragraph id="E623B5991E356BCF05CF1A56A42C622E" pageId="5" pageNumber="126">
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<taxonomicName id="A03D43B1FB47AF15E29F9732AB02EA46" LSID="http://zoobank.org/BEDD6D75-67E5-4141-901B-E28EBEFD1941" class="Bivalvia" family="Thyasiridae" genus="Ochetoctena" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Ochetoctena tomasi" order="Veneroida" pageId="5" pageNumber="126" phylum="Mollusca" rank="species" species="tomasi">
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<pageBreakToken id="81E7925ED31C007EDB7C662EDFD9279C" pageId="5" pageNumber="126" start="start">Ochetoctena</pageBreakToken>
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tomasi
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</taxonomicName>
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<taxonomicNameLabel id="00A0C2197AB1F9B76CBCEBB0D895824C" pageId="5" pageNumber="126">sp. nov.</taxonomicNameLabel>
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</paragraph>
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</subSubSection>
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<subSubSection id="D9304718F2CE266D5CF7CE84D422CC11" pageId="5" pageNumber="126" type="reference_group">
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<paragraph id="FC57DB426343D45F7FB4EA633BCA56EF" pageId="5" pageNumber="126">
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<taxonomicName id="4FD2F51DF2461387B82000275399860C" class="Bivalvia" family="Thyasiridae" genus="Thyasira" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Thyasira" order="Veneroida" 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 id="8B98EFE721F526DFAF28077509ED3F71" pageId="5" pageNumber="126" type="material examined">
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<paragraph id="652FAC16E648A736421A607A5934C441" pageId="5" pageNumber="126">Material examined.</paragraph>
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<paragraph id="BF1DA50706DB042D686BC6A07D59206E" 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 id="D87C933B225EF494FE700E166503C771" direction="south" orientation="latitude" precision="9" value="-5.7973332">05°47.84' S</geoCoordinate>
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.
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<geoCoordinate id="9C39DD92CAA0F2039B2B76D39635C011" 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 id="CA0A74C98F3434F1BD44D26883A31175" 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 id="FD1AF4DB5EE514166D310F3FAC483C13" lastPageId="6" lastPageNumber="127" pageId="5" pageNumber="126" type="description of holotype">
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<paragraph id="34ADE861EDAE57444EE083868A9F3948" pageId="5" pageNumber="126">Description of holotype.</paragraph>
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<paragraph id="237FFF2BB9C1BAA53570DF710B7A2618" 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 id="0093451299A4799C101B0515A5A14803" 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 id="305530A79B3917175FF05FB70404CD96" pageId="6" pageNumber="127" type="anatomy">
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<paragraph id="CE24FC58F459239AC459E000DFFE0F28" pageId="6" pageNumber="127">Anatomy.</paragraph>
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<paragraph id="D31ACF089208D5FBFB7AC23738B5C4D4" 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 id="D73C791713328BD2F36183635481E6A3" pageId="6" pageNumber="127" type="etymology">
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<paragraph id="A9EECAE33C09869BC90AAA6439732BEB" pageId="6" pageNumber="127">Etymology.</paragraph>
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<paragraph id="3EC6C9BD2EED7A94D2374A0189E85EDC" pageId="6" pageNumber="127">Named for my son Tomas.</paragraph>
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</subSubSection>
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<subSubSection id="ABAC484EF7EEC4430F2260E7F233F950" pageId="6" pageNumber="127" type="discussion">
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<paragraph id="3554A77337E059BAA0F67CA2945BBFBA" pageId="6" pageNumber="127">Discussion.</paragraph>
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<paragraph id="A704C48CFBFECC8A222B44851EF04F60" pageId="6" pageNumber="127">
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The shell of
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<taxonomicName id="72B95A420F2EF16EFDA8D1877BEBD4B2" 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 id="84A7FA42E50551F5AC23E8CD680485CE" 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 id="72448DBE3BD76A7A52E145DB0FF1BDB7" 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 id="34C684641090CCD9ACDA45CBF04E1CC1" 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 id="850E0F6AA7D71E64B06092D2C585F8F5" 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 id="3EE1F67BB1C904707010FA708F8B7782" 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 id="7E41D6BC8042B5B42AF694AECB492B19" 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 id="95618B23E993E56D522D5E0C410C28B9" 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 id="B3071248E8E93C161E74E3E96FE7B22C" 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 id="0014CD2C5DCF14DCB1D94BC65F3F3C9D" 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 id="762088812AABF9158983A930D45750A2" 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 id="D5B70745C98A740997794B1838FC5E82" 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 id="0174FC7E03861FDBAD8B46E77425C180" originalValue="C–D">C-D</normalizedToken>
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). In contrast the spines in
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<taxonomicName id="84496A8A4FE06FDBC384C3B347295DE3" 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 id="978C4BA6AAC6A60E056A150505A2B6BD" originalValue="C–E">C-E</normalizedToken>
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). The genus
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<taxonomicName id="1513731940D1A94740C4FA47AB68E97D" 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 id="0A5CA7254D0A88C0E80F6747AFF5CBD8" 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 id="3E3C246EDBE724B0E95DAD87C0AB7269" author="Oliver, PG" journalOrPublisher="Journal of Molluscan Studies" pageId="7" pageNumber="128" pagination="30 - 41" title="Bacterial symbiosis in Syssitomyapourtalesiana 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 id="12244725B71A4068AD295F31F2D4138D" pageId="6" pageNumber="127">
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<taxonomicName id="FDC8681E78CB7D9674D036D5A2E19A82" 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 id="35A667193C67DC4170AE746026DF6AAD" 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 id="9B9CFDDC6BA6A9424DDD1403F3E2BC6D" 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 id="CCEB5391261A19E548AADC173026FE7B" 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 id="C4E9B0B389B988A7B7F7A22B4D116FAE" 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 id="16A23FD2189750AF438C2EEE523C09B0" 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 id="28644A87FB1E7F31F1FE46961CD081B2" pageId="6" pageNumber="127">
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There are, therefore, shell and anatomical synapomorphies that separate
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<taxonomicName id="AD3382FB5C1E8DD41A4A36ED5A13C29B" 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> |