<?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>S0034-77442019000500101</article-id>
<article-id pub-id-type="doi">10.15517/rbt.v67is5.38934</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Morphological and molecular differences between the Amphiamerican populations of Antillesoma (Sipuncula: Antillesomatidae), with the description of a new species]]></article-title>
<article-title xml:lang="es"><![CDATA[Diferencias morfológicas y moleculares entre las poblaciones anfiamericanas de Antillesoma (Stephen &amp; Edmonds, 1972) (Sipuncula: Antillesomatidae), con la descripción de una nueva especie]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Silva-Morales]]></surname>
<given-names><![CDATA[Itzahí]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[López-Aquino]]></surname>
<given-names><![CDATA[Mónica-J.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Islas-Villanueva]]></surname>
<given-names><![CDATA[Valentina]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ruiz-Escobar]]></surname>
<given-names><![CDATA[Fernando]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Bastida-Zavala]]></surname>
<given-names><![CDATA[J.-Rolando]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad del Mar Laboratorio de Sistemática de Invertebrados Marinos (LABSIM) ]]></institution>
<addr-line><![CDATA[ Oaxaca]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad del Mar Laboratorio de Genética y Microbiología ]]></institution>
<addr-line><![CDATA[ Oaxaca]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>10</month>
<year>2019</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>10</month>
<year>2019</year>
</pub-date>
<volume>67</volume>
<fpage>101</fpage>
<lpage>109</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S0034-77442019000500101&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S0034-77442019000500101&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S0034-77442019000500101&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  Introduction: The sipunculans are a group of marine invertebrates that have been little studied in the tropical eastern Pacific (TEP). Antillesoma antillarum is a species belonging to the monospecific family Antillesomatidae, considered widely distributed in tropical and subtropical localities across the globe.  Objective:  The main objective of this work was to examine the morphological and molecular differences between specimens from both coasts of tropical America to clarify the taxonomy of this species.  Methods:  We examined the morphology with material from the Mexican Caribbean and southern Mexican Pacific. To perform molecular analyses, two sequences of the COI molecular marker were obtained from specimens collected in Panteón Beach, Oaxaca, southern Mexican Pacific, and compared with four sequences identified as A. antillarum in GenBank, all of them from different localities. A phylogenetic reconstruction was performed with the maximum likelihood method and genetic distances were calculated with the Kimura 2P model and compared to reference values.  Results:  The phylogenetic analysis revealed three different lineages of Antillesoma that are well supported by bootstrap values: Antillesoma antillarum sensu stricto from the Caribbean Sea and Florida; a sister group to the one represented by our samples from the Mexican Pacific; and a third group from Thailand.  Conclusion: Based on morphological traits and molecular data, Antillesoma mexicanum sp. nov. is described from the Mexican Pacific, differing from A. antillarum in the trunk papillae, color patterns and, additionally, the specimens from the Caribbean attain significantly bigger trunk sizes than the ones Pacific.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  Introducción: Los sipúnculos son un grupo de gusanos marinos sin segmentación poco estudiados en el Pacífico oriental tropical (POT). Antillesoma antillarum es una especie perteneciente a la familia monoespecífica Antillesomatidae la cual se consideraba que se distribuía ampliamente en distintas localidades tropicales y subtropicales del mundo.  Objetivo:  El objetivo principal del trabajo fue examinar las diferencias morfológicas y moleculares entre ejemplares de ambas costas de América.  Métodos:  Para el análisis morfológico se revisó material del Caribe mexicano y del Pacífico sur de México. Para los análisis moleculares se obtuvieron secuencias del marcador mitocondrial COI de ejemplares de A. mexicanum sp. nov. de la playa de Panteón en Puerto Ángel, Oaxaca del Pacífico sur de México; también se incluyeron cuatro secuencias de GenBank de A. antillarum de diferentes localidades para la comparación filogenética con el método de Máxima Verosimilitud. Se calcularon las distancias genéticas con el modelo Kimura 2P y fueron comparadas con valores de referencia.  Resultados:  El análisis filogenético evidenció tres linajes diferentes: Antillesoma antillarum sensu stricto del Mar Caribe y Florida, el grupo hermano representado por nuestra recolecta en el Pacífico mexicano y un tercer grupo de Tailandia.  Conclusión:  Basados en datos morfológicos y moleculares, Antillesoma mexicanum sp. nov. fue descrita para el Pacífico mexicano, que difiere de A. antillarum en las papilas del tronco, el patrón de coloración y, adicionalmente, los ejemplares del Caribe fueron significativamente más grandes que los del Pacífico mexicano.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[COI]]></kwd>
<kwd lng="en"><![CDATA[cryptic species]]></kwd>
<kwd lng="en"><![CDATA[genetic distances]]></kwd>
<kwd lng="en"><![CDATA[sipunculans]]></kwd>
<kwd lng="es"><![CDATA[COI]]></kwd>
<kwd lng="es"><![CDATA[distancias genéticas]]></kwd>
<kwd lng="es"><![CDATA[especies crípticas]]></kwd>
<kwd lng="es"><![CDATA[sipúnculos]]></kwd>
</kwd-group>
</article-meta>
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