<?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>S1405-33222024000100003</article-id>
<article-id pub-id-type="doi">10.18268/bsgm2024v76n1a131223</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[First record of an Eomysticetidae from the El Cien Formation (late Oligocene), "Ten Minute" locality, Baja California Sur, Mexico]]></article-title>
<article-title xml:lang="es"><![CDATA[Primer registro de Eomysticetidae de la Formación El Cien (Oligoceno tardío), localidad "Ten Minute", Baja California Sur, México]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Solís-Añorve]]></surname>
<given-names><![CDATA[Azucena]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[González-Barba]]></surname>
<given-names><![CDATA[Gerardo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Buono]]></surname>
<given-names><![CDATA[Mónica R.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Schwennicke]]></surname>
<given-names><![CDATA[Tobias]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Díaz-Cruz]]></surname>
<given-names><![CDATA[Jesús Alberto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Autónoma de Baja California Sur Posgrado de Ciencias Marinas y Costeras ]]></institution>
<addr-line><![CDATA[La Paz Baja California Sur]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Autónoma de Baja California Sur  ]]></institution>
<addr-line><![CDATA[La Paz Baja California Sur]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Centro Nacional Patagónico Instituto Patagónico de Geología y Paleontología ]]></institution>
<addr-line><![CDATA[Puerto Madryn Provincia del Chubut]]></addr-line>
<country>Argentina</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Museo Paleontológico "Egidio Feruglio"  ]]></institution>
<addr-line><![CDATA[Trelew Chubut]]></addr-line>
<country>Argentina</country>
</aff>
<aff id="Af5">
<institution><![CDATA[,Universidad Autónoma de Baja California Sur Departamento Académico de Ciencias de la Tierra ]]></institution>
<addr-line><![CDATA[La Paz Baja California Sur]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af6">
<institution><![CDATA[,Universidad Autónoma de México Instituto de Biología Departamento de Zoología]]></institution>
<addr-line><![CDATA[Mexico City ]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2024</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2024</year>
</pub-date>
<volume>76</volume>
<numero>1</numero>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-33222024000100003&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-33222024000100003&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-33222024000100003&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT Eomysticetidae (Chaeomysticeti clade) is an archaic family of baleen whales that originated and diversified during the Oligocene epoch. The fossil record of this family is represented by at least 11 formally described species, including records in Baja California Sur (Mexico), Kaiserswerth (Germany), Kitakyushu (Japan), South Carolina (United States), and South Island (New Zealand). Baja California Sur (BCS) possesses important marine deposits from the upper Oligocene, which document a rich diversity of fossil mysticetes, including members of the family Eomysticetidae. In this work, we report a whale specimen collected in the upper Oligocene San Juan Member, El Cien Formation, from the so-called "Ten Minute locality", San Hilario, about 100 km NW of La Paz, Baja California Sur. The studied specimen consists of an incomplete skull, in which most of the rostrum and part of the occipital shield are missing but preserving one tympanic bulla in situ. This specimen is identified as belonging to the family Eomysticetidae based on both an elongated skull and nasals and transversely narrow and long intertemporal region with a wide exposure of parietals and frontals. The lack of more diagnostic regions precludes its identification at generic/specific levels. The specimen represents the first description of an eomysticetid for the San Hilario area, increasing our knowledge of the evolution of this group of mysticetes and its record in the Pacific basin from the late Oligocene of BCS.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN Los Eomysticetidae (clado Chaeomysticeti). son una familia arcaica de misticetos con barbas que se originó y diversificó durante el Oligoceno. El registro fósil de esta familia está representado por al menos 11 especies registradas en: Baja California Sur (México), Carolina del Sur (Estados Unidos), Kaiserswerth (Alemania), Kitakyushu (Japón), y la Isla del Sur (Nueva Zelanda). En particular, Baja California Sur (BCS), cuenta con importantes depósitos marinos del Oligoceno, que documentan una rica diversidad de misticetos fósiles, entre los cuales se destacan miembros de la familia Eomysticetidae. En este trabajo, se reporta la presencia de un ejemplar de misticeto proveniente del Oligoceno superior del Miembro San Juan, Formación El Cien, de la localidad llamada informalmente "Ten Minute" en San Hilario, que se encuentra a 100 kilómetros al NO 100 de La Paz, Baja California Sur. El ejemplar estudiado consiste en cráneo incompleto, donde la mayor parte del rostro y escudo occipital no están preservados; con bullas timpánicas in situ. Este ejemplar es asignado a la familia Eomysticetidae con base en la presencia de: un cráneo y nasales alargados, una región intertemporal trasversalmente angosta y larga con una amplia exposición de los parietales y frontales. Lo incompleto del espécimen no permite su determinación a nivel genérico y/o específico. Por último, el ejemplar representa la primera descripción de un eomisticétido para la localidad de San Hilario, ampliando el conocimiento de la evolución de este grupo de misticetos y su registro para la cuenca del Pacífico durante el Oligoceno tardío de BCS.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Mysticeti]]></kwd>
<kwd lng="en"><![CDATA[Oligocene]]></kwd>
<kwd lng="en"><![CDATA[San Hilario]]></kwd>
<kwd lng="en"><![CDATA[baleen whale]]></kwd>
<kwd lng="en"><![CDATA[El Cien]]></kwd>
<kwd lng="es"><![CDATA[Mysticeti]]></kwd>
<kwd lng="es"><![CDATA[Oligoceno]]></kwd>
<kwd lng="es"><![CDATA[San Hilario]]></kwd>
<kwd lng="es"><![CDATA[barbas]]></kwd>
<kwd lng="es"><![CDATA[El Cien]]></kwd>
</kwd-group>
</article-meta>
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<page-range>875-94</page-range></nlm-citation>
</ref>
</ref-list>
</back>
</article>
