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<document id="7EED53965DD00CAF5397C7F261F79D7C" ID-CLB-Dataset="305035" ID-DOI="10.5852/ejt.2024.968.2723" ID-GBIF-Dataset="21b497f6-a2ee-4af8-b2e0-027aadacb4eb" ID-ISSN="2118-9773" ID-Zenodo-Dep="14047314" ID-ZooBank="35322F0D-0A5C-4227-AB4D-D4758ECA6E7A" IM.bibliography_approvedBy="felipe" IM.illustrations_approvedBy="felipe" IM.materialsCitations_approvedBy="felipe" IM.metadata_approvedBy="felipe" IM.taxonomicNames_approvedBy="felipe" IM.treatmentCitations_approvedBy="felipe" IM.treatments_approvedBy="felipe" checkinTime="1730916893761" checkinUser="plazi" docAuthor="Poletaev, Vladyslav" docDate="2024" docId="03BA8E195957D209FDD5CF0BFDFFB4F7" docLanguage="en" docName="EJT.2024.968.132-155.pdf" docOrigin="European Journal of Taxonomy 968" docSource="https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/2723/12515" docStyle="DocumentStyle:EF2B578F1D15862ADE45B0C07C620911.14:EJT.2018-.journal_article.type1" docStyleId="EF2B578F1D15862ADE45B0C07C620911" docStyleName="EJT.2018-.journal_article.type1" docStyleVersion="14" docTitle="Meristorygma Carter 1974" docType="treatment" docVersion="4" lastPageNumber="139" masterDocId="FF83F6615950D20EFF9ACC29FFFCB35A" masterDocTitle="New and revised taxa of Carboniferous spiriferides (Brachiopoda, Spiriferida) from the Donets Basin (Ukraine) and South Urals (Russia)" masterLastPageNumber="155" masterPageNumber="132" pageNumber="139" updateTime="1731010174111" updateUser="ExternalLinkService" 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="A74861D1ACFABC8E3BD09295C9C5FEEB">New and revised taxa of Carboniferous spiriferides (Brachiopoda, Spiriferida) from the Donets Basin (Ukraine) and South Urals (Russia)</mods:title>
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<mods:namePart id="C75B5996C8F456396F3C4535E56F15D3">Poletaev, Vladyslav</mods:namePart>
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<mods:affiliation id="9955A78DC9E257931A00ADD22AED1985">Institute of Geological Sciences of the National Academy of Sciences of Ukraine, 55 - b, Oles Honchar St., Kyiv, 01054, Ukraine.</mods:affiliation>
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<mods:date id="5F61619BF7D78644EB8CC4AF159B2E14">2024</mods:date>
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<subSubSection id="C3096C845957D209FDD5CF0BFC18B066" box="[591,996,802,828]" pageId="7" pageNumber="139" type="nomenclature">
<paragraph id="8BAC3F0F5957D209FDD5CF0BFC18B066" blockId="7.[591,996,802,828]" box="[591,996,802,828]" pageId="7" pageNumber="139">
<heading id="D0E488635957D209FDD5CF0BFC18B066" box="[591,996,802,828]" centered="true" fontSize="11" level="2" pageId="7" pageNumber="139" reason="2">
Genus
<taxonomicName id="4C13448C5957D209FD38CF0BFC18B066" authority="Carter, 1974" authorityName="Carter" authorityYear="1974" box="[674,996,802,828]" class="Rhynchonellata" family="Brachythyrididae" genus="Meristorygma" higherTaxonomySource="GBIF" kingdom="Animalia" order="Spiriferida" pageId="7" pageNumber="139" phylum="Brachiopoda" rank="genus">
<emphasis id="B967E31D5957D209FD38CF0BFCB7B066" bold="true" box="[674,843,802,828]" italics="true" pageId="7" pageNumber="139">Meristorygma</emphasis>
<bibRefCitation id="EF8242FE5957D209FCC9CF0BFC18B066" author="Carter J. L." box="[851,996,802,828]" pageId="7" pageNumber="139" pagination="674 - 696" refId="ref9982" refString="Carter J. L. 1974. New genera of spiriferid and brachythyridid brachiopods. Journal of Paleontology 48 (4): 674 - 696." type="journal article" year="1974">Carter, 1974</bibRefCitation>
</taxonomicName>
</heading>
</paragraph>
</subSubSection>
<subSubSection id="C3096C845957D209FF27CF4DFCB6B0F6" pageId="7" pageNumber="139" type="type_taxon">
<paragraph id="8BAC3F0F5957D209FF27CF4DFEA4B027" blockId="7.[189,344,867,894]" box="[189,344,867,894]" pageId="7" pageNumber="139">
<heading id="D0E488635957D209FF27CF4DFEA4B027" bold="true" box="[189,344,867,894]" fontSize="11" level="3" pageId="7" pageNumber="139" reason="3">
<emphasis id="B967E31D5957D209FF27CF4DFEA4B027" bold="true" box="[189,344,867,894]" pageId="7" pageNumber="139">
<typeStatus id="54A881AD5957D209FF27CF4DFF06B024" box="[189,250,868,894]" pageId="7" pageNumber="139">Type</typeStatus>
species
</emphasis>
</heading>
</paragraph>
<paragraph id="8BAC3F0F5957D209FF27CFBAFCB6B0F6" blockId="7.[189,842,914,940]" box="[189,842,914,940]" pageId="7" pageNumber="139">
<taxonomicName id="4C13448C5957D209FF27CFBAFDADB0F6" authority="Carter, 1974" authorityName="Carter" authorityYear="1974" box="[189,593,914,940]" class="Rhynchonellata" family="Brachythyrididae" genus="Meristorygma" higherTaxonomySource="CoL" kingdom="Animalia" order="Spiriferida" pageId="7" pageNumber="139" phylum="Brachiopoda" rank="species" species="arctica">
<emphasis id="B967E31D5957D209FF27CFBAFE44B0F6" box="[189,440,915,940]" italics="true" pageId="7" pageNumber="139">Meristorygma arctica</emphasis>
<bibRefCitation id="EF8242FE5957D209FE25CFBBFDADB0F6" author="Carter J. L." box="[447,593,914,940]" pageId="7" pageNumber="139" pagination="674 - 696" refId="ref9982" refString="Carter J. L. 1974. New genera of spiriferid and brachythyridid brachiopods. Journal of Paleontology 48 (4): 674 - 696." type="journal article" year="1974">Carter, 1974</bibRefCitation>
</taxonomicName>
; original designation.
</paragraph>
</subSubSection>
<subSubSection id="C3096C845957D209FF27CFFAFCD6B796" pageId="7" pageNumber="139" type="diagnosis">
<paragraph id="8BAC3F0F5957D209FF27CFFAFECAB0B7" blockId="7.[189,310,979,1005]" box="[189,310,979,1005]" pageId="7" pageNumber="139">
<heading id="D0E488635957D209FF27CFFAFECAB0B7" bold="true" box="[189,310,979,1005]" fontSize="11" level="3" pageId="7" pageNumber="139" reason="3">
<emphasis id="B967E31D5957D209FF27CFFAFECAB0B7" bold="true" box="[189,310,979,1005]" pageId="7" pageNumber="139">Diagnosis</emphasis>
</heading>
</paragraph>
<paragraph id="8BAC3F0F5957D209FF27C82BFCD6B796" blockId="7.[187,1401,1026,1229]" pageId="7" pageNumber="139">Medium-sized shell with diverse outline; fold and sulcus moderately developed. Well-defined sulcus with two, rarely four primary ribs and median furrow; uniplicate anterior commissure usually with subquadrate tongue; fold with three distinct ribs; the central with weakly furrow. Ribs on sides are few and weak. Hinge line of short, smooth ventral interarea non-denticulated. Ventral adminicula and dorsal crural plates are absent; vascula ramose, radially arranged with a pair of strong vascular media, which correspond to the pair of costae in the sulcus. Microornament is absent.</paragraph>
</subSubSection>
<subSubSection id="C3096C845957D209FF27C8DAFD5FB5EA" pageId="7" pageNumber="139" type="taxon_list">
<paragraph id="8BAC3F0F5957D209FF27C8DAFE70B657" blockId="7.[189,396,1267,1293]" box="[189,396,1267,1293]" pageId="7" pageNumber="139">
<heading id="D0E488635957D209FF27C8DAFE70B657" bold="true" box="[189,396,1267,1293]" fontSize="11" level="3" pageId="7" pageNumber="139" reason="3">
<emphasis id="B967E31D5957D209FF27C8DAFE70B657" bold="true" box="[189,396,1267,1293]" pageId="7" pageNumber="139">Species included</emphasis>
</heading>
</paragraph>
<paragraph id="8BAC3F0F5957D209FF27C90BFE8CB605" blockId="7.[189,1399,1314,1375]" pageId="7" pageNumber="139">
Arctic
<collectingCountry id="F3047F9F5957D209FE8CC90BFE92B666" box="[278,366,1314,1340]" name="Canada" pageId="7" pageNumber="139">Canada</collectingCountry>
and southeastern Alaska (
<bibRefCitation id="EF8242FE5957D209FD5BC90BFC5CB666" author="Carter J. L." box="[705,928,1314,1340]" pageId="7" pageNumber="139" pagination="674 - 696" refId="ref9982" refString="Carter J. L. 1974. New genera of spiriferid and brachythyridid brachiopods. Journal of Paleontology 48 (4): 674 - 696." type="journal article" year="1974">Carter 1974: 674</bibRefCitation>
):
<taxonomicName id="4C13448C5957D209FC27C90AFA8EB666" authority="Carter, 1974" authorityName="Carter" authorityYear="1974" box="[957,1394,1314,1340]" class="Rhynchonellata" family="Brachythyrididae" genus="Meristorygma" higherTaxonomySource="CoL" kingdom="Animalia" order="Spiriferida" pageId="7" pageNumber="139" phylum="Brachiopoda" rank="species" species="arctica">
<emphasis id="B967E31D5957D209FC27C90AFB39B666" box="[957,1221,1315,1340]" italics="true" pageId="7" pageNumber="139">Meristorygma arctica</emphasis>
<bibRefCitation id="EF8242FE5957D209FB4EC90BFA8EB666" author="Carter J. L." box="[1236,1394,1314,1340]" pageId="7" pageNumber="139" pagination="674 - 696" refId="ref9982" refString="Carter J. L. 1974. New genera of spiriferid and brachythyridid brachiopods. Journal of Paleontology 48 (4): 674 - 696." type="journal article" year="1974">Carter, 1974</bibRefCitation>
</taxonomicName>
; Pennsylvanian.
</paragraph>
<paragraph id="8BAC3F0F5957D209FF27C9AEFB63B69E" blockId="7.[189,1399,1415,1476]" pageId="7" pageNumber="139">
<collectingCountry id="F3047F9F5957D209FF27C9AEFEF2B6FB" box="[189,270,1415,1441]" name="Russia" pageId="7" pageNumber="139">Russia</collectingCountry>
, Northern and Polar Ural (
<bibRefCitation id="EF8242FE5957D209FDDCC9AEFD17B6FB" author="Kutorga S. S." box="[582,747,1415,1441]" pageId="7" pageNumber="139" pagination="62 - 104" refId="ref11224" refString="Kutorga S. S. 1844. Zweiter Beitrage zur Palaeontologie Russlands. Verhandlungen der Russisch- Kaiserlichen mineralogischen Gesellschaft zu St. Petersburg 1844: 62 - 104." type="journal article" year="1844">Kutorga 1844</bibRefCitation>
;
<bibRefCitation id="EF8242FE5957D209FD6DC9AEFC33B6FB" author="Kalashnikov N. V." box="[759,975,1415,1441]" pageId="7" pageNumber="139" refId="ref10968" refString="Kalashnikov N. V. 1980. Brakhiopody verkhnego paleozoya Yevropeiskogo Severa SSSR. Nauka, Leningrad." type="book" year="1980">Kalashnikov 1980</bibRefCitation>
):
<taxonomicName id="4C13448C5957D209FC79C9AEFA8EB6FB" authority="(Kutorga, 1844)" baseAuthorityName="Kutorga" baseAuthorityYear="1844" box="[995,1394,1415,1441]" class="Rhynchonellata" family="Brachythyrididae" genus="Meristorygma" higherTaxonomySource="CoL" kingdom="Animalia" order="Spiriferida" pageId="7" pageNumber="139" phylum="Brachiopoda" rank="species" species="panduriformis">
<emphasis id="B967E31D5957D209FC79C9AEFB52B6FB" box="[995,1198,1415,1441]" italics="true" pageId="7" pageNumber="139">M. panduriformis</emphasis>
(
<bibRefCitation id="EF8242FE5957D209FB27C9AEFA95B6FB" author="Kutorga S. S." box="[1213,1385,1415,1441]" pageId="7" pageNumber="139" pagination="62 - 104" refId="ref11224" refString="Kutorga S. S. 1844. Zweiter Beitrage zur Palaeontologie Russlands. Verhandlungen der Russisch- Kaiserlichen mineralogischen Gesellschaft zu St. Petersburg 1844: 62 - 104." type="journal article" year="1844">Kutorga, 1844</bibRefCitation>
)
</taxonomicName>
; upper PennsylvanianLower Permian;
<taxonomicName id="4C13448C5957D209FD1EC982FBF7B69E" authority="Kalashnikov, 1980" authorityName="Kalashnikov" authorityYear="1980" box="[644,1035,1450,1476]" class="Rhynchonellata" family="Brachythyrididae" genus="Meristorygma" higherTaxonomySource="CoL" kingdom="Animalia" order="Spiriferida" pageId="7" pageNumber="139" phylum="Brachiopoda" rank="species" species="pajkchoica">
<emphasis id="B967E31D5957D209FD1EC982FCD5B69E" box="[644,809,1450,1476]" italics="true" pageId="7" pageNumber="139">M. pajkchoica</emphasis>
<bibRefCitation id="EF8242FE5957D209FCAAC983FBF7B69E" author="Kalashnikov N. V." box="[816,1035,1450,1476]" pageId="7" pageNumber="139" refId="ref10968" refString="Kalashnikov N. V. 1980. Brakhiopody verkhnego paleozoya Yevropeiskogo Severa SSSR. Nauka, Leningrad." type="book" year="1980">Kalashnikov, 1980</bibRefCitation>
</taxonomicName>
; Moscovian.
</paragraph>
<paragraph id="8BAC3F0F5957D209FF27C9C2FD2EB516" blockId="7.[186,1399,1515,1612]" pageId="7" pageNumber="139">
South Ural (
<collectingRegion id="49D7F1ED5957D209FED9C9C2FE10B55F" box="[323,492,1515,1541]" country="Russia" name="Bashkortostan" pageId="7" pageNumber="139">Bashkortostan</collectingRegion>
)and Middle Asia (
<bibRefCitation id="EF8242FE5957D209FD21C9C2FC6CB55F" author="Yanishevsky M. E." box="[699,912,1515,1541]" pageId="7" pageNumber="139" pagination="1 - 140" refId="ref12904" refString="Yanishevsky M. E. 1900. Fauna kamennougol'nogo izvestnyaka, vystupayushchego po r. Shartymke, na vostochnom sklone Urala. Trudy Obshchestva yestestvoispytateley pri Imperatorskom Kazanskom universitete 34 (5): 1 - 140." type="journal article" year="1900">Yanishevsky 1900</bibRefCitation>
;
<bibRefCitation id="EF8242FE5957D209FC03C9C2FBBEB55F" author="Poletaev V. I." box="[921,1090,1515,1541]" pageId="7" pageNumber="139" refId="ref12191" refString="Poletaev V. I. 2018. Atlas-opredelitel' kamennougol'nykh spiriferid Vostochnoy Yevropy. LAT &amp; K, Kyiv." type="book" year="2018">Poletaev 2018</bibRefCitation>
):
<taxonomicName id="4C13448C5957D209FBCAC9C5FF01B573" authority="(Yanishevsky, 1900)" baseAuthorityName="Yanishevsky" baseAuthorityYear="1900" class="Rhynchonellata" family="Brachythyrididae" genus="Meristorygma" higherTaxonomySource="CoL" kingdom="Animalia" order="Spiriferida" pageId="7" pageNumber="139" phylum="Brachiopoda" rank="species" species="gracilis">
<emphasis id="B967E31D5957D209FBCAC9C5FB32B55F" box="[1104,1230,1515,1541]" italics="true" pageId="7" pageNumber="139">M. gracilis</emphasis>
(
<bibRefCitation id="EF8242FE5957D209FB47C9C2FF09B573" author="Yanishevsky M. E." pageId="7" pageNumber="139" pagination="1 - 140" refId="ref12904" refString="Yanishevsky M. E. 1900. Fauna kamennougol'nogo izvestnyaka, vystupayushchego po r. Shartymke, na vostochnom sklone Urala. Trudy Obshchestva yestestvoispytateley pri Imperatorskom Kazanskom universitete 34 (5): 1 - 140." type="journal article" year="1900">Yanishevsky, 1900</bibRefCitation>
)
</taxonomicName>
upper Serpukhovianlower Bashkirian; (this paper)
<taxonomicName id="4C13448C5957D209FCE7CA26FB15B573" authority="Poletaev, 2018" authorityName="Poletaev" authorityYear="2018" box="[893,1257,1550,1577]" class="Rhynchonellata" family="Brachythyrididae" genus="Meristorygma" higherTaxonomySource="CoL" kingdom="Animalia" order="Spiriferida" pageId="7" pageNumber="139" phylum="Brachiopoda" rank="species" species="donakovae">
<emphasis id="B967E31D5957D209FCE7CA26FBD4B572" box="[893,1064,1550,1576]" italics="true" pageId="7" pageNumber="139">M. donakovae</emphasis>
<bibRefCitation id="EF8242FE5957D209FBAECA27FB15B573" author="Poletaev V. I." box="[1076,1257,1550,1577]" pageId="7" pageNumber="139" refId="ref12191" refString="Poletaev V. I. 2018. Atlas-opredelitel' kamennougol'nykh spiriferid Vostochnoy Yevropy. LAT &amp; K, Kyiv." type="book" year="2018">Poletaev, 2018</bibRefCitation>
</taxonomicName>
; uppermost ViseanSerpukhovian, Magnitogorsk district.
</paragraph>
<paragraph id="8BAC3F0F5957D209FF27CA5AFD5FB5EA" blockId="7.[189,1398,1651,1713]" pageId="7" pageNumber="139">
<collectingCountry id="F3047F9F5957D209FF27CA5AFEE3B5D7" box="[189,287,1651,1677]" name="Ukraine" pageId="7" pageNumber="139">Ukraine</collectingCountry>
, Donets Basin (
<bibRefCitation id="EF8242FE5957D209FE79CA5AFD91B5D4" author="Rotai A. P." box="[483,621,1651,1678]" pageId="7" pageNumber="139" refId="ref12376" refString="Rotai A. P. 1951. Brakhiopody srednego karbona Donetskogo basseyna. 1. Spiriferidae. Gosgeolizdat, Moscow." type="book" year="1951">Rotai 1951</bibRefCitation>
;
<bibRefCitation id="EF8242FE5957D209FDE4CA5AFCD1B5D7" author="Poletaev V. I." box="[638,813,1651,1677]" pageId="7" pageNumber="139" refId="ref12191" refString="Poletaev V. I. 2018. Atlas-opredelitel' kamennougol'nykh spiriferid Vostochnoy Yevropy. LAT &amp; K, Kyiv." type="book" year="2018">Poletaev 2018</bibRefCitation>
):
<taxonomicName id="4C13448C5957D209FCDFCA5DFB6BB5D4" authority="(Rotai, 1951)" baseAuthorityName="Rotai" baseAuthorityYear="1951" box="[837,1175,1651,1678]" class="Rhynchonellata" family="Brachythyrididae" genus="Meristorygma" higherTaxonomySource="CoL" kingdom="Animalia" order="Spiriferida" pageId="7" pageNumber="139" phylum="Brachiopoda" rank="species" species="miussensis">
<emphasis id="B967E31D5957D209FCDFCA5DFC10B5D7" box="[837,1004,1652,1677]" italics="true" pageId="7" pageNumber="139">M. miussensis</emphasis>
(
<bibRefCitation id="EF8242FE5957D209FB9ACA5AFB73B5D4" author="Rotai A. P." box="[1024,1167,1651,1678]" pageId="7" pageNumber="139" refId="ref12376" refString="Rotai A. P. 1951. Brakhiopody srednego karbona Donetskogo basseyna. 1. Spiriferidae. Gosgeolizdat, Moscow." type="book" year="1951">Rotai, 1951</bibRefCitation>
)
</taxonomicName>
upper Bashkirian;
<taxonomicName id="4C13448C5957D209FF27CABEFDF3B5EB" authority="(Rotai, 1951)" baseAuthorityName="Rotai" baseAuthorityYear="1951" box="[189,527,1686,1713]" class="Rhynchonellata" family="Brachythyrididae" genus="Meristorygma" higherTaxonomySource="CoL" kingdom="Animalia" order="Spiriferida" pageId="7" pageNumber="139" phylum="Brachiopoda" rank="species" species="postgracilis">
<emphasis id="B967E31D5957D209FF27CABEFE97B5EA" box="[189,363,1686,1712]" italics="true" pageId="7" pageNumber="139">M. postgracilis</emphasis>
(
<bibRefCitation id="EF8242FE5957D209FEE0CABFFDFAB5EB" author="Rotai A. P." box="[378,518,1686,1713]" pageId="7" pageNumber="139" refId="ref12376" refString="Rotai A. P. 1951. Brakhiopody srednego karbona Donetskogo basseyna. 1. Spiriferidae. Gosgeolizdat, Moscow." type="book" year="1951">Rotai, 1951</bibRefCitation>
)
</taxonomicName>
; Moscovian.
</paragraph>
</subSubSection>
<subSubSection id="C3096C845957D209FF27CAF1FDFFB4F7" pageId="7" pageNumber="139" type="discussion">
<paragraph id="8BAC3F0F5957D209FF27CAF1FED3B5A8" blockId="7.[189,303,1752,1778]" box="[189,303,1752,1778]" pageId="7" pageNumber="139">
<heading id="D0E488635957D209FF27CAF1FED3B5A8" bold="true" box="[189,303,1752,1778]" fontSize="11" level="3" pageId="7" pageNumber="139" reason="3">
<emphasis id="B967E31D5957D209FF27CAF1FED3B5A8" bold="true" box="[189,303,1752,1778]" pageId="7" pageNumber="139">Remarks</emphasis>
</heading>
</paragraph>
<paragraph id="8BAC3F0F5957D209FF27CB2FFDFFB4F7" blockId="7.[188,1400,1798,1965]" pageId="7" pageNumber="139">
The analysis of the ventral valve of the natural mould of
<taxonomicName id="4C13448C5957D209FCD1CB2EFA8AB47A" authority="(Carter &amp; Poletaev 1998)" baseAuthorityName="Carter &amp; Poletaev" baseAuthorityYear="1998" box="[843,1398,1798,1824]" class="Rhynchonellata" family="Brachythyrididae" genus="Meristorygma" higherTaxonomySource="CoL" kingdom="Animalia" order="Spiriferida" pageId="7" pageNumber="139" phylum="Brachiopoda" rank="species" species="arctica">
<emphasis id="B967E31D5957D209FCD1CB2EFBB5B47A" box="[843,1097,1799,1824]" italics="true" pageId="7" pageNumber="139">Meristorygma arctica</emphasis>
(
<bibRefCitation id="EF8242FE5957D209FBC2CB2FFA92B47A" author="Carter J. L. &amp; Poletaev V. I." box="[1112,1390,1798,1824]" pageId="7" pageNumber="139" pagination="105 - 180" refId="ref10064" refString="Carter J. L. &amp; Poletaev V. I. 1998. Atokan (Late Bashkirian or Early Moscovian) brachiopods from the Hare Fiord formation of Ellesmere Island, Canadian Arctic Archipelago. Annals of Carnegie Museum 67 (2): 105 - 180. https: // doi. org / 10.5962 / p. 215207" type="journal article" year="1998">Carter &amp; Poletaev 1998</bibRefCitation>
)
</taxonomicName>
has shown that the species has a ramose, radially arranged vascular system with a twin of strong vascular media, in contrast to
<taxonomicName id="4C13448C5957D209FE26CB64FC99B43D" authority="(Phillips, 1836)" baseAuthorityName="Phillips" baseAuthorityYear="1836" box="[444,869,1869,1895]" class="Rhynchonellata" family="Brachythyrididae" genus="Brachythyris" higherTaxonomySource="CoL,GBIF" kingdom="Animalia" order="Spiriferida" pageId="7" pageNumber="139" phylum="Brachiopoda" rank="species" species="ovalis">
<emphasis id="B967E31D5957D209FE26CB64FD5EB43D" box="[444,674,1869,1895]" italics="true" pageId="7" pageNumber="139">Brachythyris ovalis</emphasis>
(Phillips, 1836)
</taxonomicName>
, which has a weak, simple, pinnate vascular system. The variability of the vascular system of related taxa may mostly be the result of evolution (
<bibRefCitation id="EF8242FE5957D209FF5FCBBAFE0AB4F7" author="Lazarev S. S. &amp; Poletaev V. I." box="[197,502,1939,1965]" pageId="7" pageNumber="139" pagination="89 - 94" refId="ref11313" refString="Lazarev S. S. &amp; Poletaev V. I. 1982. The development of the Brachiopod mantle canal system at the early-middle Carboniferous boundary. In: Ramsbottom W. H. (ed.) Biostratigraphic Data for a Mid- Carboniferous Boundary: 89 - 94. Leeds." type="book chapter" year="1982">Lazarev &amp; Poletaev 1982</bibRefCitation>
).
</paragraph>
</subSubSection>
</treatment>
</document>