<?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>S1405-33222017000100087</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[A new polycotylid plesiosaur with extensive soft tissue preservation from the early Late Cretaceous of northeast Mexico]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Frey]]></surname>
<given-names><![CDATA[Eberhard]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Mulder]]></surname>
<given-names><![CDATA[Eric W. A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Stinnesbeck]]></surname>
<given-names><![CDATA[Wolfgang]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rivera-Sylva]]></surname>
<given-names><![CDATA[Héctor E.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Padilla-Gutiérrez]]></surname>
<given-names><![CDATA[José Manuel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[González-González]]></surname>
<given-names><![CDATA[Arturo Homero]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Staatliches Museum für Naturkunde Karl sruhe Geowissenschaftliche Abteilung ]]></institution>
<addr-line><![CDATA[Karlsruhe ]]></addr-line>
<country>Germany</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Museum Natura Docet Wonderryck Twente  ]]></institution>
<addr-line><![CDATA[Denekamp ]]></addr-line>
<country>Netherlans</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universität Heidelberg, Institut für Geowissenschaften  ]]></institution>
<addr-line><![CDATA[Heidelberg ]]></addr-line>
<country>Germany</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Museo del Desierto  ]]></institution>
<addr-line><![CDATA[Saltillo ]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2017</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2017</year>
</pub-date>
<volume>69</volume>
<numero>1</numero>
<fpage>87</fpage>
<lpage>134</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-33222017000100087&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-33222017000100087&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-33222017000100087&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract A nearly complete skeleton of a polycotylid plesiosaur is described from the early Late Cretaceous laminated limestones at Vallecillo, northeast Mexico. It shows extensive soft tissue preservation. In some exceedingly well preserved areas there are transversely elongate rectangular to trapezoid millimetric scale-like structures arranged in longitudinal rows. The trailing edge skin flap preserves fibers and scale rows perpendicular to the trailing edge. A thick layer of subdermal tissue is present, especially along the tail base. It was responsible for the hydrodynamic drop-shaped body contour, with the body and tail forming a single unit. The body shape determined from the preserved soft tissues suggests a swimming speed similar to extant leatherback turtles. Based on the unique osteology of the palate, which is intermediate between Dolichorhynchops and Trinacromerum , and according to the unique morphology of the girdles and propodials as well as the medially converging gastralia, the new specimen is placed in a new genus and species of Polycotylidae, Mauriciosaurus fernandezi gen. et sp. nov.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Se describe el esqueleto casi completo de un nuevo plesiosaurio polycotílido. El ejemplar procede de las calizas laminares de Vallecillo del noreste de México y fue asignada estratigráficamente a la parte temprana del Cretácico Tardío. En las porciones mejor preservadas de las partes blandas se identificaron estructuras milimétricas, alarga das transversalmente de forma rectangular a trapezoidal, y con orden longitudinal. En la solapa, el borde posterior de la piel preserva fibra y escamas, ordenadas en filas y perpendiculares al borde de salida. Se identificó una capa de tejido subdermal, la que es particularmente gruesa en la base de la cola y debe haber contribuido al contorno hidrodinámico en forma de gota del animal, formándose una entidad entre el cuerpo y la cola. De acuerdo con el contorno y los teji dos blandos, se presume que la velocidad del animal debe de haberse aproximada a la de una tortuga laúd. La enigmática osteología del paladar, intermedio entre Dolichorhynchops y Trinacromerum , la morfología única de los cinturones y propodiales, igual que las vértebras gastrales medialmente convergentes, permiten asignar el nuevo espécimen a un nuevo género y especie de los Polycotilidae, Mauriciosaurus fernandezi gen. et sp. nov.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Vertebrate palaeontology]]></kwd>
<kwd lng="en"><![CDATA[Plesiosauria]]></kwd>
<kwd lng="en"><![CDATA[Polycotylidae]]></kwd>
<kwd lng="en"><![CDATA[Late Cretaceous]]></kwd>
<kwd lng="en"><![CDATA[northeast Mexico]]></kwd>
<kwd lng="en"><![CDATA[soft tissue preservation]]></kwd>
<kwd lng="en"><![CDATA[palaeoecology]]></kwd>
<kwd lng="es"><![CDATA[Paleontología de vertebrados]]></kwd>
<kwd lng="es"><![CDATA[Plesiosauria]]></kwd>
<kwd lng="es"><![CDATA[Poly cotylidae]]></kwd>
<kwd lng="es"><![CDATA[Cretácico Tardío]]></kwd>
<kwd lng="es"><![CDATA[noreste de México]]></kwd>
<kwd lng="es"><![CDATA[preservación de partes blandas]]></kwd>
<kwd lng="es"><![CDATA[paleoecología]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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