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<mods:title id="896956F0948551129FB015AF7246A9B5">A Unitary Association-based conodont biozonation of the Smithian-Spathian boundary (Early Triassic) and associated biotic crisis from South China</mods:title>
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<mods:date id="07EE11FCC6DB8F050D03B58EB5D5CC60">2022</mods:date>
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<treatment id="038B1D1D6441FF99FF1BEDFBD2D5FBA7" ID-DOI="http://doi.org/10.5281/zenodo.13127749" ID-Zenodo-Dep="13127749" LSID="urn:lsid:plazi:treatment:038B1D1D6441FF99FF1BEDFBD2D5FBA7" httpUri="http://treatment.plazi.org/id/038B1D1D6441FF99FF1BEDFBD2D5FBA7" lastPageNumber="41" pageId="40" pageNumber="41">
<subSubSection id="C338FF806441FF99FF1BEDFBD28EFEE7" box="[151,703,235,259]" pageId="40" pageNumber="41" type="nomenclature">
<paragraph id="8B9DAC0B6441FF99FF1BEDFBD28EFEE7" blockId="40.[151,703,235,291]" box="[151,703,235,259]" pageId="40" pageNumber="41">
<heading id="D0D51B676441FF99FF1BEDFBD28EFEE7" box="[151,703,235,259]" fontSize="9" level="2" pageId="40" pageNumber="41" reason="8">
<taxonomicName id="4C22D7886441FF99FF1BEDFBD28EFEE7" authority="(Orchard, 1995)" baseAuthorityName="Orchard" baseAuthorityYear="1995" box="[151,703,235,259]" family="Gondolellidae" genus="Triassospathodus" higherTaxonomySource="GBIF" isUncertain="true" kingdom="Animalia" order="Ozarkodinida" pageId="40" pageNumber="41" phylum="Chordata" rank="species" species="symmetricus">
<emphasis id="B95670196441FF99FF1BEDFBD164FEE7" box="[151,341,235,259]" italics="true" pageId="40" pageNumber="41">Triassospathodus</emphasis>
aff.
<emphasis id="B95670196441FF99FE0EEDFCD23BFEE7" box="[386,522,236,259]" italics="true" pageId="40" pageNumber="41">symmetricus</emphasis>
(
<bibRefCitation id="EFB3D1FA6441FF99FD94EDFBD287FEE7" author="Orchard" box="[536,694,235,259]" firstAuthor="Orchard" pageId="40" pageNumber="41" pagination="110 - 122" refId="ref45513" refString="Orchard, M. J. (1995). Taxonomy and correlation of Lower Triassic (Spathian) segminate conodonts from Oman and revision of some species of Neospathodus. Journal of Paleontology, 69 (1), 110 - 122. https: // doi. org / 10.1017 / S 0022336000026962" type="journal article" year="1995">Orchard, 1995</bibRefCitation>
)
</taxonomicName>
</heading>
</paragraph>
</subSubSection>
<subSubSection id="C338FF806441FF99FF1BEC1BD2D5FBA7" pageId="40" pageNumber="41" type="description">
<paragraph id="8B9DAC0B6441FF99FF1BEC1BD159FEC7" blockId="40.[151,703,235,291]" box="[151,360,267,291]" pageId="40" pageNumber="41">
<figureCitation id="1319B08E6441FF99FF1BEC1BD0CFFEC7" box="[151,254,267,291]" captionStart="Fig" captionStartId="28.[169,200,1717,1737]" captionTargetBox="[152,1438,238,1801]" captionTargetId="figure-11@29.[228,1362,254,1763]" captionTargetPageId="29" captionText="Fig. 18 Novispathodinae from Laren and Lilong. Magnification is ×80.The scale bar is 400 μm. All elements are considered to be P1 elements if not specifically identified otherwise.A, B, D, F, LN, Q, S, T Novispathodus praebrevissimus n. sp.; A LIL506,PIMUZ 39274; B LAR207, PIMUZ 39275; D LIL508, PIMUZ 39276; F LIL507, PIMUZ 39277;L LIL507, PIMUZ 39278; M LIL509, PIMUZ 39279; N LIL507,PIMUZ 39280; Q LIL507, PIMUZ 39281; S LIL507, PIMUZ 39282; T LIL507, PIMUZ 39283. C, O, R Novispathodus?praebrevissimus n. sp.; C LAR204,PIMUZ 39284; O LIL507, PIMUZ 39285; R LIL507, PIMUZ 39286. E, I Novispathodus ex gr. pingdingshanensis (Zhao &amp; Orchard); E LIL507,PIMUZ 39232, I LIL507, PIMUZ 39233. G Triassospathodus aff. symmetricus (Orchard);LIL507, PIMUZ 39309. H Novispathodus ex gr. abruptus (Orchard); LIL507, PIMUZ 39212. J, K Novispathodus praebrevissimus (juvenile) n. sp.; J LIL507, PIMUZ 39287; K LIL507,PIMUZ 39288. P Novispathodus robustispinus (Zhao &amp; Orchard); LIL507,PIMUZ 39290" figureDoi="http://doi.org/10.5281/zenodo.13127512" httpUri="https://zenodo.org/record/13127512/files/figure.png" pageId="40" pageNumber="41">Figs. 18G</figureCitation>
;
<figureCitation id="1319B08E6441FF99FE85EC1BD159FEC7" box="[265,360,267,291]" captionStart="Fig" captionStartId="39.[169,199,1702,1722]" captionTargetBox="[152,1438,238,1895]" captionTargetId="figure-11@39.[256,1335,254,1690]" captionTargetPageId="39" captionText="Fig.24 Novispathodinae and uncertain from Qiakong,Laren,Shanggang,and Lilong. Magnification is×80.The scale bar is 400 μm.All elements are considered to be P1 elements if not specifically identified otherwise.A, D, G, H Triassospathodushomeri (Bender);A LIL515C,PIMUZ 39313;D QIA155,PIMUZ 39314;G LIL513B,PIMUZ 39315;H LIL515B,PIMUZ 39316.B, E, F Triassospathodus aff.symmetricus (Orchard);B QIA138,PIMUZ 39306;E LIL505,PIMUZ 39307; F QIA136,PIMUZ 39308.C, IQ Triassospathodussymmetricus (Orchard);C QIA140,PIMUZ 39326;I SHA313,PIMUZ 39327;J QIA143,PIMUZ 39328;K QIA144, PIMUZ 39329;L QIA141,PIMUZ 39330;M LIL515D,PIMUZ 39331;N LIL509,PIMUZ 39332;O LIL513B,PIMUZ 39333;P LIL513B,PIMUZ 39334;Q LIL513A, PIMUZ 39335.RT Aduncodina unicosta (Ding);R BAN5,PIMUZ 39100;S SHA320,PIMUZ 39101;T SHA318,PIMUZ 39102" figureDoi="http://doi.org/10.5281/zenodo.12000416" httpUri="https://zenodo.org/record/12000416/files/figure.png" pageId="40" pageNumber="41">24B, E, F</figureCitation>
</paragraph>
<paragraph id="8B9DAC0B6441FF99FF1BEC5BD188FE67" blockId="40.[151,775,331,451]" pageId="40" pageNumber="41">
2004
<taxonomicName id="4C22D7886441FF99FF50EC5BD192FE87" box="[220,419,331,355]" family="Gondolellidae" genus="Neospathodus" kingdom="Animalia" pageId="40" pageNumber="41" phylum="Chordata" rank="species" species="undetermined">
<emphasis id="B95670196441FF99FF50EC5BD144FE87" box="[220,373,331,355]" italics="true" pageId="40" pageNumber="41">Neospathodus</emphasis>
sp.
</taxonomicName>
aff.
<taxonomicName id="4C22D7886441FF99FE68EC5CD332FE87" authority="Orchard" authorityName="Orchard" box="[484,771,331,355]" genus="Triassospathodus" higherTaxonomySource="GBIF" kingdom="Animalia" pageId="40" pageNumber="41" phylum="Chordata" rank="species" species="symmetricus">
<emphasis id="B95670196441FF99FE68EC5CD2A5FE87" box="[484,660,332,355]" italics="true" pageId="40" pageNumber="41">N. symmetricus</emphasis>
Orchard
</taxonomicName>
; Koike, p. 133, figs. 2.42.5.
</paragraph>
<paragraph id="8B9DAC0B6441FF99FF1BEC9BD114FE27" blockId="40.[151,775,331,451]" pageId="40" pageNumber="41">
2015
<taxonomicName id="4C22D7886441FF99FF51EC9BD286FE47" authority="(Orchard)" baseAuthorityName="Orchard" baseAuthorityYear="1995" box="[221,695,395,419]" genus="Triassospathodus" higherTaxonomySource="GBIF" kingdom="Animalia" pageId="40" pageNumber="41" phylum="Chordata" rank="species" species="symmetricus">
<emphasis id="B95670196441FF99FF51EC9BD204FE47" box="[221,565,395,419]" italics="true" pageId="40" pageNumber="41">Triassospathodus symmetricus</emphasis>
(Orchard)
</taxonomicName>
; Chen et al., fig. 8.1.
</paragraph>
<paragraph id="8B9DAC0B6441FF99FF1BECFBD18AFDE7" blockId="40.[151,777,491,1091]" box="[151,443,491,515]" pageId="40" pageNumber="41">
<emphasis id="B95670196441FF99FF1BECFBD14CFDE7" box="[151,381,491,515]" italics="true" pageId="40" pageNumber="41">Number of specimens</emphasis>
.&gt; 20.
</paragraph>
<paragraph id="8B9DAC0B6441FF99FF1BEF1BD2D2FC27" blockId="40.[151,777,491,1091]" pageId="40" pageNumber="41">
<emphasis id="B95670196441FF99FF1BEF1BD0C4FDC7" box="[151,245,523,547]" italics="true" pageId="40" pageNumber="41">Remarks</emphasis>
. Te biostratigraphical range of these specimens is usually slightly older than that of
<taxonomicName id="4C22D7886441FF99FDAFEF3CD2E1FDA7" baseAuthorityName="Orchard" baseAuthorityYear="1995" box="[547,720,556,579]" genus="Triassospathodus" higherTaxonomySource="GBIF" kingdom="Animalia" pageId="40" pageNumber="41" phylum="Chordata" rank="species" species="symmetricus">
<emphasis id="B95670196441FF99FDAFEF3CD2E1FDA7" box="[547,720,556,579]" italics="true" pageId="40" pageNumber="41">Tr. symmetricus</emphasis>
</taxonomicName>
. Te P
<subScript id="17A6AE4E6441FF99FF2AEF47D09EFD8C" attach="left" box="[166,175,599,616]" fontSize="7" pageId="40" pageNumber="41">1</subScript>
element of
<taxonomicName id="4C22D7886441FF99FEB5EF5CD224FD87" baseAuthorityName="Orchard" baseAuthorityYear="1995" box="[313,533,587,611]" genus="Triassospathodus" higherTaxonomySource="GBIF" isUncertain="true" kingdom="Animalia" pageId="40" pageNumber="41" phylum="Chordata" rank="species" species="symmetricus">
<emphasis id="B95670196441FF99FEB5EF5CD163FD87" box="[313,338,588,611]" italics="true" pageId="40" pageNumber="41">Tr</emphasis>
. aff.
<emphasis id="B95670196441FF99FE01EF5CD224FD87" box="[397,533,588,611]" italics="true" pageId="40" pageNumber="41">symmetricus</emphasis>
</taxonomicName>
resembles that of
<taxonomicName id="4C22D7886441FF99FD65EF5CD12EFD67" baseAuthorityName="Orchard" baseAuthorityYear="1995" genus="Triassospathodus" higherTaxonomySource="GBIF" kingdom="Animalia" pageId="40" pageNumber="41" phylum="Chordata" rank="species" species="symmetricus">
<emphasis id="B95670196441FF99FD65EF5CD12EFD67" italics="true" pageId="40" pageNumber="41">Tr. symmetricus</emphasis>
</taxonomicName>
, but is shorter with fewer denticles and a more circular and larger outline of the basal cavity. Te denticles are less inclined posteriorly compared to
<taxonomicName id="4C22D7886441FF99FD65EFBCD12EFD07" baseAuthorityName="Orchard" baseAuthorityYear="1995" genus="Triassospathodus" higherTaxonomySource="GBIF" kingdom="Animalia" pageId="40" pageNumber="41" phylum="Chordata" rank="species" species="symmetricus">
<emphasis id="B95670196441FF99FD65EFBCD12EFD07" italics="true" pageId="40" pageNumber="41">Tr. symmetricus</emphasis>
</taxonomicName>
and often have one additional small posteriormost denticle. Its denticles are not posteriorly arched as in
<taxonomicName id="4C22D7886441FF99FF5EEE1CD1F0FCC7" baseAuthorityName="Zhao &amp; Orchard" baseAuthorityYear="2007" box="[210,449,779,803]" family="Gondolellidae" genus="Novispathodus" higherTaxonomySource="GBIF" kingdom="Animalia" pageId="40" pageNumber="41" phylum="Chordata" rank="species" species="pingdingshanensis">
<emphasis id="B95670196441FF99FF5EEE1CD1F0FCC7" box="[210,449,779,803]" italics="true" pageId="40" pageNumber="41">Nv. pingdingshanensis</emphasis>
</taxonomicName>
. It differs from the very similar
<taxonomicName id="4C22D7886441FF99FF31EE3CD17DFCA7" box="[189,332,811,835]" family="Gondolellidae" genus="Novispathodus" higherTaxonomySource="GBIF" kingdom="Animalia" pageId="40" pageNumber="41" phylum="Chordata" rank="species" species="abruptus">
<emphasis id="B95670196441FF99FF31EE3CD0EDFCA7" box="[189,220,812,835]" italics="true" pageId="40" pageNumber="41">Nv</emphasis>
.
<emphasis id="B95670196441FF99FF66EE3BD17DFCA7" box="[234,332,811,835]" italics="true" pageId="40" pageNumber="41">abruptus</emphasis>
</taxonomicName>
by having a downturned posterior part and posteriorly reclined denticles. Tis species might represent a transitional form between
<taxonomicName id="4C22D7886441FF99FDE9EE7BD0C8FC47" family="Gondolellidae" genus="Novispathodus" higherTaxonomySource="GBIF" kingdom="Animalia" pageId="40" pageNumber="41" phylum="Chordata" rank="species" species="abruptus">
<emphasis id="B95670196441FF99FDE9EE7BD0C8FC47" italics="true" pageId="40" pageNumber="41">Novispathodus abruptus</emphasis>
</taxonomicName>
and
<taxonomicName id="4C22D7886441FF99FEBCEE9BD24CFC47" baseAuthorityName="Orchard" baseAuthorityYear="1995" box="[304,637,907,931]" genus="Triassospathodus" higherTaxonomySource="GBIF" kingdom="Animalia" pageId="40" pageNumber="41" phylum="Chordata" rank="species" species="symmetricus">
<emphasis id="B95670196441FF99FEBCEE9BD24CFC47" box="[304,637,907,931]" italics="true" pageId="40" pageNumber="41">Triassospathodus symmetricus</emphasis>
</taxonomicName>
but a multi-element apparatus reconstruction is currently lacking.
</paragraph>
<paragraph id="8B9DAC0B6441FF99FF21EEDCD2D5FBA7" blockId="40.[151,777,491,1091]" pageId="40" pageNumber="41">
<emphasis id="B95670196441FF99FF21EEDCD119FC07" box="[173,296,972,995]" italics="true" pageId="40" pageNumber="41">Occurrence</emphasis>
. Taho Formation, Southwest
<collectingCountry id="F335EC9B6441FF99FD49EEDCD332FC07" box="[709,771,972,995]" name="Japan" pageId="40" pageNumber="41">Japan</collectingCountry>
, Spathian age (Koike, 2004); South
<collectingCountry id="F335EC9B6441FF99FDA7EEFBD25EFBE7" box="[555,623,1003,1027]" name="China" pageId="40" pageNumber="41">China</collectingCountry>
, Luolou Formation, at the top of the black shales and the base of the nodular limestone in the earliest Spathian (this study).
</paragraph>
</subSubSection>
</treatment>
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