237 lines
30 KiB
XML
237 lines
30 KiB
XML
<document id="C3710870BA5FB1FD2FDF6CE780CFCDCE" ID-CLB-Dataset="22319" ID-DOI="10.5852/ejt.2013.41" ID-GBIF-Dataset="386010a0-6da4-4fa3-9d1a-4b3b5427cac5" ID-ISSN="2118-9773" ID-Zenodo-Dep="3814221" ID-ZooBank="A2F1B9ED-870A-466E-B35E-BD5DA782476E" IM.materialsCitations_approvedBy="felipe" IM.metadata_approvedBy="felipe" IM.tables_requiresApprovalFor="existingObjects,plazi" IM.taxonomicNames_approvedBy="felipe" checkinTime="1588881240389" checkinUser="carolina" docAuthor="Kröger, Björn" docDate="2013" docId="AD4D9054CD576A52F3B04569FD94FB3D" docLanguage="en" docName="ejt-2013-41.pdf.imf" docOrigin="European Journal of Taxonomy 41" docStyle="DocumentStyle:EF2B578F1D15862ADE45B0C07C620911.14:EJT.2018-.journal_article.type1" docStyleId="EF2B578F1D15862ADE45B0C07C620911" docStyleName="EJT.2018-.journal_article.type1" docStyleVersion="14" docTitle="Gorbyoceras alternestriatum Kröger 2013, comb. nov." docType="treatment" docVersion="9" lastPageNumber="53" masterDocId="5174E82CCD646A66F260472AFFA5FFBD" masterDocTitle="The cephalopods of the Boda Limestone, Late Ordovician, of Dalarna, Sweden" masterLastPageNumber="110" masterPageNumber="1" pageNumber="52" updateTime="1698838944441" updateUser="ExternalLinkService" zenodo-license-document="CC-BY-3.0" zenodo-license-figures="CC-BY-3.0" zenodo-license-treatments="UNSPECIFIED">
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<mods:title id="85CB52BEF12B449C95D28599957D542C">The cephalopods of the Boda Limestone, Late Ordovician, of Dalarna, Sweden</mods:title>
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</mods:titleInfo>
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<mods:name id="E1B5A17618D6D5A2A7BF7D00E625B1C4" type="personal">
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<mods:namePart id="DF4C46CD848F1320F3E240EB3FFBC762">Kröger, Björn</mods:namePart>
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<mods:title id="337F0426729EF50B5EDDD360180730E7">European Journal of Taxonomy</mods:title>
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<mods:part id="5A3B0E065277D8645EBDC192179EC772">
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<mods:date id="2B6F6F2A095B499A43A564123EC705BE">2013</mods:date>
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<mods:number id="99BBA46E8FFD6F9BA5B05AE67D635EDA">2013-03-27</mods:number>
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<mods:number id="3D1D942C3FE822A53CC5A525523EBF60">41</mods:number>
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<mods:identifier id="0203CEDDC2845DC4F4110B452283341F" type="DOI">10.5852/ejt.2013.41</mods:identifier>
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<treatment id="AD4D9054CD576A52F3B04569FD94FB3D" ID-DOI="http://doi.org/10.5281/zenodo.3815222" ID-GBIF-Taxon="163977261" ID-Zenodo-Dep="3815222" LSID="urn:lsid:plazi:treatment:AD4D9054CD576A52F3B04569FD94FB3D" httpUri="http://treatment.plazi.org/id/AD4D9054CD576A52F3B04569FD94FB3D" lastPageId="52" lastPageNumber="53" pageId="51" pageNumber="52">
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<subSubSection id="6DFE72C9CD576A55F3B04569FBC1FDE3" box="[464,1124,579,606]" pageId="51" pageNumber="52" type="nomenclature">
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<paragraph id="255B2142CD576A55F3B04569FBC1FDE3" blockId="51.[464,1124,579,640]" box="[464,1124,579,606]" pageId="51" pageNumber="52">
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<heading id="7E13962ECD576A55F3B04569FBC1FDE3" box="[464,1124,579,606]" centered="true" fontSize="11" level="2" pageId="51" pageNumber="52" reason="2">
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<taxonomicName id="E2E45AC1CD576A55F3B04569FC7EFDE0" authority="(Strand, 1934)" authorityName="Kröger" authorityYear="2013" baseAuthorityName="Strand" baseAuthorityYear="1934" box="[464,987,579,606]" class="Cephalopoda" family="Proteoceratidae" genus="Gorbyoceras" higherTaxonomySource="GBIF" kingdom="Animalia" order="Orthocerida" pageId="51" pageNumber="52" phylum="Mollusca" rank="species" species="alternestriatum" status="comb. nov.">
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<emphasis id="1790FD50CD576A55F3B04569FC8FFDE3" bold="true" box="[464,810,579,606]" italics="true" pageId="51" pageNumber="52">Gorbyoceras alternestriatum</emphasis>
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(
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<bibRefCitation id="41755CB3CD576A55F15A4569FC76FDE0" author="Strand T." box="[826,979,579,605]" pageId="51" pageNumber="52" pagination="1 - 117" refId="ref49308" refString="Strand T. 1934. The Upper Ordovician Cephalopods of the Oslo Area. Norsk Geologiske Tidsskrift 14: 1 - 117." type="journal article" year="1934">Strand, 1934</bibRefCitation>
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)
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||
</taxonomicName>
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||
<taxonomicNameLabel id="0CA3402BCD576A55F1824569FBC1FDE3" box="[994,1124,579,606]" pageId="51" pageNumber="52" rank="species">comb. nov.</taxonomicNameLabel>
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</heading>
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||
</paragraph>
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||
</subSubSection>
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||
<subSubSection id="6DFE72C9CD576A55F0A9454CFCCEFD3D" box="[713,875,614,640]" pageId="51" pageNumber="52" type="description">
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||
<paragraph id="255B2142CD576A55F0A9454CFCCEFD3D" blockId="51.[464,1124,579,640]" box="[713,875,614,640]" pageId="51" pageNumber="52">
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<figureCitation id="BDDF3DC7CD576A55F0A9454CFC94FD3D" box="[713,817,614,640]" captionStart="Fig" captionStartId="30.[189,232,1770,1796]" captionTargetBox="[189,1395,932,1726]" captionTargetId="figure@30.[189,1400,932,1726]" captionTargetPageId="30" captionText="Fig. 16. Dawsonoceratidae and Proteoceratidae of the Boda Limestone. A-B. Dawsonoceras fenestratum (Eichwald, 1860), Kallholn. A. PMU 26702, nearly mature specimen with adorally decreasing angle of expansion. B. PMU 26712, juvenile specimen. C. Gorbyoceras sp. A, PMU 26772, Osmundsberget. D. Goryboceras sp. B, PMU 26773, Kallholn. E. Dawsonoceras stumburi sp. nov., PMU 26717, holotype, Kallholn. F. Gorbyoceras alternestriatum (Strand, 1934) comb. nov., PMU 26771, Unskarsheden. Scale bars: A-C, E = 10 mm; D = 10 mm; F = 10 mm." figureDoi="http://doi.org/10.5281/zenodo.3814257" httpUri="https://zenodo.org/record/3814257/files/figure.png" pageId="51" pageNumber="52">Figs 16F</figureCitation>
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,
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<figureCitation id="BDDF3DC7CD576A55F15D454CFCCEFD3D" box="[829,875,614,640]" captionStart="Fig" captionStartId="32.[189,232,1690,1716]" captionTargetBox="[189,1400,266,1648]" captionTargetId="figure@32.[189,1400,266,1647]" captionTargetPageId="32" captionText="Fig. 17. Shell ornamentation of selected Orthocerida of the Boda Formation. A. Isorthoceras cf. elongatocinctum (Portlock, 1843), PMU 26825, Kallholn, adoral part of the specimen. B. Dawsonoceras stumburi sp. nov., PMU 26717, holotype, Kallholn. C. Gorbyoceras sp. A, PMU 26772, Osmundsberget. D. Isorthoceras cf. elongatocinctum (Portlock, 1843), same specimen as in A, adapical part of specimen. E. Isorthoceras junceum (Hall, 1847), PMU 26834, Kallholn. F. Gorbyoceras alternestriatum (Strand, 1934) comb. nov., PMU 26771, Unskarsheden. G. Isorthoceras curvilineatum sp. nov., PMU 26787, holotype, Osmundsberget. H. Isorthoceras angelini sp. nov., PMU 26774, holotype, Kallholn. I. Isorthoceras suave (Angelin in Angelin & Lindström, 1880) comb. nov., PMU 26835, Kallholn. Scale bar = 5 mm for all figures." figureDoi="http://doi.org/10.5281/zenodo.3814259" httpUri="https://zenodo.org/record/3814259/files/figure.png" pageId="51" pageNumber="52">17F</figureCitation>
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</paragraph>
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</subSubSection>
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<subSubSection id="6DFE72C9CD576A55F2DD4582FC31FCBE" pageId="51" pageNumber="52" type="reference_group">
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<paragraph id="255B2142CD576A55F2DD4582FCD9FD7F" blockId="51.[189,892,680,707]" box="[189,892,680,707]" pageId="51" pageNumber="52">
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<treatmentCitationGroup id="05F4066CCD576A55F2DD4582FCD9FD7F" box="[189,892,680,707]" pageId="51" pageNumber="52">
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<treatmentCitation id="A4450753CD576A55F2DD4582FD6DFD7F" author="Strand T." box="[189,712,680,706]" page="19" pageId="51" pageNumber="52" year="1934">
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<taxonomicName id="E2E45AC1CD576A55F2DD4582FD6DFD7F" authority="Strand, 1934: 19" authorityName="Strand" authorityPageNumber="19" authorityYear="1934" box="[189,712,680,706]" class="Cephalopoda" family="Pseudorthoceratidae" genus="Spyroceras" higherTaxonomySource="GBIF" kingdom="Animalia" order="Orthocerida" pageId="51" pageNumber="52" phylum="Mollusca" rank="species" species="alternestriatum">
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<emphasis id="1790FD50CD576A55F2DD4582FE59FD7F" box="[189,508,680,706]" italics="true" pageId="51" pageNumber="52">Spyroceras alternestriatum</emphasis>
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<bibRefCitation id="41755CB3CD576A55F0634582FD6DFD7F" author="Strand T." box="[515,712,680,706]" pageId="51" pageNumber="52" pagination="1 - 117" refId="ref49308" refString="Strand T. 1934. The Upper Ordovician Cephalopods of the Oslo Area. Norsk Geologiske Tidsskrift 14: 1 - 117." type="journal article" year="1934">Strand, 1934: 19</bibRefCitation>
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</taxonomicName>
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</treatmentCitation>
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, pl. 3, figs 5, 6.
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</treatmentCitationGroup>
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</paragraph>
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<paragraph id="255B2142CD576A55F2DD45C3FC31FCBE" blockId="51.[189,916,745,772]" box="[189,916,745,772]" pageId="51" pageNumber="52">
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<treatmentCitationGroup id="05F4066CCD576A55F2DD45C3FC31FCBE" box="[189,916,745,772]" pageId="51" pageNumber="52">
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||
<taxonomicName id="E2E45AC1CD576A55F2DD45C3FEF3FCBE" authorityName="Shimizu & Obata" authorityYear="1935" box="[189,342,745,771]" class="Cephalopoda" family="Proteoceratidae" genus="Gorbyoceras" higherTaxonomySource="GBIF" kingdom="Animalia" order="Orthocerida" pageId="51" pageNumber="52" phylum="Mollusca" rank="genus">
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<emphasis id="1790FD50CD576A55F2DD45C3FEF3FCBE" box="[189,342,745,771]" italics="true" pageId="51" pageNumber="52">Gorbyoceras</emphasis>
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</taxonomicName>
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sp. –
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<treatmentCitation id="A4450753CD576A55F3FC45C3FDF3FCBE" author="Dzik J." box="[412,598,745,771]" page="122" pageId="51" pageNumber="52" year="1984">
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<bibRefCitation id="41755CB3CD576A55F3FC45C3FDF3FCBE" author="Dzik J." box="[412,598,745,771]" pageId="51" pageNumber="52" refId="ref47068" refString="Dzik J. 1984. Phylogeny of the Nautiloidea. Palaeontologia Polonica, Vol. 45, 203 pp." type="book" year="1984">Dzik 1984: 122</bibRefCitation>
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</treatmentCitation>
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, text-fig. 48d, pl. 35, fig. 1.
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</treatmentCitationGroup>
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</paragraph>
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||
</subSubSection>
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||
<subSubSection id="6DFE72C9CD576A55F2DD4401FC81FBD7" pageId="51" pageNumber="52" type="diagnosis">
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||
<paragraph id="255B2142CD576A55F2DD4401FE0AFCF9" blockId="51.[189,431,810,837]" box="[189,431,810,837]" pageId="51" pageNumber="52">
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<heading id="7E13962ECD576A55F2DD4401FE0AFCF9" bold="true" box="[189,431,810,837]" fontSize="11" level="3" pageId="51" pageNumber="52" reason="3">
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<emphasis id="1790FD50CD576A55F2DD4401FE0AFCF9" bold="true" box="[189,431,810,837]" pageId="51" pageNumber="52">Emended diagnosis</emphasis>
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</heading>
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</paragraph>
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<paragraph id="255B2142CD576A55F2DD4473FC81FBD7" blockId="51.[189,1399,857,1130]" pageId="51" pageNumber="52">
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<taxonomicName id="E2E45AC1CD576A55F2DD4473FEF3FCCE" authorityName="Shimizu & Obata" authorityYear="1935" box="[189,342,857,883]" class="Cephalopoda" family="Proteoceratidae" genus="Gorbyoceras" higherTaxonomySource="GBIF" kingdom="Animalia" order="Orthocerida" pageId="51" pageNumber="52" phylum="Mollusca" rank="genus">
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<emphasis id="1790FD50CD576A55F2DD4473FEF3FCCE" box="[189,342,857,883]" italics="true" pageId="51" pageNumber="52">Gorbyoceras</emphasis>
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</taxonomicName>
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with slightly cyrtoconic adult body chamber, shell slightly compressed, relatively large adult size of more than
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<quantity id="E21C8CA7CD576A55F38F4456FDEDFC2A" box="[495,584,892,919]" metricMagnitude="-2" metricUnit="m" metricValue="5.0" pageId="51" pageNumber="52" unit="mm" value="50.0">50 mm</quantity>
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in conch height; slightly irregularly spaced, pronounced rounded annulations, approximately five to six in a length equal to conch diameter; approximately 30 regularly spaced longitudinal lirae around the entire circumference; in interspaces between primary lirae one or two less pronounced secondary lirae occur, approximately 12–15 fine transverse angular lirae between two successive ridges of annulations; sutures straight, nearly transverse, one suture at each groove of the annulations. Siphuncle eccentric in juvenile, subcentral in more adult growth stages, septal perforation approximately one tenth of the diameter of the shell.
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</paragraph>
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</subSubSection>
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<subSubSection id="6DFE72C9CD576A55F2DD43BBFBD4FAD0" pageId="51" pageNumber="52" type="materials_examined">
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<paragraph id="255B2142CD576A55F2DD43BBFE5EFB16" blockId="51.[189,507,1169,1195]" box="[189,507,1169,1195]" pageId="51" pageNumber="52">
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<heading id="7E13962ECD576A55F2DD43BBFE5EFB16" bold="true" box="[189,507,1169,1195]" fontSize="11" level="3" pageId="51" pageNumber="52" reason="3">
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<emphasis id="1790FD50CD576A55F2DD43BBFE5EFB16" bold="true" box="[189,507,1169,1195]" pageId="51" pageNumber="52">
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<typeStatus id="FA5F9FE0CD576A55F2DD43BBFF5FFB16" box="[189,250,1169,1195]" pageId="51" pageNumber="52">Type</typeStatus>
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locality and horizon
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</emphasis>
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</heading>
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</paragraph>
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<paragraph id="255B2142CD576A55F2DD43EAFABAFB64" blockId="51.[189,1311,1215,1242]" box="[189,1311,1215,1242]" pageId="51" pageNumber="52">
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Stavnestangen, Ringerike District,
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<collectingCountry id="5DF361D2CD576A55F03743EAFD12FB67" box="[599,695,1216,1242]" name="Norway" pageId="51" pageNumber="52">Norway</collectingCountry>
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, Bønsnes Formation, latest Katian, Late Ordovician.
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</paragraph>
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<paragraph id="255B2142CD576A55F2DD422BFE0FFAA6" blockId="51.[189,426,1281,1307]" box="[189,426,1281,1307]" pageId="51" pageNumber="52">
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<heading id="7E13962ECD576A55F2DD422BFE0FFAA6" bold="true" box="[189,426,1281,1307]" fontSize="11" level="3" pageId="51" pageNumber="52" reason="3">
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<emphasis id="1790FD50CD576A55F2DD422BFE0FFAA6" bold="true" box="[189,426,1281,1307]" pageId="51" pageNumber="52">Material examined</emphasis>
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</heading>
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</paragraph>
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<paragraph id="255B2142CD576A55F2DD421AFBD4FAD0" blockId="51.[189,1398,1327,1389]" pageId="51" pageNumber="52">
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Two specimens (
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<collectionCode id="43F5B987CD576A55F3E9421AFE6EFAF7" box="[393,459,1328,1354]" country="Sweden" httpUri="http://grbio.org/cool/32ji-dbbk" name="Paleontological Museum of Uppsala" pageId="51" pageNumber="52">PMU</collectionCode>
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26769, 26770), Kallholn; one specimen (
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<collectionCode id="43F5B987CD576A55F1A7421AFBACFAF7" box="[967,1033,1328,1354]" country="Sweden" httpUri="http://grbio.org/cool/32ji-dbbk" name="Paleontological Museum of Uppsala" pageId="51" pageNumber="52">PMU</collectionCode>
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26771), Unskarsheden, Siljan District,
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<collectingCountry id="5DF361D2CD576A55F3444279FE20FAD0" box="[292,389,1363,1389]" name="Sweden" pageId="51" pageNumber="52">Sweden</collectingCountry>
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; Boda Limestone, Boda Core Member, late Katian, Ordovician.
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</paragraph>
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</subSubSection>
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<subSubSection id="6DFE72C9CD576A52F2DD42BEFBEDFE32" lastPageId="52" lastPageNumber="53" pageId="51" pageNumber="52" type="description">
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||
<paragraph id="255B2142CD576A55F2DD42BEFEEBFA13" blockId="51.[189,334,1428,1454]" box="[189,334,1428,1454]" pageId="51" pageNumber="52">
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||
<heading id="7E13962ECD576A55F2DD42BEFEEBFA13" bold="true" box="[189,334,1428,1454]" fontSize="11" level="3" pageId="51" pageNumber="52" reason="3">
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||
<emphasis id="1790FD50CD576A55F2DD42BEFEEBFA13" bold="true" box="[189,334,1428,1454]" pageId="51" pageNumber="52">Description</emphasis>
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</heading>
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</paragraph>
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<paragraph id="255B2142CD576A55F2DD42E9FCCCF880" blockId="51.[189,1399,1475,1853]" pageId="51" pageNumber="52">
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||
Specimen PMU 26771 is a nearly complete body chamber of a mature individual with a length of
|
||
<quantity id="E21C8CA7CD576A55F74642E9FAD2FA60" box="[1318,1399,1475,1501]" metricMagnitude="-2" metricUnit="m" metricValue="9.0" pageId="51" pageNumber="52" unit="mm" value="90.0">90 mm</quantity>
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||
and an adoral conch height of
|
||
<quantity id="E21C8CA7CD576A55F04142CCFDD1F9BD" box="[545,628,1510,1537]" metricMagnitude="-2" metricUnit="m" metricValue="5.1" pageId="51" pageNumber="52" unit="mm" value="51.0">51 mm</quantity>
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||
and
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||
<quantity id="E21C8CA7CD576A55F0CC42CCFD5AF9BD" box="[684,767,1510,1536]" metricMagnitude="-2" metricUnit="m" metricValue="4.7" pageId="51" pageNumber="52" unit="mm" value="47.0">47 mm</quantity>
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||
at the apical end of the specimen (angle of expansion 2.5°) (
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<figureCitation id="BDDF3DC7CD576A55F3664123FECBF999" box="[262,366,1545,1572]" captionStart="Fig" captionStartId="30.[189,232,1770,1796]" captionTargetBox="[189,1395,932,1726]" captionTargetId="figure@30.[189,1400,932,1726]" captionTargetPageId="30" captionText="Fig. 16. Dawsonoceratidae and Proteoceratidae of the Boda Limestone. A-B. Dawsonoceras fenestratum (Eichwald, 1860), Kallholn. A. PMU 26702, nearly mature specimen with adorally decreasing angle of expansion. B. PMU 26712, juvenile specimen. C. Gorbyoceras sp. A, PMU 26772, Osmundsberget. D. Goryboceras sp. B, PMU 26773, Kallholn. E. Dawsonoceras stumburi sp. nov., PMU 26717, holotype, Kallholn. F. Gorbyoceras alternestriatum (Strand, 1934) comb. nov., PMU 26771, Unskarsheden. Scale bars: A-C, E = 10 mm; D = 10 mm; F = 10 mm." figureDoi="http://doi.org/10.5281/zenodo.3814257" httpUri="https://zenodo.org/record/3814257/files/figure.png" pageId="51" pageNumber="52">Fig. 16F</figureCitation>
|
||
). The conch cross section is slightly compressed with ratio of the width to height of 0.91. The conch is slightly curved with the siphuncle, eccentric (SPR 0.34) on the convex side of the conch curvature. The septal perforation is
|
||
<quantity id="E21C8CA7CD576A55F008417AFD0BF9D7" box="[616,686,1616,1642]" metricMagnitude="-3" metricUnit="m" metricValue="3.0" pageId="51" pageNumber="52" unit="mm" value="3.0">3 mm</quantity>
|
||
wide (0.06 of conch height). The septum at the base of the body chamber is shallow, with a depth of
|
||
<quantity id="E21C8CA7CD576A55F0D84159FCA8F930" box="[696,781,1651,1677]" metricMagnitude="-2" metricUnit="m" metricValue="1.0" pageId="51" pageNumber="52" unit="mm" value="10.0">10 mm</quantity>
|
||
(0.21 of conch height). The shell is annulated with slightly irregularly spaced and irregularly elevated rounded elevations; ca. six occur in a length equal to conch diameter. Around the circumference ca. 32 regularly spaced, distinctly raised primary lirae occur. In the interspaces one slightly less pronounced longitudinal raised line occurs. Additionally the conch is ornamented with fine, angular transverse lirae, 12–15 occurring between two successive ridges of the annulations, generating a fine reticulate pattern (
|
||
<figureCitation id="BDDF3DC7CD576A55F0944009FCF9F880" box="[756,860,1827,1853]" captionStart="Fig" captionStartId="32.[189,232,1690,1716]" captionTargetBox="[189,1400,266,1648]" captionTargetId="figure@32.[189,1400,266,1647]" captionTargetPageId="32" captionText="Fig. 17. Shell ornamentation of selected Orthocerida of the Boda Formation. A. Isorthoceras cf. elongatocinctum (Portlock, 1843), PMU 26825, Kallholn, adoral part of the specimen. B. Dawsonoceras stumburi sp. nov., PMU 26717, holotype, Kallholn. C. Gorbyoceras sp. A, PMU 26772, Osmundsberget. D. Isorthoceras cf. elongatocinctum (Portlock, 1843), same specimen as in A, adapical part of specimen. E. Isorthoceras junceum (Hall, 1847), PMU 26834, Kallholn. F. Gorbyoceras alternestriatum (Strand, 1934) comb. nov., PMU 26771, Unskarsheden. G. Isorthoceras curvilineatum sp. nov., PMU 26787, holotype, Osmundsberget. H. Isorthoceras angelini sp. nov., PMU 26774, holotype, Kallholn. I. Isorthoceras suave (Angelin in Angelin & Lindström, 1880) comb. nov., PMU 26835, Kallholn. Scale bar = 5 mm for all figures." figureDoi="http://doi.org/10.5281/zenodo.3814259" httpUri="https://zenodo.org/record/3814259/files/figure.png" pageId="51" pageNumber="52">Fig. 17F</figureCitation>
|
||
).
|
||
</paragraph>
|
||
<paragraph id="255B2142CD576A52F2DD404EFBEDFE32" blockId="51.[189,1398,1892,1954]" lastBlockId="52.[189,1399,267,399]" lastPageId="52" lastPageNumber="53" pageId="51" pageNumber="52">
|
||
The two other specimens consist of portions of phragmocone with diameters from
|
||
<quantity id="E21C8CA7CD576A55F6C0404EFA9AF8C2" box="[1184,1343,1892,1919]" metricMagnitude="-2" metricUnit="m" metricValue="2.0" metricValueMax="2.2" metricValueMin="1.8" pageId="51" pageNumber="52" unit="mm" value="20.0" valueMax="22.0" valueMin="18.0">18 to 22 mm</quantity>
|
||
, and from
|
||
<quantity id="E21C8CA7CD576A55F29C40ADFE2AF81F" box="[252,399,1927,1954]" metricMagnitude="-2" metricUnit="m" metricValue="2.25" metricValueMax="2.3" metricValueMin="2.2" pageId="51" pageNumber="52" unit="mm" value="22.5" valueMax="23.0" valueMin="22.0">22 to 23 mm</quantity>
|
||
respectively, with angles of expansion of ca. 8°. The distance between two successive annuli is ca. 0.18 of the corresponding conch cross section. The cross section is nearly circular. In specimen PMU 26769 the distance between the chambers is 0.18, and the suture lies in the groove of the annulation. The surface of this specimen is ornamented with 32 and 28 primary lirae, respectively. Between the primary lirae, one or two less pronounced secondary lirae occur.
|
||
</paragraph>
|
||
</subSubSection>
|
||
<subSubSection id="6DFE72C9CD506A52F2DD469DFC26FC77" pageId="52" pageNumber="53" type="discussion">
|
||
<paragraph id="255B2142CD506A52F2DD469DFE8AFE6C" blockId="52.[189,303,439,465]" box="[189,303,439,465]" pageId="52" pageNumber="53">
|
||
<heading id="7E13962ECD506A52F2DD469DFE8AFE6C" bold="true" box="[189,303,439,465]" fontSize="11" level="3" pageId="52" pageNumber="53" reason="3">
|
||
<emphasis id="1790FD50CD506A52F2DD469DFE8AFE6C" bold="true" box="[189,303,439,465]" pageId="52" pageNumber="53">Remarks</emphasis>
|
||
</heading>
|
||
</paragraph>
|
||
<paragraph id="255B2142CD506A52F2DD46CFFB41FDD5" blockId="52.[189,1399,485,617]" pageId="52" pageNumber="53">
|
||
The specimens described above are assigned to
|
||
<taxonomicName id="E2E45AC1CD506A52F08646CFFB4CFE42" authority="(Strand, 1934)" authorityName="Kröger" authorityYear="2013" baseAuthorityName="Strand" baseAuthorityYear="1934" box="[742,1257,485,511]" class="Cephalopoda" family="Proteoceratidae" genus="Gorbyoceras" higherTaxonomySource="GBIF" kingdom="Animalia" order="Orthocerida" pageId="52" pageNumber="53" phylum="Mollusca" rank="species" species="alternestriatum" status="comb. nov.">
|
||
<emphasis id="1790FD50CD506A52F08646CFFB9FFE42" box="[742,1082,485,511]" italics="true" pageId="52" pageNumber="53">Gorbyoceras alternestriatum</emphasis>
|
||
(
|
||
<bibRefCitation id="41755CB3CD506A52F62946CFFB45FE42" author="Strand T." box="[1097,1248,485,511]" pageId="52" pageNumber="53" pagination="1 - 117" refId="ref49308" refString="Strand T. 1934. The Upper Ordovician Cephalopods of the Oslo Area. Norsk Geologiske Tidsskrift 14: 1 - 117." type="journal article" year="1934">Strand, 1934</bibRefCitation>
|
||
)
|
||
</taxonomicName>
|
||
<taxonomicNameLabel id="0CA3402BCD506A52F68F46CFFAD7FE42" box="[1263,1394,485,511]" pageId="52" pageNumber="53" rank="species">comb. nov.</taxonomicNameLabel>
|
||
, because they agree in detail with the specimens described by
|
||
<bibRefCitation id="41755CB3CD506A52F1E24522FB86FD9F" author="Strand T." box="[898,1059,520,546]" pageId="52" pageNumber="53" pagination="1 - 117" refId="ref49308" refString="Strand T. 1934. The Upper Ordovician Cephalopods of the Oslo Area. Norsk Geologiske Tidsskrift 14: 1 - 117." type="journal article" year="1934">Strand (1934)</bibRefCitation>
|
||
from the Bønsnes Formation of
|
||
<collectingCountry id="5DF361D2CD506A52F2804506FEE5FDFB" box="[224,320,556,582]" name="Norway" pageId="52" pageNumber="53">Norway</collectingCountry>
|
||
. The new data, available from the adult body chamber PMU 26771, and additional data regarding the internal characters permit a more detailed species diagnosis and emendation.
|
||
</paragraph>
|
||
<paragraph id="255B2142CD506A52F2DD45BAFEFDFD17" blockId="52.[189,344,656,682]" box="[189,344,656,682]" pageId="52" pageNumber="53">
|
||
<heading id="7E13962ECD506A52F2DD45BAFEFDFD17" bold="true" box="[189,344,656,682]" fontSize="11" level="3" pageId="52" pageNumber="53" reason="3">
|
||
<emphasis id="1790FD50CD506A52F2DD45BAFEFDFD17" bold="true" box="[189,344,656,682]" pageId="52" pageNumber="53">Comparison</emphasis>
|
||
</heading>
|
||
</paragraph>
|
||
<paragraph id="255B2142CD506A52F2DD4594FC26FCFF" blockId="52.[189,1399,702,835]" pageId="52" pageNumber="53">
|
||
This species is very similar to
|
||
<taxonomicName id="E2E45AC1CD506A52F0744595FC0DFD64" authority="(Roemer, 1861)" authorityName="Kröger" authorityYear="2013" baseAuthorityName="Roemer" baseAuthorityYear="1861" box="[532,936,702,729]" class="Cephalopoda" family="Pseudorthoceratidae" genus="Spyroceras" higherTaxonomySource="GBIF" kingdom="Animalia" order="Orthocerida" pageId="52" pageNumber="53" phylum="Mollusca" rank="species" species="textumaraneum" status="comb. nov.">
|
||
<emphasis id="1790FD50CD506A52F0744595FD49FD65" box="[532,748,703,729]" italics="true" pageId="52" pageNumber="53">G. textumaraneum</emphasis>
|
||
(
|
||
<bibRefCitation id="41755CB3CD506A52F09A4595FC05FD64" author="Roemer C. F." box="[762,928,702,729]" pageId="52" pageNumber="53" refId="ref49074" refString="Roemer C. F. 1861. Die fossile Fauna der silurischen Diluvial-Geschiebe von Sadewitz bei Oels in Nieder-Schlsien. Breslau." type="book" year="1861">Roemer, 1861</bibRefCitation>
|
||
)
|
||
</taxonomicName>
|
||
<taxonomicNameLabel id="0CA3402BCD506A52F1CD4594FB8BFD65" box="[941,1070,702,729]" pageId="52" pageNumber="53" rank="species">comb. nov.</taxonomicNameLabel>
|
||
Both species have relatively large (more than
|
||
<quantity id="E21C8CA7CD506A52F3EB45C8FE7AFD41" box="[395,479,738,764]" metricMagnitude="-2" metricUnit="m" metricValue="4.0" pageId="52" pageNumber="53" unit="mm" value="40.0">40 mm</quantity>
|
||
in conch diameter), curved adult body chambers, combined with a relatively widely spaced reticulate ornamentation.
|
||
<taxonomicName id="E2E45AC1CD506A52F0F9442FFCD7FCA2" authorityName="Kröger" authorityYear="2013" baseAuthorityName="Strand" baseAuthorityYear="1934" box="[665,882,773,799]" class="Cephalopoda" family="Proteoceratidae" genus="Gorbyoceras" higherTaxonomySource="GBIF" kingdom="Animalia" order="Orthocerida" pageId="52" pageNumber="53" phylum="Mollusca" rank="species" species="alternestriatum" status="comb. nov.">
|
||
<emphasis id="1790FD50CD506A52F0F9442FFCD7FCA2" box="[665,882,773,799]" italics="true" pageId="52" pageNumber="53">G. alternestriatum</emphasis>
|
||
</taxonomicName>
|
||
<taxonomicNameLabel id="0CA3402BCD506A52F11A442FFC59FCA2" box="[890,1020,773,799]" pageId="52" pageNumber="53" rank="species">comb. nov.</taxonomicNameLabel>
|
||
differs from the latter mainly in having a primary and secondary longitudinal ornamentation.
|
||
</paragraph>
|
||
<paragraph id="255B2142CD506A52F2DD4440FC26FC77" blockId="52.[189,1398,873,970]" pageId="52" pageNumber="53">
|
||
<taxonomicName id="E2E45AC1CD506A52F2DD4440FDB6FC3E" authority="Wilson, 1961" authorityName="Wilson" authorityYear="1961" box="[189,531,873,900]" class="Cephalopoda" family="Proteoceratidae" genus="Gorbyoceras" higherTaxonomySource="GBIF" kingdom="Animalia" order="Orthocerida" pageId="52" pageNumber="53" phylum="Mollusca" rank="species" species="tetreauense">
|
||
<emphasis id="1790FD50CD506A52F2DD4440FF77FC39" box="[189,210,874,900]" italics="true" pageId="52" pageNumber="53">G</emphasis>
|
||
.
|
||
<emphasis id="1790FD50CD506A52F2834440FECCFC3E" box="[227,361,874,899]" italics="true" pageId="52" pageNumber="53">tetreauense</emphasis>
|
||
Wilson, 1961
|
||
</taxonomicName>
|
||
from the late Katian, Ottawa Formation,
|
||
<collectingCountry id="5DF361D2CD506A52F66B4443FBC6FC3E" box="[1035,1123,873,899]" name="Canada" pageId="52" pageNumber="53">Canada</collectingCountry>
|
||
is similar with respect to the angle of expansion and general aspects of ornamentation, but differs in having a more curved, stronger expanding conch with less pronounced annulations.
|
||
</paragraph>
|
||
</subSubSection>
|
||
<subSubSection id="6DFE72C9CD506A52F2DD44DBFD94FB3D" pageId="52" pageNumber="53" type="multiple">
|
||
<paragraph id="255B2142CD506A52F2DD44DBFDD8FBB1" blockId="52.[189,637,1009,1036]" box="[189,637,1009,1036]" pageId="52" pageNumber="53">
|
||
<heading id="7E13962ECD506A52F2DD44DBFDD8FBB1" bold="true" box="[189,637,1009,1036]" fontSize="11" level="3" pageId="52" pageNumber="53" reason="3">
|
||
<emphasis id="1790FD50CD506A52F2DD44DBFDD8FBB1" bold="true" box="[189,637,1009,1036]" pageId="52" pageNumber="53">Stratigraphic and geographic range</emphasis>
|
||
</heading>
|
||
</paragraph>
|
||
<paragraph id="255B2142CD506A52F2DD430AFD94FB3D" blockId="52.[189,1399,1056,1152]" pageId="52" pageNumber="53">
|
||
Bønsnes Formation, latest Katian, Stavnestangen, Ringerike District,
|
||
<collectingCountry id="5DF361D2CD506A52F671430AFBCAFB87" box="[1041,1135,1056,1082]" name="Norway" pageId="52" pageNumber="53">Norway</collectingCountry>
|
||
(
|
||
<bibRefCitation id="41755CB3CD506A52F6E4430AFABBFB87" author="Strand T." box="[1156,1310,1056,1082]" pageId="52" pageNumber="53" pagination="1 - 117" refId="ref49308" refString="Strand T. 1934. The Upper Ordovician Cephalopods of the Oslo Area. Norsk Geologiske Tidsskrift 14: 1 - 117." type="journal article" year="1934">Strand 1934</bibRefCitation>
|
||
); latest Katian, erratic boulder, Międzyzdroje,
|
||
<collectingCountry id="5DF361D2CD506A52F0E84369FD7CFBE0" box="[648,729,1091,1117]" name="Poland" pageId="52" pageNumber="53">Poland</collectingCountry>
|
||
(
|
||
<bibRefCitation id="41755CB3CD506A52F08A4369FCC9FBE0" author="Dzik J." box="[746,876,1091,1117]" pageId="52" pageNumber="53" refId="ref47068" refString="Dzik J. 1984. Phylogeny of the Nautiloidea. Palaeontologia Polonica, Vol. 45, 203 pp." type="book" year="1984">Dzik 1984</bibRefCitation>
|
||
); Boda Limestone, Boda Core Member, late Katian, Siljan District,
|
||
<collectingCountry id="5DF361D2CD506A52F3AC434CFD88FB3D" box="[460,557,1126,1152]" name="Sweden" pageId="52" pageNumber="53">Sweden</collectingCountry>
|
||
.
|
||
</paragraph>
|
||
</subSubSection>
|
||
</treatment>
|
||
</document> |