<?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>S0034-77442021000500438</article-id>
<article-id pub-id-type="doi">10.15517/rbt.v69isuppl.1.46383</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Redescription of the sea urchin Eucidaris thouarsii (Cidaroida: Cidaridae) based on material from the Mexican Pacific]]></article-title>
<article-title xml:lang="es"><![CDATA[Redescripción del erizo de mar Eucidaris thyarsii (Cidaroida: Cidaridae) basado en material del Pacífico mexicano]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ruiz-Nava]]></surname>
<given-names><![CDATA[Mariana-P.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Conejeros-Vargas]]></surname>
<given-names><![CDATA[Carlos-A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Solís-Marín]]></surname>
<given-names><![CDATA[Francisco-A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional Autónoma de México Facultad de Estudios Superiores Iztacala ]]></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>
<aff id="Af3">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Ciencias del Mar y Limnología ]]></institution>
<addr-line><![CDATA[ Ciudad de México]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>03</month>
<year>2021</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>03</month>
<year>2021</year>
</pub-date>
<volume>69</volume>
<fpage>438</fpage>
<lpage>451</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S0034-77442021000500438&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S0034-77442021000500438&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S0034-77442021000500438&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  Introduction: Eucidaris thouarsii is a cidaroid sea urchin found from the Gulf of California to Ecuador. Its taxonomy is based on general descriptions of test shape, primary and secondary spines, the Aristotle&#8217;s lantern, apical system, and peristome.  Objective:  To redescribe E. thouarsii with detailed descriptions, adding new taxonomic characters.  Methods:  We examined and reidentified 792 specimens, measuring and analyzing in detail structures of taxonomic value.  Results:  The horizontal diameter of the test ranges from 2.8 to 48.45 mm; the peristome corresponds to 40-60 % of that diameter, proportionally bigger than the apical system; the interambulacral areas are four times larger than the ambulacral areas. The variation of the pedicellariae is shown with scanning electron microscopy. The specimens of the Mexican oceanic islands are markedly different when compared to those of the mainland.  Conclusions: Eucidaris thouarsii has five well differentiated secondary spines, and also specific regionalization; the apical system varies according to the size of the Horizontal Diameter of the Test; the globiferous pedicellariae have intraspecific differences; and the tridentate pedicellariae are specifically regionalized.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  Introducción: Eucidaris thouarsii es una especie de erizo de mar, cidárido presente desde el Golfo de California hasta Ecuador. Su taxonomía está basada en descripciones generales de la forma de la testa, espinas primarias y secundarias, la linterna de Aristóteles, el sistema apical y peristoma.  Objetivo:  Redescribir E. thouarsii con descripciones detalladas, añadiendo nuevos caracteres taxonómicos.  Método:  Examinamos y reidentificamos 792 ejemplares, midiendo y analizando a detalle estructuras de valor taxonómico.  Resultados:  El diámetro horizontal de la testa va de 2.8 a 48 mm; el peristoma corresponde entre el 40-60% del diámetro horizontal de la testa, proporcionalmente más grande que el sistema apical; el área interambulacral es cuatro veces más grande que el área ambulacral. La variación en los pedicelarios se muestra con microscopía electrónica de barrido. Los ejemplares de las islas oceánicas mexicanas son claramente diferentes, comparados con los de la costa.  Conclusiones: Eucidaris thouarsii tiene cinco tipos bien definidos de espinas secundarias que se encuentran regionalizadas en la testa, el sistema apical varía de acuerdo con el diámetro horizontal de la testa, los pedicelarios globíferos tienen diferencias intraespecíficas y los pedicelarios tridentados estas específicamente regionalizados.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[cidaroids]]></kwd>
<kwd lng="en"><![CDATA[secondary spines]]></kwd>
<kwd lng="en"><![CDATA[pedicellariae]]></kwd>
<kwd lng="en"><![CDATA[morphology]]></kwd>
<kwd lng="en"><![CDATA[taxonomy]]></kwd>
<kwd lng="es"><![CDATA[cidáridos]]></kwd>
<kwd lng="es"><![CDATA[morfología]]></kwd>
<kwd lng="es"><![CDATA[pedicelarios]]></kwd>
<kwd lng="es"><![CDATA[morfología, taxonomía]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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</article>
