<?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>S1405-33222017000200421</article-id>
<article-id pub-id-type="doi">10.18268/bsgm2017v69n2a7</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Musarañas del género Cryptotis (Eulipotyphla: Soricidae) en el Pleistoceno Tardío de los Andes Ecuatorianos]]></article-title>
<article-title xml:lang="en"><![CDATA[Shrews of the Cryptotis genus (Eulipotyphla: Soricidae) of the late Pleistocene in the Ecuadorian Andes]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Moreno Cárdenas]]></surname>
<given-names><![CDATA[Pablo A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Román-Carrión]]></surname>
<given-names><![CDATA[José Luis]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Escuela Politécnica Nacional Instituto de Ciencias Biológicas ]]></institution>
<addr-line><![CDATA[Quito ]]></addr-line>
<country>Ecuador</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Escuela Politécnica Nacional Instituto de Ciencias Biológicas Sección de Paleontología]]></institution>
<addr-line><![CDATA[Quito ]]></addr-line>
<country>Ecuador</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>2</numero>
<fpage>421</fpage>
<lpage>432</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-33222017000200421&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-33222017000200421&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-33222017000200421&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN Durante una excavación paleontológica en la Quebrada Chalán, provincia de Chimborazo, se registraron cinco fémures, cuatro húmeros, ocho huesos pélvicos, dos incisivos superiores y un fragmento de maxilar de Cryptotis, con las siguientes piezas dentarias: P4, M1 y M2. Los fósiles fueron colectados en los niveles superiores de la Formación Cangagua asignada al pleistoceno superior. En la fase de análisis se tomaron nueve medidas de los húmeros y los fémures comparándose con los de las especies ecuatorianas actuales. Los fósiles fueron asignados a la especie Cryptotis niausa, principalmente por la forma arqueada del segmento anterior de la fosa mesopterigoidea, así como las dimensiones similares a las de | en fémures, húmeros y maxilar. Durante el pleistoceno tardío C. niausa se distribuyó 160 km al sur de su ubicación actual. Sabemos que hoy, esta especie no está en la localidad del hallazgo paleontológico, debido a que su clima es más caliente y seco respecto a los páramos de pajonal húmedo donde habita actualmente. Este hallazgo demuestra que la localidad de Quebrada Chalán, tenía otro tipo de vegetación a finales del pleistoceno tardío durante el segundo y tercer interglaciar, similar a los páramos actuales cuyo pajonal se encuentran a partir de los 3200 m. El análisis morfológico del material fósil de C. niausa muestra una estructura ósea y muscular más robusta que los individuos de las poblaciones actuales. Algunos individuos fósiles presentan dimensiones más anchas de los fémures y los húmeros, asociadas a su mayor capacidad de cavar sus madrigueras y canales en suelos endurecidos producto de la marcada actividad volcánica.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT During a paleontological excavation in Chalán Gorge (Chimborazo province), some fossil of micromammals where registered, including, five femurs, four humerus, eight pelvic bones and a fragment of maxilla of Cryptotis, with P4, M1 and M2 dental pieces. The fossils where collected in higher levels of cangagua formation of upper pleistocene. Nine measures of humerus and femurs fossil where obtained, and compared with the current Ecuadorian species. The results showed that the fossils belonged to Cryptotis niausa species, by the arcuate shape of the anterior segment of the mesopterygoid fossa, as well as similar dimensions in femurs, humerus and maxillary bone of C. niausa. In the upper pleistocene C. niausa was distributed 160 km south of its current distribution. This species is not currently distributed in the find locality, because the climate is warmer and drier than the wet Andean grasslands where C. niausa now lives. This finding demonstrates that Chalán Gorge had other vegetation in the late pleistocene during the second and third interglacial ages, similar to current Andean grasslands whose &#8220;pajonales&#8221; are above 3200 meters. Morphological analysis of fossil C. niausa shows individuals with bones structure and muscle more robust than the current populations. Some Cryptotis fossils individuals have wider dimensions of the femurs and humerus, associated with an increased ability to dig their burrows and channels on hard soils result of strong volcanic activity.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Chimborazo]]></kwd>
<kwd lng="es"><![CDATA[Cuaternario]]></kwd>
<kwd lng="es"><![CDATA[Post-cráneo]]></kwd>
<kwd lng="es"><![CDATA[Quebrada Chalán]]></kwd>
<kwd lng="es"><![CDATA[Valle Interandino]]></kwd>
<kwd lng="en"><![CDATA[Chimborazo]]></kwd>
<kwd lng="en"><![CDATA[Quaternary]]></kwd>
<kwd lng="en"><![CDATA[Post-cranium]]></kwd>
<kwd lng="en"><![CDATA[Chalan Gorge]]></kwd>
<kwd lng="en"><![CDATA[Interandean Valley]]></kwd>
</kwd-group>
</article-meta>
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