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<document id="3B87A4DD5986000465495C40027E4F73" ID-DOI="10.5852/ejt.2024.933.2525" ID-ISSN="2118-9773" ID-Zenodo-Dep="11198874" ID-ZooBank="8F720F2B-BFBC-4CA1-BFF2-A2B8C7C8D3E1" IM.bibliography_approvedBy="felipe" IM.illustrations_approvedBy="jonas" IM.materialsCitations_approvedBy="felipe" IM.metadata_approvedBy="jonas" IM.tables_approvedBy="jonas" IM.taxonomicNames_approvedBy="jonas" IM.treatments_approvedBy="jonas" checkinTime="1715771531038" checkinUser="plazi" docAuthor="Stöhr, Sabine" docDate="2024" docId="038987D9FFB6D74A005FC3251C76FD54" docLanguage="en" docName="EJT.2024.933.1-98.pdf" docOrigin="European Journal of Taxonomy 933" docSource="https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/2525/11335" docStyle="DocumentStyle:EF2B578F1D15862ADE45B0C07C620911.14:EJT.2018-.journal_article.type1" docStyleId="EF2B578F1D15862ADE45B0C07C620911" docStyleName="EJT.2018-.journal_article.type1" docStyleVersion="14" docTitle="Ophiacantha Muller &amp; Troschel 1842" docType="treatment" docVersion="1" lastPageNumber="39" masterDocId="FFB0FFA1FF92D76C0253C0121F07FFDA" masterDocTitle="Taxonomic analysis of the genital plates and associated structures in Ophiuroidea (Echinodermata)" masterLastPageNumber="98" masterPageNumber="1" pageNumber="37" updateTime="1715887483408" updateUser="jonas" zenodo-license-document="CC-BY-4.0" zenodo-license-figures="CC-BY-4.0" zenodo-license-treatments="UNSPECIFIED">
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<mods:title id="DDE15CD8A7AABEFE88CF140D5CBEFEE8">Taxonomic analysis of the genital plates and associated structures in Ophiuroidea (Echinodermata)</mods:title>
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<mods:namePart id="8DEF59DD847D5E6BCCB852506E4A7D6D">Stöhr, Sabine</mods:namePart>
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<mods:date id="D4B5669B89FCAB9F4D85F26DC4F3A678">2024</mods:date>
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<treatment id="038987D9FFB6D74A005FC3251C76FD54" ID-DOI="http://doi.org/10.5281/zenodo.11197616" ID-Zenodo-Dep="11197616" LSID="urn:lsid:plazi:treatment:038987D9FFB6D74A005FC3251C76FD54" httpUri="http://treatment.plazi.org/id/038987D9FFB6D74A005FC3251C76FD54" lastPageId="38" lastPageNumber="39" pageId="36" pageNumber="37">
<subSubSection id="C33A6544FFB6D748005FC3251B2FFC8B" box="[524,1064,822,849]" pageId="36" pageNumber="37" type="nomenclature">
<paragraph id="8B9F36CFFFB6D748005FC3251B2FFC8B" blockId="36.[524,1064,822,884]" box="[524,1064,822,849]" pageId="36" pageNumber="37">
<heading id="D0D781A3FFB6D748005FC3251B2FFC8B" box="[524,1064,822,849]" centered="true" fontSize="11" level="2" pageId="36" pageNumber="37" reason="2">
Genus
<taxonomicName id="4C204D4CFFB6D748000DC3241B2FFC8B" ID-CoL="7PNC4" authority="Muller &amp; Troschel, 1842" authorityName="Muller &amp; Troschel" authorityYear="1842" box="[606,1064,822,849]" class="Ophiuroidea" family="Ophiacanthidae" genus="Ophiacantha" kingdom="Animalia" order="Ophiacanthida" pageId="36" pageNumber="37" phylum="Echinodermata" rank="genus">
<emphasis id="B954EADDFFB6D748000DC3241DFBFC8B" bold="true" box="[606,764,822,849]" italics="true" pageId="36" pageNumber="37">Ophiacantha</emphasis>
Müller &amp; Troschel, 1842
</taxonomicName>
</heading>
</paragraph>
</subSubSection>
<subSubSection id="C33A6544FFB6D74800A3C3481C44FCAE" box="[752,835,858,884]" pageId="36" pageNumber="37" type="description">
<paragraph id="8B9F36CFFFB6D74800A3C3481C44FCAE" blockId="36.[524,1064,822,884]" box="[752,835,858,884]" pageId="36" pageNumber="37">
<figureCitation id="131B2A4AFFB6D74800A3C3481C44FCAE" box="[752,835,858,884]" captionStart="Fig" captionStartId="37.[189,232,1651,1677]" captionTargetBox="[189,1399,265,1603]" captionTargetId="figure-154@37.[189,1399,265,1603]" captionTargetPageId="37" captionText="Fig. 16. Ophiacanthidae Ljungman, 1867. SEM, unless otherwise noted. A–L. Ophiacantha bidentata (Bruzelius, 1805) (11.5 mm dd). A–B. Genital plates and radial shield in situ, micro-CT. C. adGP, abradial aspect. D. adGP, adradial aspect. E. abGP. F. Oral shield and oGP, in situ, bleached specimen, digital photo. G. Madreporite and oGP in situ, external aspect, micro-CT. H. Madreporite and oGP in situ, internal aspect, micro-CT. I. Radial shield, internal aspect. J. Madreporite, internal disto-lateral aspect. K. Oral shield and oGP (arrowheads), internal aspect.L. oGP, various aspects.M–O. O. bidentata (13 mm dd). M. adGP, adradial aspect. N. adGP, abradial aspect. O. abGP. P–T. O. abyssicola G.O. Sars, 1872. P. adGP, adradial aspect. Q. adGP, abradial aspect. R. abGP. S. Madreporite. T. Radial shield, internal aspect. Scale bars: 0.5 mm." figureDoi="http://doi.org/10.5281/zenodo.11198910" httpUri="https://zenodo.org/record/11198910/files/figure.png" pageId="36" pageNumber="37">Fig. 16</figureCitation>
</paragraph>
</subSubSection>
<subSubSection id="C33A6544FFB6D74802EEC38E1D5BFC3F" pageId="36" pageNumber="37" type="type_taxon">
<paragraph id="8B9F36CFFFB6D74802EEC38E1E5FFC6F" blockId="36.[189,344,923,950]" box="[189,344,923,950]" pageId="36" pageNumber="37">
<heading id="D0D781A3FFB6D74802EEC38E1E5FFC6F" bold="true" box="[189,344,923,950]" fontSize="11" level="3" pageId="36" pageNumber="37" reason="3">
<emphasis id="B954EADDFFB6D74802EEC38E1E5FFC6F" bold="true" box="[189,344,923,950]" pageId="36" pageNumber="37">
<typeStatus id="549B886DFFB6D74802EEC38E1FFDFC6C" box="[189,250,924,950]" pageId="36" pageNumber="37">Type</typeStatus>
species
</emphasis>
</heading>
</paragraph>
<paragraph id="8B9F36CFFFB6D74802EEC3D81D5BFC3F" blockId="36.[189,604,970,997]" box="[189,604,970,997]" pageId="36" pageNumber="37">
<taxonomicName id="4C204D4CFFB6D74802EEC3D81D5FFC3F" authority="Bruzelius, 1805" authorityName="Bruzelius" authorityYear="1805" box="[189,600,970,997]" class="Asteroidea" family="Asteriidae" genus="Asterias" kingdom="Animalia" order="Forcipulatida" pageId="36" pageNumber="37" phylum="Echinodermata" rank="species" species="bidentata">
<emphasis id="B954EADDFFB6D74802EEC3D81E94FC3E" box="[189,403,970,996]" italics="true" pageId="36" pageNumber="37">Asterias bidentata</emphasis>
Bruzelius, 1805
</taxonomicName>
.
</paragraph>
</subSubSection>
<subSubSection id="C33A6544FFB6D74802EEC4191C41FB8E" pageId="36" pageNumber="37" type="taxon_list">
<paragraph id="8B9F36CFFFB6D74802EEC4191E9EFBFF" blockId="36.[189,409,1035,1061]" box="[189,409,1035,1061]" pageId="36" pageNumber="37">
<heading id="D0D781A3FFB6D74802EEC4191E9EFBFF" bold="true" box="[189,409,1035,1061]" fontSize="11" level="3" pageId="36" pageNumber="37" reason="3">
<emphasis id="B954EADDFFB6D74802EEC4191E9EFBFF" bold="true" box="[189,409,1035,1061]" pageId="36" pageNumber="37">Examined species</emphasis>
</heading>
</paragraph>
<paragraph id="8B9F36CFFFB6D74802EEC4281C41FB8E" blockId="36.[189,838,1082,1109]" box="[189,838,1082,1109]" pageId="36" pageNumber="37">
<taxonomicName id="4C204D4CFFB6D74802EEC4281ECBFB8E" ID-CoL="6SMYY" baseAuthorityName="Bruzelius" baseAuthorityYear="1805" box="[189,460,1082,1108]" class="Ophiuroidea" family="Ophiacanthidae" genus="Ophiacantha" kingdom="Animalia" order="Ophiacanthida" pageId="36" pageNumber="37" phylum="Echinodermata" rank="species" species="bidentata">
<emphasis id="B954EADDFFB6D74802EEC4281ECBFB8E" box="[189,460,1082,1108]" italics="true" pageId="36" pageNumber="37">Ophiacantha bidentata</emphasis>
</taxonomicName>
,
<taxonomicName id="4C204D4CFFB6D7480388C4291C45FB8E" ID-CoL="49V7T" authority="G. O. Sars, 1872" authorityName="G. O. Sars" authorityYear="1872" box="[475,834,1082,1109]" class="Ophiuroidea" family="Ophiactidae" genus="Ophiactis" kingdom="Animalia" order="Amphilepidida" pageId="36" pageNumber="37" phylum="Echinodermata" rank="species" species="abyssicola">
<emphasis id="B954EADDFFB6D7480388C4291D7CFB8E" box="[475,635,1082,1109]" italics="true" pageId="36" pageNumber="37">O. abyssicola</emphasis>
G.O. Sars, 1872
</taxonomicName>
.
</paragraph>
</subSubSection>
<subSubSection id="C33A6544FFB6D74802EEC4691E92F81B" pageId="36" pageNumber="37" type="description">
<paragraph id="8B9F36CFFFB6D74802EEC4691E2FFB4F" blockId="36.[189,296,1147,1173]" box="[189,296,1147,1173]" pageId="36" pageNumber="37">
<heading id="D0D781A3FFB6D74802EEC4691E2FFB4F" bold="true" box="[189,296,1147,1173]" fontSize="11" level="3" pageId="36" pageNumber="37" reason="3">
<emphasis id="B954EADDFFB6D74802EEC4691E2FFB4F" bold="true" box="[189,296,1147,1173]" pageId="36" pageNumber="37">Oral GP</emphasis>
</heading>
</paragraph>
<paragraph id="8B9F36CFFFB6D74802EEC4B81B95FB3D" blockId="36.[188,1399,1194,1256]" pageId="36" pageNumber="37">Pair close together, overlapping ventral disc scales. Rounded triangular or rectangular with median fold. Attached to distal point of oral shield with thickened edge. Large pore in inner side.</paragraph>
<paragraph id="8B9F36CFFFB6D74802EEC51C1E59FAF2" blockId="36.[189,350,1294,1320]" box="[189,350,1294,1320]" pageId="36" pageNumber="37">
<heading id="D0D781A3FFB6D74802EEC51C1E59FAF2" bold="true" box="[189,350,1294,1320]" fontSize="11" level="3" pageId="36" pageNumber="37" reason="3">
<emphasis id="B954EADDFFB6D74802EEC51C1E59FAF2" bold="true" box="[189,350,1294,1320]" pageId="36" pageNumber="37">Adradial GP</emphasis>
</heading>
</paragraph>
<paragraph id="8B9F36CFFFB6D74802EEC52F1BF4FA44" blockId="36.[189,1400,1341,1438]" pageId="36" pageNumber="37">Bar-like, with slightly widened distal end, articular structures as single dorso-distal condyle, bordered by curved groove with low protruding ventral stereom edge. Abradially a process and patches of denser stereom, where abGP attaches. Dorsal part of condyle meets flat surface of underside of RS.</paragraph>
<paragraph id="8B9F36CFFFB6D74802EEC5D71E59FA05" blockId="36.[189,350,1477,1503]" box="[189,350,1477,1503]" pageId="36" pageNumber="37">
<heading id="D0D781A3FFB6D74802EEC5D71E59FA05" bold="true" box="[189,350,1477,1503]" fontSize="11" level="3" pageId="36" pageNumber="37" reason="3">
<emphasis id="B954EADDFFB6D74802EEC5D71E59FA05" bold="true" box="[189,350,1477,1503]" pageId="36" pageNumber="37">Abradial GP</emphasis>
</heading>
</paragraph>
<paragraph id="8B9F36CFFFB6D74802EEC5E61DC4F98F" blockId="36.[189,1399,1524,1621]" pageId="36" pageNumber="37">Thin, flat, curved scale, abradial edge strongly convex, adradial edge concave, with tapered, rounded proximal end, wider, slanting straight distal edge with flat or slightly domed articular surface. Adradial surface in distal part with conspicuous pore.</paragraph>
<paragraph id="8B9F36CFFFB6D74802EEC6691E53F94F" blockId="36.[189,340,1659,1685]" box="[189,340,1659,1685]" pageId="36" pageNumber="37">
<heading id="D0D781A3FFB6D74802EEC6691E53F94F" bold="true" box="[189,340,1659,1685]" fontSize="11" level="3" pageId="36" pageNumber="37" reason="3">
<emphasis id="B954EADDFFB6D74802EEC6691E53F94F" bold="true" box="[189,340,1659,1685]" pageId="36" pageNumber="37">Oral shields</emphasis>
</heading>
</paragraph>
<paragraph id="8B9F36CFFFB6D74802EEC6B81D74F8F4" blockId="36.[189,1400,1706,1838]" pageId="36" pageNumber="37">Hexagonal, wing-like, twice as wide as long, inner surface domed in centre, distal third of inner side thickened. Madreporite larger, wing-like with rounded lateral edges, strongly convex distal lobe, inner side flat on ‘wings’, thickened in centre and on lobe, which has a large hole, opening into a smaller hole (hydropore) in one latero-distal edge.</paragraph>
<paragraph id="8B9F36CFFFB6D74802EEC7471E67F8B5" blockId="36.[189,352,1877,1903]" box="[189,352,1877,1903]" pageId="36" pageNumber="37">
<heading id="D0D781A3FFB6D74802EEC7471E67F8B5" bold="true" box="[189,352,1877,1903]" fontSize="11" level="3" pageId="36" pageNumber="37" reason="3">
<emphasis id="B954EADDFFB6D74802EEC7471E67F8B5" bold="true" box="[189,352,1877,1903]" pageId="36" pageNumber="37">Radial shield</emphasis>
</heading>
</paragraph>
<paragraph id="8B9F36CFFFB6D74802EEC7961E92F81B" blockId="36.[189,1399,1923,1985]" pageId="36" pageNumber="37">Narrow bar-like, distal end fan-shaped widened, small pore in distal part, straight distal edge, no specific articular structure.</paragraph>
</subSubSection>
<caption id="DF5F6647FFB7D74902EEC6611D66F872" ID-DOI="http://doi.org/10.5281/zenodo.11198910" ID-Zenodo-Dep="11198910" httpUri="https://zenodo.org/record/11198910/files/figure.png" pageId="37" pageNumber="38" startId="37.[189,232,1651,1677]" targetBox="[189,1399,265,1603]" targetPageId="37">
<paragraph id="8B9F36CFFFB7D74902EEC6611D66F872" blockId="37.[188,1399,1651,1960]" pageId="37" pageNumber="38">
<emphasis id="B954EADDFFB7D74902EEC6611E1DF954" bold="true" box="[189,282,1651,1678]" pageId="37" pageNumber="38">Fig. 16.</emphasis>
<taxonomicName id="4C204D4CFFB7D7490370C6661DAEF954" authority="Ljungman, 1867" authorityName="Ljungman" authorityYear="1867" box="[291,681,1652,1678]" class="Ophiuroidea" family="Ophiacanthidae" kingdom="Animalia" order="Ophiacanthida" pageId="37" pageNumber="38" phylum="Echinodermata" rank="family">Ophiacanthidae Ljungman, 1867</taxonomicName>
. SEM, unless otherwise noted.
<emphasis id="B954EADDFFB7D7490673C6611B50F957" bold="true" box="[1056,1111,1651,1677]" pageId="37" pageNumber="38">A–L</emphasis>
.
<taxonomicName id="4C204D4CFFB7D7490635C6661E89F968" authority="(Bruzelius, 1805)" baseAuthorityName="Bruzelius" baseAuthorityYear="1805" class="Ophiuroidea" family="Ophiacanthidae" genus="Ophiacantha" kingdom="Animalia" order="Ophiacanthida" pageId="37" pageNumber="38" phylum="Echinodermata" rank="species" species="bidentata">
<emphasis id="B954EADDFFB7D7490635C6661A70F954" box="[1126,1399,1652,1678]" italics="true" pageId="37" pageNumber="38">Ophiacantha bidentata</emphasis>
(Bruzelius, 1805)
</taxonomicName>
(11.5 mm dd).
<emphasis id="B954EADDFFB7D7490007C6851D8BF96B" bold="true" box="[596,652,1687,1713]" pageId="37" pageNumber="38">A–B</emphasis>
. Genital plates and radial shield in situ, micro-CT.
<emphasis id="B954EADDFFB7D749075AC6851A19F96B" bold="true" box="[1289,1310,1687,1713]" pageId="37" pageNumber="38">C</emphasis>
. adGP, abradial aspect.
<emphasis id="B954EADDFFB7D749032FC6A81E96F90E" bold="true" box="[380,401,1722,1748]" pageId="37" pageNumber="38">D</emphasis>
. adGP, adradial aspect.
<emphasis id="B954EADDFFB7D74900FFC6A81DB8F90E" bold="true" box="[684,703,1722,1748]" pageId="37" pageNumber="38">E</emphasis>
. abGP.
<emphasis id="B954EADDFFB7D749014FC6A81C2AF90E" bold="true" box="[796,813,1722,1748]" pageId="37" pageNumber="38">F</emphasis>
. Oral shield and oGP, in situ, bleached specimen, digital photo.
<emphasis id="B954EADDFFB7D7490336C6CF1E7DF92D" bold="true" box="[357,378,1757,1783]" pageId="37" pageNumber="38">G</emphasis>
. Madreporite and oGP in situ, external aspect, micro-CT.
<emphasis id="B954EADDFFB7D7490662C6CF1B41F92D" bold="true" box="[1073,1094,1757,1783]" pageId="37" pageNumber="38">H</emphasis>
. Madreporite and oGP in situ, internal aspect, micro-CT.
<emphasis id="B954EADDFFB7D7490069C7131D42F8C1" bold="true" box="[570,581,1793,1819]" pageId="37" pageNumber="38">I</emphasis>
. Radial shield, internal aspect.
<emphasis id="B954EADDFFB7D7490197C7131CD4F8C1" bold="true" box="[964,979,1793,1819]" pageId="37" pageNumber="38">J</emphasis>
. Madreporite, internal disto-lateral aspect.
<emphasis id="B954EADDFFB7D7490340C7361E2DF8E4" bold="true" box="[275,298,1828,1854]" pageId="37" pageNumber="38">K</emphasis>
. Oral shield and oGP (arrowheads), internal aspect.
<emphasis id="B954EADDFFB7D749012FC7361C97F8E4" bold="true" box="[892,912,1828,1854]" pageId="37" pageNumber="38">L</emphasis>
. oGP, various aspects.
<emphasis id="B954EADDFFB7D74906C5C7311BD0F8E7" bold="true" box="[1174,1239,1827,1853]" pageId="37" pageNumber="38">M–O</emphasis>
.
<taxonomicName id="4C204D4CFFB7D74906B5C7361A70F8E4" baseAuthorityName="Bruzelius" baseAuthorityYear="1805" box="[1254,1399,1828,1854]" class="Ophiuroidea" family="Ophiacanthidae" genus="Ophiacantha" kingdom="Animalia" order="Ophiacanthida" pageId="37" pageNumber="38" phylum="Echinodermata" rank="species" species="bidentata">
<emphasis id="B954EADDFFB7D74906B5C7361BFCF8E4" box="[1254,1275,1828,1854]" italics="true" pageId="37" pageNumber="38">O</emphasis>
.
<emphasis id="B954EADDFFB7D749075BC7361A70F8E4" box="[1288,1399,1828,1854]" italics="true" pageId="37" pageNumber="38">bidentata</emphasis>
</taxonomicName>
(13 mm dd).
<emphasis id="B954EADDFFB7D7490303C7551E6BF8BB" bold="true" box="[336,364,1863,1889]" pageId="37" pageNumber="38">M</emphasis>
. adGP, adradial aspect.
<emphasis id="B954EADDFFB7D749002CC7551D93F8BB" bold="true" box="[639,660,1863,1889]" pageId="37" pageNumber="38">N</emphasis>
. adGP, abradial aspect.
<emphasis id="B954EADDFFB7D74901FBC7551CB8F8BB" bold="true" box="[936,959,1863,1889]" pageId="37" pageNumber="38">O</emphasis>
. abGP.
<emphasis id="B954EADDFFB7D7490644C7551B4CF8BB" bold="true" box="[1047,1099,1863,1889]" pageId="37" pageNumber="38">P–T</emphasis>
.
<taxonomicName id="4C204D4CFFB7D7490609C7551FFDF85E" authority="G. O. Sars, 1872" authorityName="G. O. Sars" authorityYear="1872" class="Ophiuroidea" family="Ophiactidae" genus="Ophiactis" kingdom="Animalia" order="Amphilepidida" pageId="37" pageNumber="38" phylum="Echinodermata" rank="species" species="abyssicola">
<emphasis id="B954EADDFFB7D7490609C7551B68F8BB" box="[1114,1135,1863,1889]" italics="true" pageId="37" pageNumber="38">O</emphasis>
.
<emphasis id="B954EADDFFB7D749062FC7551BFFF8BB" box="[1148,1272,1863,1889]" italics="true" pageId="37" pageNumber="38">abyssicola</emphasis>
G.O. Sars, 1872
</taxonomicName>
.
<emphasis id="B954EADDFFB7D749035AC7781E1CF85E" bold="true" box="[265,283,1898,1924]" pageId="37" pageNumber="38">P</emphasis>
. adGP, adradial aspect.
<emphasis id="B954EADDFFB7D749006CC7781D54F85E" bold="true" box="[575,595,1898,1924]" pageId="37" pageNumber="38">Q</emphasis>
. adGP, abradial aspect.
<emphasis id="B954EADDFFB7D749012BC7781C8CF85E" bold="true" box="[888,907,1898,1924]" pageId="37" pageNumber="38">R</emphasis>
. abGP.
<emphasis id="B954EADDFFB7D74901BEC7781CFCF85E" bold="true" box="[1005,1019,1898,1924]" pageId="37" pageNumber="38">S</emphasis>
. Madreporite.
<emphasis id="B954EADDFFB7D74906E2C7781BC5F85E" bold="true" box="[1201,1218,1898,1924]" pageId="37" pageNumber="38">T</emphasis>
. Radial shield, internal aspect. Scale bars: 0.5 mm.
</paragraph>
</caption>
<subSubSection id="C33A6544FFB4D74A02EEC11B1C76FD54" pageId="38" pageNumber="39" type="discussion">
<paragraph id="8B9F36CFFFB4D74A02EEC11B1E28FEF9" blockId="38.[189,303,265,291]" box="[189,303,265,291]" pageId="38" pageNumber="39">
<heading id="D0D781A3FFB4D74A02EEC11B1E28FEF9" bold="true" box="[189,303,265,291]" fontSize="11" level="3" pageId="38" pageNumber="39" reason="3">
<emphasis id="B954EADDFFB4D74A02EEC11B1E28FEF9" bold="true" box="[189,303,265,291]" pageId="38" pageNumber="39">Remarks</emphasis>
</heading>
</paragraph>
<paragraph id="8B9F36CFFFB4D74A02EEC12A1C76FD54" blockId="38.[187,1400,311,654]" pageId="38" pageNumber="39">
<specimenCount id="9D26FD46FFB4D74A02EEC12A1E77FE8B" box="[189,368,311,338]" count="2" pageId="38" pageNumber="39" type="generic">Two specimens</specimenCount>
of
<taxonomicName id="4C204D4CFFB4D74A03C3C1251D24FE8B" baseAuthorityName="Bruzelius" baseAuthorityYear="1805" box="[400,547,311,338]" class="Ophiuroidea" family="Ophiacanthidae" genus="Ophiacantha" kingdom="Animalia" order="Ophiacanthida" pageId="38" pageNumber="39" phylum="Echinodermata" rank="species" species="bidentata">
<emphasis id="B954EADDFFB4D74A03C3C1251EA2FE8B" box="[400,421,311,337]" italics="true" pageId="38" pageNumber="39">O</emphasis>
.
<emphasis id="B954EADDFFB4D74A03E7C1251D24FE8B" box="[436,547,311,337]" italics="true" pageId="38" pageNumber="39">bidentata</emphasis>
</taxonomicName>
from
<collectingCountry id="F337765FFFB4D74A0035C1251DC9FE8B" box="[614,718,311,337]" name="Svalbard and Jan Mayen" pageId="38" pageNumber="39">Svalbard</collectingCountry>
were analysed; the smaller one (
<quantity id="4CD89B2AFFB4D74A0612C1251BA0FE88" box="[1089,1191,311,338]" metricMagnitude="-2" metricUnit="m" metricValue="1.15" pageId="38" pageNumber="39" unit="mm" value="11.5">11.5 mm</quantity>
dd) was dissected for this project and had narrower abGPs, a shorter but wider madreporite and slightly different adGPs (
<figureCitation id="131B2A4AFFB4D74A0294C16F1E55FE4D" box="[199,338,381,407]" captionStart="Fig" captionStartId="37.[189,232,1651,1677]" captionTargetBox="[189,1399,265,1603]" captionTargetId="figure-154@37.[189,1399,265,1603]" captionTargetPageId="37" captionText="Fig. 16. Ophiacanthidae Ljungman, 1867. SEM, unless otherwise noted. A–L. Ophiacantha bidentata (Bruzelius, 1805) (11.5 mm dd). A–B. Genital plates and radial shield in situ, micro-CT. C. adGP, abradial aspect. D. adGP, adradial aspect. E. abGP. F. Oral shield and oGP, in situ, bleached specimen, digital photo. G. Madreporite and oGP in situ, external aspect, micro-CT. H. Madreporite and oGP in situ, internal aspect, micro-CT. I. Radial shield, internal aspect. J. Madreporite, internal disto-lateral aspect. K. Oral shield and oGP (arrowheads), internal aspect.L. oGP, various aspects.M–O. O. bidentata (13 mm dd). M. adGP, adradial aspect. N. adGP, abradial aspect. O. abGP. P–T. O. abyssicola G.O. Sars, 1872. P. adGP, adradial aspect. Q. adGP, abradial aspect. R. abGP. S. Madreporite. T. Radial shield, internal aspect. Scale bars: 0.5 mm." figureDoi="http://doi.org/10.5281/zenodo.11198910" httpUri="https://zenodo.org/record/11198910/files/figure.png" pageId="38" pageNumber="39">Fig. 16A–L</figureCitation>
) than the larger one (
<quantity id="4CD89B2AFFB4D74A0014C16C1D9EFE42" box="[583,665,382,408]" metricMagnitude="-2" metricUnit="m" metricValue="1.3" pageId="38" pageNumber="39" unit="mm" value="13.0">13 mm</quantity>
dd,
<figureCitation id="131B2A4AFFB4D74A0099C16F1C58FE4D" box="[714,863,381,407]" captionStart="Fig" captionStartId="37.[189,232,1651,1677]" captionTargetBox="[189,1399,265,1603]" captionTargetId="figure-154@37.[189,1399,265,1603]" captionTargetPageId="37" captionText="Fig. 16. Ophiacanthidae Ljungman, 1867. SEM, unless otherwise noted. A–L. Ophiacantha bidentata (Bruzelius, 1805) (11.5 mm dd). A–B. Genital plates and radial shield in situ, micro-CT. C. adGP, abradial aspect. D. adGP, adradial aspect. E. abGP. F. Oral shield and oGP, in situ, bleached specimen, digital photo. G. Madreporite and oGP in situ, external aspect, micro-CT. H. Madreporite and oGP in situ, internal aspect, micro-CT. I. Radial shield, internal aspect. J. Madreporite, internal disto-lateral aspect. K. Oral shield and oGP (arrowheads), internal aspect.L. oGP, various aspects.M–O. O. bidentata (13 mm dd). M. adGP, adradial aspect. N. adGP, abradial aspect. O. abGP. P–T. O. abyssicola G.O. Sars, 1872. P. adGP, adradial aspect. Q. adGP, abradial aspect. R. abGP. S. Madreporite. T. Radial shield, internal aspect. Scale bars: 0.5 mm." figureDoi="http://doi.org/10.5281/zenodo.11198910" httpUri="https://zenodo.org/record/11198910/files/figure.png" pageId="38" pageNumber="39">Fig. 16M–O</figureCitation>
), of which images existed prior to this project. It is unclear whether these differences are due to the small size difference or whether this is variation between individuals in this morphologically variable species (evidenced by the fact that it has been synonymized with five other nominal species (
<bibRefCitation id="EFB14B3EFFB4D74A0087C1F51C9EFDDB" author="Stohr S. &amp; O'Hara T. D. &amp; Thuy B." box="[724,921,487,513]" pageId="38" pageNumber="39" refId="ref34222" refString="Stohr S., O'Hara T. D. &amp; Thuy B. 2022. World Ophiuroidea Database. World Ophiuroidea Database. https: // doi. org / 10.14284 / 358" type="book" year="2022">
Stöhr
<emphasis id="B954EADDFFB4D74A0148C1FA1C53FDDB" box="[795,852,487,513]" italics="true" pageId="38" pageNumber="39">et al.</emphasis>
2022
</bibRefCitation>
)). Since there is no geographic difference between these
<specimenCount id="9D26FD46FFB4D74A0335C2191D12FDFE" box="[358,533,522,549]" count="2" pageId="38" pageNumber="39" type="generic">two specimens</specimenCount>
, it seems unlikely that these differences indicate different species. There is also some variation within the genus
<taxonomicName id="4C204D4CFFB4D74A0023C23F1C0EFD9D" authorityName="Muller &amp; Troschel" authorityYear="1842" box="[624,777,557,583]" class="Ophiuroidea" family="Ophiacanthidae" genus="Ophiacantha" kingdom="Animalia" order="Ophiacanthida" pageId="38" pageNumber="39" phylum="Echinodermata" rank="genus">
<emphasis id="B954EADDFFB4D74A0023C23F1C0EFD9D" box="[624,777,557,583]" italics="true" pageId="38" pageNumber="39">Ophiacantha</emphasis>
</taxonomicName>
. A specimen of
<taxonomicName id="4C204D4CFFB4D74A0194C23C1B60FD9D" authorityName="G. O. Sars" authorityYear="1872" box="[967,1127,557,584]" class="Ophiuroidea" family="Ophiactidae" genus="Ophiactis" kingdom="Animalia" order="Amphilepidida" pageId="38" pageNumber="39" phylum="Echinodermata" rank="species" species="abyssicola">
<emphasis id="B954EADDFFB4D74A0194C23C1CDBFD92" box="[967,988,558,584]" italics="true" pageId="38" pageNumber="39">O</emphasis>
.
<emphasis id="B954EADDFFB4D74A01B8C23F1B60FD9D" box="[1003,1127,557,583]" italics="true" pageId="38" pageNumber="39">abyssicola</emphasis>
</taxonomicName>
of similar size (
<quantity id="4CD89B2AFFB4D74A0777C23C1A70FD92" box="[1316,1399,558,584]" metricMagnitude="-2" metricUnit="m" metricValue="1.3" pageId="38" pageNumber="39" unit="mm" value="13.0">13 mm</quantity>
dd) had narrower adGPs, smaller, less curved, more tapered abGPs, RSs with a triangular distal end with embossed part, and a madreporite with a large central hole.
</paragraph>
</subSubSection>
</treatment>
</document>
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