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<document id="981A9826CDCA534C342455DE6F59F165" ID-DOI="10.5852/ejt.2023.898.2295" ID-ISSN="2118-9773" ID-Zenodo-Dep="8413500" ID-ZooBank="87EE2C76-1DDC-40DE-87E7-4D0E11A312DC" IM.bibliography_approvedBy="felipe" IM.illustrations_approvedBy="valdenar" IM.materialsCitations_approvedBy="felipe" IM.metadata_approvedBy="felipe" IM.tables_approvedBy="valdenar" IM.taxonomicNames_approvedBy="felipe" IM.treatmentCitations_approvedBy="valdenar" IM.treatments_approvedBy="valdenar" checkinTime="1696583317071" checkinUser="plazi" docAuthor="Laville, Thomas, Forel, Marie-Béatrice &amp; Charbonnier, Sylvain" docDate="2023" docId="C12F87D2996AFFCF2D3EFC11FA6CF795" docLanguage="en" docName="EJT.2023.898.1-61.pdf" docOrigin="European Journal of Taxonomy 898 (1)" docSource="https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/2295/9941" docStyle="DocumentStyle:EF2B578F1D15862ADE45B0C07C620911.14:EJT.2018-.journal_article.type1" docStyleId="EF2B578F1D15862ADE45B0C07C620911" docStyleName="EJT.2018-.journal_article.type1" docStyleVersion="14" docTitle="Paraclausocaris Laville &amp; Forel &amp; Charbonnier 2023, gen. nov." docType="treatment" docUuid="BE0312F9-B192-4581-A2CB-3CC408857206" docUuidSource="ZooBank" docVersion="7" lastPageNumber="29" masterDocId="3D16FFAA9976FFD22F68FFCCF90DF61A" masterDocTitle="Re-appraisal of thylacocephalans (Euarthropoda, Thylacocephala) from the Jurassic La Voulte-sur-Rhône Lagerstätte" masterLastPageNumber="61" masterPageNumber="1" pageNumber="29" updateTime="1699694200096" updateUser="plazi" 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="D1E42C32FF823AA5A25FF0A39C3E68B0">Re-appraisal of thylacocephalans (Euarthropoda, Thylacocephala) from the Jurassic La Voulte-sur-Rhône Lagerstätte</mods:title>
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<mods:namePart id="7BF4F112F6BA43839C1702654923C4DC">Laville, Thomas</mods:namePart>
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<mods:affiliation id="C11919CC9B20BC595320094D13FB86F9">Muséum national dHistoire naturelle, Centre de Recherche en Paléontologie - Paris (CR 2 P, UMR 7207), Sorbonne Université-MNHN-CNRS, 57 rue Cuvier, 75005 Paris, France. &amp; Biogéosciences, UMR 6282 CNRS, Université de Bourgogne, 6 boulevard Gabriel, 2100 Dijon, France.</mods:affiliation>
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<mods:namePart id="9B1E4F278C79C8DC98BEC744975BE7BB">Forel, Marie-Béatrice</mods:namePart>
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<mods:affiliation id="3AF252CB11A050C51F8EE9A04B3D7638">Muséum national dHistoire naturelle, Centre de Recherche en Paléontologie - Paris (CR 2 P, UMR 7207), Sorbonne Université-MNHN-CNRS, 57 rue Cuvier, 75005 Paris, France.</mods:affiliation>
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<mods:namePart id="F399DC642994FED7C605E07F7912CDFA">Charbonnier, Sylvain</mods:namePart>
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<mods:affiliation id="62ACA22A4565B6D74D89BC66EF5E99A1">Muséum national dHistoire naturelle, Centre de Recherche en Paléontologie - Paris (CR 2 P, UMR 7207), Sorbonne Université-MNHN-CNRS, 57 rue Cuvier, 75005 Paris, France.</mods:affiliation>
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<mods:date id="21EAA5324E94898D1D9E183B43376D3F">2023</mods:date>
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<heading id="127181A8996AFFCE2D3EFC11FAD3F5E2" box="[598,990,989,1016]" centered="true" fontSize="11" level="2" pageId="28" pageNumber="29" reason="2">
Genus
<taxonomicName id="8E864D47996AFFCE2DC0FC11FA61F5E2" authority="Laville &amp; Forel &amp; Charbonnier, 2023" authorityName="Laville &amp; Forel &amp; Charbonnier" authorityYear="2023" box="[680,876,989,1016]" family="Ostenocarididae" genus="Paraclausocaris" higherTaxonomySource="GBIF" kingdom="Animalia" pageId="28" pageNumber="29" phylum="Arthropoda" rank="genus" status="gen. nov.">
<emphasis id="7BF2EAD6996AFFCE2DC0FC11FA61F5E2" bold="true" box="[680,876,989,1016]" italics="true" pageId="28" pageNumber="29">Paraclausocaris</emphasis>
</taxonomicName>
<taxonomicNameLabel id="60C157AD996AFFCE2C1BFC12FAD3F5E2" box="[883,990,990,1016]" pageId="28" pageNumber="29" rank="genus">gen. nov.</taxonomicNameLabel>
</heading>
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<heading id="127181A8996AFFCE2FD5FB8EF855F246" bold="true" box="[189,344,1090,1116]" fontSize="11" level="3" pageId="28" pageNumber="29" reason="3">
<emphasis id="7BF2EAD6996AFFCE2FD5FB8EF855F246" bold="true" box="[189,344,1090,1116]" pageId="28" pageNumber="29">
<typeStatus id="963D8866996AFFCE2FD5FB8EF9F7F246" box="[189,250,1090,1116]" pageId="28" pageNumber="29">Type</typeStatus>
species
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<taxonomicName id="8E864D47996AFFCE2FD5FBBCF8C1F290" authority="Laville &amp; Forel &amp; Charbonnier, 2023" authorityName="Laville &amp; Forel &amp; Charbonnier" authorityYear="2023" box="[189,460,1136,1162]" family="Ostenocarididae" genus="Paraclausocaris" higherTaxonomySource="GBIF" kingdom="Animalia" pageId="28" pageNumber="29" phylum="Arthropoda" rank="species" species="harpa" status="gen. et sp. nov.">
<emphasis id="7BF2EAD6996AFFCE2FD5FBBCF8C1F290" box="[189,460,1136,1162]" italics="true" pageId="28" pageNumber="29">Paraclausocaris harpa</emphasis>
</taxonomicName>
<taxonomicNameLabel id="60C157AD996AFFCE2EBCFBBDFB8FF291" box="[468,642,1137,1163]" pageId="28" pageNumber="29" rank="species">gen. et sp. nov.</taxonomicNameLabel>
by monotypy.
</paragraph>
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<subSubSection id="019C654F996AFFCE2FD5FB7EFB40F35B" pageId="28" pageNumber="29" type="diagnosis">
<paragraph id="493936C4996AFFCE2FD5FB7EF83BF2D6" blockId="28.[189,310,1202,1228]" box="[189,310,1202,1228]" pageId="28" pageNumber="29">
<heading id="127181A8996AFFCE2FD5FB7EF83BF2D6" bold="true" box="[189,310,1202,1228]" fontSize="11" level="3" pageId="28" pageNumber="29" reason="3">
<emphasis id="7BF2EAD6996AFFCE2FD5FB7EF83BF2D6" bold="true" box="[189,310,1202,1228]" pageId="28" pageNumber="29">Diagnosis</emphasis>
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<taxonomicName id="8E864D47996AFFCE2FD5FB2CF87AF2E0" authorityName="Pinna, Arduini, Pesarini &amp; Teruzzi" authorityYear="1982" box="[189,375,1248,1274]" class="Thylacocephala" infraClass="Thylacocephala" kingdom="Animalia" pageId="28" pageNumber="59" rank="infraClass">Thylacocephala</taxonomicName>
with a well-developed optic notch restricted to the ventral margin, a sharp antero-ventral angle, small sinuous ridges on the shield and raptorial appendages 3 having spines on the second and third podomeres of the distal part.
</paragraph>
</subSubSection>
<subSubSection id="019C654F996AFFCE2FD5FAA4FAD8F3AB" box="[189,981,1384,1457]" pageId="28" pageNumber="29" type="etymology">
<paragraph id="493936C4996AFFCE2FD5FAA4F849F398" blockId="28.[189,324,1384,1410]" box="[189,324,1384,1410]" pageId="28" pageNumber="29">
<heading id="127181A8996AFFCE2FD5FAA4F849F398" bold="true" box="[189,324,1384,1410]" fontSize="11" level="3" pageId="28" pageNumber="29" reason="3">
<emphasis id="7BF2EAD6996AFFCE2FD5FAA4F849F398" bold="true" box="[189,324,1384,1410]" pageId="28" pageNumber="29">Etymology</emphasis>
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<paragraph id="493936C4996AFFCE2FD5FA5BFAD8F3AB" blockId="28.[189,981,1431,1457]" box="[189,981,1431,1457]" pageId="28" pageNumber="29">
From the Latin
<emphasis id="7BF2EAD6996AFFCE2E16FA54F8AAF3AB" box="[382,423,1432,1457]" italics="true" pageId="28" pageNumber="29">par</emphasis>
,
<emphasis id="7BF2EAD6996AFFCE2EDDFA54F8FCF3AB" box="[437,497,1432,1457]" italics="true" pageId="28" pageNumber="29">paris</emphasis>
(close to) and
<taxonomicName id="8E864D47996AFFCE2DD3FA5BFADCF3AB" authority="Polz, 1989" authorityName="Polz" authorityYear="1989" box="[699,977,1431,1457]" genus="Clausocaris" higherTaxonomySource="GBIF" kingdom="Animalia" pageId="28" pageNumber="29" phylum="Arthropoda" rank="genus">
<emphasis id="7BF2EAD6996AFFCE2DD3FA5BFA44F3AB" box="[699,841,1431,1457]" italics="true" pageId="28" pageNumber="29">Clausocaris</emphasis>
<bibRefCitation id="2D174B35996AFFCE2C38FA5BFADCF3AB" author="Polz H." box="[848,977,1431,1457]" pageId="28" pageNumber="29" pagination="73" refId="ref28233" refString="Polz H. 1989. Clausocaris nom. nov. pro Clausia Oppenheim 1888. Archaeopteryx 7: 73." type="journal article" year="1989">Polz, 1989</bibRefCitation>
</taxonomicName>
.
</paragraph>
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<subSubSection id="019C654F996AFFCF2FD5FA14FA6CF795" lastPageId="29" lastPageNumber="30" pageId="28" pageNumber="29" type="discussion">
<paragraph id="493936C4996AFFCE2FD5FA14F822F3E8" blockId="28.[189,303,1496,1522]" box="[189,303,1496,1522]" pageId="28" pageNumber="29">
<heading id="127181A8996AFFCE2FD5FA14F822F3E8" bold="true" box="[189,303,1496,1522]" fontSize="11" level="3" pageId="28" pageNumber="29" reason="3">
<emphasis id="7BF2EAD6996AFFCE2FD5FA14F822F3E8" bold="true" box="[189,303,1496,1522]" pageId="28" pageNumber="29">Remarks</emphasis>
</heading>
</paragraph>
<paragraph id="493936C4996AFFCE2FD5F9CBFBE9F0CB" blockId="28.[189,1399,1543,1745]" pageId="28" pageNumber="29">
<taxonomicName id="8E864D47996AFFCE2FD5F9CBF872F03B" authority="Laville &amp; Forel &amp; Charbonnier, 2023" authorityName="Laville &amp; Forel &amp; Charbonnier" authorityYear="2023" box="[189,383,1543,1569]" family="Ostenocarididae" genus="Paraclausocaris" higherTaxonomySource="GBIF" kingdom="Animalia" pageId="28" pageNumber="29" phylum="Arthropoda" rank="genus" status="gen. nov.">
<emphasis id="7BF2EAD6996AFFCE2FD5F9CBF872F03B" box="[189,383,1543,1569]" italics="true" pageId="28" pageNumber="29">Paraclausocaris</emphasis>
</taxonomicName>
<taxonomicNameLabel id="60C157AD996AFFCE2EE4F9CBF8F1F03B" box="[396,508,1543,1569]" pageId="28" pageNumber="29" rank="genus">gen. nov.</taxonomicNameLabel>
has many similarities with
<taxonomicName id="8E864D47996AFFCE2C33F9CBFAE4F03B" authorityName="Polz" authorityYear="1989" box="[859,1001,1543,1569]" genus="Clausocaris" higherTaxonomySource="GBIF" kingdom="Animalia" pageId="28" pageNumber="29" phylum="Arthropoda" rank="genus">
<emphasis id="7BF2EAD6996AFFCE2C33F9CBFAE4F03B" box="[859,1001,1543,1569]" italics="true" pageId="28" pageNumber="29">Clausocaris</emphasis>
</taxonomicName>
: a cone-shaped shield in lateral view, a dorsal midline with sharp, short serrations and long, thin raptorial appendages relative to the shield. However, it also displays some differences, including a well-developed posterior margin and an anterior margin with an optic notch limited to the ventral part of the margin for
<taxonomicName id="8E864D47996AFFCE2B0DF9BCFC2AF090" authorityName="Laville &amp; Forel &amp; Charbonnier" authorityYear="2023" box="[1125,1319,1648,1674]" family="Ostenocarididae" genus="Paraclausocaris" higherTaxonomySource="GBIF" kingdom="Animalia" pageId="28" pageNumber="29" phylum="Arthropoda" rank="genus">
<emphasis id="7BF2EAD6996AFFCE2B0DF9BCFC2AF090" box="[1125,1319,1648,1674]" italics="true" pageId="28" pageNumber="29">Paraclausocaris</emphasis>
</taxonomicName>
, while in
<taxonomicName id="8E864D47996AFFCE2FB3F95FF864F0B7" authorityName="Polz" authorityYear="1989" box="[219,361,1683,1709]" genus="Clausocaris" higherTaxonomySource="GBIF" kingdom="Animalia" pageId="28" pageNumber="29" phylum="Arthropoda" rank="genus">
<emphasis id="7BF2EAD6996AFFCE2FB3F95FF864F0B7" box="[219,361,1683,1709]" italics="true" pageId="28" pageNumber="29">Clausocaris</emphasis>
</taxonomicName>
the posterior margin is absent and the optic notch occupies the whole margin. As a result of these differences, we erect
<taxonomicName id="8E864D47996AFFCE2D73F97BFBD0F0CB" authorityName="Laville &amp; Forel &amp; Charbonnier" authorityYear="2023" box="[539,733,1719,1745]" family="Ostenocarididae" genus="Paraclausocaris" higherTaxonomySource="GBIF" kingdom="Animalia" pageId="28" pageNumber="29" phylum="Arthropoda" rank="genus">
<emphasis id="7BF2EAD6996AFFCE2D73F97BFBD0F0CB" box="[539,733,1719,1745]" italics="true" pageId="28" pageNumber="29">Paraclausocaris</emphasis>
</taxonomicName>
.
</paragraph>
<paragraph id="493936C4996AFFCF2FD5F935FA6CF795" blockId="28.[188,1399,1785,1990]" lastBlockId="29.[189,1399,265,399]" lastPageId="29" lastPageNumber="30" pageId="28" pageNumber="29">
One last morphological trait should also be discussed here: the number of posterior trunk appendages. In
<taxonomicName id="8E864D47996AFFCE2FB7F8D0F8ACF12C" authority="Laville &amp; Forel &amp; Charbonnier, 2023" authorityName="Laville &amp; Forel &amp; Charbonnier" authorityYear="2023" box="[223,417,1820,1846]" family="Ostenocarididae" genus="Paraclausocaris" higherTaxonomySource="GBIF" kingdom="Animalia" pageId="28" pageNumber="29" phylum="Arthropoda" rank="genus" status="gen. nov.">
<emphasis id="7BF2EAD6996AFFCE2FB7F8D0F8ACF12C" box="[223,417,1820,1846]" italics="true" pageId="28" pageNumber="29">Paraclausocaris</emphasis>
</taxonomicName>
<taxonomicNameLabel id="60C157AD996AFFCE2EC5F8D1FB10F12D" box="[429,541,1821,1847]" pageId="28" pageNumber="29" rank="genus">gen. nov.</taxonomicNameLabel>
, we recognize nine pairs of posterior trunk appendages.
<bibRefCitation id="2D174B35996AFFCE2BABF8D0FC7BF12D" author="Arduini P." box="[1219,1398,1820,1847]" pageId="28" pageNumber="29" pagination="265 - 272" refId="ref24018" refString="Arduini P. 1992. Clausocaris pinnai n. sp., (Order Clausocarida nov.), thylacocephalan crustacean from the Norian of the Preone Valley (Udine, N. Italy) and morphological considerations on Thylacocephala. Atti della Societa italiana di Scienze naturali e del Museo civico di Storia naturale di Milano 132 (21): 265 - 272." type="journal article" year="1992">Arduini (1992)</bibRefCitation>
described eight posterior trunk appendages in
<taxonomicName id="8E864D47996AFFCE2D87F88CFADEF140" authorityName="Arduini" authorityYear="1992" box="[751,979,1856,1882]" genus="Clausocaris" higherTaxonomySource="GBIF" kingdom="Animalia" pageId="28" pageNumber="29" phylum="Arthropoda" rank="species" species="pinnai">
<emphasis id="7BF2EAD6996AFFCE2D87F88CFADEF140" box="[751,979,1856,1882]" italics="true" pageId="28" pageNumber="29">Clausocaris pinnai</emphasis>
</taxonomicName>
, but based on pictures from
<bibRefCitation id="2D174B35996AFFCE2A5FF88CF878F164" author="Dalla Vecchia F. M." pageId="28" pageNumber="29" refId="ref25327" refString="Dalla Vecchia F. M. 2012. Il Friuli 215 milioni di anni fa. Gli straordinari fossili di Preone: finestra su di un mondo scomparso. Comune di Preone." type="book" year="2012">Dalla Vecchia (2012)</bibRefCitation>
, there may actually be nine as in
<taxonomicName id="8E864D47996AFFCE2C7FF8A8FAD4F164" authorityName="Laville &amp; Forel &amp; Charbonnier" authorityYear="2023" box="[791,985,1892,1918]" family="Ostenocarididae" genus="Paraclausocaris" higherTaxonomySource="GBIF" kingdom="Animalia" pageId="28" pageNumber="29" phylum="Arthropoda" rank="genus">
<emphasis id="7BF2EAD6996AFFCE2C7FF8A8FAD4F164" box="[791,985,1892,1918]" italics="true" pageId="28" pageNumber="29">Paraclausocaris</emphasis>
</taxonomicName>
. However, it is different from the number reported by
<bibRefCitation id="2D174B35996AFFCE2EC3F844FB39F1B8" author="Polz H." box="[427,564,1928,1954]" pageId="28" pageNumber="29" pagination="93 - 109" refId="ref28253" refString="Polz H. 1990. Clausocaris lithographica (? Crustacea, Thylacocephala). Archaeopteryx 8: 93 - 109." type="journal article" year="1990">Polz (1990)</bibRefCitation>
or
<bibRefCitation id="2D174B35996AFFCE2D34F844FA3FF1B8" author="Haug C. &amp; Briggs D. E. G. &amp; Mikulic D. G. &amp; Kluessendorf J. &amp; Haug J. T." box="[604,818,1928,1954]" pageId="28" pageNumber="29" pagination="159" refId="ref26319" refString="Haug C., Briggs D. E. G., Mikulic D. G., Kluessendorf J. &amp; Haug J. T. 2014. The implications of a Silurian and other thylacocephalan crustaceans for the functional morphology and systematic affinities of the group. BMC Evolutionary Biology 14: 159. https: // doi. org / 10.1186 / s 12862 - 014 - 0159 - 2" type="journal article" year="2014">
Haug
<emphasis id="7BF2EAD6996AFFCE2DCAF844FBD0F1B8" box="[674,733,1928,1954]" italics="true" pageId="28" pageNumber="29">et al.</emphasis>
(2014)
</bibRefCitation>
for
<taxonomicName id="8E864D47996AFFCE2C0AF844FD95F1B8" baseAuthorityName="Oppenheim" baseAuthorityYear="1888" box="[866,1176,1928,1954]" genus="Clausocaris" higherTaxonomySource="GBIF" kingdom="Animalia" pageId="28" pageNumber="29" phylum="Arthropoda" rank="species" species="lithographica">
<emphasis id="7BF2EAD6996AFFCE2C0AF844FD95F1B8" box="[866,1176,1928,1954]" italics="true" pageId="28" pageNumber="29">Clausocaris lithographica</emphasis>
</taxonomicName>
. They respectively reported 10 or 11 posterior trunk appendages for this species. Interspecific variation in the number of posterior trunk appendages is not uncommon among
<taxonomicName id="8E864D47996BFFCF2C2BFEC5FDB0F739" authority="(Schram 2014)" authorityName="Pinna, Arduini, Pesarini &amp; Teruzzi" authorityYear="1982" baseAuthorityName="Schram" baseAuthorityYear="2014" box="[835,1213,265,291]" class="Thylacocephala" genus="Thylacocephala" infraClass="Thylacocephala" kingdom="Animalia" pageId="29" pageNumber="59" rank="genus">
Thylacocephala (
<bibRefCitation id="2D174B35996BFFCF2B67FEC5FDB8F739" author="Schram F. R." box="[1039,1205,265,291]" pageId="29" pageNumber="30" pagination="340 - 363" refId="ref28925" refString="Schram F. R. 2014. Family level classification within Thylacocephala, with comments on their evolution and possible relationships. Crustaceana 87 (3): 340 - 363. https: // doi. org / 10.1163 / 15685403 - 00003289" type="journal article" year="2014">Schram 2014</bibRefCitation>
)
</taxonomicName>
. However, it is quite unusual to find such variation among closely related forms: for instance, eight posterior trunk appendages are usually reported in
<taxonomicName id="8E864D47996BFFCF2D0CFE9DFD17F771" box="[612,1050,336,363]" pageId="29" pageNumber="30">
<emphasis id="7BF2EAD6996BFFCF2D0CFE9DFA0DF771" box="[612,768,337,363]" italics="true" pageId="29" pageNumber="30">Concavicaris</emphasis>
species (
<bibRefCitation id="2D174B35996BFFCF2C06FE9CFD1FF771" author="Schram F. R." box="[878,1042,336,363]" pageId="29" pageNumber="30" pagination="340 - 363" refId="ref28925" refString="Schram F. R. 2014. Family level classification within Thylacocephala, with comments on their evolution and possible relationships. Crustaceana 87 (3): 340 - 363. https: // doi. org / 10.1163 / 15685403 - 00003289" type="journal article" year="2014">Schram 2014</bibRefCitation>
)
</taxonomicName>
. Thus, it will be necessary to revise
<taxonomicName id="8E864D47996BFFCF2E62FEB9F875F794" authorityName="Arduini" authorityYear="1992" box="[266,376,373,399]" genus="Clausocaris" higherTaxonomySource="GBIF" kingdom="Animalia" pageId="29" pageNumber="30" phylum="Arthropoda" rank="species" species="pinnai">
<emphasis id="7BF2EAD6996BFFCF2E62FEB9F875F794" box="[266,376,373,399]" italics="true" pageId="29" pageNumber="30">C. pinnai</emphasis>
</taxonomicName>
to confirm its assignment to
<taxonomicName id="8E864D47996BFFCF2DA4FEB8FA57F794" authorityName="Polz" authorityYear="1989" box="[716,858,372,398]" genus="Clausocaris" higherTaxonomySource="GBIF" kingdom="Animalia" pageId="29" pageNumber="30" phylum="Arthropoda" rank="genus">
<emphasis id="7BF2EAD6996BFFCF2DA4FEB8FA57F794" box="[716,858,372,398]" italics="true" pageId="29" pageNumber="30">Clausocaris</emphasis>
</taxonomicName>
.
</paragraph>
</subSubSection>
</treatment>
</document>