<?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>S1405-33222025000200006</article-id>
<article-id pub-id-type="doi">10.18268/bsgm2025v77n2a010325</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Presencia de Aseptella tse nov. sp. (Brachiopoda, Productida) en el Viseano (Misisípico Medio) de México, primer registro del género para Norteamérica]]></article-title>
<article-title xml:lang="en"><![CDATA[Presence of Aseptella tse nov. sp. (Brachiopoda, Productida) from the Visean (Middle Mississippian) of Mexico, first record of the genus for North America]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sour-Tovar]]></surname>
<given-names><![CDATA[Francisco]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Quiroz-Barroso]]></surname>
<given-names><![CDATA[Sara Alicia]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Castillo-Espinoza]]></surname>
<given-names><![CDATA[Karla María]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional Autónoma de México Facultad de Ciencias Departamento de Biología Evolutiva]]></institution>
<addr-line><![CDATA[ CDMX]]></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>2</numero>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-33222025000200006&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-33222025000200006&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-33222025000200006&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN Se reporta la presencia del braquiópodo Aseptella tse nov. sp. en estratos del Viseano (Misisípico Medio) que afloran en la región de Santiago Ixtaltepec, Municipio de Nochixtlán, en el norte del Estado de Oaxaca. Este hallazgo representa el registro más antiguo del género Aseptella a nivel global y el primero para Norteamérica, previamente sólo se conocía para localidades de Europa (España), Sudamérica (Argentina) y en el sudeste asiático (Tailandia). Reconociéndose en Aseptella un patrón de distribución cosmopolita, su presencia en México, en conjunto con otros taxa que se han reportado para las mismas localidades, se infiere la existencia, a lo largo del Carbonífero, de conexiones paleobiogeográficas entre las regiones en que se ha encontrado. En particular, su presencia en Norteamérica y Sudamérica se explica con un modelo en el que los márgenes del sureste de Báltica y los del noroeste de Gondwana se acercan paulatinamente entre sí por efecto de la Deriva Continental, quedando conectados por mares someros durante el evento glacial, conocido como la Era del Hielo del Paleozoico Tardío (LPIA), ocurrido durante el Misisípico-Pensilvánico.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT The presence of the brachiopod Aseptella tse nov. sp. is reported in Visean (Middle Mississippian) strata outcropping in the Santiago Ixtaltepec region, Nochixtlán Municipality, in the northern part of the State of Oaxaca. This discovery represents the oldest record of the genus Aseptella globally and the first from North America. Previously, it was only known from localities in Europe (Spain), South America (Argentina), and Southeast Asia (Thailand). Since Aseptella exhibits a cosmopolitan distribution pattern, its presence in Mexico, together with other taxa reported from the same localities, infers the existence of paleobiogeographic connections between the regions where it has been found throughout the Carboniferous. Specifically, its presence in North and South America is explained by a model in which the southeastern margins of Baltica and the northwestern margins of Gondwana gradually moved closer together due to Continental Drift, becoming connected by shallow seas during the glacial event known as the Late Paleozoic Ice Age (LPIA), which occurred during the Mississippian-Pennsylvanian.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Brachiopoda]]></kwd>
<kwd lng="es"><![CDATA[Aseptella]]></kwd>
<kwd lng="es"><![CDATA[Misisípico]]></kwd>
<kwd lng="es"><![CDATA[Oaxaca]]></kwd>
<kwd lng="es"><![CDATA[México]]></kwd>
<kwd lng="en"><![CDATA[Brachiopoda]]></kwd>
<kwd lng="en"><![CDATA[Aseptella]]></kwd>
<kwd lng="en"><![CDATA[Mississippian]]></kwd>
<kwd lng="en"><![CDATA[Oaxaca]]></kwd>
<kwd lng="en"><![CDATA[Mexico]]></kwd>
</kwd-group>
</article-meta>
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