<?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>S1405-33222019000100193</article-id>
<article-id pub-id-type="doi">10.18268/bsgm2019v71n1a10</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Abies cuitlahuacii sp. nov. a mummified Late Quaternary fossil wood from Chalco, Mexico]]></article-title>
<article-title xml:lang="es"><![CDATA[Abies cuitlahuacii sp. nov., madera fossil momificada del Cuaternario tardío de Chalco, México]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cevallos-Ferriz]]></surname>
<given-names><![CDATA[Sergio, R.S.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ríos-Santos]]></surname>
<given-names><![CDATA[César]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Lozano-García]]></surname>
<given-names><![CDATA[Socorro]]></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 ]]></institution>
<addr-line><![CDATA[CDMX ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Geología ]]></institution>
<addr-line><![CDATA[CDMX ]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2019</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2019</year>
</pub-date>
<volume>71</volume>
<numero>1</numero>
<fpage>193</fpage>
<lpage>206</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-33222019000100193&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-33222019000100193&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-33222019000100193&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract A fragment of mummified wood collected from a Quaternary sedimentary sequence of Lake Chalco, Central Mexico, in the depocenter of the Basin (19°15&#697;26&#698;N, 98°58&#697;32&#698;W), has anatomical characteristics of Abies. Identification is based on the presence of a warty layer in the walls of the tracheids, prismatic crystals in ray cells, taxodioid pits in the cross-fields, and lack of ray tracheids and normal intercellular canals, among other well-preserved characteristics. This specimen represents the first macrofossil evidence of the genus in this region and suggests that by the Late Quaternary it was already established in the surroundings of Lake Chalco, and most probably in what is now central Mexico. Unfortunately, as with morphological and genetic characteristics, the anatomical attributes of the wood of the genus have not been useful for the delimitation of species. Most wood characteristics have been considered of little diagnostic value. However, comparison of available anatomical descriptions of fossil and living species highlight differences among them, even with Abies religiosa wood, which is the closest species to Lake Chalco. Other characteristics or plant organs are needed to assemble a whole plant that can be used to establish phylogenetic relationships and clarify the evolutionary history of the genus. Meanwhile this wood is assigned to a new fossil taxon, Abies cuitlahuacii Cevallos-Ferriz, Ríos-Santos &amp; Lozano-García.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Un fragmento de madera momificada recolectada de una sección de una secuencia sedimentaria del Lago de Chalco, en el centro de México, en particular en el depocentro de la Cuenca (19°15'26" N, 98°58'32" W), tiene características anatómicas de Abies. Esto se basa en la presencia de una capa verrugosa en las paredes de las traqueidas, cristales prismáticos en las células radiales, punteaduras taxodioides en los campos de cruce y ausencia de traqueidas radiales y canales normales, entre otras características bien preservadas. Este especímenrepresenta la primera evidencia con macrofósil del género en esta región y sugiere que para el Cuaternario tardío ya estaba establecido el género en los alrededores del Lago de Chalco y por lo tanto, en lo que hoy es el centro del país. Desafortunadamente, como ocurre con los caracteres morfológicos y genéticos, los atributos anatómicos de la madera del género tampoco han sido útiles para la delimitación de especies, ya que la mayoría de ellos son considerados poco diagnósticos. Sin embargo, en este estudio se hicieron comparaciones con maderas de especies fósiles y vivas disponibles, y en todas se encontraron diferencias anatómicas para con el ejemplar fósil, incluso con la madera de Abies religiosa que es la especie que tiene distribución más cercana al Lago de Chalco. En espera de que sean propuestos otros caracteres o estudios integrales de ellos que sirvan como auxiliaries para la delimitación de los miembros que constituyen al género, o de hallar otros órganos fósiles en la área de estudio que complementen la identificación aquí presentada, esta madera es asignada a una especie nueva, Abies cuitlahuaciiCevallos-Ferriz, Ríos-Santos &amp; Lozano-García.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[wood]]></kwd>
<kwd lng="en"><![CDATA[Lake Chalco]]></kwd>
<kwd lng="en"><![CDATA[anatomical characteristics]]></kwd>
<kwd lng="en"><![CDATA[Late Quaternary]]></kwd>
<kwd lng="en"><![CDATA[Abies cuitlahuacii]]></kwd>
<kwd lng="es"><![CDATA[Madera momificada]]></kwd>
<kwd lng="es"><![CDATA[Lago de Chalco]]></kwd>
<kwd lng="es"><![CDATA[características anatómicas]]></kwd>
<kwd lng="es"><![CDATA[Cuaternario tardío]]></kwd>
<kwd lng="es"><![CDATA[Abies cuitlahuacii]]></kwd>
</kwd-group>
</article-meta>
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