184 lines
24 KiB
XML
184 lines
24 KiB
XML
<document id="8C248573C22FBCE946F8FB485AC2811F" ID-DOI="10.5281/zenodo.4651042" ID-ISSN="1638-9395" ID-Zenodo-Dep="4651042" IM.materialsCitations_approvedBy="felipe" IM.metadata_approvedBy="felipe" IM.tables_requiresApprovalFor="existingObjects,plazi" IM.taxonomicNames_approvedBy="felipe" IM.treatments_approvedBy="felipe" checkinTime="1617194950417" checkinUser="felipe" docAuthor="Cecca, Fabrizio & Savary, Bérengère" docDate="2007" docId="6A5FC8133772BD13FF17F98CC777FA1D" docLanguage="en" docName="Geodiversitas.29.4.507-548.pdf.imf" docOrigin="Geodiversitas 29 (4)" docStyle="DocumentStyle:94524207C6714CF92F879FE43E306202.3:Geodiversitas.2000-2008.journal_article.type2" docStyleId="94524207C6714CF92F879FE43E306202" docStyleName="Geodiversitas.2000-2008.journal_article.type2" docStyleVersion="3" docTitle="Euaspidoceras oegir" docType="treatment" docVersion="6" lastPageNumber="536" masterDocId="9666B06B3769BD0EFFA7FFA6C50FFF9A" masterDocTitle="Palaeontological study of Middle Oxfordian- Early Kimmeridgian (Late Jurassic) ammonites from the Rosso Ammonitico of Monte Inici (north-western Sicily, Italy)" masterLastPageNumber="548" masterPageNumber="507" pageNumber="534" updateTime="1698897436709" updateUser="plazi" zenodo-license-document="CC0-1.0" zenodo-license-figures="CC0-1.0">
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<mods:titleInfo id="4D65D61577CD228E1F9A2F0A7362B6D3">
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<mods:title id="EBBCE056886850B9E922B4D552AFF116">Palaeontological study of Middle Oxfordian- Early Kimmeridgian (Late Jurassic) ammonites from the Rosso Ammonitico of Monte Inici (north-western Sicily, Italy)</mods:title>
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<mods:name id="EC459973CE3138608BC488AC378DDDF4" type="personal">
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<mods:roleTerm id="AD36DD6C1FBD1420844FF9D37D2C6BDB">Author</mods:roleTerm>
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<mods:namePart id="91CB6E44418697AA368A2A4BEB2D2D0C">Cecca, Fabrizio</mods:namePart>
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<mods:affiliation id="07889B0C078CD7680FE473D32876D5A6">Université Pierre et Marie Curie-Paris 6, CNRS-UMR 5143 “ Paléobiodiversité et Paléoenvironnements ”, case 104, 4 place Jussieu, F- 75252 Paris cedex 05 (France) cecca @ ccr. jussieu. fr</mods:affiliation>
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<mods:name id="6E6025AD07FAE0C8F03759BE970CC6E4" type="personal">
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<mods:roleTerm id="C9354C5708D2C81EEEFF14AA1F8764B9">Author</mods:roleTerm>
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<mods:namePart id="3F6ED69EBD77A226BA00D1467E3C4C17">Savary, Bérengère</mods:namePart>
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<mods:affiliation id="147481CD0E992F2AA82C37549C418887">Schlumberger Stavanger Research, Risabergveien 3, Tananger, P. O. Box 8013, N- 4068 Stavanger (Norway) BSavary @ stavanger. oilfield. slb. com</mods:affiliation>
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<mods:typeOfResource id="1CC1D55D2528D0BA61941FE9A65D702C">text</mods:typeOfResource>
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<mods:title id="A9905A1B29E4D85EAE0C84DAEE90A1B2">Geodiversitas</mods:title>
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<mods:part id="9E17BC2B91A4C4CB0BB87FACD69259FC">
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<mods:date id="15E410F733549D28ED7367B74A771778">2007</mods:date>
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<mods:detail id="7E0DD9E2F932860E7392D953CB9B240D" type="volume">
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<mods:number id="BA22EE0371F845F36D1A3ED401126A08">29</mods:number>
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<mods:start id="5773BA7DC928315099F5C4CB3CA927D1">507</mods:start>
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<mods:end id="2E8F57FFB6DA5004106C562A09C9F362">548</mods:end>
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<mods:identifier id="D8CABA67B01A4B0D7AE38602E1EA7A55" type="DOI">10.5281/zenodo.4651042</mods:identifier>
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<mods:identifier id="53DF44E2473C9A1CF10BB0676034CF23" type="ISSN">1638-9395</mods:identifier>
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<treatment id="6A5FC8133772BD13FF17F98CC777FA1D" ID-DOI="http://doi.org/10.5281/zenodo.4650853" ID-Zenodo-Dep="4650853" LSID="urn:lsid:plazi:treatment:6A5FC8133772BD13FF17F98CC777FA1D" httpUri="http://treatment.plazi.org/id/6A5FC8133772BD13FF17F98CC777FA1D" lastPageId="29" lastPageNumber="536" pageId="27" pageNumber="534">
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<subSubSection id="AAEC2A8E3772BD15FF17F98CC4A2F9FE" pageId="27" pageNumber="534" type="nomenclature">
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<paragraph id="E24979053772BD15FF17F98CC4A2F9FE" blockId="27.[176,583,1578,1636]" pageId="27" pageNumber="534">
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<heading id="B901CE693772BD15FF17F98CC4A2F9FE" centered="true" fontSize="11" level="2" pageId="27" pageNumber="534" reason="2">
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<taxonomicName id="25F602863772BD15FF17F98CC748F9DF" ID-CoL="3BN2Q" authority="(Oppel, 1863)" baseAuthorityName="Oppel" baseAuthorityYear="1863" box="[176,583,1578,1605]" class="Cephalopoda" family="Aspidoceratidae" genus="Euaspidoceras" higherTaxonomySource="GBIF" kingdom="Animalia" order="Ammonitida" pageId="27" pageNumber="534" phylum="Mollusca" rank="species" species="oegir">
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<emphasis id="D082A5173772BD15FF17F98CC448F9DF" bold="true" box="[176,327,1578,1605]" italics="true" pageId="27" pageNumber="534">Euaspidoceras</emphasis>
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cf.
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<emphasis id="D082A5173772BD15FED7F98CC4ABF9DE" bold="true" box="[368,420,1578,1604]" italics="true" pageId="27" pageNumber="534">oegir</emphasis>
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(Oppel, 1863)
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</taxonomicName>
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(
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<figureCitation id="7ACD65803772BD15FEF5F9ECC4AAF9FE" box="[338,421,1610,1636]" captionStart="FIG" captionStartId="17.[113,124,1567,1584]" captionText="FIG. 7. — A,?Aspidoceras gr. binodum (Oppel, 1863), specimen MI4N 6f/2 from bed 6f of section Monte Inici East; B, Geyssantia geyssanti Meléndez, 1989, specimen MI4N 8-9/1 from bed 8d of section Monte Inici East; C, Euaspidoceras cf. oegir (Oppel, 1863), entirely septated specimen MI4N 6d/1 from bed 6d of section Monte Inici East; D, Euaspidoceras cf. lytoceroide? (Gemmellaro,1876), specimen MI3 9/9 from bed 9 of section Castello Inici;E, Passendorferia (Enayites) aff.gygii Brochwicz-Lewinski & Rozak, 1976, specimen MI4N 8 “top”/6 from bed 8d of section Monte Inici East; F, Passendorferia (Enayites) cf. rozaki Meléndez, 1989, specimen MI4N 8c/1 from bed 8d top of section Monte Inici East. All figures natural size. Arrows indicate the beginning of the body chamber." pageId="27" pageNumber="534">Fig. 7C</figureCitation>
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)
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</heading>
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</paragraph>
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</subSubSection>
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<subSubSection id="AAEC2A8E3772BD15FFD6F92DC116FE62" pageId="27" pageNumber="534" type="materials_examined">
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<paragraph id="E24979053772BD15FFD6F92DC4E9F938" blockId="27.[113,486,1674,1698]" box="[113,486,1674,1698]" pageId="27" pageNumber="534">MATERIAL EXAMINED. — MI4N 6d/1.</paragraph>
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<paragraph id="E24979053772BD15FD02FF7EC116FE62" blockId="27.[677,1211,215,504]" pageId="27" pageNumber="534">
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STRATIGRAPHIC DISTRIBUTION. — The specimen has been collected in bed 6d of section Monte Inici East, assigned to the Transversarium Zone. According to
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<bibRefCitation id="866704F43772BD15FD02FE81C681FEA5" author="BONNOT A. & GYGI R. A." box="[677,910,294,319]" pageId="27" pageNumber="534" pagination="427 - 445" refId="ref18257" refString="BONNOT A. & GYGI R. A. 2001. - Les Euaspidoceratinae (Ammonitina, Aspidoceratidae) de la Zone a Transversarium (Oxfordien moyen) de Suisse septentrionale (cantons d'Argovie et de Schaffhouse). Eclogae Geologicae Helvetiae 94: 427 - 445." type="journal article" year="2001">Bonnot & Gygi (2001)</bibRefCitation>
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, this species occurs within the Transversarium Zone from the top of the Antecedens Subzone up to the top of the Luciaeformis Subzone. In Bert’s (2004) stratigraphic scheme this stratigraphic range corresponds to an interval spanning from the top of the Antecedens Subzone of Plicatilis Zone
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<emphasis id="D082A5173772BD15FBFCFE0DC185FE58" box="[1115,1162,427,450]" italics="true" pageId="27" pageNumber="534">sensu</emphasis>
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Bert 2004 up to the top of the Luciaeformis Subzone of the Transversarium Zone
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<emphasis id="D082A5173772BD15FCDDFE46C6A6FE6D" box="[890,937,480,503]" italics="true" pageId="27" pageNumber="534">sensu</emphasis>
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Bert 2004.
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</paragraph>
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</subSubSection>
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<subSubSection id="AAEC2A8E3772BD15FD02FDB3C15DFBB0" pageId="27" pageNumber="534" type="description">
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<paragraph id="E24979053772BD15FD02FDB3C63AFDB7" blockId="27.[677,1210,533,1066]" box="[677,821,533,559]" pageId="27" pageNumber="534">DESCRIPTION</paragraph>
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<paragraph id="E24979053772BD15FD02FD92C15DFBB0" blockId="27.[677,1210,533,1066]" pageId="27" pageNumber="534">
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The specimen is an entirely septated internal mould showing an evolute coiling. The whorl section is subquadratic, the flanks are flat. Neither the umbilical edge, nor the umbilical wall, is developed. The sculpture is made of two rows of tubercles, periumbilical and ventrolateral. The periumbilcal tubercles are rather bullae, i.e. they are shortly stretched along the height, whereas the ventrolateral tubercles have the aspect of spines. An extremely weak rib links the tubercles of the two rows. The preservation of the early whorls does not allow precise measurement of the diameter where tubercles begin. Nevertheless, the first visible ventrolateral spine occurs at a diameter of almost
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<quantity id="250ED4E03772BD15FCCCFC76C6B6FC71" box="[875,953,976,1003]" metricMagnitude="-2" metricUnit="m" metricValue="1.6" pageId="27" pageNumber="534" unit="mm" value="16.0">16 mm</quantity>
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, whereas the first ventrolateral bulla is visible at an approximate diameter of
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<quantity id="250ED4E03772BD15FD66FBB6C61BFBB0" box="[705,788,1040,1066]" metricMagnitude="-2" metricUnit="m" metricValue="1.8" pageId="27" pageNumber="534" unit="mm" value="18.0">18 mm</quantity>
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. Measurements: see
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<tableCitation id="AF744CBE3772BD15FC49FBA9C15DFBB0" box="[1006,1106,1039,1066]" captionStart="TABLE" captionStartId="40.[376,385,1040,1057]" captionText="TABLE 19. — Measurements of Euaspidoceras cf. oegir (Oppel, 1863)." pageId="27" pageNumber="534">Table 19.</tableCitation>
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</paragraph>
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</subSubSection>
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||
<subSubSection id="AAEC2A8E3772BD15FD02FBE9C135FADD" pageId="27" pageNumber="534" type="discussion">
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<paragraph id="E24979053772BD15FD02FBE9C629FBFD" blockId="27.[677,1210,1103,1351]" box="[677,806,1103,1129]" pageId="27" pageNumber="534">DISCUSSION</paragraph>
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<paragraph id="E24979053772BD15FD02FBC8C135FADD" blockId="27.[677,1210,1103,1351]" pageId="27" pageNumber="534">
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The preservation of this single specimen is far from satisfactory. However, its visible characters suggest the comparison with
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<taxonomicName id="25F602863772BD15FC26FB09C6C2FB52" baseAuthorityName="Oppel" baseAuthorityYear="1863" box="[897,973,1199,1224]" class="Cephalopoda" family="Aspidoceratidae" genus="Euaspidoceras" higherTaxonomySource="GBIF" kingdom="Animalia" order="Ammonitida" pageId="27" pageNumber="534" phylum="Mollusca" rank="species" species="oegir">
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<emphasis id="D082A5173772BD15FC26FB09C6C2FB52" box="[897,973,1199,1224]" italics="true" pageId="27" pageNumber="534">E. oegir</emphasis>
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</taxonomicName>
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. Our specimen shows, at the same diameter, close ornamental characters to the well preserved specimens of this species recently illustrated by
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<bibRefCitation id="866704F43772BD15FC92FAABC123FABD" author="BONNOT A. & GYGI R. A." box="[821,1068,1293,1319]" pageId="27" pageNumber="534" pagination="427 - 445" refId="ref18257" refString="BONNOT A. & GYGI R. A. 2001. - Les Euaspidoceratinae (Ammonitina, Aspidoceratidae) de la Zone a Transversarium (Oxfordien moyen) de Suisse septentrionale (cantons d'Argovie et de Schaffhouse). Eclogae Geologicae Helvetiae 94: 427 - 445." type="journal article" year="2001">Bonnot & Gygi (2001)</bibRefCitation>
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and only differs because of its lower whorl height.
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</paragraph>
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</subSubSection>
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||
<subSubSection id="AAEC2A8E3772BD15FD0EFA2DC646F938" pageId="27" pageNumber="534" type="reference_group">
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||
<paragraph id="E24979053772BD15FD0EFA2DC6D1FA5F" blockId="27.[681,1205,1419,1477]" pageId="27" pageNumber="534">
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||
<taxonomicName id="25F602863772BD15FD0EFA2DC1BAFA3C" authority="(Arkell, 1927)" baseAuthorityName="Arkell" baseAuthorityYear="1927" box="[681,1205,1419,1446]" class="Cephalopoda" family="Aspidoceratidae" genus="Euaspidoceras" higherTaxonomySource="GBIF" kingdom="Animalia" order="Ammonitida" pageId="27" pageNumber="534" phylum="Mollusca" rank="species" species="paucituberculatum">
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<emphasis id="D082A5173772BD15FD0EFA2DC11AFA3C" bold="true" box="[681,1045,1419,1446]" italics="true" pageId="27" pageNumber="534">Euaspidoceras paucituberculatum</emphasis>
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||
(
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<bibRefCitation id="866704F43772BD15FB84FA2AC1A2FA3C" author="ARKELL W. J." box="[1059,1197,1420,1446]" pageId="27" pageNumber="534" pagination="67 - 181" refId="ref17765" refString="ARKELL W. J. 1927. - The corallian rocks of Oxford, Berks and North Wilts. Philosophical Transactions of the Royal Society B (216): 67 - 181." type="journal article" year="1927">Arkell, 1927</bibRefCitation>
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)
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</taxonomicName>
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(
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<figureCitation id="7ACD65803772BD15FC2FFA0DC6DAFA5F" box="[904,981,1451,1477]" captionStart="FIG" captionStartId="28.[113,124,1658,1675]" captionTargetBox="[161,1200,252,1581]" captionTargetId="figure-65@28.[82,1255,207,1626]" captionTargetPageId="28" captionText="FIG. 11. — Euaspidoceras paucituberculatum (Arkell,1927),specimen MI3 8 top-9/1 from the boundary between beds 8 and 9 of Castello Inici section. The two asterisks indicate two laevaptychi. The arrow indicates the beginning of the body chamber. Scale bar: 5 cm." figureDoi="http://doi.org/10.5281/zenodo.4651060" httpUri="https://zenodo.org/record/4651060/files/figure.png" pageId="27" pageNumber="534">Fig. 11</figureCitation>
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)
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</paragraph>
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<paragraph id="E24979053772BD15FD02FA47C1BAFA63" blockId="27.[677,1205,1505,1529]" box="[677,1205,1505,1529]" pageId="27" pageNumber="534">
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||
<taxonomicName id="25F602863772BD15FD02FA47C131FA63" authority="Arkell, 1927" authorityName="Arkell" authorityYear="1927" box="[677,1086,1505,1529]" class="Cephalopoda" family="Aspidoceratidae" genus="Aspidoceras" higherTaxonomySource="GBIF" kingdom="Animalia" order="Ammonitida" pageId="27" pageNumber="534" phylum="Mollusca" rank="species" species="paucituberculatum">
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<emphasis id="D082A5173772BD15FD02FA47C6B2FA63" box="[677,957,1505,1529]" italics="true" pageId="27" pageNumber="534">Aspidoceras paucituberculatum</emphasis>
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||
<bibRefCitation id="866704F43772BD15FC63FA47C131FA63" author="ARKELL W. J." box="[964,1086,1505,1529]" pageId="27" pageNumber="534" pagination="67 - 181" refId="ref17765" refString="ARKELL W. J. 1927. - The corallian rocks of Oxford, Berks and North Wilts. Philosophical Transactions of the Royal Society B (216): 67 - 181." type="journal article" year="1927">Arkell, 1927</bibRefCitation>
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</taxonomicName>
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: pl. 2, fig. 2.
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</paragraph>
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<paragraph id="E24979053772BD15FD02F9A8C10AF9C1" blockId="27.[677,1210,1550,1698]" pageId="27" pageNumber="534">
|
||
<treatmentCitationGroup id="C2E65E2B3772BD15FD02F9A8C10AF9C1" pageId="27" pageNumber="534">
|
||
<taxonomicName id="25F602863772BD15FD02F9A8C16EF9BC" authorityName="Arkell" authorityYear="1927" box="[677,1121,1550,1574]" class="Cephalopoda" family="Aspidoceratidae" genus="Aspidoceras" higherTaxonomySource="GBIF" kingdom="Animalia" order="Ammonitida" pageId="27" pageNumber="534" phylum="Mollusca" rank="species" species="paucituberculatum" subGenus="Euaspidoceras">
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||
<emphasis id="D082A5173772BD15FD02F9A8C600F9BC" box="[677,783,1550,1574]" italics="true" pageId="27" pageNumber="534">Aspidoceras</emphasis>
|
||
(
|
||
<emphasis id="D082A5173772BD15FCB8F9A8C6AFF9BC" box="[799,928,1550,1574]" italics="true" pageId="27" pageNumber="534">Euaspidoceras</emphasis>
|
||
)
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||
<emphasis id="D082A5173772BD15FC17F9A8C16EF9BC" box="[944,1121,1550,1574]" italics="true" pageId="27" pageNumber="534">paucituberculatum</emphasis>
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</taxonomicName>
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||
–
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<treatmentCitation id="63575F143772BD15FBD9F9A8C61BF9DA" author="ARKELL W. J." page="210" pageId="27" pageNumber="534" year="1940">
|
||
<bibRefCitation id="866704F43772BD15FBD9F9A8C61BF9DA" author="ARKELL W. J." pageId="27" pageNumber="534" pagination="191 - 216" refId="ref17799" refString="ARKELL W. J. 1940. - A Monograph on the Ammonites of the English Corallian Beds. Palaeontographical Society, London: 191 - 216." type="book chapter" year="1940">Arkell 1940: 210</bibRefCitation>
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</treatmentCitation>
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, pl. 45, figs 2-5, pl. 46, figs 1-4, pl. 47, figs 1, 2, text-fig. 74, synonymy list.
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||
</treatmentCitationGroup>
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||
</paragraph>
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||
<paragraph id="E24979053772BD15FD02F9C9C646F938" blockId="27.[677,1210,1550,1698]" pageId="27" pageNumber="534">
|
||
<treatmentCitationGroup id="C2E65E2B3772BD15FD02F9C9C646F938" pageId="27" pageNumber="534">
|
||
<taxonomicName id="25F602863772BD15FD02F9C9C6DDF91D" baseAuthorityName="Arkell" baseAuthorityYear="1927" box="[677,978,1647,1671]" class="Cephalopoda" family="Aspidoceratidae" genus="Euaspidoceras" higherTaxonomySource="GBIF" kingdom="Animalia" order="Ammonitida" pageId="27" pageNumber="534" phylum="Mollusca" rank="species" species="paucituberculatum">
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||
<emphasis id="D082A5173772BD15FD02F9C9C6DDF91D" box="[677,978,1647,1671]" italics="true" pageId="27" pageNumber="534">Euaspidoceras paucituberculatum</emphasis>
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||
</taxonomicName>
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||
–
|
||
<treatmentCitation id="63575F143772BD15FC4FF9D6C7C2F938" author="BONNOT A. & GYGI R. A." page="431" pageId="27" pageNumber="534" year="2001">
|
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<bibRefCitation id="866704F43772BD15FC4FF9D6C7C2F938" author="BONNOT A. & GYGI R. A." pageId="27" pageNumber="534" pagination="427 - 445" refId="ref18257" refString="BONNOT A. & GYGI R. A. 2001. - Les Euaspidoceratinae (Ammonitina, Aspidoceratidae) de la Zone a Transversarium (Oxfordien moyen) de Suisse septentrionale (cantons d'Argovie et de Schaffhouse). Eclogae Geologicae Helvetiae 94: 427 - 445." type="journal article" year="2001">Bonnot & Gygi 2001: 431</bibRefCitation>
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||
</treatmentCitation>
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||
, pl. 1, fig. 4.
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||
</treatmentCitationGroup>
|
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</paragraph>
|
||
</subSubSection>
|
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<paragraph id="E24979053775BD12FFD6F9DCC1A6F938" blockId="28.[113,1209,1658,1698]" pageId="28" pageNumber="535">
|
||
FIG. 11. —
|
||
<taxonomicName id="25F602863775BD12FF60F9DCC744F911" authority="(Arkell, 1927)" baseAuthorityName="Arkell" baseAuthorityYear="1927" box="[199,587,1658,1675]" class="Cephalopoda" family="Aspidoceratidae" genus="Euaspidoceras" higherTaxonomySource="GBIF" kingdom="Animalia" order="Ammonitida" pageId="28" pageNumber="535" phylum="Mollusca" rank="species" species="paucituberculatum">
|
||
<emphasis id="D082A5173775BD12FF60F9DCC4D4F911" box="[199,475,1658,1675]" italics="true" pageId="28" pageNumber="535">Euaspidoceras paucituberculatum</emphasis>
|
||
(
|
||
<bibRefCitation id="866704F43775BD12FE43F9DCC749F911" author="ARKELL W. J." box="[484,582,1658,1675]" pageId="28" pageNumber="535" pagination="67 - 181" refId="ref17765" refString="ARKELL W. J. 1927. - The corallian rocks of Oxford, Berks and North Wilts. Philosophical Transactions of the Royal Society B (216): 67 - 181." type="journal article" year="1927">Arkell,1927</bibRefCitation>
|
||
)
|
||
</taxonomicName>
|
||
,specimen MI3 8 top-9/1 from the boundary between beds 8 and 9 of Castello Inici section. The two asterisks indicate two laevaptychi. The arrow indicates the beginning of the body chamber. Scale bar: 5 cm.
|
||
</paragraph>
|
||
</caption>
|
||
<subSubSection id="AAEC2A8E3774BD13FFD6FF7EC47EFE12" pageId="29" pageNumber="536" type="materials_examined">
|
||
<paragraph id="E24979053774BD13FFD6FF7EC70EFF75" blockId="29.[113,513,215,239]" box="[113,513,215,239]" pageId="29" pageNumber="536">MATERIAL EXAMINED. — MI3 8 top-9/1.</paragraph>
|
||
<paragraph id="E24979053774BD13FFD6FEAEC47EFE12" blockId="29.[113,647,263,392]" pageId="29" pageNumber="536">STRATIGRAPHIC DISTRIBUTION. — The specimen has been collected at the boundary between beds 8 and 9 of Castello Inici section and possibly it belongs to the very base of bed 9. This species is reported from the Middle Oxfordian Plicatilis Zone.</paragraph>
|
||
</subSubSection>
|
||
<subSubSection id="AAEC2A8E3774BD13FFD6FE10C49AFBD3" pageId="29" pageNumber="536" type="description">
|
||
<paragraph id="E24979053774BD13FFD6FE10C40DFE54" blockId="29.[113,647,438,1097]" box="[113,258,438,464]" pageId="29" pageNumber="536">DESCRIPTION</paragraph>
|
||
<paragraph id="E24979053774BD13FFD6FE73C49AFBD3" blockId="29.[113,647,438,1097]" pageId="29" pageNumber="536">
|
||
Incomplete specimen of a large individual characterized by an evolute shell whose diameter could have reached almost
|
||
<quantity id="250ED4E03774BD13FEA9FDB3C465FDB5" box="[270,362,533,559]" metricMagnitude="-1" metricUnit="m" metricValue="2.1" pageId="29" pageNumber="536" unit="mm" value="210.0">210 mm</quantity>
|
||
. The visible inner whorls are preserved as a cast while the last whorl is an inner mould. Up to a diameter of almost
|
||
<quantity id="250ED4E03774BD13FE43FDF2C73EFDF5" box="[484,561,596,623]" metricMagnitude="-2" metricUnit="m" metricValue="2.2" pageId="29" pageNumber="536" unit="mm" value="22.0">22 mm</quantity>
|
||
the sole sculptural elements preserved are external tubercles (these corresponded to spines almost perpendicular to the flank as demonstrated by their impression on the sediment) located on the ventrolateral edge. An umbilical row of tubercles is visible at
|
||
<quantity id="250ED4E03774BD13FDABFD55C754FC97" box="[524,603,755,781]" metricMagnitude="-2" metricUnit="m" metricValue="3.0" pageId="29" pageNumber="536" unit="mm" value="30.0">30 mm</quantity>
|
||
but probably appears around
|
||
<quantity id="250ED4E03774BD13FEDBFCB4C4FFFCB7" box="[380,496,786,813]" metricMagnitude="-2" metricUnit="m" metricValue="2.3" metricValueMax="2.4" metricValueMin="2.2" pageId="29" pageNumber="536" unit="mm" value="23.0" valueMax="24.0" valueMin="22.0">22-24 mm</quantity>
|
||
. The two rows of tubercles correspond to extremities of shallow ribs. The interspaces between two ribs bear fine, radial growth-lines. Between 80 and
|
||
<quantity id="250ED4E03774BD13FE06FCD7C4F7FC16" box="[417,504,881,908]" metricMagnitude="-1" metricUnit="m" metricValue="1.15" pageId="29" pageNumber="536" unit="mm" value="115.0">115 mm</quantity>
|
||
the sculptural characteristics are poorly visible, with the exception of growth-lines that appear to be rursi-radiate on the wide, oblique, umbilical wall. The second half of the last whorl belongs to the body chamber and is characterized by spaced ribs that bear umbilical and ventrolateral tubercles.
|
||
</paragraph>
|
||
</subSubSection>
|
||
<subSubSection id="AAEC2A8E3774BD13FFD6FBC9C777FA1D" pageId="29" pageNumber="536" type="discussion">
|
||
<paragraph id="E24979053774BD13FFD6FBC9C5FCFB1D" blockId="29.[113,647,1135,1415]" box="[113,243,1135,1161]" pageId="29" pageNumber="536">DISCUSSION</paragraph>
|
||
<paragraph id="E24979053774BD13FFD6FB28C777FA1D" blockId="29.[113,647,1135,1415]" pageId="29" pageNumber="536">
|
||
The preservation of the studied specimen does not allow a firm identification. The succession of ornamental stages is similar to the one described by
|
||
<bibRefCitation id="866704F43774BD13FF33FB4BC452FA9D" author="ARKELL W. J." box="[148,349,1261,1287]" pageId="29" pageNumber="536" pagination="191 - 216" refId="ref17799" refString="ARKELL W. J. 1940. - A Monograph on the Ammonites of the English Corallian Beds. Palaeontographical Society, London: 191 - 216." type="book chapter" year="1940">Arkell (1940: 212</bibRefCitation>
|
||
, 213) but in our specimen the onset of the two rows of tubercles is recorded at lower diameters. Two laevaptychi are visible at the end of the last whorl but it is difficult to state whether they belonged to this individual or not.
|
||
</paragraph>
|
||
</subSubSection>
|
||
</treatment>
|
||
</document> |