170 lines
25 KiB
XML
170 lines
25 KiB
XML
<document id="B4BCC043620D55089D4DF7A1897E14BE" ID-DOI="10.5281/zenodo.13388390" ID-ISSN="1732-2421" ID-Zenodo-Dep="13388390" IM.bibliography_approvedBy="felipe" IM.illustrations_approvedBy="felipe" IM.materialsCitations_approvedBy="felipe" IM.metadata_approvedBy="karina" IM.tables_approvedBy="karina" IM.taxonomicNames_approvedBy="felipe" IM.treatmentCitations_approvedBy="felipe" IM.treatments_approvedBy="karina" checkinTime="1723061700584" checkinUser="felipe" docAuthor="Wilmsen, Markus & Yazykova, Elena A." docDate="2003" docId="245C87D88760FFEE3D1FD291FAC22D69" docLanguage="en" docName="ActaPalaeontolPol.48.3.481-490.pdf" docOrigin="Acta Palaeontologica Polonica 48 (3)" docStyle="DocumentStyle:93F5927C23D90727DE855278A6F17B37.1:ActaPalaeontolPol.2002-2009.journal_article" docStyleId="93F5927C23D90727DE855278A6F17B37" docStyleName="ActaPalaeontolPol.2002-2009.journal_article" docStyleVersion="1" docTitle="Cymatoceras bifidum Shimansky 1975" docType="treatment" docVersion="3" lastPageNumber="487" masterDocId="D865FFA08766FFE83D79D17DFF842940" masterDocTitle="Campanian (Late Cretaceous) nautiloids from Sakhalin, Far East Russia" masterLastPageNumber="490" masterPageNumber="481" pageNumber="487" updateTime="1724875119553" updateUser="ExternalLinkService" zenodo-license-document="CC-BY-4.0">
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<mods:title id="878F0DA8B0E156090E6ACD6C5CFC5126">Campanian (Late Cretaceous) nautiloids from Sakhalin, Far East Russia</mods:title>
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<mods:name id="B6674752565A9DDAB6E39F5E8633B838" type="personal">
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<mods:namePart id="91D4C1AA9134E1CB09CDD1E04B4D069F">Wilmsen, Markus</mods:namePart>
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<mods:namePart id="D0B86617E63D9BA26F85BC03F584FB34">Yazykova, Elena A.</mods:namePart>
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<mods:typeOfResource id="6D81BF08716D4050B5747705F5EE4F1C">text</mods:typeOfResource>
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<mods:title id="9EAD985E7482D1BEAE076ADAFB11EFCA">Acta Palaeontologica Polonica</mods:title>
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<mods:part id="2AD34A2C74F4E5C611D6F2AAF54220A8">
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<mods:date id="B60B2216EF1733EBE58CA4DC933D4487">2003</mods:date>
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<mods:number id="0970A412FE523C1197BD196DE176F8DE">2003-09-30</mods:number>
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<mods:number id="B39038FD83D46BA56BC76C935C31B275">48</mods:number>
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<mods:identifier id="BF3785B9995B34CB06D3355778DFCF0C" type="DOI">10.5281/zenodo.13388390</mods:identifier>
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<mods:identifier id="181245EFC17D24399E927BEAAC3C512F" type="ISSN">1732-2421</mods:identifier>
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<mods:identifier id="B56FCB98CCB72167F816B107876B0D5D" type="Zenodo-Dep">13388390</mods:identifier>
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<treatment id="245C87D88760FFEE3D1FD291FAC22D69" LSID="urn:lsid:plazi:treatment:245C87D88760FFEE3D1FD291FAC22D69" httpUri="http://treatment.plazi.org/id/245C87D88760FFEE3D1FD291FAC22D69" lastPageNumber="487" pageId="6" pageNumber="487">
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<subSubSection id="E4EF65458760FFEE3D1FD291FD032D49" box="[102,647,1004,1033]" pageId="6" pageNumber="487" type="nomenclature">
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<paragraph id="AC4A36CE8760FFEE3D1FD291FD032D49" blockId="6.[102,647,1004,1066]" box="[102,647,1004,1033]" pageId="6" pageNumber="487">
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<heading id="F70281A28760FFEE3D1FD291FD032D49" box="[102,647,1004,1033]" fontSize="12" level="2" pageId="6" pageNumber="487" reason="9">
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<taxonomicName id="6BF54D4D8760FFEE3D1FD291FD032D49" authority="Shimansky, 1975" authorityName="Shimansky" authorityYear="1975" box="[102,647,1004,1033]" class="Cephalopoda" family="Cymatoceratidae" genus="Cymatoceras" higherTaxonomySource="GBIF" isUncertain="true" kingdom="Animalia" order="Nautilida" pageId="6" pageNumber="487" phylum="Mollusca" rank="species" species="bifidum">
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<emphasis id="9E81EADC8760FFEE3D1FD291FE8B2D49" box="[102,271,1004,1033]" italics="true" pageId="6" pageNumber="487">Cymatoceras</emphasis>
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cf.
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<emphasis id="9E81EADC8760FFEE3C39D291FE262D49" box="[320,418,1004,1033]" italics="true" pageId="6" pageNumber="487">bifidum</emphasis>
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<bibRefCitation id="C8644B3F8760FFEE3CD0D291FD032D49" author="Shimansky, V. N. & Simanskij, V. N." box="[425,647,1004,1033]" pageId="6" pageNumber="487" pagination="1 - 208" refId="ref5759" refString="Shimansky, V. N. [Simanskij, V. N.] 1975. Cretaceousnautiloids [inRussian]. Trudy Paleontologiceskogo Instituta Akademii Nauk SSSR 150: 1 - 208." type="journal article" year="1975">Shimansky, 1975</bibRefCitation>
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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="E4EF65458760FFEE3D1FD569FAC22D69" pageId="6" pageNumber="487" type="description">
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<paragraph id="AC4A36CE8760FFEE3D1FD569FF302D6A" blockId="6.[102,647,1004,1066]" box="[102,180,1044,1066]" pageId="6" pageNumber="487">
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<figureCitation id="34CE2A4B8760FFEE3D1FD569FF342D6A" box="[102,176,1044,1066]" captionStart="Fig" captionStartId="5.[102,135,1485,1504]" captionTargetBox="[267,1293,229,1453]" captionTargetId="figure-190@5.[262,1326,225,1457]" captionTargetPageId="5" captionText="Fig. 6. A. Cymatoceras pseudoatlas (Yabe and Shimizu, 1924b). PIW2002IV−2 from the Krasnoyarka Formation, Member 2, locality 12 (Canadoceras multicostatum Zone, Upper Campanian), Naiba River valley, Sakhalin; apertural view [see also Fig. 5B]. B. Cymatoceras cf. bifidum Shimansky, 1975. PIW2002IV−4 from the Krasnoyarka Formation, Member 1 (Pachydiscus (P.) aff. egertoni Zone, Upper Campanian), locality 0.6, Naiba River valley, Sakhalin; in lateral (B1, B3) and ventral (B2) views. Scale bar in the middle is for A, B1, and B3. Scale bars 2 cm." figureDoi="http://doi.org/10.5281/zenodo.13388403" httpUri="https://zenodo.org/record/13388403/files/figure.png" pageId="6" pageNumber="487">Fig. 6B</figureCitation>
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.
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</paragraph>
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<paragraph id="AC4A36CE8760FFEE3D1FD546FD172D11" blockId="6.[102,659,1083,1105]" box="[102,659,1083,1105]" pageId="6" pageNumber="487">
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cf.
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<taxonomicName id="6BF54D4D8760FFEE3DFDD546FDB72D11" authority="Shimansky, 1975: 108" authorityName="Shimansky" authorityPageNumber="108" authorityYear="1975" box="[132,563,1083,1105]" class="Cephalopoda" family="Cymatoceratidae" genus="Cymatoceras" higherTaxonomySource="GBIF" kingdom="Animalia" order="Nautilida" pageId="6" pageNumber="487" phylum="Mollusca" rank="species" species="bifidum">
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<emphasis id="9E81EADC8760FFEE3DFDD546FED62D11" box="[132,338,1083,1105]" italics="true" pageId="6" pageNumber="487">Cymatoceras bifidum</emphasis>
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<bibRefCitation id="C8644B3F8760FFEE3C20D546FDB72D11" author="Shimansky, V. N. & Simanskij, V. N." box="[345,563,1083,1105]" pageId="6" pageNumber="487" pagination="1 - 208" refId="ref5759" refString="Shimansky, V. N. [Simanskij, V. N.] 1975. Cretaceousnautiloids [inRussian]. Trudy Paleontologiceskogo Instituta Akademii Nauk SSSR 150: 1 - 208." type="journal article" year="1975">Shimansky, 1975: 108</bibRefCitation>
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</taxonomicName>
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, pl. 23: 1.
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</paragraph>
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<paragraph id="AC4A36CE8760FFEE3D1FD51CFEF42DF9" blockId="6.[102,774,1121,1209]" pageId="6" pageNumber="487">
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<emphasis id="9E81EADC8760FFEE3D1FD51CFF4C2D39" box="[102,200,1121,1145]" italics="true" pageId="6" pageNumber="487">Material</emphasis>
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.—
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<materialsCitation id="1C9D3C938760FFEE3D93D51CFEE82DF9" collectingDate="2002-04-04" location="Naiba River valley" pageId="6" pageNumber="487" specimenCount="1" stateProvince="Sakhalin">
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A single deformed specimen with shell preserved (no. PIW
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<date id="D84B100E8760FFEE3C5FD5FCFE102DD9" box="[294,404,1153,1177]" pageId="6" pageNumber="487" value="2002-04-04">
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<collectingDate id="C80FE9E68760FFEE3C5FD5FCFE102DD9" box="[294,404,1153,1177]" pageId="6" pageNumber="487" value="2002-04-04">2002IV−4</collectingDate>
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</date>
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from locality 0.6 in the
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<location id="A92A60158760FFEE3FBAD5FCFF762DF9" LSID="urn:lsid:plazi:treatment:245C87D88760FFEE3D1FD291FAC22D69:A92A60158760FFEE3FBAD5FCFF762DF9" name="Naiba River valley" pageId="6" pageNumber="487" stateProvince="Sakhalin">Naiba River valley</location>
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,
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<collectingRegion id="6E31F82C8760FFEE3D84D5DCFEE02DF9" box="[253,356,1185,1209]" country="Russia" name="Sakhalin" pageId="6" pageNumber="487">Sakhalin</collectingRegion>
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)
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</materialsCitation>
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.
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</paragraph>
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<paragraph id="AC4A36CE8760FFEE3D1FD5B7FEF82E41" blockId="6.[102,775,1225,1793]" pageId="6" pageNumber="487">
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<emphasis id="9E81EADC8760FFEE3D1FD5B7FF6E2DA1" box="[102,234,1226,1249]" italics="true" pageId="6" pageNumber="487">Description</emphasis>
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. —Involute nautiloid with broadly rounded venter. The umbilical shoulder is rounded, grading into a steeply inclined to overhanging umbilical wall. The funnel−likeumbilicusisnarrowbutnotoccluded(
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<figureCitation id="34CE2A4B8760FFEE3F17D454FD3D2C01" box="[622,697,1321,1345]" captionStart="Fig" captionStartId="5.[102,135,1485,1504]" captionTargetBox="[267,1293,229,1453]" captionTargetId="figure-190@5.[262,1326,225,1457]" captionTargetPageId="5" captionText="Fig. 6. A. Cymatoceras pseudoatlas (Yabe and Shimizu, 1924b). PIW2002IV−2 from the Krasnoyarka Formation, Member 2, locality 12 (Canadoceras multicostatum Zone, Upper Campanian), Naiba River valley, Sakhalin; apertural view [see also Fig. 5B]. B. Cymatoceras cf. bifidum Shimansky, 1975. PIW2002IV−4 from the Krasnoyarka Formation, Member 1 (Pachydiscus (P.) aff. egertoni Zone, Upper Campanian), locality 0.6, Naiba River valley, Sakhalin; in lateral (B1, B3) and ventral (B2) views. Scale bar in the middle is for A, B1, and B3. Scale bars 2 cm." figureDoi="http://doi.org/10.5281/zenodo.13388403" httpUri="https://zenodo.org/record/13388403/files/figure.png" pageId="6" pageNumber="487">Fig.6B</figureCitation>
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<figureCitation id="34CE2A4B8760FFEE3FC1D449FD452C05" box="[696,705,1332,1349]" captionStart="Fig" captionStartId="3.[102,135,866,885]" captionTargetBox="[259,1328,225,833]" captionTargetId="figure-299@3.[259,1328,225,838]" captionTargetPageId="3" captionText="Fig. 3. Synoptic ammonite and inoceramid bivalve biostratigraphy of the areas discussed in the text (compiled after Zonova et al. 1993; Toshimitsu et al. 1995; Shigeta et al. 1999; Yazykova 2002; Yazykova et al. 2002). Abbreviation: Sant., Santorians." figureDoi="http://doi.org/10.5281/zenodo.13388396" httpUri="https://zenodo.org/record/13388396/files/figure.png" pageId="6" pageNumber="487">
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<subScript id="3071348B8760FFEE3FC1D449FD452C05" attach="left" box="[696,705,1332,1349]" fontSize="7" pageId="6" pageNumber="487">3</subScript>
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</figureCitation>
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).Due to lateral compaction, only maximum diameter (~
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<quantity id="6B0D9B2B8760FFEE3FEED434FD7F2C22" box="[663,763,1353,1378]" metricMagnitude="-1" metricUnit="m" metricValue="1.5699999999999998" pageId="6" pageNumber="487" unit="mm" value="157.0">157 mm</quantity>
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), whorl height (~
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<quantity id="6B0D9B2B8760FFEE3C61D414FEEA2CC2" box="[280,366,1385,1410]" metricMagnitude="-2" metricUnit="m" metricValue="9.0" pageId="6" pageNumber="487" unit="mm" value="90.0">90 mm</quantity>
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) and umbilical diameter (~
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<quantity id="6B0D9B2B8760FFEE3FD0D414FD7B2CC2" box="[681,767,1385,1410]" metricMagnitude="-2" metricUnit="m" metricValue="2.0" pageId="6" pageNumber="487" unit="mm" value="20.0">20 mm</quantity>
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) could be measured (Wh/D = 0.57; U/D = 0.13). Maximum breadth of whorl seems to be in the lower part of the flanks. The flank is covered by band−like ribs which broaden up to mid−flank, reaching a width of up to
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<quantity id="6B0D9B2B8760FFEE3F67D494FDF02F41" box="[542,628,1513,1537]" metricMagnitude="-2" metricUnit="m" metricValue="1.2" pageId="6" pageNumber="487" unit="mm" value="12.0">12 mm</quantity>
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. Intercalated groovesare2–4mmwide.Bifurcationsorintercalatoriesappear on the outer flanks and on the ventrolateral shoulders ratherirregularly.Ontheventer,theribsareregularlyspaced and approximately
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<quantity id="6B0D9B2B8760FFEE3C47D714FE1F2FC1" box="[318,411,1641,1665]" metricMagnitude="-3" metricUnit="m" metricValue="6.0" metricValueMax="7.0" metricValueMin="5.0" pageId="6" pageNumber="487" unit="mm" value="6.0" valueMax="7.0" valueMin="5.0">5–7 mm</quantity>
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wide (
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<figureCitation id="34CE2A4B8760FFEE3C91D714FDB92FC1" box="[488,573,1641,1665]" captionStart="Fig" captionStartId="5.[102,135,1485,1504]" captionTargetBox="[267,1293,229,1453]" captionTargetId="figure-190@5.[262,1326,225,1457]" captionTargetPageId="5" captionText="Fig. 6. A. Cymatoceras pseudoatlas (Yabe and Shimizu, 1924b). PIW2002IV−2 from the Krasnoyarka Formation, Member 2, locality 12 (Canadoceras multicostatum Zone, Upper Campanian), Naiba River valley, Sakhalin; apertural view [see also Fig. 5B]. B. Cymatoceras cf. bifidum Shimansky, 1975. PIW2002IV−4 from the Krasnoyarka Formation, Member 1 (Pachydiscus (P.) aff. egertoni Zone, Upper Campanian), locality 0.6, Naiba River valley, Sakhalin; in lateral (B1, B3) and ventral (B2) views. Scale bar in the middle is for A, B1, and B3. Scale bars 2 cm." figureDoi="http://doi.org/10.5281/zenodo.13388403" httpUri="https://zenodo.org/record/13388403/files/figure.png" pageId="6" pageNumber="487">Fig. 6B</figureCitation>
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<figureCitation id="34CE2A4B8760FFEE3F44D709FDC22FC5" box="[573,582,1652,1669]" captionStart="Fig" captionStartId="2.[102,135,1578,1597]" captionTargetBox="[266,1322,225,1551]" captionTargetId="figure-136@2.[266,1322,225,1551]" captionTargetPageId="2" captionText="Fig. 2. Stratigraphic log of the Upper Santonian to Lower Maastrichtian of Sakhalin; numbers of lithostratigraphic members, nautiloid occurrences and biostratigraphic events (first and last appearance data, FAD/LAD) are indicated (modified after Yazykova 2002: fig. 2)." figureDoi="http://doi.org/10.5281/zenodo.13388393" httpUri="https://zenodo.org/record/13388393/files/figure.png" pageId="6" pageNumber="487">
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<subScript id="3071348B8760FFEE3F44D709FDC22FC5" attach="left" box="[573,582,1652,1669]" fontSize="7" pageId="6" pageNumber="487">2</subScript>
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</figureCitation>
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||
). On the inner to middle part of the flanks the ribs are slightly prorsiradiate, thencurvebackwardsandcrosstheventerwithamoderately rounded sinus (
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<figureCitation id="34CE2A4B8760FFEE3C6DD7B4FEEE2FA1" box="[276,362,1737,1761]" captionStart="Fig" captionStartId="5.[102,135,1485,1504]" captionTargetBox="[267,1293,229,1453]" captionTargetId="figure-190@5.[262,1326,225,1457]" captionTargetPageId="5" captionText="Fig. 6. A. Cymatoceras pseudoatlas (Yabe and Shimizu, 1924b). PIW2002IV−2 from the Krasnoyarka Formation, Member 2, locality 12 (Canadoceras multicostatum Zone, Upper Campanian), Naiba River valley, Sakhalin; apertural view [see also Fig. 5B]. B. Cymatoceras cf. bifidum Shimansky, 1975. PIW2002IV−4 from the Krasnoyarka Formation, Member 1 (Pachydiscus (P.) aff. egertoni Zone, Upper Campanian), locality 0.6, Naiba River valley, Sakhalin; in lateral (B1, B3) and ventral (B2) views. Scale bar in the middle is for A, B1, and B3. Scale bars 2 cm." figureDoi="http://doi.org/10.5281/zenodo.13388403" httpUri="https://zenodo.org/record/13388403/files/figure.png" pageId="6" pageNumber="487">Fig. 6B</figureCitation>
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<figureCitation id="34CE2A4B8760FFEE3C13D7A9FEF72FA5" box="[362,371,1748,1765]" captionStart="Fig" captionStartId="2.[102,135,1578,1597]" captionTargetBox="[266,1322,225,1551]" captionTargetId="figure-136@2.[266,1322,225,1551]" captionTargetPageId="2" captionText="Fig. 2. Stratigraphic log of the Upper Santonian to Lower Maastrichtian of Sakhalin; numbers of lithostratigraphic members, nautiloid occurrences and biostratigraphic events (first and last appearance data, FAD/LAD) are indicated (modified after Yazykova 2002: fig. 2)." figureDoi="http://doi.org/10.5281/zenodo.13388393" httpUri="https://zenodo.org/record/13388393/files/figure.png" pageId="6" pageNumber="487">
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<subScript id="3071348B8760FFEE3C13D7A9FEF72FA5" attach="left" box="[362,371,1748,1765]" fontSize="7" pageId="6" pageNumber="487">2</subScript>
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</figureCitation>
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). Neither suture nor the position of the siphuncle are visible.
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</paragraph>
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<paragraph id="AC4A36CE8760FFEE3D1FD66FFB8F2A20" blockId="6.[102,775,1810,2026]" lastBlockId="6.[812,1486,232,864]" pageId="6" pageNumber="487">
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<emphasis id="9E81EADC8760FFEE3D1FD66FFF4C2E6A" box="[102,200,1810,1834]" italics="true" pageId="6" pageNumber="487">Remarks</emphasis>
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.—This specimen is very close to
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<taxonomicName id="6BF54D4D8760FFEE3F32D66FFF222E0A" authorityName="Shimansky" authorityYear="1975" class="Cephalopoda" family="Cymatoceratidae" genus="Cymatoceras" higherTaxonomySource="GBIF" kingdom="Animalia" order="Nautilida" pageId="6" pageNumber="487" phylum="Mollusca" rank="species" species="bifidum">
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<emphasis id="9E81EADC8760FFEE3F32D66FFF222E0A" italics="true" pageId="6" pageNumber="487">Cymatoceras bifidum</emphasis>
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</taxonomicName>
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, especially in the style of ornament (broad ribs on flank, irregular bifurcations), but also the general shell form and the funnel−like, deep umbilicus (U/D = 0.15 in the
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<typeStatus id="734E886C8760FFEE3D1FD6EFFF4E2EEA" box="[102,202,1938,1962]" pageId="6" pageNumber="487" type="holotype">holotype</typeStatus>
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) are similar. That species was erected by
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<bibRefCitation id="C8644B3F8760FFEE3FE4D6EFFF582E8A" author="Shimansky, V. N. & Simanskij, V. N." pageId="6" pageNumber="487" pagination="1 - 208" refId="ref5759" refString="Shimansky, V. N. [Simanskij, V. N.] 1975. Cretaceousnautiloids [inRussian]. Trudy Paleontologiceskogo Instituta Akademii Nauk SSSR 150: 1 - 208." type="journal article" year="1975">Shimansky (1975)</bibRefCitation>
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on the basis of a single specimen from the “Santonian” of Naiba,
|
||
<collectingRegion id="6E31F82C8760FFEE3C09D6AFFE522EAA" box="[368,470,2002,2026]" country="Russia" name="Sakhalin" pageId="6" pageNumber="487">Sakhalin</collectingRegion>
|
||
. According to the locality details (see below) and refined stratigraphy of that area, this find has now to be regarded as Lower Campanian. The holotypefiguredbyShimansky(1975)inpl.23:1a,seemsto have suffered a non−fatal shell injury, partly causing the irregular ribbing pattern on the flank. Due to the poor preservation, only some of the specific characters are unequivocally discernible (general ribbing pattern, umbilicus), and, therefore, our specimen is referred to
|
||
<taxonomicName id="6BF54D4D8760FFEE39A6D0B4FADC28A0" authorityName="Shimansky" authorityYear="1975" box="[1247,1368,456,480]" class="Cephalopoda" family="Cymatoceratidae" genus="Cymatoceras" higherTaxonomySource="GBIF" kingdom="Animalia" order="Nautilida" pageId="6" pageNumber="487" phylum="Mollusca" rank="species" species="bifidum">
|
||
<emphasis id="9E81EADC8760FFEE39A6D0B4FADC28A0" box="[1247,1368,456,480]" italics="true" pageId="6" pageNumber="487">C. bifidum</emphasis>
|
||
</taxonomicName>
|
||
only with reservation.
|
||
<taxonomicName id="6BF54D4D8760FFEE3EC0D094FC292B61" authority="Matsumoto and Muramoto, 1983" authorityName="Matsumoto and Muramoto" authorityYear="1983" class="Cephalopoda" family="Cymatoceratidae" genus="Cymatoceras" higherTaxonomySource="GBIF" kingdom="Animalia" order="Nautilida" pageId="6" pageNumber="487" phylum="Mollusca" rank="species" species="pacificum">
|
||
<emphasis id="9E81EADC8760FFEE3EC0D094FB402B41" box="[953,1220,489,513]" italics="true" pageId="6" pageNumber="487">Cymatoceras pacificum</emphasis>
|
||
<bibRefCitation id="C8644B3F8760FFEE39B4D094FC292B61" author="Matsumoto, T. & Muramoto, K." pageId="6" pageNumber="487" pagination="85 - 95" refId="ref5288" refString="Matsumoto, T. and Muramoto, K. 1983. Cretaceous nautiloids from Hokkaido-II, Part 2. Three nautiloid species from the Santonian and Campanian of Hokkaido. Transactions and Proceedings of the Palaeontological Society of Japan, n. s. 130: 85 - 95." type="book chapter" year="1983">Matsumoto and Muramoto, 1983</bibRefCitation>
|
||
</taxonomicName>
|
||
(92, pl. 18: 1, pl. 19: 1, pl. 20: 1, 2, text−fig. 3) from the lower Upper Campanian of
|
||
<collectingRegion id="6E31F82C8760FFEE39ABD355FAC72B00" box="[1234,1347,552,576]" country="Japan" name="Hokkaido" pageId="6" pageNumber="487">Hokkaido</collectingRegion>
|
||
, is a similar species concerning shell parameters. However, its style of ribbing is more regular and the ribs are finer. Furthermore, the whorl section is slightly more depressed in this species and the umbilicus is very narrow to occluded.
|
||
<taxonomicName id="6BF54D4D8760FFEE3840D3D4FBD82BA0" authority="(Blanford, 1861)" baseAuthorityName="Blanford" baseAuthorityYear="1861" class="Cephalopoda" family="Cymatoceratidae" genus="Cymatoceras" higherTaxonomySource="GBIF" kingdom="Animalia" order="Nautilida" pageId="6" pageNumber="487" phylum="Mollusca" rank="species" species="kayeanus">
|
||
<emphasis id="9E81EADC8760FFEE3840D3D4FC102BA0" italics="true" pageId="6" pageNumber="487">Cymatoceras kayeanus</emphasis>
|
||
(
|
||
<bibRefCitation id="C8644B3F8760FFEE3EDDD3B5FBD62BA0" author="Blanford, H. F." box="[932,1106,712,736]" pageId="6" pageNumber="487" pagination="1 - 40" refId="ref4718" refString="Blanford, H. F. 1861. The fossil Cephalopoda of the Cretaceous rocks of southern India. I. Belemnitida - Nautilidae. Memoir of the Geological Survey of India, Palaeontologica Indica 1 (1): 1 - 40." type="journal article" year="1861">Blanford, 1861</bibRefCitation>
|
||
)
|
||
</taxonomicName>
|
||
, a common species in the Lower CampanianofMadagascar(
|
||
<bibRefCitation id="C8644B3F8760FFEE3912D395FA9C2A40" author="Kabamba, M." box="[1131,1304,744,768]" pageId="6" pageNumber="487" refId="ref4905" refString="Kabamba, M. 1983. Les nautiles du Cretace superieur de Madagascar; contribution a l'etude de l'evolution des NautiloIdes du Cretace; systematique, phylogenie, biostratigraphie, paleoecologie, evolution. Th e se 3 e cycle, 148 pp. Geologie, Universite Dijon [unpublished]." type="book" year="1983">Kabamba1983</bibRefCitation>
|
||
),issimilarinrespect to the form of the ventral sinus. It, however, has more densely spaced, finer ribs, and is slightly more evolute and clearly compressed.
|
||
</paragraph>
|
||
<paragraph id="AC4A36CE8760FFEE3E55D20CFAC22D69" blockId="6.[812,1485,881,1065]" pageId="6" pageNumber="487">
|
||
<emphasis id="9E81EADC8760FFEE3E55D20CFC2A2AC8" box="[812,942,881,904]" italics="true" pageId="6" pageNumber="487">Occurrence</emphasis>
|
||
.—OurspecimenisfromtheKrasnoyarkaFormation,Member1,locality0.6intheNaibaRivervalley(
|
||
<taxonomicName id="6BF54D4D8760FFEE3806D2ECFCF52A89" authorityName="Zittel" authorityYear="1884" class="Cephalopoda" family="Pachydiscidae" genus="Pachydiscus" kingdom="Animalia" pageId="6" pageNumber="487" phylum="Mollusca" rank="genus">
|
||
<emphasis id="9E81EADC8760FFEE3806D2ECFCF52A89" italics="true" pageId="6" pageNumber="487">Pachydiscus</emphasis>
|
||
</taxonomicName>
|
||
(
|
||
<emphasis id="9E81EADC8760FFEE3EFAD2CFFC102A89" box="[899,916,946,969]" italics="true" pageId="6" pageNumber="487">P</emphasis>
|
||
.) aff.
|
||
<emphasis id="9E81EADC8760FFEE3EA3D2CFFBB22A89" box="[986,1078,946,969]" italics="true" pageId="6" pageNumber="487">egertoni</emphasis>
|
||
Zone, lower Upper Campanian; see Figs.2,3).Theholotypeof
|
||
<taxonomicName id="6BF54D4D8760FFEE3925D2ACFB4B2AA9" authorityName="Shimansky" authorityYear="1975" box="[1116,1231,977,1001]" class="Cephalopoda" family="Cymatoceratidae" genus="Cymatoceras" higherTaxonomySource="GBIF" kingdom="Animalia" order="Nautilida" pageId="6" pageNumber="487" phylum="Mollusca" rank="species" species="bifidum">
|
||
<emphasis id="9E81EADC8760FFEE3925D2ACFB4B2AA9" box="[1116,1231,977,1001]" italics="true" pageId="6" pageNumber="487">C. bifidum</emphasis>
|
||
</taxonomicName>
|
||
comesfromtheLower CampanianofSakhalin,NaibaRiver,neartheRiverSeimestuary (left tributary of Naiba) (
|
||
<bibRefCitation id="C8644B3F8760FFEE3902D56CFABD2D69" author="Shimansky, V. N. & Simanskij, V. N." box="[1147,1337,1041,1065]" pageId="6" pageNumber="487" pagination="1 - 208" refId="ref5759" refString="Shimansky, V. N. [Simanskij, V. N.] 1975. Cretaceousnautiloids [inRussian]. Trudy Paleontologiceskogo Instituta Akademii Nauk SSSR 150: 1 - 208." type="journal article" year="1975">Shimansky 1975</bibRefCitation>
|
||
).
|
||
</paragraph>
|
||
</subSubSection>
|
||
</treatment>
|
||
</document> |