<?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>0034-7744</journal-id>
<journal-title><![CDATA[Revista de Biología Tropical]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. biol. trop]]></abbrev-journal-title>
<issn>0034-7744</issn>
<publisher>
<publisher-name><![CDATA[Universidad de Costa Rica]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0034-77442020000401185</article-id>
<article-id pub-id-type="doi">10.15517/rbt.v68i4.40340</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Profundulus chimalapensis, una nueva especie de pez ciprinodóntido (Cyprinodontiformes: Profundulidae) del Río Coatzacoalcos, México]]></article-title>
<article-title xml:lang="en"><![CDATA[Profundulus chimalapensis, a new species of cyprinodontid fish (Cyrpinodontiformes: Profundulidae) from the Coatzacoalcos River, Mexico]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Del-Moral-Flores]]></surname>
<given-names><![CDATA[Luis-Fernando]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[López-Segovia]]></surname>
<given-names><![CDATA[Eduardo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Hernández-Arellano]]></surname>
<given-names><![CDATA[Tao]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional Autónoma de México  ]]></institution>
<addr-line><![CDATA[ Estado de México]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Nacional Autónoma de México  ]]></institution>
<addr-line><![CDATA[ Ciudad de México]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2020</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2020</year>
</pub-date>
<volume>68</volume>
<numero>4</numero>
<fpage>1185</fpage>
<lpage>1197</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S0034-77442020000401185&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S0034-77442020000401185&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S0034-77442020000401185&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  Introducción:  El género Profundulusse considera endémico de la región Mesoamericana, desde el centro-sur del estado de Guerrero hasta la parte central de Honduras, habita principalmente en las cuencas superiores y cabeceras de los ríos de la vertiente Pacífica, con una menor diversidad en la Atlántica.  Objetivo: En este trabajo, basado en la comparación morfológica, proponemos una nueva especie, Profundulus chimalapensis sp. nov., confinada a México.  Métodos:  Se recolectaron ejemplares en los tributarios de la cuenca superior del Río Coatzacoalcos y se depositaron en colecciones de referencia. Se tomaron datos morfológicos (conteos, mediciones y características esqueléticas) y se compararon con especies relacionadas.  Resultados:  La nueva especie se diferencia de sus congéneres por tener la siguiente combinación de caracteres: 12-15 radios en la aleta dorsal, 14-17 radios anales y 13-16 pectorales; banda de color oscuro en los costados; aleta anal con un margen distal claro; margen anterior y posterior del proceso alveolar del premaxilar cóncavo; procesos epióticos cortos y anchos; base de la aleta anal grande, su longitud igual o mayor a la del pedúnculo caudal.  Conclusión:  La descripción de esta nueva especie de Profundulus de la vertiente atlántica del Istmo de Tehuantepec, sugiere que esta área ha sido un centro de especiación para el género.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  Introduction:  The genus Profundulus is considered a Mesoamerican endemic fish which spreading occurs, from the center-south of the state of Guerrero, Mexico, to the central part of Honduras. They mainly inhabit the upper basins and headwaters of the rivers of the Pacific slope, with less diversity in the Atlantic.  Objective:  This paper, based on morphological comparison we propose a new species, Profundulus chimalapensis sp. nov., confined to Mexico.  Methods:  Specimens were collected in the tributaries of the upper basin of the Coatzacoalcos River and were deposited in scientific collections. Morphological data (counts, measurements and skeletal features) were taken and compared with related species.  Results: The new species differs from its congeners by having the following combination of characters: 12-15 dorsal-fin rays, 14-17 anal- and 13-16 pectoral-fin rays; dark colored stripe on the flanks; anal fin with a clear distal margin; anterior and posterior margin of the alveolar process of the premaxilla concave; pair of short and wide epiotic processes; and large anal fin base, equal to or greater than length of caudal peduncle.  Conclusion:  The description of this new Profundulus species from Atlantic side of the Isthmus of Tehuantepec suggests that this area has been a center of speciation for the genus.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[ichthyology]]></kwd>
<kwd lng="en"><![CDATA[killifish]]></kwd>
<kwd lng="en"><![CDATA[morphology]]></kwd>
<kwd lng="en"><![CDATA[neotropical fish]]></kwd>
<kwd lng="en"><![CDATA[taxonomy]]></kwd>
<kwd lng="es"><![CDATA[Ictiología]]></kwd>
<kwd lng="es"><![CDATA[killis]]></kwd>
<kwd lng="es"><![CDATA[morfología]]></kwd>
<kwd lng="es"><![CDATA[pez neotropical]]></kwd>
<kwd lng="es"><![CDATA[taxonomía]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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