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<mods:title id="C736FDF95ABD54465641EB8D92778164">Unloved, paraphyletic or misplaced: new genera and species of small to minute lucinid bivalves and their relationships (Bivalvia, Lucinidae)</mods:title>
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<mods:namePart>Glover, Emily A.</mods:namePart>
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<treatment ID-GBIF-Taxon="160702950" LSID="urn:lsid:plazi:treatment:07F2635DC6735922AC754BBF54EE315E" httpUri="http://treatment.plazi.org/id/07F2635DC6735922AC754BBF54EE315E" lastPageNumber="109" pageId="0" pageNumber="109">
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<taxonomicName LSID="07F2635D-C673-5922-AC75-4BBF54EE315E" authority="Melvill, 1918" authorityName="Melvill" authorityYear="1918" family="Lucinidae" higherTaxonomySource="treatment-meta" kingdom="Animalia" lsidName="'Rugalucina' cypselis" order="Lucinida" pageId="0" pageNumber="109" rank="species" species="cypselis">
<normalizedToken originalValue="Rugalucina">'Rugalucina'</normalizedToken>
<treatment id="07F2635DC6735922AC754BBF54EE315E" ID-GBIF-Taxon="160702950" LSID="urn:lsid:plazi:treatment:07F2635DC6735922AC754BBF54EE315E" httpUri="http://treatment.plazi.org/id/07F2635DC6735922AC754BBF54EE315E" lastPageNumber="109" pageId="0" pageNumber="109" scope_class="Bivalvia" scope_family="Lucinidae" scope_genus="Rugalucina" scope_subFamily="Lucininae">
<subSubSection id="D440559F274E5F3FE9F1AD8DE109F875" pageId="0" pageNumber="109" type="nomenclature">
<paragraph id="10CBCAF9655A513258C418C88C8CD036" pageId="0" pageNumber="109">
<taxonomicName id="3011B6AF14953C5B28AC803EDF31F6BE" ID-CoL="7T366" LSID="07F2635D-C673-5922-AC75-4BBF54EE315E" authority="Melvill, 1918" authorityName="Melvill" authorityYear="1918" class="Bivalvia" family="Lucinidae" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="'Rugalucina' cypselis" order="Lucinida" pageId="0" pageNumber="109" phylum="Mollusca" rank="species" species="cypselis">
<normalizedToken id="425280672DCB0AC9F0E6A278A7085822" originalValue="Rugalucina">'Rugalucina'</normalizedToken>
cypselis (Melvill, 1918)
</taxonomicName>
<figureCitation captionStart="Figure 3" captionStartId="F3" captionText="Figure 3. Internal drawings of left valves of Rugalucina and Pusillolucina species. Not to scale." figureDoi="10.3897/zookeys.899.47070.figure3" httpUri="https://binary.pensoft.net/fig/364610" pageId="0" pageNumber="109" tableDoi="10.3897/zookeys.899.47070.figure3">Figs 3</figureCitation>
<figureCitation id="80A124AEA946FF772445773F9680D6B0" captionStart="Figure 3" captionStartId="F3" captionText="Figure 3. Internal drawings of left valves of Rugalucina and Pusillolucina species. Not to scale." figureDoi="10.3897/zookeys.899.47070.figure3" httpUri="https://binary.pensoft.net/fig/364610" pageId="0" pageNumber="109" tableDoi="10.3897/zookeys.899.47070.figure3">Figs 3</figureCitation>
,
<figureCitation captionStart="Figure 6" captionStartId="F6" captionText="Figure 6. ' Rugalucina ' cypselis (Melvill, 1918). A-D Holotype Divaricella cypselis Melvill, 1918 (NHMUK 1921. 1. 28. 92), Karachi, L 5.2 mm E-L ' Rugalucina ' cypselis Karachi (NHMUK 20191075) Winckworth collection E right valve, L 3.1 mm, ob - oblique commarginal lamellae F left valve, L 3.0 mm G right valve, L 3.2 mm H dorsal view, L 1.9 mm I interior left valve, L 3.2 mm J interior right valve, L 3.2 mm K interior left valve, L 3.0 mm L protoconch M detail of ventral margin (F) showing obliquely aligned commarginal lamellae. Scale bar: 100 µm (L); 1 mm (M)." figureDoi="10.3897/zookeys.899.47070.figure6" httpUri="https://binary.pensoft.net/fig/364613" pageId="0" pageNumber="109" tableDoi="10.3897/zookeys.899.47070.figure6">6</figureCitation>
<figureCitation id="E3F5E68514BFF1178084404BA9F54FA0" captionStart="Figure 6" captionStartId="F6" captionText="Figure 6. ' Rugalucina ' cypselis (Melvill, 1918). A-D Holotype Divaricella cypselis Melvill, 1918 (NHMUK 1921. 1. 28. 92), Karachi, L 5.2 mm E-L ' Rugalucina ' cypselis Karachi (NHMUK 20191075) Winckworth collection E right valve, L 3.1 mm, ob - oblique commarginal lamellae F left valve, L 3.0 mm G right valve, L 3.2 mm H dorsal view, L 1.9 mm I interior left valve, L 3.2 mm J interior right valve, L 3.2 mm K interior left valve, L 3.0 mm L protoconch M detail of ventral margin (F) showing obliquely aligned commarginal lamellae. Scale bar: 100 µm (L); 1 mm (M)." figureDoi="10.3897/zookeys.899.47070.figure6" httpUri="https://binary.pensoft.net/fig/364613" pageId="0" pageNumber="109" tableDoi="10.3897/zookeys.899.47070.figure6">6</figureCitation>
</paragraph>
</subSubSection>
<subSubSection pageId="0" pageNumber="109" type="reference_group">
<paragraph pageId="0" pageNumber="109">
<taxonomicName class="Bivalvia" family="Lucinidae" genus="Divaricella" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Divaricella cypselis" order="Lucinida" pageId="0" pageNumber="109" phylum="Mollusca" rank="species" species="cypselis">Divaricella cypselis</taxonomicName>
<subSubSection id="3DF85BDE22F5FFBA8835F903A2B0FFCE" pageId="0" pageNumber="109" type="reference_group">
<paragraph id="5D0A8A806967DF4212A56C9A2AC575E5" pageId="0" pageNumber="109">
<taxonomicName id="0E9C4DA92B31206525E2E0801DDBAF5F" class="Bivalvia" family="Lucinidae" genus="Divaricella" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Divaricella cypselis" order="Lucinida" pageId="0" pageNumber="109" phylum="Mollusca" rank="species" species="cypselis">Divaricella cypselis</taxonomicName>
Melvill, 1918: 156, pl. 5, fig. 33.
</paragraph>
</subSubSection>
<subSubSection pageId="0" pageNumber="109" type="type material">
<paragraph pageId="0" pageNumber="109">Type material.</paragraph>
<paragraph pageId="0" pageNumber="109">
<taxonomicName lsidName="D. cypselis" pageId="0" pageNumber="109" rank="species" species="cypselis">
<emphasis italics="true" pageId="0" pageNumber="109">D. cypselis</emphasis>
<subSubSection id="C17C050B3E255C9F13DD88DE8ABF0DA2" pageId="0" pageNumber="109" type="type material">
<paragraph id="4A849F594C73F094339A8D507A142382" pageId="0" pageNumber="109">Type material.</paragraph>
<paragraph id="F796ECEF8C5D72ED86E4A7B085755CFE" pageId="0" pageNumber="109">
<taxonomicName id="4F3FDB5B64F88634569E0040EE7999FA" lsidName="D. cypselis" pageId="0" pageNumber="109" rank="species" species="cypselis">
<emphasis id="C53B5ED7A2DF6C8BF41F8B3970E1E5F6" italics="true" pageId="0" pageNumber="109">D. cypselis</emphasis>
</taxonomicName>
holotype NHMUK 1921.1.28.42. sh, L 5.2 mm.
</paragraph>
</subSubSection>
<subSubSection pageId="0" pageNumber="109" type="type locality">
<paragraph pageId="0" pageNumber="109">Type locality.</paragraph>
<paragraph pageId="0" pageNumber="109">Karachi, Pakistan, 20-30 fathoms (36-55 m).</paragraph>
<subSubSection id="379BE5A715AA95C8148F881810F610F8" pageId="0" pageNumber="109" type="type locality">
<paragraph id="F302C388F0E45B06EDFD40D2ECE38EE5" pageId="0" pageNumber="109">Type locality.</paragraph>
<paragraph id="D674600465E7C55B5E1A61FD7199892B" pageId="0" pageNumber="109">Karachi, Pakistan, 20-30 fathoms (36-55 m).</paragraph>
</subSubSection>
<subSubSection pageId="0" pageNumber="109" type="materials_examined">
<paragraph pageId="0" pageNumber="109">Other material examined.</paragraph>
<paragraph pageId="0" pageNumber="109">
<emphasis bold="true" pageId="0" pageNumber="109">Pakistan</emphasis>
<subSubSection id="465A3AF063882D02DC9ED51741D8578C" pageId="0" pageNumber="109" type="materials_examined">
<paragraph id="FD27766992241C04B797EE26FB657F14" pageId="0" pageNumber="109">Other material examined.</paragraph>
<paragraph id="A6AAA98BCF5644102F25387EB2B0BECE" pageId="0" pageNumber="109">
<emphasis id="736EAD9FACD35E09997C8F25D617E9FC" bold="true" pageId="0" pageNumber="109">Pakistan</emphasis>
: Karachi, Winckworth collection (NHMUK 20191075) 55 sh, 52 v.
<emphasis bold="true" pageId="0" pageNumber="109">India</emphasis>
<emphasis id="7A72518E6DB0870C5E0008C02DA96CC2" bold="true" pageId="0" pageNumber="109">India</emphasis>
: dredged Chennai (Madras), Winckworth Collection (NHMUK 1958.1.30.45) 1 sh. Chennai (Madras) (NHMUK 1953.1.30.169-73 part) 5 v.
</paragraph>
</subSubSection>
<subSubSection pageId="0" pageNumber="109" type="description">
<paragraph pageId="0" pageNumber="109">Description.</paragraph>
<paragraph pageId="0" pageNumber="109">
<subSubSection id="9A8DB9C26A82B2D5E5827D67AD7C6032" pageId="0" pageNumber="109" type="description">
<paragraph id="903514E19A2217B194E632C9B9F3E328" pageId="0" pageNumber="109">Description.</paragraph>
<paragraph id="1F8937F439FF0C8586BF89704E8E057D" pageId="0" pageNumber="109">
Small (L to 5.2 mm), sub-circular, inflated. Colour white or yellowish. Sculpture of diverging, curved, radial ribs prominent to anterior and posterior but are subdued or absent in middle parts of shell. Ribs crossed by closely spaced, narrow, low, commarginal lamellae that are aligned obliquely to the ventral shell margin (
<figureCitation captionStart="Figure 6" captionStartId="F6" captionText="Figure 6. ' Rugalucina ' cypselis (Melvill, 1918). A-D Holotype Divaricella cypselis Melvill, 1918 (NHMUK 1921. 1. 28. 92), Karachi, L 5.2 mm E-L ' Rugalucina ' cypselis Karachi (NHMUK 20191075) Winckworth collection E right valve, L 3.1 mm, ob - oblique commarginal lamellae F left valve, L 3.0 mm G right valve, L 3.2 mm H dorsal view, L 1.9 mm I interior left valve, L 3.2 mm J interior right valve, L 3.2 mm K interior left valve, L 3.0 mm L protoconch M detail of ventral margin (F) showing obliquely aligned commarginal lamellae. Scale bar: 100 µm (L); 1 mm (M)." figureDoi="10.3897/zookeys.899.47070.figure6" httpUri="https://binary.pensoft.net/fig/364613" pageId="0" pageNumber="109" tableDoi="10.3897/zookeys.899.47070.figure6">Fig. 6M</figureCitation>
<figureCitation id="398A223A17AA856EC12073460A22F6E8" captionStart="Figure 6" captionStartId="F6" captionText="Figure 6. ' Rugalucina ' cypselis (Melvill, 1918). A-D Holotype Divaricella cypselis Melvill, 1918 (NHMUK 1921. 1. 28. 92), Karachi, L 5.2 mm E-L ' Rugalucina ' cypselis Karachi (NHMUK 20191075) Winckworth collection E right valve, L 3.1 mm, ob - oblique commarginal lamellae F left valve, L 3.0 mm G right valve, L 3.2 mm H dorsal view, L 1.9 mm I interior left valve, L 3.2 mm J interior right valve, L 3.2 mm K interior left valve, L 3.0 mm L protoconch M detail of ventral margin (F) showing obliquely aligned commarginal lamellae. Scale bar: 100 µm (L); 1 mm (M)." figureDoi="10.3897/zookeys.899.47070.figure6" httpUri="https://binary.pensoft.net/fig/364613" pageId="0" pageNumber="109" tableDoi="10.3897/zookeys.899.47070.figure6">Fig. 6M</figureCitation>
). Radial ribs with small scales where crossed by commarginal lamellae. Early parts of shell relatively smooth. Protoconch P1 ca 88
<normalizedToken originalValue="µm">µm</normalizedToken>
<normalizedToken id="789D916CD02D1046BA04DB7ED3918D04" originalValue="µm">µm</normalizedToken>
, P2 ca 170
<normalizedToken originalValue="µm">µm</normalizedToken>
<normalizedToken id="C0394212469FCE9704CE33840A9CD4EE" originalValue="µm">µm</normalizedToken>
with growth increments (
<figureCitation captionStart="Figure 6" captionStartId="F6" captionText="Figure 6. ' Rugalucina ' cypselis (Melvill, 1918). A-D Holotype Divaricella cypselis Melvill, 1918 (NHMUK 1921. 1. 28. 92), Karachi, L 5.2 mm E-L ' Rugalucina ' cypselis Karachi (NHMUK 20191075) Winckworth collection E right valve, L 3.1 mm, ob - oblique commarginal lamellae F left valve, L 3.0 mm G right valve, L 3.2 mm H dorsal view, L 1.9 mm I interior left valve, L 3.2 mm J interior right valve, L 3.2 mm K interior left valve, L 3.0 mm L protoconch M detail of ventral margin (F) showing obliquely aligned commarginal lamellae. Scale bar: 100 µm (L); 1 mm (M)." figureDoi="10.3897/zookeys.899.47070.figure6" httpUri="https://binary.pensoft.net/fig/364613" pageId="0" pageNumber="109" tableDoi="10.3897/zookeys.899.47070.figure6">Fig. 6L</figureCitation>
<figureCitation id="47ADC7BFC6BF3A2056A252735BC37426" captionStart="Figure 6" captionStartId="F6" captionText="Figure 6. ' Rugalucina ' cypselis (Melvill, 1918). A-D Holotype Divaricella cypselis Melvill, 1918 (NHMUK 1921. 1. 28. 92), Karachi, L 5.2 mm E-L ' Rugalucina ' cypselis Karachi (NHMUK 20191075) Winckworth collection E right valve, L 3.1 mm, ob - oblique commarginal lamellae F left valve, L 3.0 mm G right valve, L 3.2 mm H dorsal view, L 1.9 mm I interior left valve, L 3.2 mm J interior right valve, L 3.2 mm K interior left valve, L 3.0 mm L protoconch M detail of ventral margin (F) showing obliquely aligned commarginal lamellae. Scale bar: 100 µm (L); 1 mm (M)." figureDoi="10.3897/zookeys.899.47070.figure6" httpUri="https://binary.pensoft.net/fig/364613" pageId="0" pageNumber="109" tableDoi="10.3897/zookeys.899.47070.figure6">Fig. 6L</figureCitation>
). Lunule broadly lanceolate, smooth. Ligament largely internal, short, set on oblique resilifer. Hinge: right valve with single cardinal tooth and prominent anterior and posterior lateral teeth; left valve with two cardinal teeth, the anterior larger and sockets for anterior and posterior lateral teeth. Anterior adductor muscle scar, short, broad, ventrally detached from pallial line for ca. 15 % of length, posterior scar ovoid. Pallial blood vessel scar visible. Pallial line discontinuous in small blocks. Shell margin dentate, coarser towards anterior and posterior.
</paragraph>
</subSubSection>
<subSubSection pageId="0" pageNumber="109" type="distribution">
<paragraph pageId="0" pageNumber="109">Distribution.</paragraph>
<paragraph pageId="0" pageNumber="109">Known from the northern Arabian Sea and southern India. Probably more abundant in the northern Indian Ocean but unrecognised.</paragraph>
<subSubSection id="DDA9072DEE79BE24303EBF9456B5D600" pageId="0" pageNumber="109" type="distribution">
<paragraph id="CC3FAA553D1099C1B878862419E3CC4A" pageId="0" pageNumber="109">Distribution.</paragraph>
<paragraph id="26FE45FECD3DDC7752F28DB18B7ADD91" pageId="0" pageNumber="109">Known from the northern Arabian Sea and southern India. Probably more abundant in the northern Indian Ocean but unrecognised.</paragraph>
</subSubSection>
<subSubSection pageId="0" pageNumber="109" type="remarks">
<paragraph pageId="0" pageNumber="109">Remarks.</paragraph>
<paragraph pageId="0" pageNumber="109">
<bibRefCitation author="Dekker, H" journalOrPublisher="Vita Marina" pageId="0" pageNumber="109" pagination="1 - 12" refId="B14" refString="Dekker, H, Goud, J, 1995. Review of the Indo-West Pacific species of Divaricella sensu auct. with descriptions of two new species and a summary of the species from other regions. Vita Marina 43: 1 - 12" title="Review of the Indo-West Pacific species of Divaricella sensu auct. with descriptions of two new species and a summary of the species from other regions." volume="43" year="1995">Dekker and Goud (1995</bibRefCitation>
<subSubSection id="BADE38F4BD3CEEEF2A9A6F4105710A63" pageId="0" pageNumber="109" type="remarks">
<paragraph id="DDF9D3D9C8E6F6E925DF22DC9893FC8B" pageId="0" pageNumber="109">Remarks.</paragraph>
<paragraph id="8EB9EDAEFFCC8377315B76FA433E9B7B" pageId="0" pageNumber="109">
<bibRefCitation id="E8D5DCCD39F55E7BE88BA32750589879" author="Dekker, H" journalOrPublisher="Vita Marina" pageId="0" pageNumber="109" pagination="1 - 12" refId="B14" refString="Dekker, H, Goud, J, 1995. Review of the Indo-West Pacific species of Divaricella sensu auct. with descriptions of two new species and a summary of the species from other regions. Vita Marina 43: 1 - 12" title="Review of the Indo-West Pacific species of Divaricella sensu auct. with descriptions of two new species and a summary of the species from other regions." volume="43" year="1995">Dekker and Goud (1995</bibRefCitation>
: 6) excluded
<taxonomicName lsidName="D. cypselis" pageId="0" pageNumber="109" rank="species" species="cypselis">
<emphasis italics="true" pageId="0" pageNumber="109">D. cypselis</emphasis>
<taxonomicName id="D6F370B86646BF41B8BECD80015362BB" lsidName="D. cypselis" pageId="0" pageNumber="109" rank="species" species="cypselis">
<emphasis id="186A455C02B33E61A1A2170F53922A96" italics="true" pageId="0" pageNumber="109">D. cypselis</emphasis>
</taxonomicName>
from
<taxonomicName class="Bivalvia" family="Lucinidae" genus="Divaricella" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Divaricella" order="Lucinida" pageId="0" pageNumber="109" phylum="Mollusca" rank="genus">
<emphasis italics="true" pageId="0" pageNumber="109">Divaricella</emphasis>
<taxonomicName id="1829BFAB29C3D999619A5F00908507D1" class="Bivalvia" family="Lucinidae" genus="Divaricella" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Divaricella" order="Lucinida" pageId="0" pageNumber="109" phylum="Mollusca" rank="genus">
<emphasis id="7563CB3E66B5181826DAB07DB99703AC" italics="true" pageId="0" pageNumber="109">Divaricella</emphasis>
</taxonomicName>
more correctly suggesting placement in
<taxonomicName class="Bivalvia" family="Lucinidae" genus="Pillucina" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Pillucina" order="Lucinida" pageId="0" pageNumber="109" phylum="Mollusca" rank="genus">
<emphasis italics="true" pageId="0" pageNumber="109">Pillucina</emphasis>
<taxonomicName id="7EBA63D0E785E2D35C8D7AC8618F83CB" class="Bivalvia" family="Lucinidae" genus="Pillucina" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Pillucina" order="Lucinida" pageId="0" pageNumber="109" phylum="Mollusca" rank="genus">
<emphasis id="4E9E80273F8B9848ED82CE5188A0E434" italics="true" pageId="0" pageNumber="109">Pillucina</emphasis>
</taxonomicName>
. Whereas previously we included
<taxonomicName class="Bivalvia" family="Lucinidae" genus="Divaricella" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Divaricella cypselis" order="Lucinida" pageId="0" pageNumber="109" phylum="Mollusca" rank="species" species="cypselis">
<emphasis italics="true" pageId="0" pageNumber="109">Divaricella cypselis</emphasis>
<taxonomicName id="3E495AB44349B089456B58BDCB4DAEED" class="Bivalvia" family="Lucinidae" genus="Divaricella" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Divaricella cypselis" order="Lucinida" pageId="0" pageNumber="109" phylum="Mollusca" rank="species" species="cypselis">
<emphasis id="EF58BE30F5566C9AA496D8A67A95D862" italics="true" pageId="0" pageNumber="109">Divaricella cypselis</emphasis>
</taxonomicName>
in the synonymy of
<taxonomicName class="Bivalvia" family="Lucinidae" genus="Pillucina" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Pillucina angela" order="Lucinida" pageId="0" pageNumber="109" phylum="Mollusca" rank="species" species="angela">
<emphasis italics="true" pageId="0" pageNumber="109">Pillucina angela</emphasis>
<taxonomicName id="9FE2604472758FA8B3D0F80922323B4A" class="Bivalvia" family="Lucinidae" genus="Pillucina" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Pillucina angela" order="Lucinida" pageId="0" pageNumber="109" phylum="Mollusca" rank="species" species="angela">
<emphasis id="283E206445DA051F376B2ECFA45D37F4" italics="true" pageId="0" pageNumber="109">Pillucina angela</emphasis>
</taxonomicName>
because of the similarity of external sculpture (
<bibRefCitation DOI="https://doi.org/10.3853/j.0067-1975.53.2001.1349" author="Glover, EA" journalOrPublisher="Records of the Australian Museum" pageId="0" pageNumber="109" pagination="263 - 292" refId="B18" refString="Glover, EA, Taylor, JD, 2001. Systematic revision of Australian and Indo-Pacific Lucinidae (Mollusca: Bivalvia): Pillucina, Wallucina and descriptions of two new genera and four new species. Records of the Australian Museum 53: 263 - 292" title="Systematic revision of Australian and Indo-Pacific Lucinidae (Mollusca: Bivalvia): Pillucina, Wallucina and descriptions of two new genera and four new species." url="https://doi.org/10.3853/j.0067-1975.53.2001.1349" volume="53" year="2001">Glover and Taylor 2001</bibRefCitation>
<bibRefCitation id="8FEECBF9F7AAC8454686E4F1E5818D02" DOI="https://doi.org/10.3853/j.0067-1975.53.2001.1349" author="Glover, EA" journalOrPublisher="Records of the Australian Museum" pageId="0" pageNumber="109" pagination="263 - 292" refId="B18" refString="Glover, EA, Taylor, JD, 2001. Systematic revision of Australian and Indo-Pacific Lucinidae (Mollusca: Bivalvia): Pillucina, Wallucina and descriptions of two new genera and four new species. Records of the Australian Museum 53: 263 - 292" title="Systematic revision of Australian and Indo-Pacific Lucinidae (Mollusca: Bivalvia): Pillucina, Wallucina and descriptions of two new genera and four new species." url="https://doi.org/10.3853/j.0067-1975.53.2001.1349" volume="53" year="2001">Glover and Taylor 2001</bibRefCitation>
) we now recognise it as a morphologically distinct species. The holotype and other specimens from the Karachi area all have a very short anterior adductor muscle scar (
<figureCitation captionStart="Figure 3" captionStartId="F3" captionText="Figure 3. Internal drawings of left valves of Rugalucina and Pusillolucina species. Not to scale." figureDoi="10.3897/zookeys.899.47070.figure3" httpUri="https://binary.pensoft.net/fig/364610" pageId="0" pageNumber="109" tableDoi="10.3897/zookeys.899.47070.figure3">Figs 3</figureCitation>
<figureCitation id="72D19BC306D5F906E9002D211DDE1590" captionStart="Figure 3" captionStartId="F3" captionText="Figure 3. Internal drawings of left valves of Rugalucina and Pusillolucina species. Not to scale." figureDoi="10.3897/zookeys.899.47070.figure3" httpUri="https://binary.pensoft.net/fig/364610" pageId="0" pageNumber="109" tableDoi="10.3897/zookeys.899.47070.figure3">Figs 3</figureCitation>
,
<figureCitation captionStart="Figure 7" captionStartId="F7" captionText="Figure 7. ' Rugalucina ' cracentis sp. nov. A-E Lucina concinna Holotype (ZMC I. 100470) Gulf of Suez, exterior and interior of right and left valves and dorsal view, L 9.2 mm F-H ' Rugalucina cracentis ' exterior of right valve and interior of right and left valves Egypt, Dahab, Gulf of Aqaba, Red Sea. H. Blatterer colln, L 6.7 mm I, J R. cracentis exterior and interior of right valve Dahab, Gulf of Aqaba, Red Sea, H. Blatterer colln, L 8.5 mm K, L R cracentis exterior and interior of left valve Egypt, 4 km north of Port Safaga, H. Dekker colln 6930, L 8.3 mm M interior of right valve, L 8.8 mm N, O exterior and interior left valve Egypt, 4 km north of Port Safaga, H. Dekker colln 6930, L 7.1 mm P, Q interiors of right and left valves, H. Dekker colln 6930, L 8.7 mm R, S hinge details of P and Q." figureDoi="10.3897/zookeys.899.47070.figure7" httpUri="https://binary.pensoft.net/fig/364614" pageId="0" pageNumber="109" tableDoi="10.3897/zookeys.899.47070.figure7">
<figureCitation id="F2F954DDDB8E09E1F94830A3B51D03E9" captionStart="Figure 7" captionStartId="F7" captionText="Figure 7. ' Rugalucina ' cracentis sp. nov. A-E Lucina concinna Holotype (ZMC I. 100470) Gulf of Suez, exterior and interior of right and left valves and dorsal view, L 9.2 mm F-H ' Rugalucina cracentis ' exterior of right valve and interior of right and left valves Egypt, Dahab, Gulf of Aqaba, Red Sea. H. Blatterer colln, L 6.7 mm I, J R. cracentis exterior and interior of right valve Dahab, Gulf of Aqaba, Red Sea, H. Blatterer colln, L 8.5 mm K, L R cracentis exterior and interior of left valve Egypt, 4 km north of Port Safaga, H. Dekker colln 6930, L 8.3 mm M interior of right valve, L 8.8 mm N, O exterior and interior left valve Egypt, 4 km north of Port Safaga, H. Dekker colln 6930, L 7.1 mm P, Q interiors of right and left valves, H. Dekker colln 6930, L 8.7 mm R, S hinge details of P and Q." figureDoi="10.3897/zookeys.899.47070.figure7" httpUri="https://binary.pensoft.net/fig/364614" pageId="0" pageNumber="109" tableDoi="10.3897/zookeys.899.47070.figure7">
7
<normalizedToken originalValue="IK">I-K</normalizedToken>
<normalizedToken id="9F54CD8AABD96ECC6C9C8F6317C9EE22" originalValue="IK">I-K</normalizedToken>
</figureCitation>
) that is barely detached from the pallial line compared with the longer and ventrally detached scar of
<taxonomicName class="Bivalvia" family="Lucinidae" genus="Rugalucina" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Rugalucina angela" order="Lucinida" pageId="0" pageNumber="109" phylum="Mollusca" rank="species" species="angela">
<emphasis italics="true" pageId="0" pageNumber="109">Rugalucina angela</emphasis>
<taxonomicName id="E93342F6C30A0C3C11F72DB8FE8D3AA6" class="Bivalvia" family="Lucinidae" genus="Rugalucina" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Rugalucina angela" order="Lucinida" pageId="0" pageNumber="109" phylum="Mollusca" rank="species" species="angela">
<emphasis id="A3B0AAB2A35611C414D2D629E49519E6" italics="true" pageId="0" pageNumber="109">Rugalucina angela</emphasis>
</taxonomicName>
,
<taxonomicName lsidName="R. vietnamica" pageId="0" pageNumber="109" rank="species" species="vietnamica">
<emphasis italics="true" pageId="0" pageNumber="109">R. vietnamica</emphasis>
<taxonomicName id="1BAEE6276EF2C3E07773BE536444D82E" lsidName="R. vietnamica" pageId="0" pageNumber="109" rank="species" species="vietnamica">
<emphasis id="7F5BA60089B967026F538BA461803FF1" italics="true" pageId="0" pageNumber="109">R. vietnamica</emphasis>
</taxonomicName>
and
<taxonomicName lsidName="R. munda" pageId="0" pageNumber="109" rank="species" species="munda">
<emphasis italics="true" pageId="0" pageNumber="109">R. munda</emphasis>
<taxonomicName id="A80526FF1A4CC86D3F24FC77A27823F0" lsidName="R. munda" pageId="0" pageNumber="109" rank="species" species="munda">
<emphasis id="76EAA502D235A88CAA2488B3B32173C8" italics="true" pageId="0" pageNumber="109">R. munda</emphasis>
</taxonomicName>
. It also has a distinctive sculpture of oblique commarginal lamellae set at an angle to the ventral shell margin that is not seen in other
<taxonomicName class="Bivalvia" family="Lucinidae" genus="Rugalucina" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Rugalucina" order="Lucinida" pageId="0" pageNumber="109" phylum="Mollusca" rank="genus">
<emphasis italics="true" pageId="0" pageNumber="109">Rugalucina</emphasis>
<taxonomicName id="7907527FAA29E42F956E556033E8C719" class="Bivalvia" family="Lucinidae" genus="Rugalucina" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Rugalucina" order="Lucinida" pageId="0" pageNumber="109" phylum="Mollusca" rank="genus">
<emphasis id="33E2BFA2B763A18A8DA8D87B7248CFCB" italics="true" pageId="0" pageNumber="109">Rugalucina</emphasis>
</taxonomicName>
. Similar radial ribs and dentate inner shell margin are present in
<taxonomicName class="Bivalvia" family="Lucinidae" genus="Pusillolucina" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Pusillolucina" order="Lucinida" pageId="0" pageNumber="109" phylum="Mollusca" rank="genus">
<emphasis italics="true" pageId="0" pageNumber="109">Pusillolucina</emphasis>
<taxonomicName id="94D84AE47DFEC1E5A85F06D3065BAA35" class="Bivalvia" family="Lucinidae" genus="Pusillolucina" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Pusillolucina" order="Lucinida" pageId="0" pageNumber="109" phylum="Mollusca" rank="genus">
<emphasis id="5DF611179E5670E1780328CB921930F1" italics="true" pageId="0" pageNumber="109">Pusillolucina</emphasis>
</taxonomicName>
species, but they have multi-cuspate posterior lateral teeth and lack the oblique commarginal sculpture.
</paragraph>
<paragraph pageId="0" pageNumber="109">
<paragraph id="6538605CCD336CE86E837E78113A2391" pageId="0" pageNumber="109">
The obliquely inset internal ligament indicates placement in the
<taxonomicName class="Bivalvia" family="Lucinidae" genus="Loripes" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Loripes" order="Lucinida" pageId="0" pageNumber="109" phylum="Mollusca" rank="genus">
<emphasis italics="true" pageId="0" pageNumber="109">Loripes</emphasis>
<taxonomicName id="6563638B07D44EB45B6D73072DF21AB5" class="Bivalvia" family="Lucinidae" genus="Loripes" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Loripes" order="Lucinida" pageId="0" pageNumber="109" phylum="Mollusca" rank="genus">
<emphasis id="0CE00A02803F213C43176CA8DCF27D35" italics="true" pageId="0" pageNumber="109">Loripes</emphasis>
</taxonomicName>
group of genera and while the external sculpture resembles
<taxonomicName class="Bivalvia" family="Lucinidae" genus="Rugalucina" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Rugalucina" order="Lucinida" pageId="0" pageNumber="109" phylum="Mollusca" rank="genus">
<emphasis italics="true" pageId="0" pageNumber="109">Rugalucina</emphasis>
<taxonomicName id="CD52440F51065E69130DF5CD1AE8D1C2" class="Bivalvia" family="Lucinidae" genus="Rugalucina" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Rugalucina" order="Lucinida" pageId="0" pageNumber="109" phylum="Mollusca" rank="genus">
<emphasis id="FA225478B8B7E337EE7EF122AB6F6965" italics="true" pageId="0" pageNumber="109">Rugalucina</emphasis>
</taxonomicName>
in radial ribbing the obliquely aligned commarginal lamellae are similar to that seen in
<taxonomicName class="Bivalvia" family="Lucinidae" genus="Lucinella" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Lucinella divaricata" order="Lucinida" pageId="0" pageNumber="109" phylum="Mollusca" rank="species" species="divaricata">
<emphasis italics="true" pageId="0" pageNumber="109">Lucinella divaricata</emphasis>
<taxonomicName id="FA48DD27A20B3608D66796C134032BCC" class="Bivalvia" family="Lucinidae" genus="Lucinella" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Lucinella divaricata" order="Lucinida" pageId="0" pageNumber="109" phylum="Mollusca" rank="species" species="divaricata">
<emphasis id="4143947E5AB0C63E74D3555327A507C9" italics="true" pageId="0" pageNumber="109">Lucinella divaricata</emphasis>
</taxonomicName>
(Linnaeus, 1758) from the eastern Atlantic but that species lacks any radial ribbing.
</paragraph>
<caption doi="10.3897/zookeys.899.47070.figure6" httpUri="https://binary.pensoft.net/fig/364613" pageId="0" pageNumber="109" start="Figure 6" startId="F6">
<paragraph pageId="0" pageNumber="109">
<emphasis bold="true" pageId="0" pageNumber="109">Figure 6.</emphasis>
<caption id="7DACB61CA68BEEED492A776075F612FA" doi="10.3897/zookeys.899.47070.figure6" httpUri="https://binary.pensoft.net/fig/364613" pageId="0" pageNumber="109" start="Figure 6" startId="F6">
<paragraph id="8D4DC83E1472A97014A8D1AB968D7B0E" pageId="0" pageNumber="109">
<emphasis id="CE31D187B6AB1B8FAAB2A94BC62658D4" bold="true" pageId="0" pageNumber="109">Figure 6.</emphasis>
'
<taxonomicName class="Bivalvia" family="Lucinidae" genus="Rugalucina" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Rugalucina" order="Lucinida" pageId="0" pageNumber="109" phylum="Mollusca" rank="genus">Rugalucina</taxonomicName>
<taxonomicName id="0D616CD5D9B245F49D040D6D28218411" class="Bivalvia" family="Lucinidae" genus="Rugalucina" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Rugalucina" order="Lucinida" pageId="0" pageNumber="109" phylum="Mollusca" rank="genus">Rugalucina</taxonomicName>
'
<taxonomicName lsidName="cypselis" pageId="0" pageNumber="109" rank="species" species="cypselis">cypselis</taxonomicName>
<taxonomicName id="D55CD8DA727AC219569BCF0AF6F465F5" lsidName="cypselis" pageId="0" pageNumber="109" rank="species" species="cypselis">cypselis</taxonomicName>
(Melvill, 1918).
<emphasis bold="true" pageId="0" pageNumber="109">
<normalizedToken originalValue="AD">A-D</normalizedToken>
<emphasis id="90E0E19AB88AB6DC8096F79224795170" bold="true" pageId="0" pageNumber="109">
<normalizedToken id="0E69D28FFE9123CC1F4B1B2380846B56" originalValue="AD">A-D</normalizedToken>
</emphasis>
Holotype
<taxonomicName class="Bivalvia" family="Lucinidae" genus="Divaricella" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Divaricella cypselis" order="Lucinida" pageId="0" pageNumber="109" phylum="Mollusca" rank="species" species="cypselis">
<emphasis italics="true" pageId="0" pageNumber="109">Divaricella cypselis</emphasis>
<taxonomicName id="05E3D7E09A7143507281B9032E6EDCA4" class="Bivalvia" family="Lucinidae" genus="Divaricella" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Divaricella cypselis" order="Lucinida" pageId="0" pageNumber="109" phylum="Mollusca" rank="species" species="cypselis">
<emphasis id="5BE8515FB3632E28719FDBB081F24F50" italics="true" pageId="0" pageNumber="109">Divaricella cypselis</emphasis>
</taxonomicName>
Melvill, 1918 (NHMUK 1921. 1. 28. 92), Karachi, L 5.2 mm
<emphasis bold="true" pageId="0" pageNumber="109">
<normalizedToken originalValue="EL">E-L</normalizedToken>
<emphasis id="FD63E804C7E83A328A37B927628EB6E0" bold="true" pageId="0" pageNumber="109">
<normalizedToken id="1E208F17385F4A661BFEF8DAB7C92AE7" originalValue="EL">E-L</normalizedToken>
</emphasis>
'
<taxonomicName class="Bivalvia" family="Lucinidae" genus="Rugalucina" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Rugalucina" order="Lucinida" pageId="0" pageNumber="109" phylum="Mollusca" rank="genus">Rugalucina</taxonomicName>
<taxonomicName id="BEB172C139E4FBD9389DA41051B4E2E1" class="Bivalvia" family="Lucinidae" genus="Rugalucina" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Rugalucina" order="Lucinida" pageId="0" pageNumber="109" phylum="Mollusca" rank="genus">Rugalucina</taxonomicName>
'
<taxonomicName lsidName="cypselis" pageId="0" pageNumber="109" rank="species" species="cypselis">cypselis</taxonomicName>
<taxonomicName id="BDA5FFF8B17FCA3DC7C7AFB3AD7F5A8D" lsidName="cypselis" pageId="0" pageNumber="109" rank="species" species="cypselis">cypselis</taxonomicName>
Karachi (NHMUK 20191075) Winckworth collection
<emphasis bold="true" pageId="0" pageNumber="109">E</emphasis>
<emphasis id="4E82E34E56956170FDB60FB5350FCC8B" bold="true" pageId="0" pageNumber="109">E</emphasis>
right valve, L 3.1 mm, ob - oblique commarginal lamellae
<emphasis bold="true" pageId="0" pageNumber="109">F</emphasis>
<emphasis id="D0BA06ED467F8626AD70AFDDB2778FA1" bold="true" pageId="0" pageNumber="109">F</emphasis>
left valve, L 3.0 mm
<emphasis bold="true" pageId="0" pageNumber="109">G</emphasis>
<emphasis id="96C0BCB9673E1C2B2279BC4AC646F54F" bold="true" pageId="0" pageNumber="109">G</emphasis>
right valve, L 3.2 mm
<emphasis bold="true" pageId="0" pageNumber="109">H</emphasis>
<emphasis id="816472CD5EDBB496BFAF01EB2616A52D" bold="true" pageId="0" pageNumber="109">H</emphasis>
dorsal view, L 1.9 mm
<emphasis bold="true" pageId="0" pageNumber="109">I</emphasis>
<emphasis id="14CE63B3890E2E38ADA6127BC1DC7A9A" bold="true" pageId="0" pageNumber="109">I</emphasis>
interior left valve, L 3.2 mm
<emphasis bold="true" pageId="0" pageNumber="109">J</emphasis>
<emphasis id="0E12A2044F5211F326152AC032CBA89A" bold="true" pageId="0" pageNumber="109">J</emphasis>
interior right valve, L 3.2 mm
<emphasis bold="true" pageId="0" pageNumber="109">K</emphasis>
<emphasis id="6775F98B5D1B3D85608322514439DDD6" bold="true" pageId="0" pageNumber="109">K</emphasis>
interior left valve, L 3.0 mm
<emphasis bold="true" pageId="0" pageNumber="109">L</emphasis>
<emphasis id="AC3AA57814250A4EE5A97C9B000FBB68" bold="true" pageId="0" pageNumber="109">L</emphasis>
protoconch
<emphasis bold="true" pageId="0" pageNumber="109">M</emphasis>
<emphasis id="F02D6D9A6A1F99AF765D292E81A2F12E" bold="true" pageId="0" pageNumber="109">M</emphasis>
detail of ventral margin (
<emphasis bold="true" pageId="0" pageNumber="109">F</emphasis>
<emphasis id="5A5456B4861EB4F7C20E7F98931B1AC3" bold="true" pageId="0" pageNumber="109">F</emphasis>
) showing obliquely aligned commarginal lamellae. Scale bar: 100
<normalizedToken originalValue="µm">µm</normalizedToken>
<normalizedToken id="AFEF42E8A4DA688323A5FA84F5C78F68" originalValue="µm">µm</normalizedToken>
(
<emphasis bold="true" pageId="0" pageNumber="109">L</emphasis>
<emphasis id="F567B45609A5BB1EE0198941C2B3086E" bold="true" pageId="0" pageNumber="109">L</emphasis>
); 1 mm (
<emphasis bold="true" pageId="0" pageNumber="109">M</emphasis>
<emphasis id="640414D5EE296AAFDE86BA1C2E70779A" bold="true" pageId="0" pageNumber="109">M</emphasis>
).
</paragraph>
</caption>