<?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>S0034-77442021000500423</article-id>
<article-id pub-id-type="doi">10.15517/rbt.v69isuppl.1.46382</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Morphological variability of recent species of the order Cassiduloida (Echinodermata: Echinoidea) of Mexico]]></article-title>
<article-title xml:lang="es"><![CDATA[Variabilidad morfológica de especies recientes del orden Cassiduloida (Echinodermata: Echinoidea) de México]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Caballero-Ochoa]]></surname>
<given-names><![CDATA[Andrea-Alejandra]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Buitrón-Sánchez]]></surname>
<given-names><![CDATA[Blanca-E.]]></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[Esteban-Vázquez]]></surname>
<given-names><![CDATA[Brenda-L.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<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[Jiménez-López]]></surname>
<given-names><![CDATA[José-Carlos]]></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 contrib-type="author">
<name>
<surname><![CDATA[Laguarda-Figueras]]></surname>
<given-names><![CDATA[Alfredo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional Autónoma de México Facultad de Ciencias ]]></institution>
<addr-line><![CDATA[ Ciudad de México]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Nacional Autónoma de México Posgrado en Ciencias Biológicas ]]></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 Geología, Departamento de Paleontología ]]></institution>
<addr-line><![CDATA[ Ciudad de México]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Universidad Nacional Autónoma de México Posgrado en Ciencias del Mar y Limnología ]]></institution>
<addr-line><![CDATA[ Ciudad de México]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af5">
<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="Af6">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Geología ]]></institution>
<addr-line><![CDATA[ Ciudad de México]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af7">
<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>423</fpage>
<lpage>437</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S0034-77442021000500423&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S0034-77442021000500423&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S0034-77442021000500423&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  Introduction:  In Mexico, there are two recorded living species of Cassiduloida: Cassidulus caribaearum and Rhyncholampas pacifica. Most of the taxonomic studies on cassiduloids have used external morphology, pedicellariae and morphometric characters; however, the intraspecific variation of quantitative and qualitative characters has been poorly evaluated.  Objective:  To compare the basic morphology of R. pacifica and C. caribaearum.  Methods:  We examined a total of 2 158 specimens of R. pacifica and C. caribaearum, selecting 50 to evaluate shape and size with linear regression and Principal Component analysis. We selected an additional 62 specimens per species to identify significant character correlations and morphological groups within species.  Results:  There is a direct relationship between Test length and Test width. Test height/Test width, and Total length (oral view)/Distance from the ambitus to the peristome apex, are the two main ratios to distinguish both species. C. caribaearum is more dorsoventrally compressed and has a round peristome base; versus R. pacifica has a tall and triangular one. There are four morphological groups of C. caribaearum and two groups for R. pacifica.  Conclusions:  These two species can be distinguished with reliable morphological characters, in which peristome shape suggests that R. pacifica is more adapted to burrowing deeper into certain types of substratum.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  Introducción:  En México, hay dos especies vivientes registradas de Cassiduloida: Cassidulus caribaearum y Rhyncholampas pacifica. La mayoría de los estudios taxonómicos sobre casiduloides han utilizado morfología externa, pedicelarios y caracteres morfométricos; sin embargo, la variación intraespecífica de caracteres cuantitativos y cualitativos ha sido poco evaluada.  Objetivo:  Comparar la morfología básica de R. pacifica y C. caribaearum.  Métodos:  Examinamos un total de 2 158 especímenes de R. pacifica y C. caribaearum, seleccionando 50 para evaluar la forma y el tamaño con regresión lineal y análisis de componentes principales. Seleccionamos 62 especímenes adicionales por especie para identificar correlaciones significativas de caracteres y grupos morfológicos dentro de las especies.  Resultados:  Existe una relación directa entre la longitud de la testa y el ancho de la testa. La Altura de la testa / Anchura de la testa y la Longitud total (vista oral) / Distancia desde el ambitus hasta el ápice del peristoma, son las dos proporciones principales para distinguir ambas especies. C. caribaearum está más comprimido dorsoventralmente y tiene una base del peristoma redonda; versus R. pacifica que tenía una alta y triangular. Hay cuatro grupos morfológicos de C. caribaearum y dos grupos de R. pacifica.  Conclusiones:  Estas dos especies se pueden distinguir con caracteres morfológicos confiables, en los que la forma del peristoma sugiere que R. pacifica está más adaptada para excavar más profundamente en ciertos tipos de sustratos.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Neognathostomata]]></kwd>
<kwd lng="en"><![CDATA[Cassiduloida]]></kwd>
<kwd lng="en"><![CDATA[morphometry]]></kwd>
<kwd lng="en"><![CDATA[Mexico]]></kwd>
<kwd lng="es"><![CDATA[Neognathostomata]]></kwd>
<kwd lng="es"><![CDATA[Cassiduloida]]></kwd>
<kwd lng="es"><![CDATA[morfometría]]></kwd>
<kwd lng="es"><![CDATA[México]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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