<?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>S1405-33222025000100102</article-id>
<article-id pub-id-type="doi">10.18268/bsgm2025v77n1a021024</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Nuevo material de Nothrotheriops sp. (Mammalia: Xenarthra) de la fauna El Cedazo, Aguascalientes, México]]></article-title>
<article-title xml:lang="en"><![CDATA[New material of Nothrotheriops sp. (Mammalia: Xenarthra) from the El Cedazo fauna, Aguascalientes, Mexico]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vázquez]]></surname>
<given-names><![CDATA[Miguel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Montellano Ballesteros]]></surname>
<given-names><![CDATA[Marisol]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Barrón Ortiz]]></surname>
<given-names><![CDATA[Christina I.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ramos Heredia]]></surname>
<given-names><![CDATA[Jesús E.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Escoto Moreno]]></surname>
<given-names><![CDATA[Jaime A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Guardabosques de Los Cobos, A.C.  ]]></institution>
<addr-line><![CDATA[Aguascalientes Aguascalientes]]></addr-line>
<country>México</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Geología Departamento de Paleontología]]></institution>
<addr-line><![CDATA[Ciudad de México ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Royal Alberta Museum Quaternary Studies Program ]]></institution>
<addr-line><![CDATA[Edmonton Alberta]]></addr-line>
<country>Canada</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Universidad Autónoma de Aguascalientes Departamento de Biología ]]></institution>
<addr-line><![CDATA[Aguascalientes Aguascalientes]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2025</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2025</year>
</pub-date>
<volume>77</volume>
<numero>1</numero>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-33222025000100102&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-33222025000100102&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-33222025000100102&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN En la década de los setenta Mooser y Dalquest (1975) describieron la fauna local El Cedazo, recuperada en los alrededores de Aguascalientes, a la cual asignaron una edad illinoiana. Entre el material de mamíferos descrito identificaron un diente y elementos postcraneales como pertenecientes al perezoso terrestre Nothrotherium cf. N. shastensis. Recientemente, una mandíbula casi completa de Nothrotheriops fue recolectada por uno de los autores (MV) en el arroyo Cobos, uno de los barrancos donde se ha recuperado la fauna local de El Cedazo. Esta mandíbula conserva ambas ramas con tres molariformes cada una, carece de la porción predental; además está asociado un radio y varias vértebras. La comparación de este ejemplar con la especie irvingtoniana N. texanus y con la forma rancholabreana N. shastensis, revelan algunas diferencias y similitudes. La serie dental es más pequeña que la de los perezosos juveniles de N. shastensis de Rancho La Brea (California) y Cueva de San Josecito (Nuevo León), y es similar a N. texanus de Leisey Shell Pit (Florida). La proporción de la longitud dental total contra la profundidad de la mandíbula en el tercer molariforme es más similar a N. texanus que a N. shastensis. A diferencia de ambas especies, la rama ascendente es más elongada posteriormente, es la mitad de la longitud total de la mandíbula (sin la porción predental), y forma un ángulo de 136° con respecto a la horizontal alveolar. Puede ser que estas diferencias se deban al estado ontogenético, por lo que se requieren comparaciones con ejemplares juveniles y adultos de ambas especies para evaluar esta posibilidad. Se realizó un análisis de mesodesgaste, en los molariformes 2 y 3, dando como resultado un ángulo promedio de 108.8°, por lo que se puede inferir que este individuo tenía una alimentación mixta. Esto contrasta con estudios previos con excretas de N. shastensis, del suroeste de Estados Unidos, los cuales indican una dieta ramoneadora de vegetación xérica.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT In the 1970&#8217;s, Mooser and Dalquest (1975) described the El Cedazo local fauna recovered from the vicinity of the city of Aguascalientes, which they assigned to an Illinoian age. Among the described mammalian taxa was a small ground sloth identified as Nothrotherium cf. N. shastensis, represented by one tooth and some postcranial material. Recently, an almost complete lower jaw of Nothrotheriops was collected by one of the authors (MV) in Arroyo Cobos, one of the ravines that yielded the El Cedazo local fauna. The lower jaw preserves three molariforms on each side, unfortunately the mandibular spout is missing. A radius and some vertebrae are associated with the mandible. Comparison of this new specimen with the Rancholabrean N. shastensis and Irvingtonian N. texanus indicates some differences and similarities. The tooth row is smaller than juvenile sloths of N. shastensis from Rancho La Brea and San Josecito Cave, Rancholabrean but it is similar to N. texanus from the Irvingtonian Leisey Shell Pit 1A. The ratio of total alveolar length of the mandible against the depth of the mandible at the third molariform falls closer to N. texanus than to N. shastensis. Unlike both species of Nothrotheriops, the ascending ramus is elongated posteriorly, it is half of the total length of the lower jaw (without mandibular spout), and it forms an obtuse angle of 136° with respect to the alveolar tooth row. It is possible that these differences are ontogenetic in nature. The second and third molariforms of both sides of the mandible are sufficiently well preserved for mesowear analysis. Based on the mean mesowear angle 108.8°, this particular individual is inferred to have been a mixed feeder. These results are in contrast to previous studies on the feeding habits of N. shastensis from southwestern United States, which is suggested to have been a browser of xeric shrubs, based on plant remains preserved in fossil dung.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Nothrotheriops]]></kwd>
<kwd lng="es"><![CDATA[Fauna Cedazo]]></kwd>
<kwd lng="es"><![CDATA[Pleistoceno]]></kwd>
<kwd lng="es"><![CDATA[Aguascalientes]]></kwd>
<kwd lng="es"><![CDATA[México]]></kwd>
<kwd lng="en"><![CDATA[Nothrotheriops]]></kwd>
<kwd lng="en"><![CDATA[Fauna Cedazo]]></kwd>
<kwd lng="en"><![CDATA[Pleistocene]]></kwd>
<kwd lng="en"><![CDATA[Aguascalientes]]></kwd>
<kwd lng="en"><![CDATA[México]]></kwd>
</kwd-group>
</article-meta>
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