241 lines
29 KiB
XML
241 lines
29 KiB
XML
<document ID-DOI="http://dx.doi.org/10.3897/zookeys.113.1402" ID-GBIF-Dataset="4bdc4525-26a2-480f-87bb-f4d0436e9898" ID-PMC="PMC3187628" ID-Pensoft-Pub="1313-2970-113-1" ID-PubMed="21976991" ModsDocAuthor="" ModsDocDate="2011" ModsDocID="1313-2970-113-1" ModsDocOrigin="ZooKeys 113" ModsDocTitle="Chemosymbiotic bivalves from the mud volcanoes of the Gulf of Cadiz, NE Atlantic, with descriptions of new species of Solemyidae, Lucinidae and Vesicomyidae" checkinTime="1451250231973" checkinUser="pensoft" docAuthor="Olive, Graham, Rodrigues, Clara F. & Cunha, Marina R." docDate="2011" docId="3EC805B59AA9E5F85185F0AA067D040D" docLanguage="en" docName="ZooKeys 113: 1-38" docOrigin="ZooKeys 113" docSource="http://dx.doi.org/10.3897/zookeys.113.1402" docTitle="Isorropodon megadesmus Olive, Rodrigues & Cunha, 2011, sp. n." docType="treatment" docVersion="3" lastPageNumber="15" masterDocId="C04A2C57FFE1EA27FFDE6818FFF2FF88" masterDocTitle="Chemosymbiotic bivalves from the mud volcanoes of the Gulf of Cadiz, NE Atlantic, with descriptions of new species of Solemyidae, Lucinidae and Vesicomyidae" masterLastPageNumber="38" masterPageNumber="1" pageNumber="13" updateTime="1668151773651" 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>Chemosymbiotic bivalves from the mud volcanoes of the Gulf of Cadiz, NE Atlantic, with descriptions of new species of Solemyidae, Lucinidae and Vesicomyidae</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>Olive, Graham</mods:namePart>
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</mods:name>
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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>Rodrigues, Clara F.</mods:namePart>
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</mods:name>
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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>Cunha, Marina R.</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>ZooKeys</mods:title>
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</mods:titleInfo>
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<mods:part>
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<mods:date>2011</mods:date>
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<mods:detail type="volume">
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<mods:number>113</mods:number>
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</mods:detail>
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<mods:extent unit="page">
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<mods:start>1</mods:start>
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<mods:end>38</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/zookeys.113.1402</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/zookeys.113.1402</mods:identifier>
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<mods:identifier type="Pensoft-Pub">1313-2970-113-1</mods:identifier>
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</mods:mods>
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<treatment ID-GBIF-Taxon="152030057" LSID="urn:lsid:plazi:treatment:3EC805B59AA9E5F85185F0AA067D040D" httpUri="http://treatment.plazi.org/id/3EC805B59AA9E5F85185F0AA067D040D" lastPageId="14" lastPageNumber="15" pageId="12" pageNumber="13">
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<subSubSection pageId="12" pageNumber="13" type="nomenclature">
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<paragraph pageId="12" pageNumber="13">
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<taxonomicName LSID="urn:lsid:zoobank.org:act:317BA11E-0B29-4396-8696-DEDCAF00B29F" class="Bivalvia" family="Vesicomyidae" genus="Isorropodon" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Isorropodon megadesmus" order="Venerida" pageId="12" pageNumber="13" phylum="Mollusca" rank="species" species="megadesmus">Isorropodon megadesmus</taxonomicName>
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<taxonomicNameLabel pageId="12" pageNumber="13">sp. n.</taxonomicNameLabel>
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Figs 910
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<normalizedToken originalValue="C–D">C-D</normalizedToken>
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</paragraph>
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</subSubSection>
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<subSubSection lastPageId="13" lastPageNumber="14" pageId="12" pageNumber="13" type="material examined">
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<paragraph pageId="12" pageNumber="13">Material examined.</paragraph>
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<paragraph lastPageId="13" lastPageNumber="14" pageId="12" pageNumber="13">
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Holotype: one complete specimen, live collected, MSM01.03, stn 218, deep-water field, Captain Arutyunov MV.
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<geoCoordinate direction="north" orientation="latitude" precision="1" value="35.6607">35°39.642'N</geoCoordinate>
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,
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<geoCoordinate direction="west" orientation="longitude" precision="1" value="-7.33415">07°20.049'W</geoCoordinate>
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, 1321m, 30 April 2006, NMWZ.2010.4.8
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<pageBreakToken pageId="13" pageNumber="14" start="start">.</pageBreakToken>
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</paragraph>
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<paragraph pageId="13" pageNumber="14">Paratypes: ten specimens, four shells and one valve, same data as holotype, NMWZ.2010.4.9.</paragraph>
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<paragraph pageId="13" pageNumber="14">
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Other material examined: over thirty decalcified juvenile specimens, MSM01.03, stn 218, deep-water field, Captain Arutyunov MV.
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<geoCoordinate direction="north" orientation="latitude" precision="1" value="35.6607">35°39.642'N</geoCoordinate>
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,
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<geoCoordinate direction="west" orientation="longitude" precision="1" value="-7.33415">07°20.049'W</geoCoordinate>
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, 1321m, 30 April 2006; one specimen, MSM01.03, stn 225, same locality,
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<geoCoordinate direction="north" orientation="latitude" precision="1" value="35.661785">35°39.707'N</geoCoordinate>
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,
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<geoCoordinate direction="west" orientation="longitude" precision="1" value="-7.333667">07°20.020'W</geoCoordinate>
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, 1322m, 4 May 2006.
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</paragraph>
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</subSubSection>
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<subSubSection pageId="13" pageNumber="14" type="measurements">
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<paragraph pageId="13" pageNumber="14">Measurements (in mm)</paragraph>
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<paragraph pageId="13" pageNumber="14">
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<table pageId="13" pageNumber="14">
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<tr pageId="13" pageNumber="14">
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<th colspan="1" pageId="13" pageNumber="14" rowspan="1">Length</th>
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<th colspan="1" pageId="13" pageNumber="14" rowspan="1">Height</th>
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<th colspan="1" pageId="13" pageNumber="14" rowspan="1">TumidityOne valve (paired)</th>
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<th colspan="1" pageId="13" pageNumber="14" rowspan="1">Ratio (L/T)</th>
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</tr>
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</table>
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</paragraph>
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</subSubSection>
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<subSubSection pageId="13" pageNumber="14" type="description">
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<paragraph pageId="13" pageNumber="14">Description.</paragraph>
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<paragraph pageId="13" pageNumber="14">
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(Figs 9, 10
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<normalizedToken originalValue="C–D">C-D</normalizedToken>
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). To 15mm in length. Thin. Equivalve. Inequilateral, beaks in front of the midline. Compressed, length to tumidity ratio 2.3 to 2.5. Outline subovate, anterior rounded, posterior a little obliquely truncated; ventral curvature at its maximum well to the posterior of the mid line. Lunule indistinct, not depressed. Escutcheon narrow, deeply excavated but entirely occupied by ligament. Sculpture of dense concentric lines and irregular growth stops or wrinkles. Hinge plate prominent dominated by a long nymph supporting a very large external ligament; ligament rises well above the dorsal margin of the shell and extends posteriorly beyond the nymph to fill the escutcheon. Hinge teeth complex; RV with a single prominent anterior lateral tooth situated in front of the beak in the form of a narrow projecting peg with a flat or slightly excavated dorsal surface; below the beak is an arched laminar tooth its anterior end overlapping the lateral tooth, its posterior slopes steeply and ventrally and merges with a second ridge only noticeable by a weak notch mid way on this combined ridge. LV with a thin laminar posterior cardinal angled obliquely plus two combined cardinals in a horizontal orientation the posterior part larger than the anterior with a distinct notch between the two parts. Pallial line entire with a very small straightened section below the posterior adductor scar; adductor scars of about equal size; anterior pedal retractor scar deeply impressed, situated immediately in front of the hinge plate. Periostracum thin, persistent, glossy. Shell white.
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</paragraph>
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<paragraph pageId="13" pageNumber="14">Mantle thin, mantle edge unfused except for short inhalant and exhalant siphonal apertures; inhalant aperture with many papillae increasing in size dorsally, exhalant with papillae of equal size. Foot with a distinct finger-like toe and poorly developed heel, pedal retractors prominent, the anterior attached in a deep impression close to the hinge. Anterior adductor muscle oval in cross-section, posterior adductor muscle subcircular, smaller than the anterior one. Ctenidia of a large, single (inner) demibranch, ascending part approximately one half the height of the outer, filaments fine tightly connected.</paragraph>
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</subSubSection>
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<subSubSection pageId="13" pageNumber="14" type="distribution">
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<paragraph pageId="13" pageNumber="14">Distribution.</paragraph>
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<paragraph pageId="13" pageNumber="14">
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<taxonomicName class="Bivalvia" family="Vesicomyidae" genus="Isorropodon" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Isorropodon megadesmus" order="Venerida" pageId="13" pageNumber="14" phylum="Mollusca" rank="species" species="megadesmus">Isorropodon megadesmus</taxonomicName>
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is restricted to Captain Arutyunov MV (1321-1322m).
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</paragraph>
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</subSubSection>
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<subSubSection pageId="13" pageNumber="14" type="etymology">
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<paragraph pageId="13" pageNumber="14">Etymology.</paragraph>
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<paragraph pageId="13" pageNumber="14">megadesmus from the Greek mega meaning large and desma meaning bond; referring to the external ligament.</paragraph>
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</subSubSection>
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<subSubSection lastPageId="14" lastPageNumber="15" pageId="13" pageNumber="14" type="remarks">
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<paragraph pageId="13" pageNumber="14">Remarks.</paragraph>
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<paragraph pageId="13" pageNumber="14">
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The taxonomy of
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<taxonomicName class="Bivalvia" family="Vesicomyidae" genus="Isorropodon" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Isorropodon" order="Venerida" pageId="13" pageNumber="14" phylum="Mollusca" rank="genus">Isorropodon</taxonomicName>
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in the Atlantic and Mediterranean is complex and potentially confused (
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<bibRefCitation author="Cosel, R von" journalOrPublisher="Sarsia" pageId="19" pageNumber="20" pagination="333 - 366" title="Vesicomyidae (Mollusca: Bivalvia) of the genera Vesicomya, Waisiuconcha, Isorropodon and Callogonia in the eastern Atlantic and Mediterranean." volume="86" year="2001">Cosel and Salas 2001</bibRefCitation>
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,
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<bibRefCitation author="Cosel, R von" journalOrPublisher="Deep Sea Research Part II: Topical Studies in Oceanography" pageId="19" pageNumber="20" pagination="2350 - 2379" title="Large Vesicomyidae (Mollusca: Bivalvia) from cold seeps in the Gulf of Guinea off the coasts of Gabon, Congo and northern Angola." url="doi:10.1016/j.dsr2.2009.04.016" volume="56" year="2009">Cosel and Olu 2009</bibRefCitation>
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).
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<bibRefCitation author="Cosel, R von" journalOrPublisher="Sarsia" pageId="19" pageNumber="20" pagination="333 - 366" title="Vesicomyidae (Mollusca: Bivalvia) of the genera Vesicomya, Waisiuconcha, Isorropodon and Callogonia in the eastern Atlantic and Mediterranean." volume="86" year="2001">Cosel and Salas (2001)</bibRefCitation>
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described two new species from the Eastern Atlantic, namely
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<taxonomicName class="Bivalvia" family="Vesicomyidae" genus="Isorropodon" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Isorropodon bigoti" order="Venerida" pageId="13" pageNumber="14" phylum="Mollusca" rank="species" species="bigoti">Isorropodon bigoti</taxonomicName>
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and
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<taxonomicName class="Bivalvia" family="Vesicomyidae" genus="Isorropodon" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Isorropodon curtum" order="Venerida" pageId="13" pageNumber="14" phylum="Mollusca" rank="species" species="curtum">Isorropodon curtum</taxonomicName>
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. They transferred a third from
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<taxonomicName class="Bivalvia" family="Kelliellidae" genus="Kelliella" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Kelliella" order="Venerida" pageId="13" pageNumber="14" phylum="Mollusca" rank="genus">Kelliella</taxonomicName>
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, namely
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<taxonomicName class="Bivalvia" family="Vesicomyidae" genus="Isorropodon" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Isorropodon elongatum" order="Venerida" pageId="13" pageNumber="14" phylum="Mollusca" rank="species" species="elongatum">Isorropodon elongatum</taxonomicName>
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(
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<bibRefCitation author="Allen, JA" journalOrPublisher="Zoological Journal of the Linnean Society" pageId="19" pageNumber="20" pagination="199 - 226" title="The family Kelliellidae (Bivalvia: Heterodonta) from the deep Atlantic and its relationship with the family Vesicomyidae." url="doi:10.1098/rstb.1958.0010" volume="131" year="2001">Allen 2001</bibRefCitation>
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). In discussing, the Mediterranean,
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<taxonomicName class="Bivalvia" family="Vesicomyidae" genus="Isorropodon" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Isorropodon perplexum" order="Venerida" pageId="13" pageNumber="14" phylum="Mollusca" rank="species" species="perplexum">Isorropodon perplexum</taxonomicName>
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<bibRefCitation author="Cosel, R von" journalOrPublisher="Sarsia" pageId="19" pageNumber="20" pagination="333 - 366" title="Vesicomyidae (Mollusca: Bivalvia) of the genera Vesicomya, Waisiuconcha, Isorropodon and Callogonia in the eastern Atlantic and Mediterranean." volume="86" year="2001">Cosel and Salas (2001)</bibRefCitation>
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stated that
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<taxonomicName class="Bivalvia" family="Vesicomyidae" genus="Isorropodon" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Isorropodon" order="Venerida" pageId="13" pageNumber="14" phylum="Mollusca" rank="genus">Isorropodon</taxonomicName>
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species are variable with regard to outline, tumidity and development of hinge teeth and this is illustrated in their figures 36-47 for
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<taxonomicName class="Bivalvia" family="Vesicomyidae" genus="Isorropodon" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Isorropodon perplexum" order="Venerida" pageId="13" pageNumber="14" phylum="Mollusca" rank="species" species="perplexum">Isorropodon perplexum</taxonomicName>
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. They noted similarities in shell morphology between the Eastern Mediterranean species
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<taxonomicName class="Bivalvia" family="Vesicomyidae" genus="Isorropodon" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Isorropodon perplexum" order="Venerida" pageId="13" pageNumber="14" phylum="Mollusca" rank="species" species="perplexum">Isorropodon perplexum</taxonomicName>
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and the West African
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<taxonomicName class="Bivalvia" family="Vesicomyidae" genus="Isorropodon" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Isorropodon bigoti" order="Venerida" pageId="13" pageNumber="14" phylum="Mollusca" rank="species" species="bigoti">Isorropodon bigoti</taxonomicName>
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but suggested that these taxa were isolated geographically and doubtfully could have gene flow between them. They further supported this argument by stating that
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<taxonomicName class="Bivalvia" family="Vesicomyidae" genus="Isorropodon" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Isorropodon perplexum" order="Venerida" pageId="13" pageNumber="14" phylum="Mollusca" rank="species" species="perplexum">Isorropodon perplexum</taxonomicName>
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had not been found in the Western Mediterranean or Ibero-Moroccan Gulf. In 2009,
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<bibRefCitation author="Cosel, R von" journalOrPublisher="Deep Sea Research Part II: Topical Studies in Oceanography" pageId="19" pageNumber="20" pagination="2350 - 2379" title="Large Vesicomyidae (Mollusca: Bivalvia) from cold seeps in the Gulf of Guinea off the coasts of Gabon, Congo and northern Angola." url="doi:10.1016/j.dsr2.2009.04.016" volume="56" year="2009">Cosel and Olu</bibRefCitation>
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described another
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<taxonomicName class="Bivalvia" family="Vesicomyidae" genus="Isorropodon" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Isorropodon" order="Venerida" pageId="13" pageNumber="14" phylum="Mollusca" rank="genus">Isorropodon</taxonomicName>
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from West Africa (
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<taxonomicName class="Bivalvia" family="Vesicomyidae" genus="Isorropodon" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Isorropodon atalantae" order="Venerida" pageId="13" pageNumber="14" phylum="Mollusca" rank="species" species="atalantae">Isorropodon atalantae</taxonomicName>
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) and placed another vesicomyid in this genus (
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<taxonomicName class="Bivalvia" family="Vesicomyidae" genus="Isorropodon" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Isorropodon striatum" order="Venerida" pageId="13" pageNumber="14" phylum="Mollusca" rank="species" species="striatum">Isorropodon striatum</taxonomicName>
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<bibRefCitation author="Thiele, J" journalOrPublisher="Wissenschaften Ergbnisse der Deutschen Tiefsee-Expedition auf der Dampfer " Valdivia " 1898 - 1899," pageId="19" pageNumber="20" pagination="161 - 268" title="Muscheln der deutschen Tiefsee-Expedition." volume="21" year="1931">Thiele and Jaeckel 1931</bibRefCitation>
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). Therefore, before the discovery of
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<taxonomicName class="Bivalvia" family="Vesicomyidae" genus="Isorropodon" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Isorropodon" order="Venerida" pageId="13" pageNumber="14" phylum="Mollusca" rank="genus">Isorropodon</taxonomicName>
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in the Gulf of Cadiz there were already five west African species and one from the eastern Mediterranean. With the discovery of
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<taxonomicName class="Bivalvia" family="Vesicomyidae" genus="Isorropodon" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Isorropodon" order="Venerida" pageId="13" pageNumber="14" phylum="Mollusca" rank="genus">Isorropodon</taxonomicName>
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at the Capt. Arutyunov MV the assertion made by
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<bibRefCitation author="Cosel, R von" journalOrPublisher="Sarsia" pageId="19" pageNumber="20" pagination="333 - 366" title="Vesicomyidae (Mollusca: Bivalvia) of the genera Vesicomya, Waisiuconcha, Isorropodon and Callogonia in the eastern Atlantic and Mediterranean." volume="86" year="2001">Cosel and Salas (2001)</bibRefCitation>
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on genetic isolation can be questioned, as there is the possibility of gene flow between the seeps in the Mediterranean and around the east African coast.
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</paragraph>
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<paragraph lastPageId="14" lastPageNumber="15" pageId="13" pageNumber="14">
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In contrast to the variability given by
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<bibRefCitation author="Cosel, R von" journalOrPublisher="Sarsia" pageId="19" pageNumber="20" pagination="333 - 366" title="Vesicomyidae (Mollusca: Bivalvia) of the genera Vesicomya, Waisiuconcha, Isorropodon and Callogonia in the eastern Atlantic and Mediterranean." volume="86" year="2001">Cosel and Salas (2001)</bibRefCitation>
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for
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<taxonomicName class="Bivalvia" family="Vesicomyidae" genus="Isorropodon" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Isorropodon perplexum" order="Venerida" pageId="13" pageNumber="14" phylum="Mollusca" rank="species" species="perplexum">Isorropodon perplexum</taxonomicName>
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, all of the shells from station 218 examined here are constant with regard to features of outline, tumidity and hinge teeth. However, a single shell from station 180 is distinct, being inflated, having a distinct lunule, having a much smaller ligament and in the ventral margin being more convex. The shells from station 218 are distinct from all
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<pageBreakToken pageId="14" pageNumber="15" start="start">the</pageBreakToken>
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shells of
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<taxonomicName class="Bivalvia" family="Vesicomyidae" genus="Isorropodon" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Isorropodon perplexum" order="Venerida" pageId="14" pageNumber="15" phylum="Mollusca" rank="species" species="perplexum">Isorropodon perplexum</taxonomicName>
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figured by
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<bibRefCitation author="Cosel, R von" journalOrPublisher="Sarsia" pageId="19" pageNumber="20" pagination="333 - 366" title="Vesicomyidae (Mollusca: Bivalvia) of the genera Vesicomya, Waisiuconcha, Isorropodon and Callogonia in the eastern Atlantic and Mediterranean." volume="86" year="2001">Cosel and Salas (2001)</bibRefCitation>
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in having a much longer nymph with the posterior teeth reaching only about one third of the ligament as opposed to the half distance given for
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<taxonomicName class="Bivalvia" family="Vesicomyidae" genus="Isorropodon" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Isorropodon perplexum" order="Venerida" pageId="14" pageNumber="15" phylum="Mollusca" rank="species" species="perplexum">Isorropodon perplexum</taxonomicName>
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by
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<bibRefCitation author="Cosel, R von" journalOrPublisher="Sarsia" pageId="19" pageNumber="20" pagination="333 - 366" title="Vesicomyidae (Mollusca: Bivalvia) of the genera Vesicomya, Waisiuconcha, Isorropodon and Callogonia in the eastern Atlantic and Mediterranean." volume="86" year="2001">Cosel and Salas (2001)</bibRefCitation>
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. Furthermore, most of the shells illustrated by them have a more convex ventral margin than the shells from station 218. The single shell from station 180 shares more features with the Mediterranean shells in having the small ligament, convex ventral margin and being more inflated.
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</paragraph>
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<paragraph pageId="14" pageNumber="15">
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The outline of
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<taxonomicName class="Bivalvia" family="Vesicomyidae" genus="Isorropodon" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Isorropodon bigoti" order="Venerida" pageId="14" pageNumber="15" phylum="Mollusca" rank="species" species="bigoti">Isorropodon bigoti</taxonomicName>
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differs from all of the above in the narrower anterior and distinct angulation of the ventral curve, but is has a short nymph similar to
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<taxonomicName class="Bivalvia" family="Vesicomyidae" genus="Isorropodon" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Isorropodon perplexum" order="Venerida" pageId="14" pageNumber="15" phylum="Mollusca" rank="species" species="perplexum">Isorropodon perplexum</taxonomicName>
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and the shell from station 180.
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</paragraph>
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<paragraph pageId="14" pageNumber="15">
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<taxonomicName class="Bivalvia" family="Vesicomyidae" genus="Isorropodon" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Isorropodon atalantae" order="Venerida" pageId="14" pageNumber="15" phylum="Mollusca" rank="species" species="atalantae">Isorropodon atalantae</taxonomicName>
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has a more sunken lunule and more angular posterior profile than either of the Gulf of Cadiz taxa.
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<taxonomicName class="Bivalvia" family="Vesicomyidae" genus="Isorropodon" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Isorropodon curtum" order="Venerida" pageId="14" pageNumber="15" phylum="Mollusca" rank="species" species="curtum">Isorropodon curtum</taxonomicName>
|
||
Cosel and Salas, 2001, from off Mauritania, is more circular in outline and
|
||
<taxonomicName class="Bivalvia" family="Vesicomyidae" genus="Isorropodon" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Isorropodon striatum" order="Venerida" pageId="14" pageNumber="15" phylum="Mollusca" rank="species" species="striatum">I striatum</taxonomicName>
|
||
Thiele and Jaeckel, 1931 from off Angola, is a much larger and more elongate form.
|
||
</paragraph>
|
||
<paragraph pageId="14" pageNumber="15">
|
||
<bibRefCitation author="Cosel, R von" journalOrPublisher="Sarsia" pageId="19" pageNumber="20" pagination="333 - 366" title="Vesicomyidae (Mollusca: Bivalvia) of the genera Vesicomya, Waisiuconcha, Isorropodon and Callogonia in the eastern Atlantic and Mediterranean." volume="86" year="2001">Cosel and Salas (2001)</bibRefCitation>
|
||
reassigned
|
||
<taxonomicName class="Bivalvia" family="Kelliellidae" genus="Kelliella" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Kelliella elongata" order="Venerida" pageId="14" pageNumber="15" phylum="Mollusca" rank="species" species="elongata">Kelliella elongata</taxonomicName>
|
||
Allen, 2001 to the genus
|
||
<taxonomicName class="Bivalvia" family="Vesicomyidae" genus="Isorropodon" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Isorropodon" order="Venerida" pageId="14" pageNumber="15" phylum="Mollusca" rank="genus">Isorropodon</taxonomicName>
|
||
. Following examination of the type material in the Natural History Museum, London (BMNH 1998180) we conclude that it is not conspecific with any of the taxa discussed here. It is a small species not exceeding 2mm in any of the over 300 specimens listed by
|
||
<bibRefCitation author="Allen, JA" journalOrPublisher="Zoological Journal of the Linnean Society" pageId="19" pageNumber="20" pagination="199 - 226" title="The family Kelliellidae (Bivalvia: Heterodonta) from the deep Atlantic and its relationship with the family Vesicomyidae." url="doi:10.1098/rstb.1958.0010" volume="131" year="2001">Allen (2001)</bibRefCitation>
|
||
. It is inflated with a distinct lunule but the demarcating line illustrated by
|
||
<bibRefCitation author="Allen, JA" journalOrPublisher="Zoological Journal of the Linnean Society" pageId="19" pageNumber="20" pagination="199 - 226" title="The family Kelliellidae (Bivalvia: Heterodonta) from the deep Atlantic and its relationship with the family Vesicomyidae." url="doi:10.1098/rstb.1958.0010" volume="131" year="2001">Allen (2001)</bibRefCitation>
|
||
is not so apparent. The hinge of the right valve has three distinct teeth including a small posterior tooth (4b in
|
||
<bibRefCitation author="Allen, JA" journalOrPublisher="Zoological Journal of the Linnean Society" pageId="19" pageNumber="20" pagination="199 - 226" title="The family Kelliellidae (Bivalvia: Heterodonta) from the deep Atlantic and its relationship with the family Vesicomyidae." url="doi:10.1098/rstb.1958.0010" volume="131" year="2001">Allen 2001</bibRefCitation>
|
||
), which is not present in either of the species from the Cadiz mud volcanoes. Furthermore, the ligament is small and does not project as in
|
||
<taxonomicName class="Bivalvia" family="Vesicomyidae" genus="Isorropodon" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Isorropodon megadesmus" order="Venerida" pageId="14" pageNumber="15" phylum="Mollusca" rank="species" species="megadesmus">Isorropodon megadesmus</taxonomicName>
|
||
. From the ctenidial anatomy there is no indication that this species is chemosymbiotic. In addition to the morphological differences,
|
||
<taxonomicName class="Bivalvia" family="Vesicomyidae" genus="Isorropodon" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Isorropodon elongatum" order="Venerida" pageId="14" pageNumber="15" phylum="Mollusca" rank="species" species="elongatum">Isorropodon elongatum</taxonomicName>
|
||
has been collected from a wide geographical range, wide bathymetric range and associated with the typical oligotrophic deep-sea bivalve assemblage (derived from
|
||
<bibRefCitation author="Allen, JA" journalOrPublisher="Malacologia" pageId="19" pageNumber="20" pagination="57 - 173" title="Bivalvia of the Deep Atlantic." url="doi:10.1111/j.1096-3642.2001.tb01315.x" volume="50" year="2008">Allen 2008</bibRefCitation>
|
||
). It would appear that
|
||
<taxonomicName class="Bivalvia" family="Vesicomyidae" genus="Isorropodon" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Isorropodon elongatum" order="Venerida" pageId="14" pageNumber="15" phylum="Mollusca" rank="species" species="elongatum">Isorropodon elongatum</taxonomicName>
|
||
, if a chemosymbiotic species is not confined to seep/vent settings but as stated by
|
||
<bibRefCitation author="Allen, JA" journalOrPublisher="Zoological Journal of the Linnean Society" pageId="19" pageNumber="20" pagination="199 - 226" title="The family Kelliellidae (Bivalvia: Heterodonta) from the deep Atlantic and its relationship with the family Vesicomyidae." url="doi:10.1098/rstb.1958.0010" volume="131" year="2001">Allen (2001)</bibRefCitation>
|
||
it is absent from the European basin and it was not present in the samples taken in the Gulf of Cadiz away from the vicinity of the mud volcanoes (
|
||
<bibRefCitation author="Rodrigues, CF" journalOrPublisher="Departamento de Biologia, Universidade de Aveiro, Aveiro" pageId="19" pageNumber="20" title="Comunidades macrobentonicas dos vulcoes de lama do Golfo de Cadis // Macrofaunal assemblages from mud volcanoes of the Gulf of Cadiz." year="2009">Rodrigues 2009</bibRefCitation>
|
||
).
|
||
</paragraph>
|
||
<caption pageId="14" pageNumber="15">
|
||
<paragraph pageId="14" pageNumber="15">
|
||
Figure 9.
|
||
<taxonomicName class="Bivalvia" family="Vesicomyidae" genus="Isorropodon" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Isorropodon megadesmus" order="Venerida" pageId="14" pageNumber="15" phylum="Mollusca" rank="species" species="megadesmus">Isorropodon megadesmus</taxonomicName>
|
||
sp. n. stn. 218, Captain Arutyunov MV. A large right valve, paratype
|
||
<normalizedToken originalValue="B–D">B-D</normalizedToken>
|
||
holotype, right valve external, left valve internal, right valve internal E small right valve, paratype F dorsal view, paratype G gross anatomy viewed after removal of right valve and mantle.
|
||
</paragraph>
|
||
</caption>
|
||
<caption pageId="14" pageNumber="15">
|
||
<paragraph pageId="14" pageNumber="15">
|
||
Figure 10. Comparison between the hinge teeth of
|
||
<taxonomicName class="Bivalvia" family="Vesicomyidae" genus="Isorropodon" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Isorropodon" order="Venerida" pageId="14" pageNumber="15" phylum="Mollusca" rank="genus">Isorropodon</taxonomicName>
|
||
sp. indet. (A, B) and
|
||
<taxonomicName class="Bivalvia" family="Vesicomyidae" genus="Isorropodon" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Isorropodon megadesmus" order="Venerida" pageId="14" pageNumber="15" phylum="Mollusca" rank="species" species="megadesmus">Isorropodon megadesmus</taxonomicName>
|
||
sp. n. (C, D).
|
||
</paragraph>
|
||
</caption>
|
||
</subSubSection>
|
||
</treatment>
|
||
</document> |