<?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>S1026-87742016000300297</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Roedores caviomorfos (Rodentia Hydrochoeridae) del Blancano temprano-tardío - Irvingtoniano de los estados de Guanajuato, Jalisco y Sonora, México: relación con Phugatherium dichroplax]]></article-title>
<article-title xml:lang="en"><![CDATA[Early-late Blancan - Irvingtonian caviomorph rodents (Rodentia Hydrochoeridae) from the states of Guanajuato, Jalisco and Sonora, Mexico and their relation to Phugatherium dichroplax]]></article-title>
</title-group>
<contrib-group>
<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-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional Autónoma de México  ]]></institution>
<addr-line><![CDATA[Juriquilla Querétaro]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2016</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2016</year>
</pub-date>
<volume>33</volume>
<numero>3</numero>
<fpage>297</fpage>
<lpage>315</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1026-87742016000300297&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1026-87742016000300297&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1026-87742016000300297&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Se describen los especímenes de roedores caviomorfos colectados en la secuencia sedimentaria de San Buenaventura, Blancano tardío de la cuenca de Tecolotlán, Jalisco. El estudio y comparación han demostrado que presentan caracteres diferentes y más progresivos que Neochoerus cordobae del Blancano temprano de San Miguel de Allende, Guanajuato, por lo que son referidos a una nueva especie Neochoerus occidentalis, que se caracteriza porque en el m2, el segundo prisma (pr. IIa), la hendidura terciaria interna (h.t.i.), ha dividido al prisma en el lado lingual y está formado por dos láminas aisladas, en el m3, la hendidura secundaria externa (h.s.e.), es mayor al 50% del prisma, y en m1 y m3, la hendidura secundaria interna (h.s.i.), la profundidad alcanza el 90% del prisma. Estos caracteres son compartidos por el espécimen colectado en los depósitos del Blancano tardío-Irvingtoniano de El Golfo de Santa Clara, Sonora, que es referida a Neochoerus occidentalis. Se discute la posición taxonómica de Neochoerus cordobae y Phugatherium dichroplax, especie del Blancano tardío de la fauna de 111 Ranch, Arizona. La presencia de Neochoerus occidentalis en faunas de Tecolotlán y El Golfo de Santa Clara, evidencian que la región occidental de México fue un corredor por donde los mamíferos migraban hacia la región norte de México y a la parte sur occidental de América del Norte.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract The Caviomorphs rodents collected in the late Blancan sedimentary sequence of San Buenaventura, in the Tecolotlán Basin, Jalisco, are described. The study and comparison with Neochoerus cordobae fossils collected in the early Blancan San Miguel Allende region have revealed that the Buenaventura specimens have more progressive characters than N. cordobae. Distinguishing features of the new species are: 1) the secondary internal flexid (h.t.i.), in the second prism of m2, divides the prism in two isolated plates; 2) the secondary external flexid (h.s.e.), in m3 exceeds 50% of the prism, and 3) the secondary internal flexid (h.s.i.), in both m1 and m3 has a 90% depth of the prism. These characters are shared with a specimen collected from late Blancan-Irvingtonian sedimentary deposits exposed at Golfo de Santa Clara, Sonora, which is referred to Neochoerus occidentalis. The taxonomic position of Neochoerus cordobae and Phugatherium dichroplax from the late Blancan fauna of 111 Ranch, Arizona is also discussed. The presence of Neochoerus occidentalis in Tecolotlán and in the Golfo de Santa Clara faunas is evidence that the western part of Mexico was a corridor where mammals migrated toward the northern region of Mexico and in general to the SW portion of North America.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Blancano tardío]]></kwd>
<kwd lng="es"><![CDATA[Neochoerus]]></kwd>
<kwd lng="es"><![CDATA[Hydrochoerus]]></kwd>
<kwd lng="es"><![CDATA[Phugatherium]]></kwd>
<kwd lng="es"><![CDATA[carpinchos, México]]></kwd>
<kwd lng="en"><![CDATA[late Blancan]]></kwd>
<kwd lng="en"><![CDATA[Neochoerus]]></kwd>
<kwd lng="en"><![CDATA[Hydrochoerus]]></kwd>
<kwd lng="en"><![CDATA[Phugatherium]]></kwd>
<kwd lng="en"><![CDATA[carpinchos, Mexico]]></kwd>
</kwd-group>
</article-meta>
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<year>2006</year>
<page-range>73-101</page-range><publisher-name><![CDATA[Universidad Nacional Autónoma de México, Instituto de Geología y Centro de Geociencias]]></publisher-name>
</nlm-citation>
</ref>
</ref-list>
</back>
</article>
