<?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>S1405-33222019000300819</article-id>
<article-id pub-id-type="doi">10.18268/bsgm2019v71n3a11</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Clypeasteroids (Echinodermata: Echinoidea) From the Cretaceous In Mexico?]]></article-title>
<article-title xml:lang="es"><![CDATA[Clipeasteroides (Echinodermata: Echinoidea) del Cretácico en México]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Martínez-Melo]]></surname>
<given-names><![CDATA[Alejandra]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Geología ]]></institution>
<addr-line><![CDATA[Ciudad de México ]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2019</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2019</year>
</pub-date>
<volume>71</volume>
<numero>3</numero>
<fpage>819</fpage>
<lpage>830</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-33222019000300819&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-33222019000300819&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-33222019000300819&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract It is currently considered that the origin of the order Clypeasteroida occurred during the Cretaceous, with the stem group that includes the families Faujasiidae, Plasiolampadidae, Conoclypeidae, and Oligopygidae. Nevertheless, there are taxonomic reports of Cretaceous echinoids from Mexico, which also include species of the Echinarachniidae and Mellitidae families. The present paper reviews and updates the records of the Cretaceous clypeasteroids in Mexico. Specimens belonging to the order Clypeasteroida were located in national and international collections, which also provided taxonomic and paleobiogeographic data. Three species, Hardouinia aequorea, Hardouinia potosiensis, and Phyllobrissus burckhardti, are illustrated and cataloged in two of the 11 genera in family Faujasiidae. The previous records of families Echinarachniidae and Mellitidae are incorrect, coinciding with the current hypothesis on the origin of the Clypeasteroida order. Invalid catalog numbers published for the type series of Encope michoacanensis were corrected according to the Colección Nacional de Paleontología database.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Actualmente se considera que el origen del orden Clypeasteroida se dio durante el Cretácico, con el grupo basal que incluye las familias Faujasiidae, Plasiolampadidae, Conoclypeidae y Oligopygidae. Sin embargo, hay reportes taxónómicos sobre los equinoideos del Cretácico en México que también incluyen especies de las familias Echinarachniidae y Mellitidae. En el presente trabajo se revisan y actualizan los registros de clypeasteroideos del Cretácico en México. Con una revisión bibliográfica exhaustiva se localizaron ejemplares del orden Clypeasteroida albergados en colecciones nacionales e internacionales, de los que se provee información taxonómica y paleo-biogeográfica. Tres especies, Hardouinia aequorea, Hardouinia potosiensis y Phyllobrissus burckhardti, son ilustradas y catalogadas en dos de los 11 géneros de la familia Faujasiidae. Los registros previos de las familias Echinarachniidae y Mellitidae son incorrectos, coincidiendo con la hipótesis actual del origen del orden Clypeasteroida. Se corrigen los números de catálogo publicados para la serie tipo de Encope michoacanensis de acuerdo con la base de datos de la Colección Nacional de Paleontología.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Faujasiidae]]></kwd>
<kwd lng="en"><![CDATA[Hardouinia aequorea]]></kwd>
<kwd lng="en"><![CDATA[Hardouinia potosiensis]]></kwd>
<kwd lng="en"><![CDATA[Phyllobrissus burckhardti]]></kwd>
<kwd lng="en"><![CDATA[Encope michoacanensis]]></kwd>
<kwd lng="es"><![CDATA[Faujasiidae]]></kwd>
<kwd lng="es"><![CDATA[Hardouinia aequorea]]></kwd>
<kwd lng="es"><![CDATA[Hardouinia potosiensis]]></kwd>
<kwd lng="es"><![CDATA[Phyllobrissus burckhardti]]></kwd>
<kwd lng="es"><![CDATA[Encope michoacanensis]]></kwd>
</kwd-group>
</article-meta>
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