152 lines
14 KiB
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152 lines
14 KiB
XML
<document ID-DOI="http://dx.doi.org/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" checkinTime="1588881240389" checkinUser="carolina" docAuthor="Kröger, Björn" docDate="2013" docId="AD4D9054CD226A20F03043AFFBA7F866" docLanguage="en" docName="ejt-2013-41.pdf.imf" docOrigin="European Journal of Taxonomy 41" docStyle="DocumentStyle:EF2B578F1D15862ADE45B0C07C620911.12:EJT.2018-.journal_article" docStyleId="EF2B578F1D15862ADE45B0C07C620911" docStyleName="EJT.2018-.journal_article" docStyleVersion="12" docTitle="Discoceras Barrande 1867" docType="treatment" docVersion="6" lastPageNumber="71" masterDocId="5174E82CCD646A66F260472AFFA5FFBD" masterDocTitle="The cephalopods of the Boda Limestone, Late Ordovician, of Dalarna, Sweden" masterLastPageNumber="110" masterPageNumber="1" pageNumber="71" updateTime="1634716833028" 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:mods xmlns:mods="http://www.loc.gov/mods/v3">
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<mods:titleInfo>
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<mods:title>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 type="personal">
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<mods:role>
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<mods:roleTerm>Author</mods:roleTerm>
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</mods:role>
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<mods:namePart>Kröger, Björn</mods:namePart>
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</mods:name>
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<mods:typeOfResource>text</mods:typeOfResource>
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<mods:relatedItem type="host">
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<mods:titleInfo>
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<mods:title>European Journal of Taxonomy</mods:title>
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</mods:titleInfo>
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<mods:part>
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<mods:date>2013</mods:date>
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<mods:detail type="pubDate">
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<mods:number>2013-03-27</mods:number>
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</mods:detail>
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<mods:detail type="issue">
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<mods:number>41</mods:number>
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</mods:detail>
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<mods:extent unit="page">
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<mods:start>1</mods:start>
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<mods:end>110</mods:end>
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</mods:extent>
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</mods:part>
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</mods:relatedItem>
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<mods:classification>journal article</mods:classification>
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<mods:identifier type="DOI">http://dx.doi.org/10.5852/ejt.2013.41</mods:identifier>
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<mods:identifier type="GBIF-Dataset">386010a0-6da4-4fa3-9d1a-4b3b5427cac5</mods:identifier>
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<mods:identifier type="ISSN">2118-9773</mods:identifier>
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<mods:identifier type="Zenodo-Dep">3814221</mods:identifier>
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<mods:identifier type="ZooBank">A2F1B9ED-870A-466E-B35E-BD5DA782476E</mods:identifier>
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</mods:mods>
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<treatment ID-DOI="http://doi.org/10.5281/zenodo.3815176" ID-GBIF-Taxon="163977270" ID-Zenodo-Dep="3815176" LSID="urn:lsid:plazi:treatment:AD4D9054CD226A20F03043AFFBA7F866" httpUri="http://treatment.plazi.org/id/AD4D9054CD226A20F03043AFFBA7F866" lastPageNumber="71" pageId="70" pageNumber="71">
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<subSubSection box="[592,995,1156,1183]" pageId="70" pageNumber="71" type="nomenclature">
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<paragraph blockId="70.[592,995,1156,1183]" box="[592,995,1156,1183]" pageId="70" pageNumber="71">
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<heading box="[592,995,1156,1183]" centered="true" fontSize="11" level="2" pageId="70" pageNumber="71" reason="2">
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Genus
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<taxonomicName authority="Barrande, 1867" authorityName="Barrande" authorityYear="1867" box="[675,995,1156,1183]" class="Cephalopoda" family="Trocholitidae" genus="Discoceras" higherTaxonomySource="GBIF" kingdom="Animalia" order="Tarphycerida" pageId="70" pageNumber="71" phylum="Mollusca" rank="genus">
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<emphasis bold="true" box="[675,807,1157,1183]" italics="true" pageId="70" pageNumber="71">Discoceras</emphasis>
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Barrande, 1867
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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 pageId="70" pageNumber="71" type="type_taxon">
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<paragraph blockId="70.[189,344,1222,1248]" box="[189,344,1222,1248]" pageId="70" pageNumber="71">
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<heading bold="true" box="[189,344,1222,1248]" fontSize="11" level="3" pageId="70" pageNumber="71" reason="3">
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<emphasis bold="true" box="[189,344,1222,1248]" pageId="70" pageNumber="71">
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<typeStatus box="[189,250,1222,1248]" pageId="70" pageNumber="71">Type</typeStatus>
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species
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</emphasis>
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</heading>
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</paragraph>
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<paragraph blockId="70.[189,1399,1268,1330]" pageId="70" pageNumber="71">
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<taxonomicName authority="Eichwald, 1842" authorityName="Eichwald" authorityYear="1842" box="[189,667,1268,1295]" class="Mammalia" family="Delphinidae" genus="Clymenia" higherTaxonomySource="CoL" kingdom="Animalia" order="Cetacea" pageId="70" pageNumber="71" phylum="Chordata" rank="species" species="antiquissima">
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<emphasis box="[189,463,1268,1294]" italics="true" pageId="70" pageNumber="71">Clymenia antiquissima</emphasis>
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<bibRefCitation author="Eichwald E. de" box="[476,667,1268,1295]" pageId="70" pageNumber="71" refId="ref47193" refString="Eichwald E. de. 1842. Die Urwelt Russlands durch Abbildungen erlaeutert. 2. Heft. Neuer Beitrag zur Geognosie Esthlands und Finlands. Akademie der Wissenschaften, St. Petersburg." type="book" year="1842">Eichwald, 1842</bibRefCitation>
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</taxonomicName>
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, Kärdla,
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<collectingRegion box="[783,884,1268,1294]" country="Estonia" name="Hiiumaa" pageId="70" pageNumber="71">Hiiumaa</collectingRegion>
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Island,
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<collectingCountry box="[987,1078,1268,1294]" name="Estonia" pageId="70" pageNumber="71">Estonia</collectingCountry>
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, presumably Vormsi/Pirgu Regional Stage (“Lyckholm stage” of
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<bibRefCitation author="Teichert C." box="[636,802,1304,1330]" pageId="70" pageNumber="71" pagination="264 - 312" refId="ref49750" refString="Teichert C. 1930. Die Cephalopoden-Fauna der Lyckholm-Stufe des Ostbaltikums. Palaontologische Zeitschrift 12: 264 - 312." type="journal article" year="1930">Teichert 1930</bibRefCitation>
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); by secondary designation (
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<bibRefCitation author="Schroder H." box="[1136,1314,1304,1330]" pageId="70" pageNumber="71" pagination="1 - 48" refId="ref49284" refString="Schroder H. 1891. Untersuchungen uber silurische Cephalopoden. Palaeontologische Abhandlungen, Neue Folge 1 (4): 1 - 48." type="journal article" year="1891">Schröder 1891</bibRefCitation>
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).
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</paragraph>
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</subSubSection>
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<subSubSection pageId="70" pageNumber="71" type="diagnosis">
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<paragraph blockId="70.[189,310,1369,1395]" box="[189,310,1369,1395]" pageId="70" pageNumber="71">
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<heading bold="true" box="[189,310,1369,1395]" fontSize="11" level="3" pageId="70" pageNumber="71" reason="3">
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<emphasis bold="true" box="[189,310,1369,1395]" pageId="70" pageNumber="71">Diagnosis</emphasis>
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</heading>
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</paragraph>
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<paragraph blockId="70.[189,1399,1416,1548]" pageId="70" pageNumber="71">
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Gradually expanded tarphycerids with smooth to strongly annulated conch; impression zone slightly developed; subquadrate conch cross section; siphuncle central in initial half-volution, gradually shifting toward dorsal conch margin during later growth stages; thick connecting rings. (Adopted from
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<bibRefCitation author="Furnish W. M. & Glenister B. F." pageId="70" pageNumber="71" pagination="368" refId="ref47896" refString="Furnish W. M. & Glenister B. F. 1964 b. Nautiloidea-Tarphycerida. In: Teichert C. (ed.) Treatise on Invertebrate Paleontology, Part K, Mollusca 3. K 343 - K 368. Geological Society of America and the University of Kansas Press, Boulder, Colorado." type="book chapter" year="1964">Furnish & Glenister 1964b</bibRefCitation>
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.)
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</paragraph>
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</subSubSection>
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<subSubSection pageId="70" pageNumber="71" type="discussion">
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<paragraph blockId="70.[189,303,1587,1613]" box="[189,303,1587,1613]" pageId="70" pageNumber="71">
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<heading bold="true" box="[189,303,1587,1613]" fontSize="11" level="3" pageId="70" pageNumber="71" reason="3">
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<emphasis bold="true" box="[189,303,1587,1613]" pageId="70" pageNumber="71">Remarks</emphasis>
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</heading>
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</paragraph>
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<paragraph blockId="70.[189,1399,1633,2012]" pageId="70" pageNumber="71">
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The genus
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<taxonomicName authority="Hyatt, 1894" authorityName="Hyatt" authorityYear="1894" box="[330,685,1633,1660]" class="Cephalopoda" family="Trocholitidae" genus="Schroederoceras" higherTaxonomySource="GBIF" kingdom="Animalia" order="Tarphycerida" pageId="70" pageNumber="71" phylum="Mollusca" rank="genus">
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<emphasis box="[330,527,1633,1659]" italics="true" pageId="70" pageNumber="71">Schroederoceras</emphasis>
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Hyatt, 1894
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</taxonomicName>
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was regarded as synonymous with
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<taxonomicName authority="Barrande, 1867" authorityName="Barrande" authorityYear="1867" class="Cephalopoda" family="Trocholitidae" genus="Discoceras" higherTaxonomySource="GBIF" kingdom="Animalia" order="Tarphycerida" pageId="70" pageNumber="71" phylum="Mollusca" rank="genus">
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<emphasis box="[1138,1270,1634,1659]" italics="true" pageId="70" pageNumber="71">Discoceras</emphasis>
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Barrande, 1867
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</taxonomicName>
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by
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<bibRefCitation author="Sweet W. C." box="[297,457,1668,1695]" pageId="70" pageNumber="71" pagination="1 - 178" refId="ref49551" refString="Sweet W. C. 1958. The Middle Ordovician of the Oslo region of Norway. 10. Nautiloid cephalopods. Norsk Geologiske Tidsskrift 31: 1 - 178." type="journal article" year="1958">Sweet (1958)</bibRefCitation>
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and
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<bibRefCitation author="Furnish W. M. & Glenister B. F." box="[519,865,1668,1695]" pageId="70" pageNumber="71" pagination="368" refId="ref47896" refString="Furnish W. M. & Glenister B. F. 1964 b. Nautiloidea-Tarphycerida. In: Teichert C. (ed.) Treatise on Invertebrate Paleontology, Part K, Mollusca 3. K 343 - K 368. Geological Society of America and the University of Kansas Press, Boulder, Colorado." type="book chapter" year="1964">Furnish & Glenister (1964b)</bibRefCitation>
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. In the opinion of these authors,
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<taxonomicName authorityName="Barrande" authorityYear="1867" box="[1266,1398,1669,1694]" class="Cephalopoda" family="Trocholitidae" genus="Discoceras" higherTaxonomySource="GBIF" kingdom="Animalia" order="Tarphycerida" pageId="70" pageNumber="71" phylum="Mollusca" rank="genus">
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<emphasis box="[1266,1398,1669,1694]" italics="true" pageId="70" pageNumber="71">Discoceras</emphasis>
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</taxonomicName>
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included strongly annulated forms such as the
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<typeStatus box="[753,804,1704,1730]" pageId="70" pageNumber="71">type</typeStatus>
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of
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<taxonomicName authorityName="Barrande" authorityYear="1867" box="[848,980,1705,1730]" class="Cephalopoda" family="Trocholitidae" genus="Discoceras" higherTaxonomySource="GBIF" kingdom="Animalia" order="Tarphycerida" pageId="70" pageNumber="71" phylum="Mollusca" rank="genus">
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<emphasis box="[848,980,1705,1730]" italics="true" pageId="70" pageNumber="71">Discoceras</emphasis>
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</taxonomicName>
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,
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<taxonomicName authority="Eichwald, 1842" authorityName="Eichwald" authorityYear="1842" class="Mammalia" family="Delphinidae" genus="Clymenia" higherTaxonomySource="CoL" kingdom="Animalia" order="Cetacea" pageId="70" pageNumber="71" phylum="Chordata" rank="species" species="antiquissima">
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<emphasis box="[998,1270,1704,1730]" italics="true" pageId="70" pageNumber="71">Clymenia antiquissima</emphasis>
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<bibRefCitation author="Eichwald E. de" pageId="70" pageNumber="71" refId="ref47193" refString="Eichwald E. de. 1842. Die Urwelt Russlands durch Abbildungen erlaeutert. 2. Heft. Neuer Beitrag zur Geognosie Esthlands und Finlands. Akademie der Wissenschaften, St. Petersburg." type="book" year="1842">Eichwald, 1842</bibRefCitation>
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</taxonomicName>
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, as well as smooth conchs such as
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<taxonomicName authority="Saemann, 1852" authorityName="Saemann" authorityYear="1852" box="[653,1052,1739,1766]" class="Cephalopoda" family="Lituitidae" genus="Lituites" higherTaxonomySource="GBIF" kingdom="Animalia" order="Tarphycerida" pageId="70" pageNumber="71" phylum="Mollusca" rank="species" species="angulatus">
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<emphasis box="[653,864,1739,1765]" italics="true" pageId="70" pageNumber="71">Lituites angulatus</emphasis>
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Saemann, 1852
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</taxonomicName>
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, the
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<typeStatus box="[1106,1157,1739,1765]" pageId="70" pageNumber="71">type</typeStatus>
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of
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<taxonomicName authorityName="Hyatt" authorityYear="1894" box="[1195,1392,1739,1765]" class="Cephalopoda" family="Trocholitidae" genus="Schroederoceras" higherTaxonomySource="GBIF" kingdom="Animalia" order="Tarphycerida" pageId="70" pageNumber="71" phylum="Mollusca" rank="genus">
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<emphasis box="[1195,1392,1739,1765]" italics="true" pageId="70" pageNumber="71">Schroederoceras</emphasis>
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</taxonomicName>
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. Because several species show transitional morphologies from weakly ornamented to strongly annulate,
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<taxonomicName authorityName="Hyatt" authorityYear="1894" box="[189,386,1809,1835]" class="Cephalopoda" family="Trocholitidae" genus="Schroederoceras" higherTaxonomySource="GBIF" kingdom="Animalia" order="Tarphycerida" pageId="70" pageNumber="71" phylum="Mollusca" rank="genus">
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<emphasis box="[189,386,1809,1835]" italics="true" pageId="70" pageNumber="71">Schroederoceras</emphasis>
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</taxonomicName>
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and
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<taxonomicName authorityName="Barrande" authorityYear="1867" box="[444,576,1810,1835]" class="Cephalopoda" family="Trocholitidae" genus="Discoceras" higherTaxonomySource="GBIF" kingdom="Animalia" order="Tarphycerida" pageId="70" pageNumber="71" phylum="Mollusca" rank="genus">
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<emphasis box="[444,576,1810,1835]" italics="true" pageId="70" pageNumber="71">Discoceras</emphasis>
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</taxonomicName>
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are often difficult to distinguish and the position advocated by
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<bibRefCitation author="Sweet W. C." pageId="70" pageNumber="71" pagination="1 - 178" refId="ref49551" refString="Sweet W. C. 1958. The Middle Ordovician of the Oslo region of Norway. 10. Nautiloid cephalopods. Norsk Geologiske Tidsskrift 31: 1 - 178." type="journal article" year="1958">Sweet (1958)</bibRefCitation>
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, who discussed this issue in detail, is followed herein.
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<bibRefCitation author="Stumbur H." box="[949,1139,1844,1871]" pageId="70" pageNumber="71" pagination="131 - 147" refId="ref49380" refString="Stumbur H. 1962. Rasprostranenie nautiloidei v ordovike Estonii (s opisaniem nekotorykh novykh rodov). ENSV Teaduste Akadeemia Geoloogia Instituudi Uurimused 10: 131 - 147." type="journal article" year="1962">Stumbur (1962)</bibRefCitation>
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distinguished groups of discoceratids by their conch cross section and erected new generic names. However,
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<bibRefCitation author="Dzik J." box="[1253,1398,1880,1906]" pageId="70" pageNumber="71" refId="ref47068" refString="Dzik J. 1984. Phylogeny of the Nautiloidea. Palaeontologia Polonica, Vol. 45, 203 pp." type="book" year="1984">Dzik (1984)</bibRefCitation>
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already pointed out that the variation between the different shapes is continuous and sometimes changes within single specimens. Based on the known variability of the material from the Boda Limestone, it is impossible to distinguish different genera by conch cross section alone.
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</paragraph>
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</subSubSection>
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</treatment>
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</document> |