<?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>1870-3453</journal-id>
<journal-title><![CDATA[Revista mexicana de biodiversidad]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. Mex. Biodiv.]]></abbrev-journal-title>
<issn>1870-3453</issn>
<publisher>
<publisher-name><![CDATA[Instituto de Biología]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1870-34532021000100613</article-id>
<article-id pub-id-type="doi">10.22201/ib.20078706e.2021.92.3376</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Calpionélidos de la transición Berriasiano-Valanginiano en la Sección Padhi, centro-este de Hidalgo, México: sistemática y bioestratigrafía]]></article-title>
<article-title xml:lang="en"><![CDATA[Calpionellids of the Berriasian-Valaginian transition in the Padhi Section, central-eastern Hidalgo, Mexico: systematics and biostratigraphy]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Jiménez-López]]></surname>
<given-names><![CDATA[José Carlos]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[López-Martínez]]></surname>
<given-names><![CDATA[Rafael Antonio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Barragán]]></surname>
<given-names><![CDATA[Ricardo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Buitrón-Sánchez]]></surname>
<given-names><![CDATA[Blanca Estela]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Geología Unidad de Posgrado]]></institution>
<addr-line><![CDATA[Ciudad de México ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Geología ]]></institution>
<addr-line><![CDATA[Ciudad de México ]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2021</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2021</year>
</pub-date>
<volume>92</volume>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1870-34532021000100613&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1870-34532021000100613&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1870-34532021000100613&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Se estudia la sistemática y bioestratigrafía de 9 taxones de calpionélidos: Calpionella alpina Lorenz, 1902, Calpionellopsis simplex (Colom, 1939), C. oblonga (Colom, 1939), Tintinnopsella carpathica (Murgeanu y Filipescu, 1933), T. longa (Colom, 1939), T. subacuta (Colom, 1948), Remaniella cadischiana (Colom, 1948), R. catalanoi Pop, 1996 y Calpionellites darderi (Colom, 1934), procedentes de la sección Padhi, localizada entre los municipios de Tenango de Doria y Huehuetla, centro-este de Hidalgo, México. El análisis bioestratigráfico permitió delimitar una edad que comprende desde el Berriasiano tardío (zona Calpionellopsis, subzona Oblonga) hasta el Valanginiano temprano (zona Calpionellites, subzona Darderi). Estos registros se compararon con los de otras regiones de América del Norte, América del Sur, Europa, África noroccidental y Asia occidental. Los calpionélidos proceden de la parte basal de la Formación Tamaulipas Inferior (Cretácico Inferior) conformada por lutita y caliza con textura mudstone y wackestone, con facies que presentan radiolarios, espículas de esponjas, fragmentos de ostrácodos y moluscos.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract This work corresponds to the systematic and biostratigraphic study of 9 calpionellid taxa: Calpionella alpina Lorenz, 1902, Calpionellopsis simplex (Colom, 1939), C. oblonga (Colom, 1939), Tintinnopsella carpathica (Murgeanu y Filipescu, 1933), T. longa (Colom, 1939), T. subacuta (Colom, 1948), R. cadischiana (Colom, 1948), R. catalanoi Pop, 1996, and Calpionellites darderi (Colom, 1934) of the Padhi section, sited between the Tenango de Doria and Huehuetla municipalities, at the east-center region of Hidalgo, Mexico. The biostratigraphic analysis of the calpionellids allowed us to define an age ranging from the late Berriasian (Calpionellopsis zone, Oblonga subzone) to the early Valanginian (Calpionellites zone, Darderi subzone). These records were compared with those in other regions of North and South America, Europe, northwestern Africa, and western Asia. The calpionellids proceed from the lower part of the Tamaulipas Inferior Formation, and were studied from shale and limestone with mudstone and wackestone textures, with facies presenting radiolarians, sponge spicules, ostracods fragments, and mollusks.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Micropaleontología]]></kwd>
<kwd lng="es"><![CDATA[Cretácico temprano]]></kwd>
<kwd lng="es"><![CDATA[Estratigrafía]]></kwd>
<kwd lng="es"><![CDATA[Paleogeografía]]></kwd>
<kwd lng="en"><![CDATA[Micropaleontology]]></kwd>
<kwd lng="en"><![CDATA[Early Cretaceous]]></kwd>
<kwd lng="en"><![CDATA[Stratigraphy]]></kwd>
<kwd lng="en"><![CDATA[Paleogeography]]></kwd>
</kwd-group>
</article-meta>
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