<?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>0188-8897</journal-id>
<journal-title><![CDATA[Hidrobiológica]]></journal-title>
<abbrev-journal-title><![CDATA[Hidrobiológica]]></abbrev-journal-title>
<issn>0188-8897</issn>
<publisher>
<publisher-name><![CDATA[Universidad Autónoma Metropolitana, División de Ciencias Biológicas y de la Salud]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0188-88972021000100107</article-id>
<article-id pub-id-type="doi">10.24275/uam/izt/dcbs/hidro/2021v31n1/velazquez</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Primer registro de Branchiostoma californiense (Cephalochordata: Branchiostomatidae), en un sistema estuarino-lagunar de Chiapas, México]]></article-title>
<article-title xml:lang="en"><![CDATA[First record of Branchiostoma californiense (Cephalochordata: Branchiostomatidae) in a lagoon-estuarine system from Chiapas, Mexico]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Velázquez-Velázquez]]></surname>
<given-names><![CDATA[Ernesto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Anzueto-Calvo]]></surname>
<given-names><![CDATA[Manuel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Domínguez-Cisneros]]></surname>
<given-names><![CDATA[Sara E.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad de Ciencias y Artes de Chiapas Instituto de Ciencias Biológicas ]]></institution>
<addr-line><![CDATA[Tuxtla Gutiérrez Chiapas]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>04</month>
<year>2021</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>04</month>
<year>2021</year>
</pub-date>
<volume>31</volume>
<numero>1</numero>
<fpage>107</fpage>
<lpage>110</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0188-88972021000100107&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0188-88972021000100107&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0188-88972021000100107&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN  Antecedentes:  Los anfioxos (Cephalochordata), son un grupo de organismos marinos de gran relevancia e interés en los estudios evolutivos, debido a su posición filogenética; habitan las zonas costeras alrededor del mundo y en el Pacífico oriental tropical se ha documentado la ocurrencia de dos especies Branchiostoma elongatum and B. californiense.  Objetivos:  El objetivo de este trabajo es documentar la ocurrencia de Branchiostoma californiense, en un sistema estuarino-lagunar de Chiapas, México.  Métodos:  Los ejemplares fueron recolectados en fondo arenoso entre 50 y 90 cm de profundidad, utilizando un tamiz de acero inoxidable, en el cordón estuarino del sistema estuarino-lagunar La Joya-Buenavista.  Resultados:  Se recolectaron un total de 19 especímenes de B. californiense; todos fueron estadios juveniles menores a 10mm de longitud (3.1-5.9 mm).  Conclusiones:  Estas observaciones constituyen los primeros registros de esta especie en las aguas continentales de Chiapas y representan los registros más sureños de esta especie en el Pacífico mexicano.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT  Background:  Amphioxi (Cephalochordata), are a group of marine organisms of great relevance and interest in evolutionary studies, due to their phylogenetic position; inhabit the sandy bottoms of coastal waters around the world. Two species Branchiostoma elongatum and B. californiense are widely distributed throughout the Tropical Eastern Pacific.  Objectives:  The objective of this work is to document the occurrence of Branchiostoma californiense, in a lagoon-estuarine system from Chiapas, Mexico.  Methods:  The specimens were collected from the sandy bottom between 50 and 90 cm deep, using a stainless-steel sieve in the estuarine channel of the estuarine-lagoon system La Joya-Buenavista.  Results:  A total of 19 specimens of B. californiense were collected. The specimens collected were juvenile stages less than 10mm in length (3.1-5.9 mm).  Conclusions:  These records indicate the first record of this species in the inland waters of Chiapas and represent the southernmost records of this species in the Mexican Pacific.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Anfioxo]]></kwd>
<kwd lng="es"><![CDATA[Pacífico mexicano]]></kwd>
<kwd lng="es"><![CDATA[La Joya-Buenavista]]></kwd>
<kwd lng="es"><![CDATA[nuevo registro]]></kwd>
<kwd lng="es"><![CDATA[Chiapas]]></kwd>
<kwd lng="en"><![CDATA[Amphioxus]]></kwd>
<kwd lng="en"><![CDATA[Mexican Pacific]]></kwd>
<kwd lng="en"><![CDATA[The Joya-Buenavista]]></kwd>
<kwd lng="en"><![CDATA[new record]]></kwd>
<kwd lng="en"><![CDATA[Chiapas]]></kwd>
</kwd-group>
</article-meta>
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