<?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>S1026-87742019000300321</article-id>
<article-id pub-id-type="doi">10.22201/cgeo.20072902e.2019.3.1162</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[A new species of Sigmodontinae (Rodentia) from the late Hemphillian of central Mexico, and comments on the possible radiation of this group]]></article-title>
<article-title xml:lang="es"><![CDATA[Una nueva especie de Sigmodontinae (Rodentia) del Henfiliano tardío del centro de México y comentarios sobre la posible radiación de este grupo]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pacheco-Castro]]></surname>
<given-names><![CDATA[Adolfo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Carranza-Castañeda]]></surname>
<given-names><![CDATA[Oscar]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Jiménez-Hidalgo]]></surname>
<given-names><![CDATA[Eduardo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional Autónoma de México Centro de Geociencias Posgrado en Ciencias de la Tierra]]></institution>
<addr-line><![CDATA[Juriquilla Querétaro]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Nacional Autónoma de México Centro de Geociencias ]]></institution>
<addr-line><![CDATA[Juriquilla Querétaro]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad del Mar Instituto de Recursos Laboratorio de Paleobiología]]></institution>
<addr-line><![CDATA[Oaxaca ]]></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>36</volume>
<numero>3</numero>
<fpage>321</fpage>
<lpage>333</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1026-87742019000300321&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1026-87742019000300321&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1026-87742019000300321&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT The Sigmodontinae subfamily represents one of the most diverse groups of mammals in the world; this rodent group evolved in the open and arid ecosystems of the Miocene of North America and was the most successful legion of mammals in the Great American Biotic Interchange. Part of its diversification occurred in the Mexican Pliocene, in the Hemphillian-Blancan boundary, where Prosigmodon and Sigmodon species are very common. Recent molecular phylogenetic systematics research proposes that Sigmodon is related to South American sigmodontines, while studies of classical morphometry in isolated molar teeth consider Prosigmodon as a junior synonymy of Sigmodon, which modifies the biogeographic and chronostratigraphic interpretations of this group in America. In this paper, we describe a new species of Prosigmodon from the late Hemphillian (~4.89 Ma) of central Mexico based on jaws, maxillary and complete isolated teeth. This is the most complete and austral record of the genus in North America. This species was compared with North American species of the Sigmodontinae and Neotominae subfamilies and we defined it as a new Prosigmodon species characterized by having a consistently present minute mesoloph in M1 and M2, in addition, there is an isolated metaconid from the protoconid in the m1 of young individuals. We performed a phylogenetic model using osteodental morphological characters focused on understanding the relationship between Prosigmodon (four species) and Sigmodon (eight species), also we included Baiomys (two species), Neotoma (two species), Peromyscus (two species), and Reithrodontomys (two species). Our results indicate that Prosigmodon is a monophyletic group if Sigmodon minor is included within the genus and P. chihuahuensis is excluded. The Mexican Prosigmodon species have more apomorphic characters with respect to S. minor and P. holocuspis. The species of Prosigmodon and Sigmodon are not closely related. The Sigmodon species are more closely related to the Neotoma species than to the species of Baiomys, Prosigmodon, Reithrodontomys and Peromyscus. Based on the topology of our cladogram and the stratigraphic ranges of the species of Sigmodontinae and Neotominae, we discuss that Baiomys, Prosigmodon, Reithrodontomys and Peromyscus probably diversified in the early Hemphillian (late Miocene), while Sigmodon and Neotoma did so during the late Pliocene.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN La subfamilia Sigmodontinae es uno de los grupos de mamíferos más diversos del mundo; este grupo de roedores evolucionó en los ecosistemas abiertos y áridos del Mioceno de Norteamérica y fue la legión de mamíferos más exitosa durante el Gran Intercambio Biótico Americano. Parte de esta diversificación ocurrió en México durante el Plioceno, en el límite Henfiliano-Blancano, siendo los representantes más comunes las especies pertenecientes a Prosigmodon y a Sigmodon. Trabajos recientes de sistemática filogenética molecular proponen que Sigmodon está relacionado con los sigmodontinos sudamericanos, mientras que estudios de morfometría clásica en fósiles de molares aislados consideran a Prosigmodon como una sinonimia de Sigmodon, lo que tiene un impacto importante en las interpretaciones biogeográficas y cronoestratigráficas de este grupo en América. En este manuscrito describimos una nueva especie de Prosigmodon del Henfiliano tardío (~4.9 Ma) del centro de México con base en mandíbulas, maxilares y dientes aislados completos. Este es el registro más completo del género y también el más austral en Norteamérica. Esta especie se comparó con especies norteamericanas de las subfamilias Sigmodontinae y Neotominae y la erigimos como una nueva especie de Prosigmodon caracterizada por tener un mesolofo pequeño consistentemente presente en el M1 y M2, además de que en el m1 de individuos jóvenes el metacónido está aislado del protocónido. Se realizó un modelo filogenético con base en caracteres morfológicos osteodentales para entender la relación entre Prosigmodon (cuatro especies) y Sigmodon (ocho especies) donde fueron incluidos también Baiomys (dos especies), Neotoma (dos especies), Peromyscus (dos especies) y Reithrodontomys (dos especies). Nuestros resultados indican que Prosigmodon es un grupo monofilético si se incluye Sigmodon minor y se excluye a P. chihuahuensis. Las especies de Prosigmodon mexicanas tienen caracteres apomórficos con respecto a S. minor y P. holocuspis. Las especies de Prosigmodon y Sigmodon no están cercanamente relacionadas, Sigmodon está más relacionado con las especies de Neotoma que con las especies de Baiomys, Prosigmodon, Reithrodontomys y Peromyscus. Con base en la topología de nuestro cladograma y los rangos estratigráficos de las especies de Sigmodontinae y Neotominae discutimos que Baiomys, Prosigmodon, Reithrodontomys y Peromyscus probablemente se diversificaron en el Henfiliano temprano (Mioceno tardío), mientras que Sigmodon y Neotoma lo hicieron durante el Plioceno tardío.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Rodentia]]></kwd>
<kwd lng="en"><![CDATA[Sigmodontinae]]></kwd>
<kwd lng="en"><![CDATA[Prosigmodon]]></kwd>
<kwd lng="en"><![CDATA[Late Hemphillian]]></kwd>
<kwd lng="en"><![CDATA[Central Mexico]]></kwd>
<kwd lng="en"><![CDATA[Phylogeny]]></kwd>
<kwd lng="es"><![CDATA[Rodentia]]></kwd>
<kwd lng="es"><![CDATA[Sigmodontinae]]></kwd>
<kwd lng="es"><![CDATA[Prosigmodon]]></kwd>
<kwd lng="es"><![CDATA[Henfiliano tardío]]></kwd>
<kwd lng="es"><![CDATA[centro de México]]></kwd>
<kwd lng="es"><![CDATA[filogenia]]></kwd>
</kwd-group>
</article-meta>
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