256 lines
31 KiB
XML
256 lines
31 KiB
XML
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<mods:title id="53CE706DC0D056CA9745FE28F1BE9DED">The cephalopods of the Boda Limestone, Late Ordovician, of Dalarna, Sweden</mods:title>
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<mods:namePart id="EF2FD174F2B0F0E37381C69A8389A119">Kröger, Björn</mods:namePart>
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<mods:title id="817EEA19BF632C12ABE60E9F05D7FED4">European Journal of Taxonomy</mods:title>
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<mods:date id="5FD32D9136F11EE3727C2A43EB3A1052">2013</mods:date>
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<treatment id="AD4D9054CD596A58F3904621FDB6FA67" ID-DOI="http://doi.org/10.5281/zenodo.3815210" ID-GBIF-Taxon="163977255" ID-Zenodo-Dep="3815210" LSID="urn:lsid:plazi:treatment:AD4D9054CD596A58F3904621FDB6FA67" httpUri="http://treatment.plazi.org/id/AD4D9054CD596A58F3904621FDB6FA67" lastPageId="62" lastPageNumber="63" pageId="61" pageNumber="62">
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<subSubSection id="6DFE72C9CD596A5BF3904621FBE6FE9B" box="[496,1091,267,294]" pageId="61" pageNumber="62" type="nomenclature">
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<paragraph id="255B2142CD596A5BF3904621FBE6FE9B" blockId="61.[496,1091,267,329]" box="[496,1091,267,294]" pageId="61" pageNumber="62">
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<heading id="7E13962ECD596A5BF3904621FBE6FE9B" box="[496,1091,267,294]" centered="true" fontSize="11" level="2" pageId="61" pageNumber="62" reason="2">
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<taxonomicName id="E2E45AC1CD596A5BF3904621FC1FFE98" authority="(Strand, 1934)" authorityName="Kröger" authorityYear="2013" baseAuthorityName="Strand" baseAuthorityYear="1934" box="[496,954,267,294]" class="Cephalopoda" family="Proteoceratidae" genus="Isorthoceras" higherTaxonomySource="GBIF" kingdom="Animalia" order="Orthocerida" pageId="61" pageNumber="62" phylum="Mollusca" rank="species" species="heroyense" status="comb. nov.">
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<emphasis id="1790FD50CD596A5BF3904621FCACFE9B" bold="true" box="[496,777,267,294]" italics="true" pageId="61" pageNumber="62">Isorthoceras heroyense</emphasis>
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(
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<bibRefCitation id="41755CB3CD596A5BF1794621FC17FE98" author="Strand T." box="[793,946,267,293]" pageId="61" pageNumber="62" 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="0CA3402BCD596A5BF1A24621FBE6FE9B" box="[962,1091,267,294]" pageId="61" pageNumber="62" 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="6DFE72C9CD596A5BF0A94604FCC9FEF4" box="[713,876,302,329]" pageId="61" pageNumber="62" type="description">
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<paragraph id="255B2142CD596A5BF0A94604FCC9FEF4" blockId="61.[496,1091,267,329]" box="[713,876,302,329]" pageId="61" pageNumber="62">
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<figureCitation id="BDDF3DC7CD596A5BF0A94604FC88FEF4" box="[713,813,302,329]" captionStart="Fig" captionStartId="46.[189,232,1730,1756]" captionTargetBox="[212,1353,451,1667]" captionTargetId="figure@46.[211,1376,451,1689]" captionTargetPageId="46" captionText="Fig. 23. Orthocerida of the Boda Limestone. A. Pleurorthoceras osmundsbergense sp. nov., NRM-PZ Mo 150126, holotype, Osmundsberget. B. Isorthoceras suave (Angelin inAngelin & Lindström, 1880) comb. nov.,PMU26835,Kallholn.C.Isorthocerasjunceum(Hall,1847),PMU26833,Kallholn.D-E.Isorthoceras cf. elongatocinctum (Portlock, 1843), Kallholn. D. PMU 26814, juvenile growth stage. E. PMU 26825, larger specimen with irregularly spaced transverse ornamentation. F. Isorthoceras curvilineatum sp. nov., PMU26787,holotype,Osmundsberget.G.Isorthocerasangelinisp.nov.,PMU26774,holotype,Kallholn. H. Geisonoceras? sp., PMU 26758, Kallholn. I. Isorthoceras heroyense (Strand, 1934) comb. nov., PMU 26831, Kallholn. Scale bars: A = 10 mm; B-I = 10 mm." figureDoi="http://doi.org/10.5281/zenodo.3814271" httpUri="https://zenodo.org/record/3814271/files/figure.png" pageId="61" pageNumber="62">Figs 23I</figureCitation>
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,
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<figureCitation id="BDDF3DC7CD596A5BF1594605FCC9FEF4" box="[825,876,303,329]" captionStart="Fig" captionStartId="61.[189,232,1858,1884]" captionTargetBox="[197,1391,677,1812]" captionTargetId="figure@61.[197,1391,677,1812]" captionTargetPageId="61" captionText="Fig. 28. Color marks in Isorthoceras Flower, 1962, Boda Limestone. Longitudinal striae of varying width occur in several specimen of Isorthoceras; see text for discussion. A. Isorthoceras heroyense (Strand, 1934) comb. nov., PMU 26831, Kallholn. B. Isorthoceras suave (Angelin in Angelin & Lindström, 1880) comb. nov., PMU 26835, Osmundsberget. C. Isorthoceras wahlenbergi Niko, 2008, PMU 26862, Kallholn. Scale bar = 10 mm for all figures." figureDoi="http://doi.org/10.5281/zenodo.3814283" httpUri="https://zenodo.org/record/3814283/files/figure.png" pageId="61" pageNumber="62">28A</figureCitation>
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</paragraph>
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</subSubSection>
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<subSubSection id="6DFE72C9CD596A5BF2DD465AFCEEFE37" box="[189,843,367,395]" pageId="61" pageNumber="62" type="reference_group">
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<paragraph id="255B2142CD596A5BF2DD465AFCEEFE37" blockId="61.[189,843,367,395]" box="[189,843,367,395]" pageId="61" pageNumber="62">
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<treatmentCitationGroup id="05F4066CCD596A5BF2DD465AFCEEFE37" box="[189,843,367,395]" pageId="61" pageNumber="62">
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<treatmentCitation id="A4450753CD596A5BF2DD465AFD0DFE36" author="Strand T." box="[189,680,367,395]" page="15" pageId="61" pageNumber="62" year="1934">
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<taxonomicName id="E2E45AC1CD596A5BF2DD465AFD0DFE36" authority="Strand, 1934: 15" authorityName="Strand" authorityYear="1934" box="[189,680,367,395]" class="Cephalopoda" family="Geisonoceratidae" genus="Geisonoceras" higherTaxonomySource="GBIF" kingdom="Animalia" order="Orthocerida" pageId="61" pageNumber="105" phylum="Mollusca" rank="species" species="heroyense">
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<emphasis id="1790FD50CD596A5BF2DD465AFE78FE37" box="[189,477,367,394]" italics="true" pageId="61" pageNumber="62">Geisonoceras herØyense</emphasis>
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<bibRefCitation id="41755CB3CD596A5BF384465AFD0DFE36" author="Strand T." box="[484,680,368,395]" pageId="61" pageNumber="62" 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: 15</bibRefCitation>
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</taxonomicName>
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</treatmentCitation>
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, pl. 3; fig. 16.
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</treatmentCitationGroup>
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</paragraph>
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</subSubSection>
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<subSubSection id="6DFE72C9CD596A5BF2DD469BFC52FDD9" pageId="61" pageNumber="62" type="diagnosis">
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<paragraph id="255B2142CD596A5BF2DD469BFE93FE76" blockId="61.[189,310,433,459]" box="[189,310,433,459]" pageId="61" pageNumber="62">
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||
<heading id="7E13962ECD596A5BF2DD469BFE93FE76" bold="true" box="[189,310,433,459]" fontSize="11" level="3" pageId="61" pageNumber="62" reason="3">
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<emphasis id="1790FD50CD596A5BF2DD469BFE93FE76" bold="true" box="[189,310,433,459]" pageId="61" pageNumber="62">Diagnosis</emphasis>
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</heading>
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</paragraph>
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<paragraph id="255B2142CD596A5BF2DD46CAFC52FDD9" blockId="61.[189,1399,480,612]" pageId="61" pageNumber="62">
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Transversally ornamented, straight
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<taxonomicName id="E2E45AC1CD596A5BF03746CAFD4EFE47" authorityName="Flower" authorityYear="1962" box="[599,747,480,506]" class="Cephalopoda" family="Proteoceratidae" genus="Isorthoceras" higherTaxonomySource="GBIF" kingdom="Animalia" order="Orthocerida" pageId="61" pageNumber="62" phylum="Mollusca" rank="genus">
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<emphasis id="1790FD50CD596A5BF03746CAFD4EFE47" box="[599,747,480,506]" italics="true" pageId="61" pageNumber="62">Isorthoceras</emphasis>
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</taxonomicName>
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with circular cross section and comparatively low angle of expansion of ca. 5°, chamber distance 0.5 of corresponding cross section; transverse ornamentation consists of rounded, sharp, raised lirae, with distance of ca. six per millimetre; siphuncle eccentric with diameter ca. 0.13 of conch cross section. (Adopted from
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<bibRefCitation id="41755CB3CD596A5BF1374563FC4FFDD9" author="Strand T." box="[855,1002,585,612]" pageId="61" pageNumber="62" 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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</paragraph>
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||
</subSubSection>
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||
<caption id="719B71CACD596A5BF2DD4068FAE2F854" ID-DOI="http://doi.org/10.5281/zenodo.3814283" ID-Zenodo-Dep="3814283" httpUri="https://zenodo.org/record/3814283/files/figure.png" pageId="61" pageNumber="62" startId="61.[189,232,1858,1884]" targetBox="[197,1391,677,1812]" targetPageId="61">
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||
<paragraph id="255B2142CD596A5BF2DD4068FAE2F854" blockId="61.[189,1399,1858,2026]" pageId="61" pageNumber="62">
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<emphasis id="1790FD50CD596A5BF2DD4068FE8CF8E1" bold="true" box="[189,297,1858,1884]" pageId="61" pageNumber="62">Fig. 28.</emphasis>
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Color marks in
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<taxonomicName id="E2E45AC1CD596A5BF0454069FCDBF8E1" authority="Flower, 1962" authorityName="Flower" authorityYear="1962" box="[549,894,1858,1885]" class="Cephalopoda" family="Proteoceratidae" genus="Isorthoceras" higherTaxonomySource="GBIF" kingdom="Animalia" order="Orthocerida" pageId="61" pageNumber="62" phylum="Mollusca" rank="genus">
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<emphasis id="1790FD50CD596A5BF0454069FD1CF8E0" box="[549,697,1859,1885]" italics="true" pageId="61" pageNumber="62">Isorthoceras</emphasis>
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||
<bibRefCitation id="41755CB3CD596A5BF0B14069FCDBF8E1" author="Flower R. H." box="[721,894,1858,1885]" pageId="61" pageNumber="62" pagination="1 - 58" refId="ref47454" refString="Flower R. H. 1962. Part 1, Revision of Buttsoceras. Part 2, Notes on the Michelinoceratida. State Bureau of Mines and Mineral Resources, New Mexico Institute of Mining and Technology, Memoir 10: 1 - 58." type="journal article" year="1962">Flower, 1962</bibRefCitation>
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</taxonomicName>
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, Boda Limestone. Longitudinal striae of varying width occur in several specimen of
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<taxonomicName id="E2E45AC1CD596A5BF138404CFC49F83D" authorityName="Flower" authorityYear="1962" box="[856,1004,1894,1920]" class="Cephalopoda" family="Proteoceratidae" genus="Isorthoceras" higherTaxonomySource="GBIF" kingdom="Animalia" order="Orthocerida" pageId="61" pageNumber="62" phylum="Mollusca" rank="genus">
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<emphasis id="1790FD50CD596A5BF138404CFC49F83D" box="[856,1004,1894,1920]" italics="true" pageId="61" pageNumber="62">Isorthoceras</emphasis>
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</taxonomicName>
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; see text for discussion.
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<emphasis id="1790FD50CD596A5BF73A404CFACAF83D" bold="true" box="[1370,1391,1894,1920]" pageId="61" pageNumber="62">A</emphasis>
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.
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<taxonomicName id="E2E45AC1CD596A5BF2DD40A3FD09F81E" authority="(Strand, 1934)" authorityName="Kröger" authorityYear="2013" baseAuthorityName="Strand" baseAuthorityYear="1934" box="[189,684,1929,1955]" class="Cephalopoda" family="Proteoceratidae" genus="Isorthoceras" higherTaxonomySource="GBIF" kingdom="Animalia" order="Orthocerida" pageId="61" pageNumber="62" phylum="Mollusca" rank="species" species="heroyense" status="comb. nov.">
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<emphasis id="1790FD50CD596A5BF2DD40A3FE7BF81E" box="[189,478,1929,1955]" italics="true" pageId="61" pageNumber="62">Isorthoceras heroyense</emphasis>
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(
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<bibRefCitation id="41755CB3CD596A5BF39C40A3FD01F81E" author="Strand T." box="[508,676,1929,1955]" pageId="61" pageNumber="62" 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="0CA3402BCD596A5BF0A240A3FCF0F819" box="[706,853,1929,1956]" pageId="61" pageNumber="62" rank="species">comb. nov.</taxonomicNameLabel>
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, PMU 26831, Kallholn.
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<emphasis id="1790FD50CD596A5BF6D140A3FB60F81E" bold="true" box="[1201,1221,1929,1955]" pageId="61" pageNumber="62">B</emphasis>
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.
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<taxonomicName id="E2E45AC1CD596A5BF68240A3FC9FF87B" authority="(Angelin in Angelin & Lindstrom, 1880)" authorityName="Kröger" authorityYear="2013" baseAuthorityName="Angelin in Angelin & Lindstrom" baseAuthorityYear="1880" class="Cephalopoda" family="Proteoceratidae" genus="Isorthoceras" higherTaxonomySource="GBIF" kingdom="Animalia" order="Orthocerida" pageId="61" pageNumber="62" phylum="Mollusca" rank="species" species="suave" status="comb. nov.">
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<emphasis id="1790FD50CD596A5BF68240A3FEA5F87B" italics="true" pageId="61" pageNumber="62">Isorthoceras suave</emphasis>
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(Angelin
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<emphasis id="1790FD50CD596A5BF3F34087FE0FF87B" box="[403,426,1965,1990]" italics="true" pageId="61" pageNumber="62">in</emphasis>
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<bibRefCitation id="41755CB3CD596A5BF3DE4086FC97F87B" author="Angelin N. P. & Lindstrom G." box="[446,818,1964,1990]" pageId="61" pageNumber="62" refId="ref46414" refString="Angelin N. P. & Lindstrom G. 1880. Fragmenta Silurica. Samson and Wallin, Stockholm." type="book" year="1880">Angelin & Lindström, 1880</bibRefCitation>
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)
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</taxonomicName>
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<taxonomicNameLabel id="0CA3402BCD596A5BF1304086FC47F87A" box="[848,994,1964,1991]" pageId="61" pageNumber="62" rank="species">comb. nov.</taxonomicNameLabel>
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, PMU 26835, Osmundsberget.
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<emphasis id="1790FD50CD596A5BF2DD40E5FF77F854" bold="true" box="[189,210,1999,2025]" pageId="61" pageNumber="62">C</emphasis>
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.
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<taxonomicName id="E2E45AC1CD596A5BF28140E5FD38F857" authority="Niko, 2008" authorityName="Niko" authorityYear="2008" box="[225,669,1999,2026]" class="Cephalopoda" family="Proteoceratidae" genus="Isorthoceras" higherTaxonomySource="GBIF" kingdom="Animalia" order="Orthocerida" pageId="61" pageNumber="62" phylum="Mollusca" rank="species" species="wahlenbergi">
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<emphasis id="1790FD50CD596A5BF28140E5FDABF854" box="[225,526,1999,2025]" italics="true" pageId="61" pageNumber="62">Isorthoceras wahlenbergi</emphasis>
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Niko, 2008
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</taxonomicName>
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, PMU 26862, Kallholn. Scale bar = 10 mm for all figures.
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</paragraph>
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</caption>
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<subSubSection id="6DFE72C9CD5A6A58F2DD4621FD2CFDB7" pageId="62" pageNumber="63" type="materials_examined">
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||
<paragraph id="255B2142CD5A6A58F2DD4621FE5EFE98" blockId="62.[189,507,267,293]" box="[189,507,267,293]" pageId="62" pageNumber="63">
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||
<heading id="7E13962ECD5A6A58F2DD4621FE5EFE98" bold="true" box="[189,507,267,293]" fontSize="11" level="3" pageId="62" pageNumber="63" reason="3">
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||
<emphasis id="1790FD50CD5A6A58F2DD4621FE5EFE98" bold="true" box="[189,507,267,293]" pageId="62" pageNumber="63">
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||
<typeStatus id="FA5F9FE0CD5A6A58F2DD4621FF5FFE98" box="[189,250,267,293]" pageId="62" pageNumber="63">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="255B2142CD5A6A58F2DD4610FEECFECB" blockId="62.[189,1398,313,374]" pageId="62" pageNumber="63">
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Herøya near Porsgrunn,
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<collectingCountry id="5DF361D2CD5A6A58F3944610FDF3FEE9" box="[500,598,314,340]" name="Norway" pageId="62" pageNumber="63">Norway</collectingCountry>
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; Herøya Formation (“Gastropod Limestone”), late Katian, Late Ordovician.
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</paragraph>
|
||
<paragraph id="255B2142CD5A6A58F2DD46B4FE8FFE05" blockId="62.[189,298,414,440]" box="[189,298,414,440]" pageId="62" pageNumber="63">
|
||
<heading id="7E13962ECD5A6A58F2DD46B4FE8FFE05" bold="true" box="[189,298,414,440]" fontSize="11" level="3" pageId="62" pageNumber="63" reason="3">
|
||
<emphasis id="1790FD50CD5A6A58F2DD46B4FE8FFE05" bold="true" box="[189,298,414,440]" pageId="62" pageNumber="63">Material</emphasis>
|
||
</heading>
|
||
</paragraph>
|
||
<paragraph id="255B2142CD5A6A58F2DD46E7FD2CFDB7" blockId="62.[189,1398,460,522]" pageId="62" pageNumber="63">
|
||
Two specimens (
|
||
<collectionCode id="43F5B987CD5A6A58F3E546E7FE62FE5A" box="[389,455,461,487]" country="Sweden" httpUri="http://grbio.org/cool/32ji-dbbk" name="Paleontological Museum of Uppsala" pageId="62" pageNumber="63">PMU</collectionCode>
|
||
26831, 26832) from Kallholn, Siljan District,
|
||
<collectingCountry id="5DF361D2CD5A6A58F19746E6FBFDFE5B" box="[1015,1112,460,486]" name="Sweden" pageId="62" pageNumber="63">Sweden</collectingCountry>
|
||
; Boda Limestone, Boda Core Member, late Katian, Ordovician.
|
||
</paragraph>
|
||
</subSubSection>
|
||
<subSubSection id="6DFE72C9CD5A6A58F2DD451BFC6DFCCD" pageId="62" pageNumber="63" type="description">
|
||
<paragraph id="255B2142CD5A6A58F2DD451BFEEBFDF6" blockId="62.[189,334,561,587]" box="[189,334,561,587]" pageId="62" pageNumber="63">
|
||
<heading id="7E13962ECD5A6A58F2DD451BFEEBFDF6" bold="true" box="[189,334,561,587]" fontSize="11" level="3" pageId="62" pageNumber="63" reason="3">
|
||
<emphasis id="1790FD50CD5A6A58F2DD451BFEEBFDF6" bold="true" box="[189,334,561,587]" pageId="62" pageNumber="63">Description</emphasis>
|
||
</heading>
|
||
</paragraph>
|
||
<paragraph id="255B2142CD5A6A58F2DD454AFC6DFCCD" blockId="62.[189,1399,608,881]" pageId="62" pageNumber="63">
|
||
Specimen PMU 26831 is a fragment of a body chamber with a length of
|
||
<quantity id="E21C8CA7CD5A6A58F660454AFBF7FDC7" box="[1024,1106,608,635]" metricMagnitude="-2" metricUnit="m" metricValue="3.5" pageId="62" pageNumber="63" unit="mm" value="35.0">35 mm</quantity>
|
||
and a diameter of
|
||
<quantity id="E21C8CA7CD5A6A58F746454AFF4EFD20" metricMagnitude="-2" metricUnit="m" metricValue="1.06" metricValueMax="1.2" metricValueMin="0.9199999999999999" pageId="62" pageNumber="63" unit="mm" value="10.6" valueMax="12.0" valueMin="9.2">9.2–12 mm</quantity>
|
||
(angle of expansion 4.5°) (
|
||
<figureCitation id="BDDF3DC7CD5A6A58F04645A9FD2FFD20" box="[550,650,643,669]" captionStart="Fig" captionStartId="46.[189,232,1730,1756]" captionTargetBox="[212,1353,451,1667]" captionTargetId="figure@46.[211,1376,451,1689]" captionTargetPageId="46" captionText="Fig. 23. Orthocerida of the Boda Limestone. A. Pleurorthoceras osmundsbergense sp. nov., NRM-PZ Mo 150126, holotype, Osmundsberget. B. Isorthoceras suave (Angelin inAngelin & Lindström, 1880) comb. nov.,PMU26835,Kallholn.C.Isorthocerasjunceum(Hall,1847),PMU26833,Kallholn.D-E.Isorthoceras cf. elongatocinctum (Portlock, 1843), Kallholn. D. PMU 26814, juvenile growth stage. E. PMU 26825, larger specimen with irregularly spaced transverse ornamentation. F. Isorthoceras curvilineatum sp. nov., PMU26787,holotype,Osmundsberget.G.Isorthocerasangelinisp.nov.,PMU26774,holotype,Kallholn. H. Geisonoceras? sp., PMU 26758, Kallholn. I. Isorthoceras heroyense (Strand, 1934) comb. nov., PMU 26831, Kallholn. Scale bars: A = 10 mm; B-I = 10 mm." figureDoi="http://doi.org/10.5281/zenodo.3814271" httpUri="https://zenodo.org/record/3814271/files/figure.png" pageId="62" pageNumber="63">Figs 23I</figureCitation>
|
||
,
|
||
<figureCitation id="BDDF3DC7CD5A6A58F0F645A9FD68FD20" box="[662,717,643,669]" captionStart="Fig" captionStartId="61.[189,232,1858,1884]" captionTargetBox="[197,1391,677,1812]" captionTargetId="figure@61.[197,1391,677,1812]" captionTargetPageId="61" captionText="Fig. 28. Color marks in Isorthoceras Flower, 1962, Boda Limestone. Longitudinal striae of varying width occur in several specimen of Isorthoceras; see text for discussion. A. Isorthoceras heroyense (Strand, 1934) comb. nov., PMU 26831, Kallholn. B. Isorthoceras suave (Angelin in Angelin & Lindström, 1880) comb. nov., PMU 26835, Osmundsberget. C. Isorthoceras wahlenbergi Niko, 2008, PMU 26862, Kallholn. Scale bar = 10 mm for all figures." figureDoi="http://doi.org/10.5281/zenodo.3814283" httpUri="https://zenodo.org/record/3814283/files/figure.png" pageId="62" pageNumber="63">28A</figureCitation>
|
||
). The basal septum of the body chamber is preserved, with a convexity of ca.
|
||
<quantity id="E21C8CA7CD5A6A58F3EF458CFE77FD7C" box="[399,466,678,705]" metricMagnitude="-3" metricUnit="m" metricValue="3.0" pageId="62" pageNumber="63" unit="mm" value="3.0">3 mm</quantity>
|
||
and a septal perforation with a diameter of
|
||
<quantity id="E21C8CA7CD5A6A58F1A5458CFBB8FD7C" box="[965,1053,678,705]" metricMagnitude="-3" metricUnit="m" metricValue="1.5" pageId="62" pageNumber="63" unit="mm" value="1.5">1.5 mm</quantity>
|
||
(0.16 of conch cross section). The siphuncle is positioned
|
||
<quantity id="E21C8CA7CD5A6A58F06845E3FDC6FD59" box="[520,611,713,740]" metricMagnitude="-3" metricUnit="m" metricValue="2.3" pageId="62" pageNumber="63" unit="mm" value="2.3">2.3 mm</quantity>
|
||
from the conch margin (SPR 0.25). The conch is ornamented with fine transverse lirae, ca. six in a distance of one millimetre, which are slightly oblique, projecting adorally on the prosiphuncular side of the conch and forming shallow and wide sinus on the antisiphuncular side. Around the circumference several brown bands are preserved (
|
||
<figureCitation id="BDDF3DC7CD5A6A58F1D44419FB80FCF0" box="[948,1061,819,845]" captionStart="Fig" captionStartId="61.[189,232,1858,1884]" captionTargetBox="[197,1391,677,1812]" captionTargetId="figure@61.[197,1391,677,1812]" captionTargetPageId="61" captionText="Fig. 28. Color marks in Isorthoceras Flower, 1962, Boda Limestone. Longitudinal striae of varying width occur in several specimen of Isorthoceras; see text for discussion. A. Isorthoceras heroyense (Strand, 1934) comb. nov., PMU 26831, Kallholn. B. Isorthoceras suave (Angelin in Angelin & Lindström, 1880) comb. nov., PMU 26835, Osmundsberget. C. Isorthoceras wahlenbergi Niko, 2008, PMU 26862, Kallholn. Scale bar = 10 mm for all figures." figureDoi="http://doi.org/10.5281/zenodo.3814283" httpUri="https://zenodo.org/record/3814283/files/figure.png" pageId="62" pageNumber="63">Fig. 28A</figureCitation>
|
||
). The bands are ca.
|
||
<quantity id="E21C8CA7CD5A6A58F77A4419FAD2FCF0" box="[1306,1399,819,846]" metricMagnitude="-4" metricUnit="m" metricValue="5.0" pageId="62" pageNumber="63" unit="mm" value="0.5">0.5 mm</quantity>
|
||
wide; a number of 28 would occur around the total circumference.
|
||
</paragraph>
|
||
</subSubSection>
|
||
<subSubSection id="6DFE72C9CD5A6A58F2DD44B2FC54FA99" pageId="62" pageNumber="63" type="discussion">
|
||
<paragraph id="255B2142CD5A6A58F2DD44B2FE8AFC0F" blockId="62.[189,303,920,946]" box="[189,303,920,946]" pageId="62" pageNumber="63">
|
||
<heading id="7E13962ECD5A6A58F2DD44B2FE8AFC0F" bold="true" box="[189,303,920,946]" fontSize="11" level="3" pageId="62" pageNumber="63" reason="3">
|
||
<emphasis id="1790FD50CD5A6A58F2DD44B2FE8AFC0F" bold="true" box="[189,303,920,946]" pageId="62" pageNumber="63">Remarks</emphasis>
|
||
</heading>
|
||
</paragraph>
|
||
<paragraph id="255B2142CD5A6A58F2DD44ECFDABFBF7" blockId="62.[189,1399,966,1098]" pageId="62" pageNumber="63">
|
||
This species is assigned to
|
||
<taxonomicName id="E2E45AC1CD5A6A58F06B44ECFD3AFC5D" authorityName="Flower" authorityYear="1962" box="[523,671,966,992]" class="Cephalopoda" family="Proteoceratidae" genus="Isorthoceras" higherTaxonomySource="GBIF" kingdom="Animalia" order="Orthocerida" pageId="62" pageNumber="63" phylum="Mollusca" rank="genus">
|
||
<emphasis id="1790FD50CD5A6A58F06B44ECFD3AFC5D" box="[523,671,966,992]" italics="true" pageId="62" pageNumber="63">Isorthoceras</emphasis>
|
||
</taxonomicName>
|
||
on the basis of the general similarity of the external conch characters to those of other species of this genus. Nothing is known about the adult size of this species, but the decreased angle of expansion of the two specimens from the Boda Limestone suggest an adult size of no more than
|
||
<quantity id="E21C8CA7CD5A6A58F3D44305FDACFBF7" box="[436,521,1071,1098]" metricMagnitude="-2" metricUnit="m" metricValue="1.5" pageId="62" pageNumber="63" unit="mm" value="15.0">15 mm</quantity>
|
||
.
|
||
</paragraph>
|
||
<paragraph id="255B2142CD5A6A58F2DD435BFEFDFB36" blockId="62.[189,344,1137,1163]" box="[189,344,1137,1163]" pageId="62" pageNumber="63">
|
||
<heading id="7E13962ECD5A6A58F2DD435BFEFDFB36" bold="true" box="[189,344,1137,1163]" fontSize="11" level="3" pageId="62" pageNumber="63" reason="3">
|
||
<emphasis id="1790FD50CD5A6A58F2DD435BFEFDFB36" bold="true" box="[189,344,1137,1163]" pageId="62" pageNumber="63">Comparison</emphasis>
|
||
</heading>
|
||
</paragraph>
|
||
<paragraph id="255B2142CD5A6A58F2DD438AFC54FA99" blockId="62.[189,1399,1184,1316]" pageId="62" pageNumber="63">
|
||
This species is most similar to
|
||
<taxonomicName id="E2E45AC1CD5A6A58F045438BFC93FB07" authority="(Hall, 1847)" baseAuthorityName="Hall" baseAuthorityYear="1847" box="[549,822,1184,1210]" class="Cephalopoda" family="Proteoceratidae" genus="Isorthoceras" higherTaxonomySource="GBIF" kingdom="Animalia" order="Orthocerida" pageId="62" pageNumber="63" phylum="Mollusca" rank="species" species="junceum">
|
||
<emphasis id="1790FD50CD5A6A58F045438BFD8AFB07" box="[549,559,1185,1210]" italics="true" pageId="62" pageNumber="63">I</emphasis>
|
||
.
|
||
<emphasis id="1790FD50CD5A6A58F05D438BFD05FB07" box="[573,672,1185,1210]" italics="true" pageId="62" pageNumber="63">junceum</emphasis>
|
||
(
|
||
<bibRefCitation id="41755CB3CD5A6A58F0D0438AFC8BFB07" author="Hall J." box="[688,814,1184,1210]" pageId="62" pageNumber="63" refId="ref48004" refString="Hall J. 1847. Natural History of New York, Paleontology, Volume 1, containing Descriptions of the Organic Remains of the Lower Division of the New-York System (Equivalent of the Lower Silurian Rocks of Europe). Van Benthuysen, Albany, New York." type="book" year="1847">Hall, 1847</bibRefCitation>
|
||
)
|
||
</taxonomicName>
|
||
with respect to the transverse ornamentation, but differs in having more widely spaced transverse striae (six per millimetre in
|
||
<taxonomicName id="E2E45AC1CD5A6A58F65043EEFB1BFB60" authorityName="Kröger" authorityYear="2013" baseAuthorityName="Strand" baseAuthorityYear="1934" box="[1072,1214,1219,1245]" class="Cephalopoda" family="Proteoceratidae" genus="Isorthoceras" higherTaxonomySource="GBIF" kingdom="Animalia" order="Orthocerida" pageId="62" pageNumber="63" phylum="Mollusca" rank="species" species="heroyense" status="comb. nov.">
|
||
<emphasis id="1790FD50CD5A6A58F65043EEFB9FFB60" box="[1072,1082,1220,1245]" italics="true" pageId="62" pageNumber="63">I</emphasis>
|
||
.
|
||
<emphasis id="1790FD50CD5A6A58F62843E9FB1BFB60" box="[1096,1214,1219,1245]" italics="true" pageId="62" pageNumber="63">heroyense</emphasis>
|
||
</taxonomicName>
|
||
<taxonomicNameLabel id="0CA3402BCD5A6A58F6A443E9FAEDFB60" box="[1220,1352,1219,1245]" pageId="62" pageNumber="63" rank="species">comb. nov.</taxonomicNameLabel>
|
||
; ten per millimetre in
|
||
<taxonomicName id="E2E45AC1CD5A6A58F3EB43CDFDADFABD" baseAuthorityName="Hall" baseAuthorityYear="1847" box="[395,520,1255,1281]" class="Cephalopoda" family="Proteoceratidae" genus="Isorthoceras" higherTaxonomySource="GBIF" kingdom="Animalia" order="Orthocerida" pageId="62" pageNumber="63" phylum="Mollusca" rank="species" species="junceum">
|
||
<emphasis id="1790FD50CD5A6A58F3EB43CDFE30FABD" box="[395,405,1255,1280]" italics="true" pageId="62" pageNumber="63">I</emphasis>
|
||
.
|
||
<emphasis id="1790FD50CD5A6A58F3C543CDFDADFABD" box="[421,520,1255,1280]" italics="true" pageId="62" pageNumber="63">junceum</emphasis>
|
||
</taxonomicName>
|
||
) and a higher angle of expansion at similar conch diameters. The strongly eccentric siphuncle is unique amongst known species of
|
||
<taxonomicName id="E2E45AC1CD5A6A58F1364223FC4FFA9E" authorityName="Flower" authorityYear="1962" box="[854,1002,1289,1315]" class="Cephalopoda" family="Proteoceratidae" genus="Isorthoceras" higherTaxonomySource="GBIF" kingdom="Animalia" order="Orthocerida" pageId="62" pageNumber="63" phylum="Mollusca" rank="genus">
|
||
<emphasis id="1790FD50CD5A6A58F1364223FC4FFA9E" box="[854,1002,1289,1315]" italics="true" pageId="62" pageNumber="63">Isorthoceras</emphasis>
|
||
</taxonomicName>
|
||
.
|
||
</paragraph>
|
||
</subSubSection>
|
||
<subSubSection id="6DFE72C9CD5A6A58F2DD4260FDB6FA67" pageId="62" pageNumber="63" type="multiple">
|
||
<paragraph id="255B2142CD5A6A58F2DD4260FDD8FAD8" blockId="62.[189,637,1354,1381]" box="[189,637,1354,1381]" pageId="62" pageNumber="63">
|
||
<heading id="7E13962ECD5A6A58F2DD4260FDD8FAD8" bold="true" box="[189,637,1354,1381]" fontSize="11" level="3" pageId="62" pageNumber="63" reason="3">
|
||
<emphasis id="1790FD50CD5A6A58F2DD4260FDD8FAD8" bold="true" box="[189,637,1354,1381]" pageId="62" pageNumber="63">Stratigraphic and geographic range</emphasis>
|
||
</heading>
|
||
</paragraph>
|
||
<paragraph id="255B2142CD5A6A58F2DD4250FDB6FA67" blockId="62.[189,1398,1401,1498]" pageId="62" pageNumber="63">
|
||
Herøya near Porsgrunn,
|
||
<collectingCountry id="5DF361D2CD5A6A58F3964250FDF3FA29" box="[502,598,1402,1428]" name="Norway" pageId="62" pageNumber="63">Norway</collectingCountry>
|
||
, Herøya Formation (“Gastropod Limestone”), Frognøya Island, Ringerike,
|
||
<collectingCountry id="5DF361D2CD5A6A58F32242B7FE07FA0A" box="[322,418,1437,1463]" name="Norway" pageId="62" pageNumber="63">Norway</collectingCountry>
|
||
, Bønsnes Formation (
|
||
<bibRefCitation id="41755CB3CD5A6A58F0CB42B6FCE6FA0A" author="Strand T." box="[683,835,1436,1463]" pageId="62" pageNumber="63" 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>
|
||
); Boda Limestone, Siljan District,
|
||
<collectingCountry id="5DF361D2CD5A6A58F68A42B6FAEEFA0B" box="[1258,1355,1436,1462]" name="Sweden" pageId="62" pageNumber="63">Sweden</collectingCountry>
|
||
; all late Katian, Late Ordovician.
|
||
</paragraph>
|
||
</subSubSection>
|
||
</treatment>
|
||
</document> |