282 lines
30 KiB
XML
282 lines
30 KiB
XML
<document id="94402A4C322B1BBEE90B1D854460B09D" ID-CLB-Dataset="28792" ID-DOI="http://dx.doi.org/10.3897/zookeys.799.25843" ID-GBIF-Dataset="814f7eb8-bb51-4301-ad5d-f32ae874874c" ID-PMC="PMC6281703" ID-Pensoft-Pub="1313-2970-799-21" ID-PubMed="30532616" ID-ZooBank="804EEC5868CE445D98F22B4DFDBE2AC8" ModsDocAuthor="" ModsDocDate="2018" ModsDocID="1313-2970-799-21" ModsDocOrigin="ZooKeys 799" ModsDocTitle="Taxonomy of myid bivalves from fragmented brackish-water habitats in India, with a description of a new genus Indosphenia (Myidae, Myoidea, Myidae)" checkinTime="1543455905774" checkinUser="pensoft" docAuthor="Oliver, P. Graham, Hallan, Anders, Jayachandran, P. R., Joseph, Philomina, V. F. Sanu, & Nandan, S. Bijoy" docDate="2018" docId="E6F8E299B49F8F8D99EBFD8C519EA01C" docLanguage="en" docName="ZooKeys 799: 21-46" docOrigin="ZooKeys 799" docSource="http://dx.doi.org/10.3897/zookeys.799.25843" docTitle="Indosphenia abbreviata Preston 1907" docType="treatment" docVersion="8" lastPageNumber="32" masterDocId="BF51FFE2AC69E5145B45FF8104589368" masterDocTitle="Taxonomy of myid bivalves from fragmented brackish-water habitats in India, with a description of a new genus Indosphenia (Myidae, Myoidea, Myidae)" masterLastPageNumber="46" masterPageNumber="21" originalUpdateDomain="Boston" originalUpdateTime="1543455905774" originalUpdateUser="pensoft" pageNumber="30" updateTime="1701376012679" updateUser="ExternalLinkService">
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<mods:title id="3C5198DAE2B1B90D4F08390BDE18DD47">Taxonomy of myid bivalves from fragmented brackish-water habitats in India, with a description of a new genus Indosphenia (Myidae, Myoidea, Myidae)</mods:title>
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<mods:namePart id="AB8785322EF1C95B6DF2695F7E832319">Oliver, P. Graham</mods:namePart>
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<mods:namePart id="38FF578C2726ED8275AE573949CF35A8">Hallan, Anders</mods:namePart>
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<mods:namePart id="3B8529E87C4549759541474E8304B046">Jayachandran, P. R.</mods:namePart>
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<mods:name id="43482C04409A5D69817D4EA37B8F7AD2" type="personal">
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<mods:namePart id="AFFD7ED85D0B22F2F665E89FE3305660">Joseph, Philomina</mods:namePart>
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<mods:name id="9443AB78E4BAF3D5CBA2930408E8487C" type="personal">
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<mods:namePart id="F5D1EA0A34C166218F1EBBA4424307B9">V. F. Sanu,</mods:namePart>
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<mods:namePart id="AC67C5D7F3007F2D244B567A58FB59A2">Nandan, S. Bijoy</mods:namePart>
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<mods:typeOfResource id="66CC127104FB1A0D2CEBCE2CFCE24603">text</mods:typeOfResource>
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<mods:title id="318F75C45C6F08DBFD3706081BBA5535">ZooKeys</mods:title>
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<mods:date id="0DFE26E36407C1A051740F0DA87E009A">2018</mods:date>
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<mods:detail id="D15E3C24DFE7F9EF66F2346D105F580B" type="volume">
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<mods:number id="40FAB614E487D026C82A4C2D2E73DA92">799</mods:number>
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<mods:start id="3FD99F0BEE85E691A26598000D413C35">21</mods:start>
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<mods:url id="AD39E1112A227880740B46B83C49C7E4">http://dx.doi.org/10.3897/zookeys.799.25843</mods:url>
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<mods:classification id="0DFFB6D482AB024E60FE6BFFFC910A8A">journal article</mods:classification>
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<mods:identifier id="6E78E835E64F3175CFDD46BDE30DF410" type="DOI">http://dx.doi.org/10.3897/zookeys.799.25843</mods:identifier>
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<mods:identifier id="665ACCCB6240AF32A2B2AC7FA79D0C8E" type="Pensoft-Pub">1313-2970-799-21</mods:identifier>
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<mods:identifier id="DEAB4963BE23C59A944EA88918671B1A" type="ZooBank">804EEC5868CE445D98F22B4DFDBE2AC8</mods:identifier>
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<treatment id="E6F8E299B49F8F8D99EBFD8C519EA01C" ID-GBIF-Taxon="149831371" LSID="urn:lsid:plazi:treatment:E6F8E299B49F8F8D99EBFD8C519EA01C" httpUri="http://treatment.plazi.org/id/E6F8E299B49F8F8D99EBFD8C519EA01C" lastPageId="12" lastPageNumber="32" pageId="9" pageNumber="30">
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<subSubSection id="01ABB80691D8A2A5C726DA7EE3F733F7" pageId="9" pageNumber="30" type="nomenclature">
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<paragraph id="A581AE17D9C24AE7090B1CB764A3FE4C" pageId="9" pageNumber="30">
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<taxonomicName id="5D62CCA034F12A1D297F6157B26A5DDD" ID-CoL="7RQYC" authority="Preston, 1907" authorityName="Preston" authorityYear="1907" class="Bivalvia" family="Myidae" genus="Indosphenia" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Indosphenia abbreviata" order="Myida" pageId="9" pageNumber="30" phylum="Mollusca" rank="species" species="abbreviata">Indosphenia abbreviata (Preston, 1907)</taxonomicName>
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</paragraph>
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||
</subSubSection>
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||
<subSubSection id="21544B451F992FA65397C61A4632711F" pageId="9" pageNumber="30" type="reference_group">
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<paragraph id="FBA8011AB08640748C06B0FD5BA46F10" pageId="9" pageNumber="30">
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||
<taxonomicName id="65929E4CC1F53917F9F655F56FC7561E" class="Bivalvia" family="Myidae" genus="Corbula" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Corbula abbreviata" order="Myida" pageId="9" pageNumber="30" phylum="Mollusca" rank="species" species="abbreviata">Corbula abbreviata</taxonomicName>
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Preston, 1907: 215, fig. 1;
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<bibRefCitation id="2461C51920AD7ACFB0F52AD94CBB5A9B" author="Ramakrishna," journalOrPublisher="Zoological Survey of India Occasional Paper" pageId="23" pageNumber="44" pagination="1 - 427" title="Annotated checklist of Indian Marine Molluscs (Cephalopoda, Bivalvia and Scaphopoda) Part 1." volume="320" year="2010">Ramakrishna and Dey 2010</bibRefCitation>
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||
: 269.
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</paragraph>
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<paragraph id="AE9B078DE505E86DE5A8C9EE6E454490" pageId="9" pageNumber="30">
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<taxonomicName id="5964B7089E47B9354E9D2DD2612E66CF" class="Bivalvia" family="Myidae" genus="Corbula" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Corbula alcocki" order="Myida" pageId="9" pageNumber="30" phylum="Mollusca" rank="species" species="alcocki">Corbula alcocki</taxonomicName>
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Preston, 1907: 215, fig. 2.
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</paragraph>
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<paragraph id="B19C4DCFD5469A6AF5C05FEE82AF4E15" pageId="9" pageNumber="30">
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<taxonomicName id="F4C33232DB4BFC7750975668613205B5" class="Bivalvia" family="Myidae" genus="Corbula" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Corbula calcarea" order="Myida" pageId="9" pageNumber="30" phylum="Mollusca" rank="species" species="calcarea">Corbula calcarea</taxonomicName>
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Preston, 1907: 216, fig. 3;
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<bibRefCitation id="54CEECF8E6A77F7B648CCDF8062E1BD5" author="Ramakrishna," journalOrPublisher="Zoological Survey of India Occasional Paper" pageId="23" pageNumber="44" pagination="1 - 427" title="Annotated checklist of Indian Marine Molluscs (Cephalopoda, Bivalvia and Scaphopoda) Part 1." volume="320" year="2010">Ramakrishna and Dey 2010</bibRefCitation>
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, 269.
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</paragraph>
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<paragraph id="F4E01A53026C0B82A8403B1DDB76B3CB" pageId="9" pageNumber="30">
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<taxonomicName id="4A04F759037394D8C8955E2FA984FA06" class="Bivalvia" family="Myidae" genus="Corbula" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Corbula gracilis" order="Myida" pageId="9" pageNumber="30" phylum="Mollusca" rank="species" species="gracilis">Corbula gracilis</taxonomicName>
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Preston, 1907: 216, fig. 4;
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<bibRefCitation id="6B57982CE3E3E38C6661707AA82B494B" author="Ramakrishna," journalOrPublisher="Zoological Survey of India Occasional Paper" pageId="23" pageNumber="44" pagination="1 - 427" title="Annotated checklist of Indian Marine Molluscs (Cephalopoda, Bivalvia and Scaphopoda) Part 1." volume="320" year="2010">Ramakrishna and Dey 2010</bibRefCitation>
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||
: 270.
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</paragraph>
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<paragraph id="4DB86848FC08375472B634980BBE614C" pageId="9" pageNumber="30">
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<taxonomicName id="7F79164D803D19B0DDEE47929E8160F3" class="Bivalvia" family="Myidae" genus="Corbula" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Corbula pfefferi" order="Myida" pageId="9" pageNumber="30" phylum="Mollusca" rank="species" species="pfefferi">Corbula pfefferi</taxonomicName>
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Preston, 1907: 216, fig. 5.
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</paragraph>
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<paragraph id="EAA7D9E215470F4CD0BE820E38572F2C" pageId="9" pageNumber="30">
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<taxonomicName id="8BBF48508EE594FDD7CFD164221F02E3" class="Bivalvia" family="Myidae" genus="Potamocorbula" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Potamocorbula abbreviata" order="Myida" pageId="9" pageNumber="30" phylum="Mollusca" rank="species" species="abbreviata">Potamocorbula abbreviata</taxonomicName>
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(Preston):
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<bibRefCitation id="12083F56732D233834F49F3AB945E7F4" author="Huber, M" journalOrPublisher="Conchbooks, Hackenheim" pageId="22" pageNumber="43" title="Compendium of bivalves." year="2010">Huber 2010</bibRefCitation>
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: 771;
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<bibRefCitation id="5C90235393AF2EE5B606804E7A49614A" author="Subba Rao, NV" journalOrPublisher="Zoological Survey of India Occasional Paper" pageId="23" pageNumber="44" pagination="1 - 568" title="Indian Seashells, Part 2: Bivalvia." volume="375" year="2017">Subba Rao 2017</bibRefCitation>
|
||
: 431;
|
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<bibRefCitation id="51B2A9A357995CB1BE3BB383C5374304" author="Kumar, S" journalOrPublisher="Molecular Biology and Evolution" pageId="22" pageNumber="43" url="http://marinespecies.org/aphia.php?p=taxdetails&id=505887" year="2018 b">MolluscaBase 2018b</bibRefCitation>
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.
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</paragraph>
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||
</subSubSection>
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||
<subSubSection id="E78D1C881D6229639E4B25D45B4CB6B7" pageId="9" pageNumber="30" type="type material">
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<paragraph id="884936C0A3F03D1DDF1B273BF97E5B88" pageId="9" pageNumber="30">Type material examined.</paragraph>
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<paragraph id="4DDFB2780BB7BF4073AC41984FCF2F1F" pageId="9" pageNumber="30">
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<taxonomicName id="0C70B45F8A8FA4AE8610CC31BFEFD97F" class="Bivalvia" family="Corbulidae" genus="Corbula" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Corbula alcocki" order="Myida" pageId="9" pageNumber="30" phylum="Mollusca" rank="species" species="alcocki">Corbula alcocki</taxonomicName>
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, Syntype, 1 shell, Port Canning, purchased from Preston, HMUK1909.8.18.33.
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</paragraph>
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<paragraph id="C2A10C1F7F26F6C5D72C5F4C1750DA44" pageId="9" pageNumber="30">
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<taxonomicName id="435C4746864955AEB4EFA30C7B2E132D" class="Bivalvia" family="Corbulidae" genus="Corbula" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Corbula gracilis" order="Myida" pageId="9" pageNumber="30" phylum="Mollusca" rank="species" species="gracilis">Corbula gracilis</taxonomicName>
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, Syntype, 1 shell, Port Canning, purchased from Preston, HMUK1909.8.18.32.
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</paragraph>
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<paragraph id="63135A27636AAB503878507FFB7D1FC2" pageId="9" pageNumber="30">
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The type material of
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<taxonomicName id="093CADE02E632E3E0DA926720343638F" lsidName="C. abbreviata" pageId="9" pageNumber="30" rank="species" species="abbreviata">C. abbreviata</taxonomicName>
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,
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<taxonomicName id="9AF4222C3D79641C8752C9880756E011" lsidName="C. calcarea" pageId="9" pageNumber="30" rank="species" species="calcarea">C. calcarea</taxonomicName>
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, and
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<taxonomicName id="CC8BCECF4393940B9455B6244F85F7EE" lsidName="C. pfefferi" pageId="9" pageNumber="30" rank="species" species="pfefferi">C. pfefferi</taxonomicName>
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was not available for study.
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</paragraph>
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</subSubSection>
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<subSubSection id="7D0547C16FEB337FF3A45D4586A5ECB7" lastPageId="10" lastPageNumber="31" pageId="9" pageNumber="30" type="materials_examined">
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<paragraph id="551AA3C56B0858C1261892C681213F97" pageId="9" pageNumber="30">Other material examined.</paragraph>
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<paragraph id="071872D8C2007FD8892F7864E121BD88" pageId="9" pageNumber="30">
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<taxonomicName id="AA0A51CB21E2990707142723BA39CE91" class="Bivalvia" family="Myidae" genus="Sphenia" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Sphenia" order="Myida" pageId="9" pageNumber="30" phylum="Mollusca" rank="genus">Sphenia</taxonomicName>
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sp. 20 shells and single valves, "Port Canning" [can be interpreted as the Matla River at Port Canning], SE of Kolkata,
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<geoCoordinate id="DD35348EC4EEE45531F4F5BB18261BF0" direction="north" orientation="latitude" precision="92" value="22.311666">22°18.7'N</geoCoordinate>
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,
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<geoCoordinate id="9E239118390F38A8378DE977B99B767C" direction="east" orientation="longitude" precision="92" value="88.67667">88°40.6'E</geoCoordinate>
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, ex Godwin-Austin Coll, NHMUK 20170342.
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</paragraph>
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<paragraph id="D4AFDBB0784FD66DCAF05B8722E542EF" pageId="9" pageNumber="30">
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<taxonomicName id="82D28261BB298A09F46072E23BFA8E0C" class="Bivalvia" family="Myidae" genus="Sphenia" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Sphenia" order="Myida" pageId="9" pageNumber="30" phylum="Mollusca" rank="genus">Sphenia</taxonomicName>
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sp. 5 shells and 1 single valve, Pt. Canning, Matla River, ex Blandford Coll, HMUK 20170343.
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</paragraph>
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<paragraph id="901C0DD444F30DA7CFDFED263186DA95" pageId="10" pageNumber="31">
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<taxonomicName id="28DECF684098F10DE43C01A5887A7C22" class="Bivalvia" family="Corbulidae" genus="Corbula" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Corbula intumescens" order="Myida" pageId="10" pageNumber="31" phylum="Mollusca" rank="species" species="intumescens">
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<pageBreakToken id="BD162B61170DAB821A3B4304F3F1C1DB" pageId="10" pageNumber="31" start="start">Corbula</pageBreakToken>
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intumescens
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</taxonomicName>
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manuscript name of Stoliczka. 4 shells. Canning, ex. Dr F. Day, HMUK91.9.19.20-3.
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</paragraph>
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<paragraph id="66BB9A12AF3CC5A1D9900534B8312A6B" pageId="10" pageNumber="31">
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<taxonomicName id="357040005016331409C35AD72451D634" class="Bivalvia" family="Corbulidae" genus="Corbula" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Corbula tumescens" order="Myida" pageId="10" pageNumber="31" phylum="Mollusca" rank="species" species="tumescens">Corbula tumescens</taxonomicName>
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manuscript name of Day 4 shells. Port Canning, NHMUK 88.12.4.703-6.
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</paragraph>
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</subSubSection>
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<subSubSection id="EA5DD50175A284F2ACB8DF74762E6BFD" pageId="10" pageNumber="31" type="type localities">
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||
<paragraph id="BFD9B292FF2E9D03642C802A23E6CF17" pageId="10" pageNumber="31">Type localities.</paragraph>
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<paragraph id="FF392BD4DF7D15EF61C6ED54CA4D1185" pageId="10" pageNumber="31">
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All species described by
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<bibRefCitation id="B8AC291E335DCD2D21560E39F4144F89" author="Preston, HB" journalOrPublisher="Malacologia" pageId="22" pageNumber="43" url="https://doi.org/10.1080/00222930709487259" year="1907">Preston (1907)</bibRefCitation>
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are localised as "Port Canning, Lower Bengal; in brackish pools". Port Canning lies on the Matla River approximately 80 km upstream from the mouth of the estuary. Both the manuscript names of Stoliczka have the same locality of "Port Canning".
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</paragraph>
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</subSubSection>
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||
<subSubSection id="47236F07447CE6EE2308B8A98EA15035" pageId="10" pageNumber="31" type="description">
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<paragraph id="F344E319BFE4EFFDC4F5B21CDF4D78DD" pageId="10" pageNumber="31">Description.</paragraph>
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<paragraph id="75DEA5ABC037830DE8BD868180E1CC79" pageId="10" pageNumber="31">
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Shell (Fig. 5
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<normalizedToken id="6F9A53C82D447238256A1CEB5C0DB1C4" originalValue="a–d">a-d</normalizedToken>
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) small, reaching 10 mm in length, thin, fragile, inequivalve - left valve slightly smaller; slightly inequilateral, beaks slightly to the front of centre (PL/AL = 1.3); moderately inflated (L/T = 2.1). Beaks prosogyrate, directed anteriorly. Outline subovate-sub-rostrate, L/H = 1.6, anterior end broadly rounded, ventral margin curved, posterior end much narrower than anterior end, sub-rostrate. Posterior area demarcated by sharp carina running from beak to ventral margin of rostrate posterior end. Postero-dorsal margin concave. Posterior end rounded, but often eroded and obscured by periostracum extending beyond shell. Sculpture of weak commarginal lines and raised threads forming weak projections on posterior carina.
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</paragraph>
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<caption id="42E691DB24B612616E21E5AA0261B7DB" pageId="10" pageNumber="31">
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||
<paragraph id="C5EDF4B1EE03B6E3CBA4785F000EABDA" pageId="10" pageNumber="31">
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Figure 5. Shell variation in
|
||
<taxonomicName id="F92C8C5E99AD25934E2E5E14CFB6C653" class="Bivalvia" family="Myidae" genus="Indosphenia" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Indosphenia abbreviata" order="Myida" pageId="10" pageNumber="31" phylum="Mollusca" rank="species" species="abbreviata">Indosphenia abbreviata</taxonomicName>
|
||
.
|
||
<normalizedToken id="5E019F8D6E5D4136358251C9DFD36ED6" originalValue="a–d">a-d</normalizedToken>
|
||
typical form from Port Canning, NHMUK 20170342 e, f distorted varieties from Port Canning, NHMUK 20170342 g, h syntype of
|
||
<taxonomicName id="2363188CC8379FC245BB15A665872D5E" class="Bivalvia" family="Corbulidae" genus="Corbula" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Corbula alcocki" order="Myida" pageId="10" pageNumber="31" phylum="Mollusca" rank="species" species="alcocki">Corbula alcocki</taxonomicName>
|
||
Port Canning, NHMUK 1909.8.18.33 i, j syntype of
|
||
<taxonomicName id="28B38EF51FDC7FA765534852775D5AC2" class="Bivalvia" family="Corbulidae" genus="Corbula" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Corbula gracilis" order="Myida" pageId="10" pageNumber="31" phylum="Mollusca" rank="species" species="gracilis">Corbula gracilis</taxonomicName>
|
||
, Port Canning NHMUK 1909.8.18.32
|
||
<normalizedToken id="6CD8F508F67E0AC4380E654DDD3A6001" originalValue="k–m">k-m</normalizedToken>
|
||
syntype of
|
||
<taxonomicName id="9F57F70B2FE56B29DB33311AB8281EEB" class="Bivalvia" family="Cuspidariidae" genus="Cuspidaria" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Cuspidaria annandalei" order="Myida" pageId="10" pageNumber="31" phylum="Mollusca" rank="species" species="annandalei">Cuspidaria annandalei</taxonomicName>
|
||
NMW1955.158.18922. Scale bar: 5 mm.
|
||
</paragraph>
|
||
</caption>
|
||
<paragraph id="162478C5D4BF7D9884BB616E69478D35" pageId="10" pageNumber="31">
|
||
Prodissoconch (Fig. 9b) consisting of small P1 (65
|
||
<normalizedToken id="AFDC617BA66D7180F2DFDB5458B9F43B" originalValue="µm">µm</normalizedToken>
|
||
) and much larger P2 (182
|
||
<normalizedToken id="5F1DB43A0780F94BF0E2A9F2A139BD90" originalValue="µm">µm</normalizedToken>
|
||
); P1 with punctate micro sculpture; P2 with commarginal ridges crossed by sparse radial threads. Hinge myid, with chondrophore in left valve. Chondrophore (Fig. 7a) with proportionately narrow ligament insertion plate and long posterior flange; ridge between ligament area and flange weak. Right valve with very weak pseudo cardinal tooth (Fig. 7g) commonly rising dorsally to obscure beak.
|
||
</paragraph>
|
||
</subSubSection>
|
||
<subSubSection id="51FBD31106320192735FF1FCAF22E636" pageId="10" pageNumber="31" type="intraspecific variation">
|
||
<paragraph id="7C3D3FAFB2938DBBD1FC05404E6BA7A5" pageId="10" pageNumber="31">Intraspecific variation.</paragraph>
|
||
<paragraph id="360099EF9EF1790888AB43B240ADCFD3" pageId="10" pageNumber="31">
|
||
Some shells in the unidentified samples from Port Canning are distorted with the rostrate posterior end upturned (Fig. 5e), while others are truncate posteriorly (Fig. 5f). While the overall outline is different, the hinge remains identical in structure (Fig. 7c). The syntype of
|
||
<taxonomicName id="E536A5B0CE0EA2F7BA456EFBE9E4B3AF" class="Bivalvia" family="Corbulidae" genus="Corbula" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Corbula alcocki" order="Myida" pageId="10" pageNumber="31" phylum="Mollusca" rank="species" species="alcocki">Corbula alcocki</taxonomicName>
|
||
(Fig. 5g, h) represents the posteriorly truncated form, whereas the syntype of
|
||
<taxonomicName id="7AB1C8B0524ED8665C362D2B47187F54" lsidName="C. gracilis" pageId="10" pageNumber="31" rank="species" species="gracilis">C. gracilis</taxonomicName>
|
||
(Fig. 5i, j) is closer to the typical shape. The samples labelled as
|
||
<taxonomicName id="4AAF90D5A64D002F66E1E72ECFDA04EE" class="Bivalvia" family="Myidae" genus="Sphenia" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Sphenia tumescens" order="Myida" pageId="10" pageNumber="31" phylum="Mollusca" rank="species" species="tumescens">Sphenia tumescens</taxonomicName>
|
||
and the sample collected by Blandford, contain larger shells (up to 12 mm in length) (Fig. 6f). Of these, many are more elongate and narrower (Fig. 6
|
||
<normalizedToken id="C00D9CDF8DF89E65C94F479270B1C557" originalValue="a–d">a-d</normalizedToken>
|
||
, g) and with a larger length to height ratio of 1.9, and where the posterior dorsal margin is less concave. Of the species described by
|
||
<bibRefCitation id="DCCC42877184FB796DAB71A4C62DE1A9" author="Preston, HB" journalOrPublisher="Malacologia" pageId="22" pageNumber="43" url="https://doi.org/10.1080/00222930709487259" year="1907">Preston (1907)</bibRefCitation>
|
||
, that of
|
||
<taxonomicName id="4B82E5C11594742BEEA89E865CCF80DD" genus="Myoidea" lsidName="Myoidea calcarea" pageId="10" pageNumber="31" rank="species" species="calcarea">calcarea</taxonomicName>
|
||
may be representative, but it is less than half the size of the shells described here. In one shell, from the
|
||
<taxonomicName id="FB46FA63EA250299D54894667638EE81" genus="Myoidea" lsidName="Myoidea tumescens" pageId="10" pageNumber="31" rank="species" species="tumescens">tumescens</taxonomicName>
|
||
sample, radial striations are present (Fig. 6e), most visible on the interior (
|
||
<normalizedToken id="AD0FF5955E13B6F9D1D7C5BFA3FD9342" originalValue="Preston’s">Preston's</normalizedToken>
|
||
<taxonomicName id="F87CE214CBFED7BA528C243F37FA16AB" genus="Myoidea" lsidName="Myoidea pfefferi" pageId="10" pageNumber="31" rank="species" species="pfefferi">pfefferi</taxonomicName>
|
||
form). The prodissoconch (Fig. 9a) is identical to that of the typical form in having a radial sculpture.
|
||
</paragraph>
|
||
<caption id="5AA108EDCAE0858A1DF3C5E8692651F5" pageId="10" pageNumber="31">
|
||
<paragraph id="361BEF6542E7864897E42FDE3F0D9469" pageId="10" pageNumber="31">
|
||
Figure 6. Variations of
|
||
<taxonomicName id="869C23071CA5A8D1E087F93468D6FACB" class="Bivalvia" family="Myidae" genus="Indosphenia" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Indosphenia abbreviata" order="Myida" pageId="10" pageNumber="31" phylum="Mollusca" rank="species" species="abbreviata">Indosphenia abbreviata</taxonomicName>
|
||
all from Port Canning. a, b narrow form, NHMUK 20170343
|
||
<normalizedToken id="648F8A99CCF2800004E3698AE307685F" originalValue="d–ftumescence">d-ftumescence</normalizedToken>
|
||
form NHMUK 88.12.4.703 e Scanning electron micrograph of interior of d showing radial ridges gintumescence form NHMUK 91.9.19.20. Scale bar: 5 mm.
|
||
</paragraph>
|
||
</caption>
|
||
<caption id="AD6F6E4D55EB9A0A2DCB98D392B3DA9F" pageId="10" pageNumber="31">
|
||
<paragraph id="09580E01441EDA37074B65F7FF1F468B" pageId="10" pageNumber="31">
|
||
Figure 7. Scanning electron micrographs of the hinges of
|
||
<taxonomicName id="33AE6F39F1635E94EFBD044472BB4096" class="Bivalvia" family="Myidae" genus="Indosphenia" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Indosphenia" order="Myida" pageId="10" pageNumber="31" phylum="Mollusca" rank="genus">Indosphenia</taxonomicName>
|
||
species. a chondrophore of
|
||
<taxonomicName id="345FFD585CF9BBF052386912AB5E7904" lsidName="I. abbreviata" pageId="10" pageNumber="31" rank="species" species="abbreviata">I. abbreviata</taxonomicName>
|
||
typical form from Port Canning b as a but from narrow form c as a but from distorted form d chondrophore of syntype of
|
||
<taxonomicName id="06BC2D2F48C300FCF470F4D5C2AD7A73" class="Bivalvia" family="Cuspidariidae" genus="Cuspidaria" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Cuspidaria annandalei" order="Myida" pageId="10" pageNumber="31" phylum="Mollusca" rank="species" species="annandalei">Cuspidaria annandalei</taxonomicName>
|
||
e chondrophore of
|
||
<taxonomicName id="B3E9BB3299756B262D590F4F78AE0A3F" lsidName="I. sowerbyi" pageId="10" pageNumber="31" rank="species" species="sowerbyi">I. sowerbyi</taxonomicName>
|
||
from Adyar f as e but from Cooum g right valve pseudo tooth in
|
||
<taxonomicName id="A3D6191DCE7D359501A4C9B7E2D3169C" lsidName="I. abbreviata" pageId="10" pageNumber="31" rank="species" species="abbreviata">I. abbreviata</taxonomicName>
|
||
h right valve pseudotooth in syntype of
|
||
<taxonomicName id="CCA92F933080FC2DCED3D1772445FF7E" class="Bivalvia" family="Cuspidariidae" genus="Cuspidaria" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Cuspidaria annandalei" order="Myida" pageId="10" pageNumber="31" phylum="Mollusca" rank="species" species="annandalei">Cuspidaria annandalei</taxonomicName>
|
||
i right valve pseudotooth in
|
||
<taxonomicName id="405AB186BB4AD7B12B1D3E48C87862D2" lsidName="I. sowerbyi" pageId="10" pageNumber="31" rank="species" species="sowerbyi">I. sowerbyi</taxonomicName>
|
||
<normalizedToken id="889CEFD31639F68F24CA729CD2236EF5" originalValue="j–k">j-k</normalizedToken>
|
||
chondrophores in small and large specimens of
|
||
<taxonomicName id="F13BDB1248D799A674B63848DF5CBCFA" lsidName="I. kayalum" pageId="10" pageNumber="31" rank="species" species="kayalum">I. kayalum</taxonomicName>
|
||
<normalizedToken id="78033593FF75DE8B651501E3A5BBE048" originalValue="l–m">l-m</normalizedToken>
|
||
right valve pseudo tooth small and large specimens of
|
||
<taxonomicName id="F05D16E7708A5300B3805116AE39688A" lsidName="I. kayalum" pageId="10" pageNumber="31" rank="species" species="kayalum">I. kayalum</taxonomicName>
|
||
<normalizedToken id="69F38D7A624617BD22BD50EE313F613F" originalValue="n–o">n-o</normalizedToken>
|
||
chondrophore and right valve pseudo tooth of
|
||
<taxonomicName id="A8DA4537CD85908EB01AAAF4082CC851" lsidName="I. cochinensis" pageId="10" pageNumber="31" rank="species" species="cochinensis">I. cochinensis</taxonomicName>
|
||
. Scale bar: 5 mm.
|
||
</paragraph>
|
||
</caption>
|
||
</subSubSection>
|
||
<subSubSection id="DB089F1F9F1CF830635648EFA145A69E" lastPageId="12" lastPageNumber="33" pageId="10" pageNumber="31" type="remarks">
|
||
<paragraph id="6595EB56D6DD66C2D8383EC86D611E5B" pageId="10" pageNumber="31">Remarks.</paragraph>
|
||
<paragraph id="7BDDE911856CBAA0A6E4606B2D133AB4" pageId="10" pageNumber="31">
|
||
The shells from Port Canning are highly variable, with many showing distortions of some degree, although the overall form is broadly rounded with a deep anterior end and a sub-rostrate posterior end. Some samples contain a higher proportion of shells that are less deep and more elongate, and these have the manuscript names of
|
||
<taxonomicName id="5A8E71A1F67C31C921132303EF4E14CF" genus="Myoidea" lsidName="Myoidea tumescens" pageId="10" pageNumber="31" rank="species" species="tumescens">tumescens</taxonomicName>
|
||
Stolizcka and
|
||
<taxonomicName id="5A37D47C5D242CDE92F1646C088C55E0" genus="Myoidea" lsidName="Myoidea intumescens" pageId="10" pageNumber="31" rank="species" species="intumescens">intumescens</taxonomicName>
|
||
Day.
|
||
</paragraph>
|
||
<paragraph id="3EFD099F01BD8CE4FEE7272DC7CCFC73" pageId="10" pageNumber="31">While the extremes of this form look very different, there are intergrades, and in all of these the prodissoconch has the same pattern of radial striations.</paragraph>
|
||
<paragraph id="C62E0286BD92ED25A324D491AD972C47" lastPageId="12" lastPageNumber="33" pageId="11" pageNumber="32">
|
||
<pageBreakToken id="1169762D5A2CE4A54BAD213C4606A0B7" pageId="11" pageNumber="32" start="start">While</pageBreakToken>
|
||
Port Canning is given as the locality, the precise habitat is not provided for these samples, although one does mention the Matla River.
|
||
<bibRefCitation id="29F4261F0FD34F93EF5C9EDCC0D66813" author="Preston, HB" journalOrPublisher="Malacologia" pageId="22" pageNumber="43" url="https://doi.org/10.1080/00222930709487259" year="1907">Preston (1907)</bibRefCitation>
|
||
stated that his species came from brackish pools, so it may be that this species inhabits a range of habitats within the Matla River estuary. Port Canning is some 80 km from the open sea of the Bay of Bengal and is undoubtedly subject to much variation in salinity, certainly between isolated pools and the main river channel. Without supporting molecular data, we regard these forms to be part of a single species. The earliest available name for this taxon is
|
||
<taxonomicName id="168F4F799EE28FB7204891550A4B7D44" genus="Myoidea" lsidName="Myoidea abbreviata" pageId="11" pageNumber="32" rank="species" species="abbreviata">abbreviata</taxonomicName>
|
||
Preston, 1907, which is based on individuals that in the context of the current sample set may not be typical, in having the posterior end shortened.
|
||
<pageBreakToken id="FF7F84CB3F6F365CCFC3DEFEBE97CD41" pageId="12" pageNumber="33" start="start">However</pageBreakToken>
|
||
, we consider that
|
||
<bibRefCitation id="11AFDA1280E354B9E3CA1EF9DD0077C1" author="Huber, M" journalOrPublisher="Conchbooks, Hackenheim" pageId="22" pageNumber="43" title="Compendium of bivalves." year="2010">Huber (2010)</bibRefCitation>
|
||
was the first reviser of this group of species and we therefore retain the earliest name and the one given priority by him. This is also the name adopted by
|
||
<bibRefCitation id="B9BCB21A0813EA6205DA6389B5A3E381" author="Subba Rao, NV" journalOrPublisher="Zoological Survey of India Occasional Paper" pageId="23" pageNumber="44" pagination="1 - 568" title="Indian Seashells, Part 2: Bivalvia." volume="375" year="2017">Subba Rao (2017)</bibRefCitation>
|
||
.
|
||
</paragraph>
|
||
</subSubSection>
|
||
</treatment>
|
||
</document> |