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<mods:title id="DE8E4F52596387EF7DC02EF6A68B6FC8">Antaganides n. gen., a new genus of Middle Jurassic nautiloid, ancestor of Pseudaganides Spath, 1927, with discussion on the phyletic origin of the family Pseudonautilidae</mods:title>
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<taxonomicName id="4C2395C2FF80FFE004E4A639FD4DF8A8" authority="(Schlotheim, 1820)" baseAuthorityName="Schlotheim" baseAuthorityYear="1820" box="[208,699,1878,1906]" class="Cephalopoda" family="Pseudonautilidae" genus="Pseudaganides" higherTaxonomySource="GBIF" kingdom="Animalia" order="Nautilida" pageId="18" pageNumber="487" phylum="Mollusca" rank="species" species="aganiticus">
<emphasis id="B9573253FF80FFE004E4A639FE17F8A9" bold="true" box="[208,481,1878,1906]" italics="true" pageId="18" pageNumber="487">Pseudaganides aganiticus</emphasis>
(Schlotheim, 1820)
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<paragraph id="8B9CEE41FF80FFE00545A616FDECF848" blockId="18.[208,699,1878,1937]" box="[369,538,1910,1937]" pageId="18" pageNumber="487">(Fig. 14C1-C3)</paragraph>
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<paragraph id="8B9CEE41FF80FFE004B0A6D8FEACF832" blockId="18.[132,774,1977,2027]" pageId="18" pageNumber="487">
<taxonomicName id="4C2395C2FF80FFE004B0A6D8FDDFF808" authority="Schlotheim, 1820: 63" authorityName="Schlotheim" authorityPageNumber="63" authorityYear="1820" box="[132,553,1977,2001]" genus="Nautilites" higherTaxonomySource="GBIF" kingdom="Animalia" pageId="18" pageNumber="487" phylum="Mollusca" rank="species" species="aganiticus">
<emphasis id="B9573253FF80FFE004B0A6D8FEB0F808" box="[132,326,1977,2001]" italics="true" pageId="18" pageNumber="487">Nautilites aganiticus</emphasis>
Schlotheim, 1820: 63
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. — von
<bibRefCitation id="EFB293B0FF80FFE006B0A6D8FCF6F808" author="LOESCH K. C. VON" box="[644,768,1977,2001]" pageId="18" pageNumber="487" pagination="57 - 146" refId="ref15513" refString="LOESCH K. C. VON 1914. - Die Nautiliden des Weisser Jura. 1 ste Teil. Palaeontographica 61: 57 - 146, pls 10 - 15." type="journal article" year="1914">Loesch 1914</bibRefCitation>
: pl. XV (VI), fig. 1a-b.
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<treatmentCitationGroup id="AB33C96FFF80FFE00719A56EFB01FB9B" pageId="18" pageNumber="487">
<taxonomicName id="4C2395C2FF80FFE00719A56EFBE1FBFE" baseAuthorityName="Schlotheim" baseAuthorityYear="1820" box="[813,1047,1039,1063]" class="Cephalopoda" family="Pseudonautilidae" genus="Pseudaganides" higherTaxonomySource="GBIF" kingdom="Animalia" order="Nautilida" pageId="18" pageNumber="487" phylum="Mollusca" rank="species" species="aganiticus">
<emphasis id="B9573253FF80FFE00719A56EFBE1FBFE" box="[813,1047,1039,1063]" italics="true" pageId="18" pageNumber="487">Pseudaganides aganiticus</emphasis>
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<treatmentCitation id="0A82C850FF80FFE00019A56EFA9CFBFE" author="MARCHAND D. &amp; TINTANT H." box="[1069,1386,1039,1063]" page="146" pageId="18" pageNumber="487" year="1971">
<bibRefCitation id="EFB293B0FF80FFE00019A56EFA9CFBFE" author="MARCHAND D. &amp; TINTANT H." box="[1069,1386,1039,1063]" pageId="18" pageNumber="487" pagination="111 - 169" refId="ref15635" refString="MARCHAND D. &amp; TINTANT H. 1971. - Etudes statistiques sur Pseudaganides aganiticus (Schlotheim) et diverses especes voisines. Bulletin des Sciences de Bourgogne 28: 111 - 169." type="journal article" year="1971">Marchand &amp; Tintant 1971: 146</bibRefCitation>
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, pl. IV, fig. 1a-b. —
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<bibRefCitation id="EFB293B0FF80FFE0079BA54BFB83FB9B" author="JAIN S. &amp; SALAMON M. A. &amp; SCHWEIGERT G. &amp; PASZCZA K." box="[943,1141,1066,1090]" pageId="18" pageNumber="487" pagination="1 - 33" refId="ref15155" refString="JAIN S., SALAMON M. A., SCHWEIGERT G. &amp; PASZCZA K. 2023. - Ammonite-calibrated nautiloid occurrences from the Callovian-Oxfordian (Middle-Upper Jurassic) deposits of southern Poland. Historical Biology 23 (65): 1 - 33, 17 figs, 9 apps. https: // doi. org / 10.1080 / 08912963.2023.2220006" type="journal article" year="2023">
Jain
<emphasis id="B9573253FF80FFE007EAA54BFBE6FB9B" box="[990,1040,1066,1090]" italics="true" pageId="18" pageNumber="487">et al.</emphasis>
2023: 17
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, fig. 14A-H.
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</paragraph>
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.
<emphasis id="B9573253FF80FFE0079EA502FC35FBA3" box="[938,963,1123,1146]" italics="true" pageId="18" pageNumber="487"></emphasis>
Small shells, maximum diameter about
<quantity id="4CDB43A4FF80FFE0016BA503FA5AFBA3" box="[1375,1452,1122,1146]" metricMagnitude="-2" metricUnit="m" metricValue="9.0" pageId="18" pageNumber="487" unit="mm" value="90.0">90 mm</quantity>
. The umbilicus is quite small, the section is higher than wide with flat sides converging toward a narrow and rounded venter on the phragmocone. This venter flattens on the body-chamber, becoming rarely concave. Most of the time it is boarded by angular ventrolateral shoulders. Suture line with a wide and deep dissymmetric lateral lobe, lateral saddle narrow and quite short, shallow, and rounded ventral lobe.
</paragraph>
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. —
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(complete);
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,
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; [
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,
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]; top of the
<taxonomicName id="4C2395C2FF80FFE00765A4E8FC38FA78" authority="Zone" authorityName="Zone" box="[849,974,1417,1441]" class="Gastropoda" family="Trochidae" genus="Anceps" kingdom="Animalia" order="Trochida" pageId="18" pageNumber="487" phylum="Mollusca" rank="genus">
<emphasis id="B9573253FF80FFE00765A4E8FC67FA79" box="[849,913,1417,1440]" italics="true" pageId="18" pageNumber="487">Anceps</emphasis>
Zone
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; Middle Callovian; Patrick Branger leg.;
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;
<emphasis id="B9573253FF80FFE0071FA4C5FC30FA65" box="[811,966,1444,1468]" italics="true" pageId="18" pageNumber="487">2023.PB.N111</emphasis>
(
<collectorName id="26D68B97FF80FFE007E3A4C2FC08FA62" box="[983,1022,1443,1467]" pageId="18" pageNumber="487">Fig.</collectorName>
14C1-C3)
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.
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.
<emphasis id="B9573253FF80FFE007EAA4BCFC01FA2D" box="[990,1015,1501,1524]" italics="true" pageId="18" pageNumber="487"></emphasis>
See
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</paragraph>
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<subSubSection id="C339BDCAFF80FFE00719A774FA59F9A5" pageId="18" pageNumber="487" type="distribution">
<paragraph id="8B9CEE41FF80FFE00719A774FA59F9A5" blockId="18.[811,1456,1557,1660]" pageId="18" pageNumber="487">
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. — The oldest sample that can be attributed to this taxon has been taken from the top of the
<taxonomicName id="4C2395C2FF80FFE000EEA751FC58F9B8" authority="Zone, Middle Callovian. It" authorityName="Zone, Middle Callovian. It" class="Gastropoda" family="Trochidae" genus="Anceps" kingdom="Animalia" order="Trochida" pageId="18" pageNumber="487" phylum="Mollusca" rank="genus">
<emphasis id="B9573253FF80FFE000EEA751FAEDF99E" box="[1242,1307,1584,1607]" italics="true" pageId="18" pageNumber="487">Anceps</emphasis>
Zone, Middle Callovian. It
</taxonomicName>
is a common species within Upper Callovian and Lower Oxfordian (
<bibRefCitation id="EFB293B0FF80FFE007DEA705FB0DF9A5" author="MARCHAND D. &amp; TINTANT H." box="[1002,1275,1636,1660]" pageId="18" pageNumber="487" pagination="111 - 169" refId="ref15635" refString="MARCHAND D. &amp; TINTANT H. 1971. - Etudes statistiques sur Pseudaganides aganiticus (Schlotheim) et diverses especes voisines. Bulletin des Sciences de Bourgogne 28: 111 - 169." type="journal article" year="1971">Marchand &amp; Tintant 1971</bibRefCitation>
;
<bibRefCitation id="EFB293B0FF80FFE0013CA705FA57F9A5" author="JAIN S. &amp; SALAMON M. A. &amp; SCHWEIGERT G. &amp; PASZCZA K." box="[1288,1441,1636,1660]" pageId="18" pageNumber="487" pagination="1 - 33" refId="ref15155" refString="JAIN S., SALAMON M. A., SCHWEIGERT G. &amp; PASZCZA K. 2023. - Ammonite-calibrated nautiloid occurrences from the Callovian-Oxfordian (Middle-Upper Jurassic) deposits of southern Poland. Historical Biology 23 (65): 1 - 33, 17 figs, 9 apps. https: // doi. org / 10.1080 / 08912963.2023.2220006" type="journal article" year="2023">
Jain
<emphasis id="B9573253FF80FFE00102A704FA90F9A5" box="[1334,1382,1636,1660]" italics="true" pageId="18" pageNumber="487">et al.</emphasis>
2023
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).
</paragraph>
</subSubSection>
<subSubSection id="C339BDCAFF80FFE00719A7D2FB5CF832" pageId="18" pageNumber="487" type="description">
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</paragraph>
<paragraph id="8B9CEE41FF80FFE00719A7B3FB5CF832" blockId="18.[812,1455,1715,2028]" pageId="18" pageNumber="487">
As the investigations were mainly focused on Jurassic strata from southern Deux-Sèvres, the collection is lacking in Upper Callovian examples. Nevertheless, the few
<taxonomicName id="4C2395C2FF80FFE00719A650FC34F892" authorityName="Spath" authorityYear="1927" box="[813,962,1841,1867]" class="Cephalopoda" family="Pseudonautilidae" genus="Pseudaganides" higherTaxonomySource="GBIF" kingdom="Animalia" order="Nautilida" pageId="18" pageNumber="487" phylum="Mollusca" rank="genus">
<emphasis id="B9573253FF80FFE00719A650FC34F892" box="[813,962,1841,1867]" italics="true" pageId="18" pageNumber="487">Pseudaganides</emphasis>
</taxonomicName>
from these beds clearly belong to
<taxonomicName id="4C2395C2FF80FFE00119A653FC37F8B2" authority="(Schlotheim)" baseAuthorityName="Schlotheim" baseAuthorityYear="1820" class="Cephalopoda" family="Pseudonautilidae" genus="Pseudaganides" higherTaxonomySource="GBIF" kingdom="Animalia" order="Nautilida" pageId="18" pageNumber="487" phylum="Mollusca" rank="species" species="aganiticus">
<emphasis id="B9573253FF80FFE00119A653FA5BF892" box="[1325,1453,1842,1867]" italics="true" pageId="18" pageNumber="487">P. aganiticus</emphasis>
(Schlotheim)
</taxonomicName>
. This species has been revised by
<bibRefCitation id="EFB293B0FF80FFE00114A630FC21F852" author="MARCHAND D. &amp; TINTANT H." pageId="18" pageNumber="487" pagination="111 - 169" refId="ref15635" refString="MARCHAND D. &amp; TINTANT H. 1971. - Etudes statistiques sur Pseudaganides aganiticus (Schlotheim) et diverses especes voisines. Bulletin des Sciences de Bourgogne 28: 111 - 169." type="journal article" year="1971">Marchand &amp; Tintant (1971)</bibRefCitation>
and no further comment is needed. It differs from
<taxonomicName id="4C2395C2FF80FFE007A9A6F3FBAFF872" authorityName="d'Orbigny" authorityYear="1850" box="[925,1113,1937,1963]" class="Cephalopoda" family="Nautilidae" genus="Nautilus" kingdom="Animalia" order="Nautilida" pageId="18" pageNumber="487" phylum="Mollusca" rank="species" species="subbiangulatus">
<emphasis id="B9573253FF80FFE007A9A6F3FBAFF872" box="[925,1113,1937,1963]" italics="true" pageId="18" pageNumber="487">P. subbiangulatus</emphasis>
</taxonomicName>
in three major points, a more rounded section on the flanks, a smaller size (
<figureCitation id="1318F2C4FF80FFE00113A6D0FA80F812" box="[1319,1398,1969,1995]" captionStart="FIG" captionStartId="10.[132,143,1605,1622]" captionTargetBox="[208,1379,955,1567]" captionTargetId="graphics-542@10.[246,1222,963,1480]" captionTargetPageId="10" captionText="FIG. 10. — Evolution of the size of the adult shell and phragmocone among the different species of Antaganides n. gen. and Pseudaganides Spath, 1927 for full grown shells." figureDoi="http://doi.org/10.5281/zenodo.13884455" httpUri="https://zenodo.org/record/13884455/files/figure.png" pageId="18" pageNumber="487">Fig. 10</figureCitation>
) and a rather closed umbilicus (
<figureCitation id="1318F2C4FF80FFE0006CA6B0FB6FF835" box="[1112,1177,2001,2028]" captionStart="FIG" captionStartId="9.[132,143,883,900]" captionTargetBox="[139,1451,215,843]" captionTargetId="graphics-190@9.[139,1451,215,843]" captionTargetPageId="9" captionText="FIG. 7. — Ratio “u” of the umbilical width compared with the diameter of the shell (U/D) among the different species of Antaganides n. gen. and Pseudaganides Spath, 1927." figureDoi="http://doi.org/10.5281/zenodo.13884447" httpUri="https://zenodo.org/record/13884447/files/figure.png" pageId="18" pageNumber="487">Fig. 7</figureCitation>
).
</paragraph>
</subSubSection>
</treatment>
</document>