214 lines
28 KiB
XML
214 lines
28 KiB
XML
<document id="C85051F8D4F3401F9ABF58C57C7346B5" ID-CLB-Dataset="2884" ID-DOI="10.5852/ejt.2021.783.1601" ID-GBIF-Dataset="aa9de9bf-dea4-4321-a51d-6c4f1f55032d" ID-ISSN="2118-9773" ID-Zenodo-Dep="5793422" ID-ZooBank="071EAD63-05ED-4D6C-AC45-8719E6D79E0B" IM.materialsCitations_approvedBy="felipe" IM.metadata_approvedBy="felipe" IM.tables_requiresApprovalFor="existingObjects,plazi" IM.taxonomicNames_approvedBy="felipe" checkinTime="1640009482758" checkinUser="felipe" docAuthor="Kröger, Björn & Pohle, Alexander" docDate="2021" docId="5F4487ACFFEBFFE7FE3F7A82FD747BE9" docLanguage="en" docName="ejt-783_1-102.pdf" docOrigin="European Journal of Taxonomy 783 (1)" docSource="http://dx.doi.org/10.5852/ejt.2021.783.1601" docStyle="DocumentStyle:EF2B578F1D15862ADE45B0C07C620911.14:EJT.2018-.journal_article.type1" docStyleId="EF2B578F1D15862ADE45B0C07C620911" docStyleName="EJT.2018-.journal_article.type1" docStyleVersion="14" docTitle="Nyfrieslandoceras bassleroceroides Kröger & Pohle 2021, gen. et sp. nov." docType="treatment" docUuid="9E26DE1D-597E-4248-BC5C-6CB9461B66D2" docUuidSource="ZooBank" docVersion="11" lastPageNumber="73" masterDocId="A37DFFD4FFACFFAEFFD67F14FFDE7A64" masterDocTitle="Early-Middle Ordovician cephalopods from Ny Friesland, Spitsbergen - a pelagic fauna with Laurentian affinities" masterLastPageNumber="102" masterPageNumber="1" pageNumber="72" updateTime="1701997144043" 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="C9F770C7B4C2ED69211467DA1607CF44">Early-Middle Ordovician cephalopods from Ny Friesland, Spitsbergen - a pelagic fauna with Laurentian affinities</mods:title>
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<mods:namePart id="86130574A763D445DCCA3EFE2B70A030">Kröger, Björn</mods:namePart>
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<mods:affiliation id="C9F3D2FD7226173011C0C59E29916BBB">Finnish Museum of Natural History, University of Helsinki, PO Box 44, FI- 00014 Helsinki, Finland.</mods:affiliation>
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<mods:nameIdentifier id="97802184E48197D006473965684C8224" type="email">bjorn.kroger@helsinki.fi</mods:nameIdentifier>
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<mods:namePart id="75DDF143B0DCDCFD6F49F5B9D24041D3">Pohle, Alexander</mods:namePart>
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<mods:affiliation id="3E39403EEF00FA3AA3F4049DF9032DD1">Paläontologisches Institut und Museum, University of Zurich, Zurich, Switzerland.</mods:affiliation>
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<mods:nameIdentifier id="687059B9AD8139ADF324D0E190E0A73E" type="email">alexander.pohle@pim.uzh.ch</mods:nameIdentifier>
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<mods:title id="ACE7AD0205E655329747A914D244D2F2">European Journal of Taxonomy</mods:title>
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<mods:date id="28713202D59382C30F60B74C4288CF84">2021</mods:date>
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<treatment id="5F4487ACFFEBFFE7FE3F7A82FD747BE9" ID-DOI="http://doi.org/10.5281/zenodo.5793606" ID-GBIF-Taxon="191693621" ID-Zenodo-Dep="5793606" LSID="urn:lsid:zoobank.org:act:9E26DE1D-597E-4248-BC5C-6CB9461B66D2" httpUri="http://treatment.plazi.org/id/5F4487ACFFEBFFE7FE3F7A82FD747BE9" lastPageId="73" lastPageNumber="73" pageId="71" pageNumber="72">
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<subSubSection id="9FF76531FFEBFFE9FE3F7A82FB957FD5" box="[489,1099,1430,1457]" pageId="71" pageNumber="72" type="nomenclature">
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<paragraph id="D75236BAFFEBFFE9FE3F7A82FB957FD5" blockId="71.[363,1224,1430,1528]" box="[489,1099,1430,1457]" pageId="71" pageNumber="72">
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<heading id="8C1A81D6FFEBFFE9FE3F7A82FB957FD5" box="[489,1099,1430,1457]" centered="true" fontSize="11" level="2" pageId="71" pageNumber="72" reason="2">
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<taxonomicName id="10ED4D39FFEBFFE9FE3F7A82FC4D7FD5" authority="Kröger & Pohle, 2021" authorityName="Kröger & Pohle" authorityYear="2021" box="[489,915,1430,1457]" class="Cephalopoda" family="Rioceratidae" genus="Nyfrieslandoceras" higherTaxonomySource="GBIF" kingdom="Animalia" order="Tetrabranchia" pageId="71" pageNumber="72" phylum="Mollusca" rank="species" species="bassleroceroides" status="gen. et sp. nov.">
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<emphasis id="E599EAA8FFEBFFE9FE3F7A82FC4D7FD5" bold="true" box="[489,915,1430,1457]" italics="true" pageId="71" pageNumber="72">Nyfrieslandoceras bassleroceroides</emphasis>
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</taxonomicName>
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<taxonomicNameLabel id="FEAA57D3FFEBFFE9FC4D7A83FB957FD5" box="[923,1099,1431,1457]" pageId="71" pageNumber="72" rank="species">gen. et sp. nov.</taxonomicNameLabel>
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</heading>
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</paragraph>
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<subSubSection id="9FF76531FFEBFFE9FEBD7AAEFC757F93" pageId="71" pageNumber="72" type="description">
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<paragraph id="D75236BAFFEBFFE9FEBD7AAEFB167FB1" blockId="71.[363,1224,1430,1528]" box="[363,1224,1466,1493]" pageId="71" pageNumber="72">
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<uri id="A37C3AB8FFEBFFE9FEBD7AAEFB167FB1" box="[363,1224,1466,1493]" pageId="71" pageNumber="72">
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urn:lsid:zoobank.org:act:
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<uuid id="A34B0C6FFFEBFFE9FD5A7AAEFB167FB1" box="[652,1224,1466,1493]" pageId="71" pageNumber="72">9E26DE1D-597E-4248-BC5C-6CB9461B66D2</uuid>
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</uri>
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</paragraph>
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<paragraph id="D75236BAFFEBFFE9FD5E7AC9FC757F93" blockId="71.[363,1224,1430,1528]" box="[648,939,1501,1528]" pageId="71" pageNumber="72">
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<figureCitation id="4FD62A3FFFEBFFE9FD5E7AC9FD367F93" box="[648,744,1501,1527]" captionStart="Fig" captionStartId="13.[189,232,1769,1795]" captionTargetBox="[201,1391,1387,1719]" captionTargetId="figure-363@13.[189,1398,1376,1731]" captionTargetPageId="13" captionText="Fig. 8. Reconstruction and interpretation of details of connecting ring and septal necks in cyrtoconic cephalopods from the Olenidsletta Member, Floian, Ordovician, Profilstranda section, Ny Friesland, Spitsbergen. A. Lawrenceoceras ebenus sp. nov., FMNH-P30335, holotype, see also Fig. 7B. B. Vallhalloceras floweri Evans & King, 1990, FMNH-P30340, see also Fig. 50B. C. Olenidslettoceras farmi gen. et sp. nov.,FMNH-P30334, holotype, see also Fig. 50A.D. Nyfrieslandoceras bassleroceroides gen. et sp. nov., FMNH-P30353, holotype, see also Fig. 49C. Black: septal neck and septum. Dark grey: connecting ring. Light grey: cameral deposits. Without scale." figureDoi="http://doi.org/10.5281/zenodo.5793444" httpUri="https://zenodo.org/record/5793444/files/figure.png" pageId="71" pageNumber="72">Figs 8D</figureCitation>
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,
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<figureCitation id="4FD62A3FFFEBFFE9FD237AC9FC927F9C" box="[757,844,1501,1528]" captionStart="Fig" captionStartId="65.[189,232,1705,1731]" captionTargetBox="[196,1389,821,1661]" captionTargetId="figure-79@65.[189,1398,813,1666]" captionTargetPageId="65" captionText="Fig. 45. Cephalopods from the Olenidsletta Member, Floian, Ordovician, Profilstranda section, Ny Friesland, Spitsbergen. A–B. Nyfrieslandoceras bassleroceroides gen. et sp. nov., FMNH-P30353, holotype, from bed PO 131. A. Ventral view, prosiphuncular side. B. Lateral view with ventral, prosiphuncular side toward the left. C–D. Order, gen. et sp. indet. A, FMNH-P30354, from bed PO 131. C. Dorsal (?) view. D. Lateral view, with dorsal (?), antisiphuncular side toward the right. E–F. Estonioceratid gen. et sp. indet.A., FMNH-P30342, from bed PO 7.5. E. Lateral view with ventral, prosiphuncular side toward the right. F. adoral view with preserved siphuncular perforation. G. Order, gen. et sp. indet. B, FMNH-P30424, from bed 4.8., lateral view with ventral, prosiphuncular side toward the right. Scale bar = 10 mm for all figures." figureDoi="http://doi.org/10.5281/zenodo.5793560" httpUri="https://zenodo.org/record/5793560/files/figure.png" pageId="71" pageNumber="72">45A–B</figureCitation>
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,
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<figureCitation id="4FD62A3FFFEBFFE9FC8E7AC9FC757F93" box="[856,939,1501,1527]" captionStart="Fig" captionStartId="72.[191,234,1812,1838]" captionTargetBox="[189,1395,1303,1775]" captionTargetId="figure-317@72.[189,1398,1303,1775]" captionTargetPageId="72" captionText="Fig. 49. Median sections of phragmocones of cephalopods from the Olenidsletta Member, Floian, Ordovician, Profilstranda section, Ny Friesland, Spitsbergen. A. Order, gen. et sp. indet. B, FMNH-P30424, from bed 4.8, see also Fig. 11A for interpretation. B–C. Nyfrieslandoceras bassleroceroides gen. et sp. nov., FMNH-P30353, holotype, from bed PO 131. B. Detail with septa and siphuncle preserved, septa are crushed and taphonomically distorted. C. Detail of septal necks and connecting ring, see Fig. 8D for interpretation. Scale bars: A–B = 5 mm; C = 1 mm." figureDoi="http://doi.org/10.5281/zenodo.5793572" httpUri="https://zenodo.org/record/5793572/files/figure.png" pageId="71" pageNumber="72">49B–C</figureCitation>
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</paragraph>
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||
</subSubSection>
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||
<subSubSection id="9FF76531FFEBFFE9FF6B790AFDDD7C0C" box="[189,515,1566,1640]" pageId="71" pageNumber="72" type="diagnosis">
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<paragraph id="D75236BAFFEBFFE9FF6B790AFEE87C5C" blockId="71.[189,310,1566,1592]" box="[189,310,1566,1592]" pageId="71" pageNumber="72">
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||
<heading id="8C1A81D6FFEBFFE9FF6B790AFEE87C5C" bold="true" box="[189,310,1566,1592]" fontSize="11" level="3" pageId="71" pageNumber="72" reason="3">
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||
<emphasis id="E599EAA8FFEBFFE9FF6B790AFEE87C5C" bold="true" box="[189,310,1566,1592]" pageId="71" pageNumber="72">Diagnosis</emphasis>
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</heading>
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</paragraph>
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<paragraph id="D75236BAFFEBFFE9FF6B7959FDDD7C0C" blockId="71.[189,515,1613,1640]" box="[189,515,1613,1640]" pageId="71" pageNumber="72">As for genus, by monotypy.</paragraph>
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</subSubSection>
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<subSubSection id="9FF76531FFEBFFE9FF6B799BFAAE7CBC" box="[189,1392,1679,1752]" pageId="71" pageNumber="72" type="etymology">
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<paragraph id="D75236BAFFEBFFE9FF6B799BFE9A7CCD" blockId="71.[189,324,1679,1705]" box="[189,324,1679,1705]" pageId="71" pageNumber="72">
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<heading id="8C1A81D6FFEBFFE9FF6B799BFE9A7CCD" bold="true" box="[189,324,1679,1705]" fontSize="11" level="3" pageId="71" pageNumber="72" reason="3">
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<emphasis id="E599EAA8FFEBFFE9FF6B799BFE9A7CCD" bold="true" box="[189,324,1679,1705]" pageId="71" pageNumber="72">Etymology</emphasis>
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</heading>
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</paragraph>
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<paragraph id="D75236BAFFEBFFE9FF6B79A9FAAE7CBC" blockId="71.[189,1392,1725,1752]" box="[189,1392,1725,1752]" pageId="71" pageNumber="72">
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Referring to
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<taxonomicName id="10ED4D39FFEBFFE9FE8579A9FCCE7CB3" authority="Ulrich & Foerste, 1936" authorityName="Ulrich & Foerste" authorityYear="1936" box="[339,784,1725,1752]" class="Cephalopoda" family="Bassleroceratidae" genus="Bassleroceras" higherTaxonomySource="GBIF" kingdom="Animalia" order="Tetrabranchia" pageId="71" pageNumber="72" phylum="Mollusca" rank="genus">
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<emphasis id="E599EAA8FFEBFFE9FE8579A9FE267CB3" box="[339,504,1725,1751]" italics="true" pageId="71" pageNumber="72">Bassleroceras</emphasis>
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Ulrich & Foerste, 1936
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</taxonomicName>
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because of its superficial similarity with this genus.
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</paragraph>
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</subSubSection>
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<subSubSection id="9FF76531FFEBFFE6FF6B79E3FCDF7B10" lastPageId="72" lastPageNumber="73" pageId="71" pageNumber="72" type="materials_examined">
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<paragraph id="D75236BAFFEBFFE9FF6B79E3FEB27D75" blockId="71.[189,364,1783,1809]" box="[189,364,1783,1809]" pageId="71" pageNumber="72">
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||
<heading id="8C1A81D6FFEBFFE9FF6B79E3FEB27D75" bold="true" box="[189,364,1783,1809]" fontSize="11" level="3" pageId="71" pageNumber="72" reason="3">
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||
<emphasis id="E599EAA8FFEBFFE9FF6B79E3FEB27D75" bold="true" box="[189,364,1783,1809]" pageId="71" pageNumber="72">Type material</emphasis>
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</heading>
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</paragraph>
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<paragraph id="D75236BAFFEBFFE9FF3C7832FE267D00" blockId="71.[189,504,1830,1892]" pageId="71" pageNumber="72">
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<materialsCitation id="67853CE7FFEBFFE9FF3C7832FE267D00" ID-GBIF-Occurrence="3421082323" collectionCode="FMNH-P" pageId="71" pageNumber="72" specimenCode="FMNH-P30353" specimenCount="1" typeStatus="holotype">
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<emphasis id="E599EAA8FFEBFFE9FF3C7832FE827D24" bold="true" box="[234,348,1830,1856]" pageId="71" pageNumber="72">
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<typeStatus id="08568818FFEBFFE9FF3C7832FE827D24" box="[234,348,1830,1856]" pageId="71" pageNumber="72" type="holotype">Holotype</typeStatus>
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</emphasis>
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||
<specimenCount id="C1EBFD33FFEBFFE9FF6B785DFEEF7D07" box="[189,305,1865,1891]" pageId="71" pageNumber="72" type="generic">Specimen</specimenCount>
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<specimenCode id="874B9EC1FFEBFFE9FEEE785DFE2A7D00" box="[312,500,1865,1892]" collectionCode="FMNH-P" pageId="71" pageNumber="72">FMNH-P30353</specimenCode>
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||
.
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</materialsCitation>
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</paragraph>
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<paragraph id="D75236BAFFEBFFE9FF3C789EFCBC7DA3" blockId="71.[189,866,1930,1992]" pageId="71" pageNumber="72">
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<materialsCitation id="67853CE7FFEBFFE9FF3C789EFC807DA3" ID-GBIF-Occurrence="3421082306" pageId="71" pageNumber="72" specimenCode="FMNH-P30356" specimenCount="1" typeStatus="paratype">
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||
<emphasis id="E599EAA8FFEBFFE9FF3C789EFE827DC0" bold="true" box="[234,348,1930,1956]" pageId="71" pageNumber="72">
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||
<typeStatus id="08568818FFEBFFE9FF3C789EFE827DC0" box="[234,348,1930,1956]" pageId="71" pageNumber="72" type="paratype">Paratype</typeStatus>
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</emphasis>
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||
<specimenCount id="C1EBFD33FFEBFFE9FF6B78B9FEEF7DA3" box="[189,305,1965,1991]" pageId="71" pageNumber="72" type="generic">Specimen</specimenCount>
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||
<specimenCode id="874B9EC1FFEBFFE9FEEE78B9FE2E7DAC" box="[312,496,1965,1992]" pageId="71" pageNumber="72">FMNH-P30356</specimenCode>
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from type horizon and locality
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</materialsCitation>
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||
.
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||
</paragraph>
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<paragraph id="D75236BAFFE4FFE6FF6B7E1DFE257B46" blockId="72.[189,507,264,291]" box="[189,507,264,291]" pageId="72" pageNumber="73">
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<heading id="8C1A81D6FFE4FFE6FF6B7E1DFE257B46" bold="true" box="[189,507,264,291]" fontSize="11" level="3" pageId="72" pageNumber="73" reason="3">
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<emphasis id="E599EAA8FFE4FFE6FF6B7E1DFE257B46" bold="true" box="[189,507,264,291]" pageId="72" pageNumber="73">Type locality and horizon</emphasis>
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</heading>
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||
</paragraph>
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||
<paragraph id="D75236BAFFE4FFE6FF6B7E2CFCDF7B10" blockId="72.[189,1399,311,379]" pageId="72" pageNumber="73">
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From Profilstranda section, Ny
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<collectingRegion id="1529F858FFE4FFE6FDE57E23FD7D7B35" box="[563,675,311,337]" country="Netherlands" name="Fryslan" pageId="72" pageNumber="73">Friesland</collectingRegion>
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||
, Spitsbergen, bed
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<collectionCode id="B1FCAE7FFFE4FFE6FCA87E23FC7D7B35" box="[894,931,311,337]" country="Russia" name="Collection of the Zoological Institute of the Russian Academy of Sciences" pageId="72" pageNumber="73">PO</collectionCode>
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<quantity id="10159B5FFFE4FFE6FC7A7E23FBEA7B36" box="[940,1076,311,338]" metricMagnitude="5" metricUnit="m" metricValue="1.3112799999999998" pageId="72" pageNumber="73" unit="m" value="131128.0">131, 128 m</quantity>
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above base of Olenidsletta Member,
|
||
<collectionCode id="B1FCAE7FFFE4FFE6FEFB7E4FFE9C7B11" box="[301,322,347,373]" country="Canada" lsid="urn:lsid:biocol.org:col:13946" name="Royal British Columbia Museum - Herbarium" pageId="72" pageNumber="73" type="Museum">V</collectionCode>
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||
<subScript id="4B6934FFFFE4FFE6FE947E79FE8A7B1F" attach="left" box="[322,340,365,379]" fontSize="6" pageId="72" pageNumber="73">2b</subScript>
|
||
trilobite zone, Blackhillsian, Floian.
|
||
</paragraph>
|
||
</subSubSection>
|
||
<subSubSection id="9FF76531FFE4FFE7FF6B7E8FFD747BE9" lastPageId="73" lastPageNumber="74" pageId="72" pageNumber="73" type="description">
|
||
<paragraph id="D75236BAFFE4FFE6FF6B7E8FFE907BD1" blockId="72.[189,334,411,437]" box="[189,334,411,437]" pageId="72" pageNumber="73">
|
||
<heading id="8C1A81D6FFE4FFE6FF6B7E8FFE907BD1" bold="true" box="[189,334,411,437]" fontSize="11" level="3" pageId="72" pageNumber="73" reason="3">
|
||
<emphasis id="E599EAA8FFE4FFE6FF6B7E8FFE907BD1" bold="true" box="[189,334,411,437]" pageId="72" pageNumber="73">Description</emphasis>
|
||
</heading>
|
||
</paragraph>
|
||
<paragraph id="D75236BAFFE4FFE6FF6B7EDEFD6E78DC" blockId="72.[188,1401,458,696]" pageId="72" pageNumber="73">
|
||
The type specimen is a
|
||
<quantity id="10159B5FFFE4FFE6FE117EDEFDC67B81" box="[455,536,458,485]" metricMagnitude="-2" metricUnit="m" metricValue="6.2" pageId="72" pageNumber="73" unit="mm" value="62.0">62 mm</quantity>
|
||
long fragment of a phragmocone and a complete body chamber (
|
||
<figureCitation id="4FD62A3FFFE4FFE6FAD77EDEFF0D786C" captionStart="Fig" captionStartId="65.[189,232,1705,1731]" captionTargetBox="[196,1389,821,1661]" captionTargetId="figure-79@65.[189,1398,813,1666]" captionTargetPageId="65" captionText="Fig. 45. Cephalopods from the Olenidsletta Member, Floian, Ordovician, Profilstranda section, Ny Friesland, Spitsbergen. A–B. Nyfrieslandoceras bassleroceroides gen. et sp. nov., FMNH-P30353, holotype, from bed PO 131. A. Ventral view, prosiphuncular side. B. Lateral view with ventral, prosiphuncular side toward the left. C–D. Order, gen. et sp. indet. A, FMNH-P30354, from bed PO 131. C. Dorsal (?) view. D. Lateral view, with dorsal (?), antisiphuncular side toward the right. E–F. Estonioceratid gen. et sp. indet.A., FMNH-P30342, from bed PO 7.5. E. Lateral view with ventral, prosiphuncular side toward the right. F. adoral view with preserved siphuncular perforation. G. Order, gen. et sp. indet. B, FMNH-P30424, from bed 4.8., lateral view with ventral, prosiphuncular side toward the right. Scale bar = 10 mm for all figures." figureDoi="http://doi.org/10.5281/zenodo.5793560" httpUri="https://zenodo.org/record/5793560/files/figure.png" pageId="72" pageNumber="73">Fig. 45A– B</figureCitation>
|
||
). The conch is slightly curved with a marginal siphuncle on the convex side of the conch curvature. The preserved portion of the phragmocone has a height of
|
||
<quantity id="10159B5FFFE4FFE6FCB47D05FC3E784F" box="[866,992,529,555]" metricMagnitude="-2" metricUnit="m" metricValue="1.55" metricValueMax="1.8" metricValueMin="1.3" pageId="72" pageNumber="73" unit="mm" value="15.5" valueMax="18.0" valueMin="13.0">13–18 mm</quantity>
|
||
and a width of
|
||
<quantity id="10159B5FFFE4FFE6FB477D05FAD0784F" box="[1169,1294,529,555]" metricMagnitude="-2" metricUnit="m" metricValue="1.2" metricValueMax="1.3" metricValueMin="1.1" pageId="72" pageNumber="73" unit="mm" value="12.0" valueMax="13.0" valueMin="11.0">11–13 mm</quantity>
|
||
(9°angle of expansion of conch height). The body chamber is simple tubular,
|
||
<quantity id="10159B5FFFE4FFE6FC227D20FB97782A" box="[1012,1097,564,590]" metricMagnitude="-2" metricUnit="m" metricValue="3.0" pageId="72" pageNumber="73" unit="mm" value="30.0">30 mm</quantity>
|
||
long and has a height of
|
||
<quantity id="10159B5FFFE4FFE6FF697D43FE9E7816" box="[191,320,599,626]" metricMagnitude="-2" metricUnit="m" metricValue="1.9" metricValueMax="2.0" metricValueMin="1.8" pageId="72" pageNumber="73" unit="mm" value="19.0" valueMax="20.0" valueMin="18.0">18–20 mm</quantity>
|
||
and a width of
|
||
<quantity id="10159B5FFFE4FFE6FDD47D43FD5D7816" box="[514,643,599,626]" metricMagnitude="-2" metricUnit="m" metricValue="1.35" metricValueMax="1.4" metricValueMin="1.3" pageId="72" pageNumber="73" unit="mm" value="13.5" valueMax="14.0" valueMin="13.0">13–14 mm</quantity>
|
||
(4° angle of expansion of conch height). The body chamber is moderately compressed (with ratio conch width /conch height ca 0.7), but the more adapical parts of the fragment are less compressed (rW ≈ 0.85).
|
||
</paragraph>
|
||
<paragraph id="D75236BAFFE4FFE6FF6B7DCBFBE27979" blockId="72.[189,1398,735,797]" pageId="72" pageNumber="73">The conch surface is ornamented with prominent irregularly spaced growth lines which form a distinct hyponomic sinus on the convex, prosiphuncular side of the conch curvature.</paragraph>
|
||
<paragraph id="D75236BAFFE4FFE6FF6B7C57FDAA7E69" blockId="72.[189,1400,835,1038]" pageId="72" pageNumber="73">
|
||
The siphuncle is thin (rSD = ¹/16), nearly marginal, and slightly expanded within the chambers. The septal necks are thickened and very short orthochoanitic or achoanitic (
|
||
<figureCitation id="4FD62A3FFFE4FFE6FBD97C73FBAC79E5" box="[1039,1138,871,897]" captionStart="Fig" captionStartId="13.[189,232,1769,1795]" captionTargetBox="[201,1391,1387,1719]" captionTargetId="figure-363@13.[189,1398,1376,1731]" captionTargetPageId="13" captionText="Fig. 8. Reconstruction and interpretation of details of connecting ring and septal necks in cyrtoconic cephalopods from the Olenidsletta Member, Floian, Ordovician, Profilstranda section, Ny Friesland, Spitsbergen. A. Lawrenceoceras ebenus sp. nov., FMNH-P30335, holotype, see also Fig. 7B. B. Vallhalloceras floweri Evans & King, 1990, FMNH-P30340, see also Fig. 50B. C. Olenidslettoceras farmi gen. et sp. nov.,FMNH-P30334, holotype, see also Fig. 50A.D. Nyfrieslandoceras bassleroceroides gen. et sp. nov., FMNH-P30353, holotype, see also Fig. 49C. Black: septal neck and septum. Dark grey: connecting ring. Light grey: cameral deposits. Without scale." figureDoi="http://doi.org/10.5281/zenodo.5793444" httpUri="https://zenodo.org/record/5793444/files/figure.png" pageId="72" pageNumber="73">Figs 8D</figureCitation>
|
||
,
|
||
<figureCitation id="4FD62A3FFFE4FFE6FB567C73FB0679E5" box="[1152,1240,871,897]" captionStart="Fig" captionStartId="72.[191,234,1812,1838]" captionTargetBox="[189,1395,1303,1775]" captionTargetId="figure-317@72.[189,1398,1303,1775]" captionTargetPageId="72" captionText="Fig. 49. Median sections of phragmocones of cephalopods from the Olenidsletta Member, Floian, Ordovician, Profilstranda section, Ny Friesland, Spitsbergen. A. Order, gen. et sp. indet. B, FMNH-P30424, from bed 4.8, see also Fig. 11A for interpretation. B–C. Nyfrieslandoceras bassleroceroides gen. et sp. nov., FMNH-P30353, holotype, from bed PO 131. B. Detail with septa and siphuncle preserved, septa are crushed and taphonomically distorted. C. Detail of septal necks and connecting ring, see Fig. 8D for interpretation. Scale bars: A–B = 5 mm; C = 1 mm." figureDoi="http://doi.org/10.5281/zenodo.5793572" httpUri="https://zenodo.org/record/5793572/files/figure.png" pageId="72" pageNumber="73">49B–C</figureCitation>
|
||
). The sutures are obliquely transverse, form wide lateral lobes and bent forward on the convex side of the shell. Approximately nine chambers occur per length similar to the corresponding conch height at the base of the body chamber. The chamber length is
|
||
<quantity id="10159B5FFFE4FFE6FCC27CC4FC84798F" box="[788,858,976,1003]" metricMagnitude="-3" metricUnit="m" metricValue="2.0" pageId="72" pageNumber="73" unit="mm" value="2.0">2 mm</quantity>
|
||
at a conch height of
|
||
<quantity id="10159B5FFFE4FFE6FB8C7CC4FB6C798F" box="[1114,1202,976,1003]" metricMagnitude="-2" metricUnit="m" metricValue="1.8" pageId="72" pageNumber="73" unit="mm" value="18.0">18 mm</quantity>
|
||
. Cameral and/or endosiphuncular deposits not known.
|
||
</paragraph>
|
||
<paragraph id="D75236BAFFE4FFE6FF6B7B21FE867E2B" blockId="72.[189,344,1077,1103]" box="[189,344,1077,1103]" pageId="72" pageNumber="73">
|
||
<heading id="8C1A81D6FFE4FFE6FF6B7B21FE867E2B" bold="true" box="[189,344,1077,1103]" fontSize="11" level="3" pageId="72" pageNumber="73" reason="3">
|
||
<emphasis id="E599EAA8FFE4FFE6FF6B7B21FE867E2B" bold="true" box="[189,344,1077,1103]" pageId="72" pageNumber="73">Comparison</emphasis>
|
||
</heading>
|
||
</paragraph>
|
||
<paragraph id="D75236BAFFE4FFE7FF6B7B77FD747BE9" blockId="72.[188,1399,1123,1220]" lastBlockId="73.[189,1398,265,397]" lastPageId="73" lastPageNumber="74" pageId="72" pageNumber="73">
|
||
This species is externally similar to a slender
|
||
<taxonomicName id="10ED4D39FFE4FFE6FD117B77FB5C7E19" authority="Ulrich & Foerste, 1936" authorityName="Ulrich & Foerste" authorityYear="1936" box="[711,1154,1123,1150]" class="Cephalopoda" family="Bassleroceratidae" genus="Bassleroceras" higherTaxonomySource="GBIF" kingdom="Animalia" order="Tetrabranchia" pageId="72" pageNumber="73" phylum="Mollusca" rank="genus">
|
||
<emphasis id="E599EAA8FFE4FFE6FD117B77FCB27E19" box="[711,876,1123,1149]" italics="true" pageId="72" pageNumber="73">Bassleroceras</emphasis>
|
||
Ulrich & Foerste, 1936
|
||
</taxonomicName>
|
||
, but differs in having an expanded siphuncle with peculiar, very short or achoanitic, thickened septal necks, known otherwise only from
|
||
<emphasis id="E599EAA8FFE4FFE6FEE97BBEFDDB7EA0" box="[319,517,1194,1220]" italics="true" pageId="72" pageNumber="73">Richardsonceras</emphasis>
|
||
Foerste, 1933 and
|
||
<taxonomicName id="10ED4D39FFE4FFE6FD3B7BBEFBA67EA0" authority="Chen, 1987" authorityName="Chen" authorityYear="1987" box="[749,1144,1194,1220]" class="Cephalopoda" family="Oncoceratidae" genus="Richardsonoceroides" higherTaxonomySource="GBIF" kingdom="Animalia" order="Tetrabranchia" pageId="72" pageNumber="73" phylum="Mollusca" rank="genus">
|
||
<emphasis id="E599EAA8FFE4FFE6FD3B7BBEFC3A7EA0" box="[749,996,1194,1220]" italics="true" pageId="72" pageNumber="73">Richardsonoceroides</emphasis>
|
||
Chen, 1987
|
||
</taxonomicName>
|
||
. The former genus is strongly curved and has a contracted adult body chamber. The latter genus is less compressed, smaller and more curved.
|
||
<taxonomicName id="10ED4D39FFE5FFE7FE4C7E38FC9F7B22" authority="Kröger & Pohle, 2021" authorityName="Kröger & Pohle" authorityYear="2021" box="[410,833,300,326]" class="Cephalopoda" family="Rioceratidae" genus="Nyfrieslandoceras" higherTaxonomySource="GBIF" kingdom="Animalia" order="Tetrabranchia" pageId="73" pageNumber="74" phylum="Mollusca" rank="species" species="bassleroceroides" status="gen. et sp. nov.">
|
||
<emphasis id="E599EAA8FFE5FFE7FE4C7E38FC9F7B22" box="[410,833,300,326]" italics="true" pageId="73" pageNumber="74">Nyfrieslandoceras bassleroceroides</emphasis>
|
||
</taxonomicName>
|
||
<taxonomicNameLabel id="FEAA57D3FFE5FFE7FC9D7E39FBDA7B23" box="[843,1028,301,327]" pageId="73" pageNumber="74" rank="species">gen. et sp. nov.</taxonomicNameLabel>
|
||
can be conveniently classified within the
|
||
<taxonomicName id="10ED4D39FFE5FFE7FEEC7E5BFDF07B0D" authorityName="Evans & King" authorityYear="1990" box="[314,558,335,361]" class="Cephalopoda" family="Phthanoncoceratidae" higherTaxonomySource="GBIF" kingdom="Animalia" order="Tetrabranchia" pageId="73" pageNumber="74" phylum="Mollusca" rank="family">Phthanoncoceratidae</taxonomicName>
|
||
because of its combination of characteristic septal necks, nearly tubular siphuncle and exogastric conch curvature.
|
||
</paragraph>
|
||
</subSubSection>
|
||
</treatment>
|
||
</document> |