<?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>S1870-34532015000400872</article-id>
<article-id pub-id-type="doi">10.1016/j.rmb.2015.09.009</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Primer registro de un estípite de Coryphoideae: Palmoxylon kikaapoa de la Formación Olmos del Cretácico Superior, Coahuila, México]]></article-title>
<article-title xml:lang="en"><![CDATA[First record of a palm trunk Coryphoideae: Palmoxylon kikaapoa from the Olmos Formation of the Upper Cretaceous, Coahuila, Mexico]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sainz-Resendiz]]></surname>
<given-names><![CDATA[B. Alejandra]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Estrada-Ruiz]]></surname>
<given-names><![CDATA[Emilio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Mateo-Cid]]></surname>
<given-names><![CDATA[L. Elena]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Porras-Múzquiz]]></surname>
<given-names><![CDATA[Héctor]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Instituto Politécnico Nacional Escuela Nacional de Ciencias Biológicas Departamento de Zoología]]></institution>
<addr-line><![CDATA[México D.F.]]></addr-line>
<country>MX</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Instituto Politécnico Nacional Escuela Nacional de Ciencias Biológicas Departamento de Zoología]]></institution>
<addr-line><![CDATA[México D.F.]]></addr-line>
<country>MX</country>
</aff>
<aff id="A03">
<institution><![CDATA[,Instituto Politécnico Nacional Escuela Nacional de Ciencias Biológicas Departamento de Botánica]]></institution>
<addr-line><![CDATA[México D.F.]]></addr-line>
<country>MX</country>
</aff>
<aff id="A04">
<institution><![CDATA[,Museo de Múzquiz, A. C.  ]]></institution>
<addr-line><![CDATA[Múzquiz Coahuila]]></addr-line>
<country>MX</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2015</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2015</year>
</pub-date>
<volume>86</volume>
<numero>4</numero>
<fpage>872</fpage>
<lpage>881</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1870-34532015000400872&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1870-34532015000400872&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1870-34532015000400872&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[En sedimentos de la Formación Olmos del Cretácico Tardío (Campaniano superior) se ha recolectado una flora diversa representada por flores, frutos, hojas y maderas de angiospermas, gimnospermas y polypodiales, que documenta una flora de tipo paratropical. Del material recolectado recientemente, se da a conocer una especie fósil nueva de palma, asignada a Palmoxylon kikaapoa. El estípite permineralizado se caracteriza por presentar un atactostela con haces fibrovasculares simples de forma reniforme; 1-4 vasos del metaxilema con placa de perforación escalariforme y oblicua; 1-5 elementos de protoxilema con placa de perforación simple; parénquima paravascular desarrollado; floema en un solo conjunto; parénquima tabular con 2-8 capas de células alargadas; tejido fundamental aerenquimatoso tipo A; numerosos haces fibrosos en el tejido fundamental; estegmatas esféricas en filas discontinuas en la periferia de las fibras de los haces fibrovasculares y fibrosos. Estos caracteres anatómicos permitieron relacionarla taxonómicamente con la familia Arecaceae, subfamilia Coryphoideae y tribu Trachycarpeae. Tomando en cuenta los antecedentes paleobotánicos y botánicos, se infiere que la especie fósil se desarrolló bajo un clima tropical con un hábito de vida de tipo arbóreo.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[In sediments of the Olmos Formation from the Late Cretaceous (upper Campanian) a diverse flora represented by flowers, fruits, leaves and wood of angiosperms, gymnosperms and polypodiales has been collected, these records document the presence of a flora with paratropical affinities. Here we describe a new fossil palm species, Palmoxylon kikaapoa. The permineralized palm trunk is characterized by an atactostele with fibro-vascular bundles simple with reniform shape; with 1-4 vessels of metaxylem with scalariform and oblique perforation plates; 1-5 protoxylem elements with simple perforation plates; paravascular parenchyma developed; phloem in one phloem strad; tabular parenchyma with 2-8 layers of elongated cells; ground tissue consisting of thin-walled cells forming a not compact tissue with intercellular spaces, type A; numerous fibrous bundles in the fundamental tissue; spherical stegmata occur in discontinuous files next to fibro-vascular bundles or fibrous bundles. These anatomical characters allowed us to taxonomically relate the fossil to the family Arecaceae, subfamily Coryphoideae, and tribe Trachycarpeae. Taking into account paleobotanical and botanical evidence, we propose a tropical affinity and an arboreal habit for this fossil species.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Anatomy]]></kwd>
<kwd lng="en"><![CDATA[Arecaceae]]></kwd>
<kwd lng="en"><![CDATA[Upper Campanian]]></kwd>
<kwd lng="en"><![CDATA[Subfamily Coryphoideae]]></kwd>
<kwd lng="en"><![CDATA[Trachycarpeae]]></kwd>
<kwd lng="es"><![CDATA[Anatomía]]></kwd>
<kwd lng="es"><![CDATA[Arecaceae]]></kwd>
<kwd lng="es"><![CDATA[Campaniano superior]]></kwd>
<kwd lng="es"><![CDATA[Subfamilia Coryphoideae]]></kwd>
<kwd lng="es"><![CDATA[Trachycarpeae]]></kwd>
</kwd-group>
</article-meta>
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