<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>1405-3322</journal-id>
<journal-title><![CDATA[Boletín de la Sociedad Geológica Mexicana]]></journal-title>
<abbrev-journal-title><![CDATA[Bol. Soc. Geol. Mex]]></abbrev-journal-title>
<issn>1405-3322</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Geológica Mexicana A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1405-33222021000100002</article-id>
<article-id pub-id-type="doi">10.18268/bsgm2021v73n1a040820</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Placas columnares de crinoideos de la Formación Las Delicias, Pérmico inferior y medio de Coahuila, México]]></article-title>
<article-title xml:lang="en"><![CDATA[Columnar crinoid plates from Las Delicias Formation, lower and middle Permian of Coahuila, Mexico]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Villanueva-Olea]]></surname>
<given-names><![CDATA[Rafael]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Quiroz-Barroso]]></surname>
<given-names><![CDATA[Sara Alicia]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Quiroz-Barragán]]></surname>
<given-names><![CDATA[Jesús]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Torres-Martínez]]></surname>
<given-names><![CDATA[Miguel Ángel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sour-Tovar]]></surname>
<given-names><![CDATA[Francisco]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional Autónoma de México Facultad de Ciencias Departamento de Biología Evolutiva]]></institution>
<addr-line><![CDATA[CDMX ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Museo Paleontológico de la Laguna  ]]></institution>
<addr-line><![CDATA[Torreón Coahuila]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Geología Departamento de Paleontología]]></institution>
<addr-line><![CDATA[CDMX ]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2021</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2021</year>
</pub-date>
<volume>73</volume>
<numero>1</numero>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-33222021000100002&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-33222021000100002&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-33222021000100002&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN Se describen trece parataxones de placas columnares de crinoideos que se han encontrado en dos localidades del Pérmico inferior y medio de la Formación Las Delicias. Ambas se ubican en la Sierra de las Delicias, al suroeste del estado de Coahuila. En estratos del Pérmico medio (Wordiano-Capitaniano) de la localidad Las Difuntas se encontró a Pentagonopternix coahuilensis n. sp., Cyelocaudex typicus, C. insaturatus, C. cf. insaturatus, Cyelocaudex sp., Floricyelus diminuta n. sp., Floricyelus sp., Preptopremnum rugosum, P. laeve, Preptopremnum sp., Heterostelechus keithi, Cyelocaudiculus regularis y Epierinus torreonense gen. ct sp. nov. En estratos de la localidad Las Sardinas, cuya edad es Pérmico temprano (Kunguriano-Roadiano), también se presenta Cyelocaudex typicus, C. sp., Preptopremnum laeve y a Epierinus torreonense. Para todos los parataxones presentes en la Formación Las Delicias, que han sido referidos previamente para otras localidades, se establece un alcance estratigráfico que se amplía hasta el Wordiano-Capitaniano. Los parataxones descritos se asocian, en su mayoría, a la Paleoprovincia Grandiana y la presencia de especies de Floricyelus y Pentagonopternix en el Pérmico de Coahuila comprueba el carácter cosmopolita de ambos géneros.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT Thirteen parataxa of crinoid plates from two localities of the lower-middle Permian of the Las Delicias Formation are deseribed. Both zones are situated in Sierra de las Delicias, to southwestern Coahuila state. The parataxa Pentagonopternix coahuilensis n. sp., Cyelocaudex typicus. C. insaturatus. C. cf. insaturatus. Cyelocaudex sp., Floricyelus diminuta n. sp., Floricyelus sp. Preptopremnum rugosum, P laeve, Preptopremnum sp., Heterostelechus keithi, Cyelocaudiculus regularis and Epierinus torreonense new genus and species were found in Las Difuntas locality of the middle Permian (Wordian Capitanian) whereas Cyelocaudex typicus, C. sp., Preptopremnum laeve and Epierinus torreonense were also found in Las Sardinas locality whose strata have been dated as early Permian (Kungurian-Roadian). The oceurrence of all parataxa in strata from the middle Permian of the Las Delicias Formation allowed extending their stratigraphic range until the Wordian Capitanian. Most species deseribed have been associated to the Grandian Paleoprovince, nonetheless, the presence of Floricyelus and Pentagonopternix parataxa in the Permian of Coahuila proves the cosmopolitan nature of both genera.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Crinoidea]]></kwd>
<kwd lng="es"><![CDATA[placas columnares]]></kwd>
<kwd lng="es"><![CDATA[Pérmico]]></kwd>
<kwd lng="es"><![CDATA[Formación Las Delicias]]></kwd>
<kwd lng="es"><![CDATA[Coahuila]]></kwd>
<kwd lng="es"><![CDATA[México]]></kwd>
<kwd lng="en"><![CDATA[Crinoidea]]></kwd>
<kwd lng="en"><![CDATA[columnal plates]]></kwd>
<kwd lng="en"><![CDATA[Permian]]></kwd>
<kwd lng="en"><![CDATA[Las Delicias Formation]]></kwd>
<kwd lng="en"><![CDATA[Coahuila]]></kwd>
<kwd lng="en"><![CDATA[México]]></kwd>
</kwd-group>
</article-meta>
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