189 lines
25 KiB
XML
189 lines
25 KiB
XML
<document id="2C58FF615AB92957AFD43DF57BE94901" 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="5F4487ACFF80FF83FD497C31FD057B22" 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="Cyptendoceras undefined-b" docType="treatment" docVersion="12" lastPageNumber="45" masterDocId="A37DFFD4FFACFFAEFFD67F14FFDE7A64" masterDocTitle="Early-Middle Ordovician cephalopods from Ny Friesland, Spitsbergen - a pelagic fauna with Laurentian affinities" masterLastPageNumber="102" masterPageNumber="1" pageNumber="45" updateTime="1699472839061" 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="3D12C52DA2AFD3FF13706214962D9946">Early-Middle Ordovician cephalopods from Ny Friesland, Spitsbergen - a pelagic fauna with Laurentian affinities</mods:title>
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<mods:name id="08C0772637A5F11887113B31AC8C0AFC" type="personal">
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<mods:namePart id="FDFF58DCE8FE5AF91497C83293B42249">Kröger, Björn</mods:namePart>
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<mods:affiliation id="F73C396F6EE65ECE069B761953AC2FDF">Finnish Museum of Natural History, University of Helsinki, PO Box 44, FI- 00014 Helsinki, Finland.</mods:affiliation>
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<mods:nameIdentifier id="B55778C9DDA8E1A371A81528909ED75D" type="email">bjorn.kroger@helsinki.fi</mods:nameIdentifier>
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<mods:namePart id="78304107454FCE5C9231561C5D3C9B36">Pohle, Alexander</mods:namePart>
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<mods:affiliation id="DE78677FA64E9E1F8F81C69CC0384A2B">Paläontologisches Institut und Museum, University of Zurich, Zurich, Switzerland.</mods:affiliation>
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<mods:nameIdentifier id="692C548E42EC6211797D18ABAFB01961" type="email">alexander.pohle@pim.uzh.ch</mods:nameIdentifier>
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<mods:title id="7A1ACE89BCC401F44D2AD5DF33201F5B">European Journal of Taxonomy</mods:title>
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<mods:part id="D68D31D36FA484B8240FF4543DB30555">
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<mods:date id="A894E570DBBD2B24E2F1CF36AAB4FE10">2021</mods:date>
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<treatment id="5F4487ACFF80FF83FD497C31FD057B22" ID-DOI="http://doi.org/10.5281/zenodo.5795749" ID-GBIF-Taxon="191693660" ID-Zenodo-Dep="5795749" LSID="urn:lsid:plazi:treatment:5F4487ACFF80FF83FD497C31FD057B22" httpUri="http://treatment.plazi.org/id/5F4487ACFF80FF83FD497C31FD057B22" lastPageId="45" lastPageNumber="45" pageId="44" pageNumber="45">
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<subSubSection id="9FF76531FF80FF82FD497C31FC4B7924" box="[671,917,805,832]" pageId="44" pageNumber="45" type="nomenclature">
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<paragraph id="D75236BAFF80FF82FD497C31FC4B7924" blockId="44.[671,917,805,867]" box="[671,917,805,832]" pageId="44" pageNumber="45">
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<heading id="8C1A81D6FF80FF82FD497C31FC4B7924" box="[671,917,805,832]" centered="true" fontSize="11" level="2" pageId="44" pageNumber="45" reason="2">
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<taxonomicName id="10ED4D39FF80FF82FD497C31FC4B7924" box="[671,917,805,832]" class="Cephalopoda" family="Cyptendoceratidae" genus="Cyptendoceras" kingdom="Animalia" order="Tetrabranchia" pageId="44" pageNumber="45" phylum="Mollusca" rank="species" species="undefined-b">
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<emphasis id="E599EAA8FF80FF82FD497C31FC8F7924" bold="true" box="[671,849,805,832]" italics="true" pageId="44" pageNumber="45">Cyptendoceras</emphasis>
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sp. B
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</taxonomicName>
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</heading>
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</paragraph>
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</subSubSection>
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<subSubSection id="9FF76531FF80FF82FD127C5CFCB17907" box="[708,879,840,867]" pageId="44" pageNumber="45" type="description">
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<paragraph id="D75236BAFF80FF82FD127C5CFCB17907" blockId="44.[671,917,805,867]" box="[708,879,840,867]" pageId="44" pageNumber="45">
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<figureCitation id="4FD62A3FFF80FF82FD127C5CFCED7907" box="[708,819,840,867]" captionStart="Fig" captionStartId="22.[189,232,1536,1562]" captionTargetId="figure-11@21.[189,1398,272,2011]" captionTargetPageId="21" captionText="Fig. 12 (previous page). Apical parts of orthoconic cephalopods from the Olenidsletta Member, Floian, Ordovician, near Hinlopenstretet, Ny Friesland, Spitsbergen. A. Cyptendoceras sp. B., FMNH-P30472 from Profilbekken river basin, locality PR-phosphatic. Lateral view with siphuncle toward the left. B. Svalbardoceras sterna gen. et sp. nov, FMNH-P30169, from PO 7.5. Lateral view with siphuncle toward left. C, F–G. Eosomichelinoceras borealis sp. nov. C. Specimen FMNH-P30171, from bed PO 123.3. Lateral view with prosiphuncular side toward the right. D. Bactroceras fluvii sp. nov., FMNH-P30168, from Profilbekken river basin, locality PR-phosphatic, showing the ventral side with ventral sutural lobe. E, H, J. Bactroceras boliviensis Aubrechtová, 2015 from bed PO 131. E. Specimen FMNH-P30165, nearly dorsal view, showing the transition of the extreme apical part toward the juvenile part of the conch. F. Specimen FMNH-P30182, lateral view with siphuncle toward the right. G. Specimen FMNH-P30184, lateral view with siphuncle toward the left. H. Specimen FMNH-P30183, apical view, showing the smooth apical surface of the protoconch. I. Ethanoceras solitudines gen. et sp. nov., FMNH-P30173, from bed PO 123.3, note the fine transverse striation. J. FMNH-P30160, showing details of fine transverse ornamentation. Scale bar = 2 mm for all figures." figureDoi="http://doi.org/10.5281/zenodo.5794307" httpUri="https://zenodo.org/record/5794307/files/figure.png" pageId="44" pageNumber="45">Figs 12A</figureCitation>
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,
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<figureCitation id="4FD62A3FFF80FF82FCE97C5DFCB17907" box="[831,879,841,867]" captionStart="Fig" captionStartId="46.[189,232,1778,1804]" captionTargetBox="[189,1398,1171,1738]" captionTargetId="figure-232@46.[189,1398,1171,1738]" captionTargetPageId="46" captionText="Fig. 31. Median section of details of septal necks and siphuncle of cyptendoceratids from Olenidsletta Member, adjacent to Hinlopenstretet, Spitsbergen. A–B. Cyptendoceratid gen. et sp. indet., FMNH-P30431 from bed PO 131, Floian, Ordovician, Profilstranda section, Ny Friesland, Spitsbergen. Dorsal side directed toward left. A. General view of the siphuncle. Scale bar = 2 mm. B. Details of dorsal side of connecting ring. Scale bar = 1 mm. C. Cyptendoceras sp. B, FMNH-P30166 from Profilbekken river basin, locality PR-phosphatic, uppermost Olenidsletta Member, V3 trilobite zone, Dapingian. Scale bar = 5 mm." figureDoi="http://doi.org/10.5281/zenodo.5793520" httpUri="https://zenodo.org/record/5793520/files/figure.png" pageId="44" pageNumber="45">31C</figureCitation>
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</paragraph>
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</subSubSection>
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<subSubSection id="9FF76531FF80FF82FF6B7C9EFAA97992" pageId="44" pageNumber="45" type="materials_examined">
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<paragraph id="D75236BAFF80FF82FF6B7C9EFE7479C0" blockId="44.[189,426,906,932]" box="[189,426,906,932]" pageId="44" pageNumber="45">
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<heading id="8C1A81D6FF80FF82FF6B7C9EFE7479C0" bold="true" box="[189,426,906,932]" fontSize="11" level="3" pageId="44" pageNumber="45" reason="3">
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<emphasis id="E599EAA8FF80FF82FF6B7C9EFE7479C0" bold="true" box="[189,426,906,932]" pageId="44" pageNumber="45">Material examined</emphasis>
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</heading>
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||
</paragraph>
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<paragraph id="D75236BAFF80FF82FF6B7CACFAA97992" blockId="44.[189,1399,952,1014]" pageId="44" pageNumber="45">
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<materialsCitation id="67853CE7FF80FF82FF6B7CACFAAD7992" ID-GBIF-Occurrence="3421082340" location="from Profilbekken river basin" pageId="44" pageNumber="45" specimenCode="FMNH-P30166, FMNH-P30472" specimenCount="1">
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<specimenCount id="C1EBFD33FF80FF82FF6B7CACFEE279B6" box="[189,316,952,978]" pageId="44" pageNumber="45" type="generic">Specimens</specimenCount>
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<specimenCode id="874B9EC1FF80FF82FE957CACFE2579B6" box="[323,507,952,978]" pageId="44" pageNumber="45">FMNH-P30166</specimenCode>
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and
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<specimenCode id="874B9EC1FF80FF82FDE27CADFD2E79B7" box="[564,752,953,979]" pageId="44" pageNumber="45">FMNH-P30472</specimenCode>
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,
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<location id="D2326061FF80FF82FD2D7CACFB8679B6" LSID="urn:lsid:plazi:treatment:5F4487ACFF80FF83FD497C31FD057B22:D2326061FF80FF82FD2D7CACFB8679B6" box="[763,1112,952,978]" name="from Profilbekken river basin" pageId="44" pageNumber="45">from Profilbekken river basin</location>
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,
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<location id="D2326061FF80FF82FBB57CACFAAC79B6" LSID="urn:lsid:plazi:treatment:5F4487ACFF80FF83FD497C31FD057B22:D2326061FF80FF82FBB57CACFAAC79B6" box="[1123,1394,952,978]" name="locality PR-phosphatic" pageId="44" pageNumber="45">locality PR-phosphatic</location>
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,
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<locationDeviation id="C6E02F98FF80FF82FF6B7CC8FE247992" box="[189,506,988,1014]" pageId="44" pageNumber="45">adjacent to Hinlopenstretet</locationDeviation>
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,
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<location id="D2326061FF80FF82FDD37CC8FD4C7992" LSID="urn:lsid:plazi:treatment:5F4487ACFF80FF83FD497C31FD057B22:D2326061FF80FF82FDD37CC8FD4C7992" box="[517,658,988,1014]" name="Spitsbergen" pageId="44" pageNumber="45">Spitsbergen</location>
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, uppermost
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<location id="D2326061FF80FF82FCC97CC8FBC67992" LSID="urn:lsid:plazi:treatment:5F4487ACFF80FF83FD497C31FD057B22:D2326061FF80FF82FCC97CC8FBC67992" box="[799,1048,988,1014]" name="Olenidsletta Member" pageId="44" pageNumber="45">Olenidsletta Member</location>
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,
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<location id="D2326061FF80FF82FBF47CC8FB347992" LSID="urn:lsid:plazi:treatment:5F4487ACFF80FF83FD497C31FD057B22:D2326061FF80FF82FBF47CC8FB347992" box="[1058,1258,988,1014]" name="V 3 trilobite zone" pageId="44" pageNumber="45">
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<date id="A353107AFF80FF82FBF47CC8FB987992" box="[1058,1094,988,1014]" pageId="44" pageNumber="45">V3</date>
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trilobite zone
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</location>
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,
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<location id="D2326061FF80FF82FB237CC8FAAD7992" LSID="urn:lsid:plazi:treatment:5F4487ACFF80FF83FD497C31FD057B22:D2326061FF80FF82FB237CC8FAAD7992" box="[1269,1395,988,1014]" name="Dapingian" pageId="44" pageNumber="45">Dapingian</location>
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</materialsCitation>
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.
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</paragraph>
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</subSubSection>
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<subSubSection id="9FF76531FF80FF82FF6B7B09FD3D7CF0" pageId="44" pageNumber="45" type="description">
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<paragraph id="D75236BAFF80FF82FF6B7B09FE907E53" blockId="44.[189,334,1053,1079]" box="[189,334,1053,1079]" pageId="44" pageNumber="45">
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<heading id="8C1A81D6FF80FF82FF6B7B09FE907E53" bold="true" box="[189,334,1053,1079]" fontSize="11" level="3" pageId="44" pageNumber="45" reason="3">
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<emphasis id="E599EAA8FF80FF82FF6B7B09FE907E53" bold="true" box="[189,334,1053,1079]" pageId="44" pageNumber="45">Description</emphasis>
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</heading>
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</paragraph>
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<paragraph id="D75236BAFF80FF82FF6B7B5FFB2E7F38" blockId="44.[188,1400,1099,1373]" pageId="44" pageNumber="45">
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The larger specimen, FMNH-P30166, is a fragment of a phragmocone with smooth shell, a circular or slightly compressed conch cross section with diameters
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<quantity id="10159B5FFF80FF82FCB77B7BFC3D7EED" box="[865,995,1135,1161]" metricMagnitude="-2" metricUnit="m" metricValue="3.45" metricValueMax="3.8" metricValueMin="3.1" pageId="44" pageNumber="45" unit="mm" value="34.5" valueMax="38.0" valueMin="31.0">31–38 mm</quantity>
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and a length of
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<quantity id="10159B5FFF80FF82FB7B7B7BFADC7EED" box="[1197,1282,1135,1161]" metricMagnitude="-2" metricUnit="m" metricValue="8.2" pageId="44" pageNumber="45" unit="mm" value="82.0">82 mm</quantity>
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(angle of expansion ca 5°). The siphuncle is marginally positioned, is subcircular or slightly depressed in cross section with a height of
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<quantity id="10159B5FFF80FF82FE057BA1FDE27EB4" box="[467,572,1205,1232]" metricMagnitude="-2" metricUnit="m" metricValue="1.15" pageId="44" pageNumber="45" unit="mm" value="11.5">11.5 mm</quantity>
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, where the conch height is
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<quantity id="10159B5FFF80FF82FCA57BA1FC1A7EB4" box="[883,964,1205,1232]" metricMagnitude="-2" metricUnit="m" metricValue="3.6" pageId="44" pageNumber="45" unit="mm" value="36.0">36 mm</quantity>
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(rSD = 0.32). The septa are imploded and crushed. Where visible they are
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<quantity id="10159B5FFF80FF82FD897BCCFD7F7E97" box="[607,673,1240,1267]" metricMagnitude="-3" metricUnit="m" metricValue="5.0" pageId="44" pageNumber="45" unit="mm" value="5.0">5 mm</quantity>
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apart at a conch height of
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<quantity id="10159B5FFF80FF82FC067BCCFBFF7E97" box="[976,1057,1240,1267]" metricMagnitude="-2" metricUnit="m" metricValue="3.4" pageId="44" pageNumber="45" unit="mm" value="34.0">34 mm</quantity>
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(rCL = 0.15) with the sutures forming a distinct ventral lobe. The septal necks are loxochoanitic with a length of
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<quantity id="10159B5FFF80FF82FB417BE8FAF87F72" box="[1175,1318,1276,1302]" metricMagnitude="-3" metricUnit="m" metricValue="1.45" metricValueMax="1.7" metricValueMin="1.2" pageId="44" pageNumber="45" unit="mm" value="1.45" valueMax="1.7" valueMin="1.2">1.2–1.7 mm</quantity>
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||
where the siphuncular segment is
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<quantity id="10159B5FFF80FF82FDD27A0BFD947F5D" box="[516,586,1311,1338]" metricMagnitude="-3" metricUnit="m" metricValue="5.0" pageId="44" pageNumber="45" unit="mm" value="5.0">5 mm</quantity>
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long (0.24–0.34 of chamber length). The connecting ring is slightly concave and poorly preserved, making an estimation of its thickness impossible (
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<figureCitation id="4FD62A3FFF80FF82FBA17A56FB3C7F38" box="[1143,1250,1346,1372]" captionStart="Fig" captionStartId="46.[189,232,1778,1804]" captionTargetBox="[189,1398,1171,1738]" captionTargetId="figure-232@46.[189,1398,1171,1738]" captionTargetPageId="46" captionText="Fig. 31. Median section of details of septal necks and siphuncle of cyptendoceratids from Olenidsletta Member, adjacent to Hinlopenstretet, Spitsbergen. A–B. Cyptendoceratid gen. et sp. indet., FMNH-P30431 from bed PO 131, Floian, Ordovician, Profilstranda section, Ny Friesland, Spitsbergen. Dorsal side directed toward left. A. General view of the siphuncle. Scale bar = 2 mm. B. Details of dorsal side of connecting ring. Scale bar = 1 mm. C. Cyptendoceras sp. B, FMNH-P30166 from Profilbekken river basin, locality PR-phosphatic, uppermost Olenidsletta Member, V3 trilobite zone, Dapingian. Scale bar = 5 mm." figureDoi="http://doi.org/10.5281/zenodo.5793520" httpUri="https://zenodo.org/record/5793520/files/figure.png" pageId="44" pageNumber="45">Fig. 31C</figureCitation>
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).
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</paragraph>
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<paragraph id="D75236BAFF80FF82FF6B7A97FD3D7CF0" blockId="44.[189,1401,1411,1684]" pageId="44" pageNumber="45">
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The second specimen, FMNH-P30472 (
|
||
<figureCitation id="4FD62A3FFF80FF82FD4C7A97FCD77FFA" box="[666,777,1411,1438]" captionStart="Fig" captionStartId="22.[189,232,1536,1562]" captionTargetId="figure-11@21.[189,1398,272,2011]" captionTargetPageId="21" captionText="Fig. 12 (previous page). Apical parts of orthoconic cephalopods from the Olenidsletta Member, Floian, Ordovician, near Hinlopenstretet, Ny Friesland, Spitsbergen. A. Cyptendoceras sp. B., FMNH-P30472 from Profilbekken river basin, locality PR-phosphatic. Lateral view with siphuncle toward the left. B. Svalbardoceras sterna gen. et sp. nov, FMNH-P30169, from PO 7.5. Lateral view with siphuncle toward left. C, F–G. Eosomichelinoceras borealis sp. nov. C. Specimen FMNH-P30171, from bed PO 123.3. Lateral view with prosiphuncular side toward the right. D. Bactroceras fluvii sp. nov., FMNH-P30168, from Profilbekken river basin, locality PR-phosphatic, showing the ventral side with ventral sutural lobe. E, H, J. Bactroceras boliviensis Aubrechtová, 2015 from bed PO 131. E. Specimen FMNH-P30165, nearly dorsal view, showing the transition of the extreme apical part toward the juvenile part of the conch. F. Specimen FMNH-P30182, lateral view with siphuncle toward the right. G. Specimen FMNH-P30184, lateral view with siphuncle toward the left. H. Specimen FMNH-P30183, apical view, showing the smooth apical surface of the protoconch. I. Ethanoceras solitudines gen. et sp. nov., FMNH-P30173, from bed PO 123.3, note the fine transverse striation. J. FMNH-P30160, showing details of fine transverse ornamentation. Scale bar = 2 mm for all figures." figureDoi="http://doi.org/10.5281/zenodo.5794307" httpUri="https://zenodo.org/record/5794307/files/figure.png" pageId="44" pageNumber="45">Fig. 12A</figureCitation>
|
||
), is a
|
||
<quantity id="10159B5FFF80FF82FC827A90FC777FFA" box="[852,937,1412,1438]" metricMagnitude="-2" metricUnit="m" metricValue="2.0" pageId="44" pageNumber="45" unit="mm" value="20.0">20 mm</quantity>
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||
long apical portion of a phragmocone with a smooth outer surface and a slightly compressed conch cross section. This fragment is slightly curved with the siphuncle marginally positioned at the concave side of conch curvature. The siphuncle is empty and apparently circular in cross section, with a diameter of
|
||
<quantity id="10159B5FFF80FF82FC317AF9FB9F7C6C" box="[999,1089,1517,1544]" metricMagnitude="-3" metricUnit="m" metricValue="1.4" pageId="44" pageNumber="45" unit="mm" value="1.4">1.4 mm</quantity>
|
||
where the conch height is
|
||
<quantity id="10159B5FFF80FF82FF687904FED87C4F" box="[190,262,1552,1579]" metricMagnitude="-3" metricUnit="m" metricValue="4.0" pageId="44" pageNumber="45" unit="mm" value="4.0">4 mm</quantity>
|
||
. The extreme apex is cup-shaped without constriction and grows from its extreme tip toward a conch height of
|
||
<quantity id="10159B5FFF80FF82FEAA7920FE087C2A" box="[380,470,1588,1614]" metricMagnitude="-3" metricUnit="m" metricValue="1.3" pageId="44" pageNumber="45" unit="mm" value="1.3">1.3 mm</quantity>
|
||
within the apical
|
||
<quantity id="10159B5FFF80FF82FD717920FD337C2A" box="[679,749,1588,1614]" metricMagnitude="-3" metricUnit="m" metricValue="1.0" pageId="44" pageNumber="45" unit="mm" value="1.0">1 mm</quantity>
|
||
; at a distance of
|
||
<quantity id="10159B5FFF80FF82FC667920FC2A7C2A" box="[944,1012,1588,1614]" metricMagnitude="-3" metricUnit="m" metricValue="2.0" pageId="44" pageNumber="45" unit="mm" value="2.0">2 mm</quantity>
|
||
from the tip the conch is
|
||
<quantity id="10159B5FFF80FF82FAC97920FAA77C2A" box="[1311,1401,1588,1614]" metricMagnitude="-3" metricUnit="m" metricValue="1.7" pageId="44" pageNumber="45" unit="mm" value="1.7">1.7 mm</quantity>
|
||
high, at a distance of
|
||
<quantity id="10159B5FFF80FF82FE607942FE247C15" box="[438,506,1622,1649]" metricMagnitude="-3" metricUnit="m" metricValue="5.0" pageId="44" pageNumber="45" unit="mm" value="5.0">5 mm</quantity>
|
||
the conch height is
|
||
<quantity id="10159B5FFF80FF82FD327943FC9F7C15" box="[740,833,1623,1649]" metricMagnitude="-3" metricUnit="m" metricValue="2.3" pageId="44" pageNumber="45" unit="mm" value="2.3">2.3 mm</quantity>
|
||
. The angle of expansion between
|
||
<quantity id="10159B5FFF80FF82FB1B7943FACE7C15" box="[1229,1296,1623,1649]" metricMagnitude="-3" metricUnit="m" metricValue="1.0" pageId="44" pageNumber="45" unit="mm" value="1.0">1 mm</quantity>
|
||
from tip toward the adoral end of the specimen is ca 7°.
|
||
</paragraph>
|
||
</subSubSection>
|
||
<subSubSection id="9FF76531FF80FF83FF6B79AFFD057B22" lastPageId="45" lastPageNumber="46" pageId="44" pageNumber="45" type="discussion">
|
||
<paragraph id="D75236BAFF80FF82FF6B79AFFEF17CB1" blockId="44.[189,303,1723,1749]" box="[189,303,1723,1749]" pageId="44" pageNumber="45">
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||
<heading id="8C1A81D6FF80FF82FF6B79AFFEF17CB1" bold="true" box="[189,303,1723,1749]" fontSize="11" level="3" pageId="44" pageNumber="45" reason="3">
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||
<emphasis id="E599EAA8FF80FF82FF6B79AFFEF17CB1" bold="true" box="[189,303,1723,1749]" pageId="44" pageNumber="45">Remarks</emphasis>
|
||
</heading>
|
||
</paragraph>
|
||
<paragraph id="D75236BAFF80FF83FF6B79FEFD057B22" blockId="44.[189,1400,1770,1972]" lastBlockId="45.[188,1398,265,327]" lastPageId="45" lastPageNumber="46" pageId="44" pageNumber="45">
|
||
These specimens are assigned to
|
||
<taxonomicName id="10ED4D39FF80FF82FD8A79FEFCD27D60" authorityName="Ulrich & Foerste" authorityYear="1936" box="[604,780,1770,1796]" class="Cephalopoda" family="Cyptendoceratidae" genus="Cyptendoceras" higherTaxonomySource="GBIF" kingdom="Animalia" order="Tetrabranchia" pageId="44" pageNumber="45" phylum="Mollusca" rank="genus">
|
||
<emphasis id="E599EAA8FF80FF82FD8A79FEFCD27D60" box="[604,780,1770,1796]" italics="true" pageId="44" pageNumber="45">Cyptendoceras</emphasis>
|
||
</taxonomicName>
|
||
because they combine a relatively wide marginal siphuncle and (in the larger specimen) concave segments, loxochoanitic septal necks and a ventral sutural lobe, although the preserved parts of the siphuncle are empty. Most species of
|
||
<taxonomicName id="10ED4D39FF80FF82FB1E7824FAA67D2E" authorityName="Ulrich & Foerste" authorityYear="1936" box="[1224,1400,1840,1866]" class="Cephalopoda" family="Cyptendoceratidae" genus="Cyptendoceras" higherTaxonomySource="GBIF" kingdom="Animalia" order="Tetrabranchia" pageId="44" pageNumber="45" phylum="Mollusca" rank="genus">
|
||
<emphasis id="E599EAA8FF80FF82FB1E7824FAA67D2E" box="[1224,1400,1840,1866]" italics="true" pageId="44" pageNumber="45">Cyptendoceras</emphasis>
|
||
</taxonomicName>
|
||
have a narrower chamber spacing and a slightly depressed cross section. In
|
||
<taxonomicName id="10ED4D39FF80FF82FBE87840FE257DF5" authority="Ulrich, Foerste, Miller & Unklesbay, 1944" authorityName="Ulrich, Foerste, Miller & Unklesbay" authorityYear="1944" class="Cephalopoda" family="Cyptendoceratidae" genus="Cyptendoceras" higherTaxonomySource="GBIF" kingdom="Animalia" order="Tetrabranchia" pageId="44" pageNumber="45" phylum="Mollusca" rank="species" species="mesleri">
|
||
<emphasis id="E599EAA8FF80FF82FBE87840FB697D09" box="[1086,1207,1875,1902]" italics="true" pageId="44" pageNumber="45">C. mesleri</emphasis>
|
||
<bibRefCitation id="B37C4B4BFF80FF82FB687847FE257DF5" author="Ulrich E. O. & Foerste A. F. & Miller A. K. & Unklesbay A. G." pageId="44" pageNumber="45" pagination="1 - 226" refId="ref50494" refString="Ulrich E. O., Foerste A. F., Miller A. K. & Unklesbay A. G. 1944. Ozarkian and Canadian cephalopods. Part III: Longicones and summary. Geological Society of America Special Papers 58: 1 - 226. https: // doi. org / 10.1130 / SPE 58" type="journal article" year="1944">Ulrich, Foerste, Miller & Unklesbay, 1944</bibRefCitation>
|
||
</taxonomicName>
|
||
only five chambers occur in a distance similar to conch height, which is comparable to the rCL of specimen FMNH-P30166. However, neither
|
||
<taxonomicName id="10ED4D39FF80FF82FBC0788EFB4C7DD0" authorityName="Ulrich, Foerste, Miller & Unklesbay" authorityYear="1944" box="[1046,1170,1946,1972]" class="Cephalopoda" family="Cyptendoceratidae" genus="Cyptendoceras" higherTaxonomySource="GBIF" kingdom="Animalia" order="Tetrabranchia" pageId="44" pageNumber="45" phylum="Mollusca" rank="species" species="mesleri">
|
||
<emphasis id="E599EAA8FF80FF82FBC0788EFB4C7DD0" box="[1046,1170,1946,1972]" italics="true" pageId="44" pageNumber="45">C. mesleri</emphasis>
|
||
</taxonomicName>
|
||
nor the specimens described above allow for detailed comparison and the fragmentary character of the available specimens do not allow for a species level determination.
|
||
</paragraph>
|
||
</subSubSection>
|
||
</treatment>
|
||
</document> |