<?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>1026-8774</journal-id>
<journal-title><![CDATA[Revista mexicana de ciencias geológicas]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. mex. cienc. geol]]></abbrev-journal-title>
<issn>1026-8774</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional Autónoma de México, Instituto de Geología]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1026-87742015000200293</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Kimmeridgian pliosaurids (Sauropterygia, Plesiosauria) from Tlaxiaco, Oaxaca, southern Mexic]]></article-title>
<article-title xml:lang="es"><![CDATA[Pliosauridos kimmeridgianos (Sauropterygia, Plesiosauria) de Tlaxiaco, Oaxaca, sur de México]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Barrientos-Lara]]></surname>
<given-names><![CDATA[Jair Israel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Fernández]]></surname>
<given-names><![CDATA[Marta S.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Alvarado-Ortega]]></surname>
<given-names><![CDATA[Jesús]]></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 Posgrado en Ciencias Biológicas]]></institution>
<addr-line><![CDATA[Distrito Federal ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Nacional de La Plata Museo de La Plata División Paleontología de Vertebrados]]></institution>
<addr-line><![CDATA[La Plata ]]></addr-line>
<country>Argentina</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Geología Departamento de Paleontología]]></institution>
<addr-line><![CDATA[Distrito Federal ]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>08</month>
<year>2015</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>08</month>
<year>2015</year>
</pub-date>
<volume>32</volume>
<numero>2</numero>
<fpage>293</fpage>
<lpage>304</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1026-87742015000200293&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1026-87742015000200293&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1026-87742015000200293&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT Fossil remains of two specimens of the family Pliosauridae are described in the present manuscript. These fossils are from the Kimmeridgian shallow marine strata belonging to the informally known Sabinal formation deposited in the Tlaxiaco Basin, which are exposed in Yosobé, near Tlaxiaco town, Oaxaca State, southern Mexico. The first of these specimens consists of a fragment of premaxilla with teeth, which show diagnostic characters that allow its taxonomical identification as member of the genus Liopleurodon. The second specimen is preserved by a significantly higher number of bone elements; however, this is only identified as a member of the family Pliosauridae. Despite the shortage of the pliosaurs fossil record so far recovered in Yosobé, the specimens described here significantly contribute to the knowledge of this extinct group. On the one hand, these Kimmeridgian fossils are the southernmost representatives of these reptiles discovered in North America and the first collected in deposits of the Hispanic Corridor. On the other hand, the presence of the genus Liopleurodon in this fossil locality confirms its biogeographical distribution into the western domain of the Tethys Sea, beyond Europe.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN En este manuscrito se describen los restos fósiles de dos ejemplares de la familia Pliosauridae. Estos fósiles Kimmeridgianos provienen de los yacimientos marinos someros depositados en la Cuenca Tlaxiaco, pertenecientes a la formación Sabinal y que afloran la localidad Yosobé, cercana a la ciudad de Tlaxiaco, Estado de Oaxaca, al sur de México. El primero de estos ejemplares es un fragmento de la premaxila derecha con dientes, los cuales muestran caracteres diagnósticos que permiten su identificación taxonómica como miembro del genero Liopleurodon. El segundo ejemplar está compuesto de un número significativamente mayor de elementos óseos; sin embargo, sólo es posible identificar éste como un miembro de la familia Pliosauridae. A pesar de la escasez de los registros fósiles de pliosaurios hasta ahora recuperados en Yosobé, los ejemplares descritos aquí contribuyen de manera significativa al conocimiento de este grupo extinto. Por un lado, estos fósiles Kimmeridgianos son los representantes de estos reptiles más meridionales descubiertos en América del Norte y los primeros colectados en los yacimientos del Corredor Hispano. Por otro lado, la presencia del género Liopleurodon en este sitio confirma que su distribución biogeográfica alcanzó el dominio occidental del Mar de Tethys, más allá de Europa.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Pliosauridae]]></kwd>
<kwd lng="en"><![CDATA[Sabinal formation]]></kwd>
<kwd lng="en"><![CDATA[Jurassic]]></kwd>
<kwd lng="en"><![CDATA[Liopleurodon, Tlaxiaco]]></kwd>
<kwd lng="es"><![CDATA[Pliosauridae]]></kwd>
<kwd lng="es"><![CDATA[formación Sabinal]]></kwd>
<kwd lng="es"><![CDATA[Jurásico, Liopleurodon, Tlaxiaco]]></kwd>
</kwd-group>
</article-meta>
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