<?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>S0188-88972018000200219</article-id>
<article-id pub-id-type="doi">10.24275/uam/izt/dcbs/hidro/2018v28n2/navarro</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Descripción morfológica del aparato bucal de adultos de Urotrygon nana y U. rogersi (Urotrygonidae): diferencias intraespecíficas e interespecíficas]]></article-title>
<article-title xml:lang="en"><![CDATA[Morphological description of adult mouthparts of Urotrygon nana and U. rogersi (Urotrygonidae): Interspecific and intraspecific differences]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Navarro-González]]></surname>
<given-names><![CDATA[Jessica Adriana]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rubio-Rodríguez]]></surname>
<given-names><![CDATA[Uriel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Mejía-Falla]]></surname>
<given-names><![CDATA[Paola Andrea]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cruz-Escalona]]></surname>
<given-names><![CDATA[Víctor Hugo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Instituto Nacional de Pesca y Acuacultura Centro Regional de Investigación Acuícola y Pesquera ]]></institution>
<addr-line><![CDATA[La Paz Baja California Sur]]></addr-line>
<country>México</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Instituto Politécnico Nacional Centro Interdisciplinario de Ciencias Marinas ]]></institution>
<addr-line><![CDATA[La Paz Baja California Sur]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Fundación colombiana para la investigación y conservación de tiburones y rayas  ]]></institution>
<addr-line><![CDATA[Cali ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>08</month>
<year>2018</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>08</month>
<year>2018</year>
</pub-date>
<volume>28</volume>
<numero>2</numero>
<fpage>219</fpage>
<lpage>222</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0188-88972018000200219&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0188-88972018000200219&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0188-88972018000200219&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  Antecedentes: Los dientes pueden cambiar significativamente de forma y tamaño, dependiendo de su posición en la mandíbula, de la edad y el sexo del organismo. Algunas veces, debido a la pérdida continua de éstos, se presenta una descripción incompleta de la morfología dentaria para varias especies de batoideos, lo cual dificulta evaluar diferencias intraespecíficas e interespecíficas.  Objetivos: Describir las diferencias en la morfología dentaria, así como la disposición de los dientes en adultos de dos especies de batoideos (Urotrygon nana y U. rogersi) distribuidos sobre los fondos blandos de la plataforma continental del océano Pacífico tropical mexicano.  Métodos: Se recolectaron las mandíbulas de diez individuos adultos de U. nana y de U. rogersi, se contó el número de filas y series de la primera hilera funcional y se realizó la descripción de la forma de los cartílagos y de los dientes. Además, se identificó el tipo de heterodoncia.  Resultados: Se observaron similitudes entre los cartílagos y los dientes de ambas especies. En ambos sexos de U. nana se presentó heterodoncia monognática y se observaron tres morfotipos dentarios en el palatocuadrado y dos en el cartílago de Meckel. Para U. rogersi se encontró una heterodoncia sexual con un solo morfotipo.  Conclusiones: Es necesario ampliar el número de muestra, a fin de considerar los diferentes estadios de vida, y desarrollar estudios de carácter etológico que aporten información sobre el comportamiento reproductivo de las especies.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  Background: Teeth can change significantly in shape and size depending on their position in the jaw, age and sex of the organism. Sometimes due to the loss of these teeth, an incomplete description of the dental morphology exists for several batoid species, which makes it difficult to evaluate intraspecific and interspecific differences.  Goals: Describe the differences in tooth morphology as well as the arrangement of teeth in adults of two species of batoids (Urotrygon nana and U. rogersi) distributed over soft bottoms of the continental shelf of the Mexican tropical Pacific.  Methods: After collecting the jaws of ten adult individuals of U. nana and U. rogersi we counted the number of rows and series of the first functional row, and described the shape of the cartilage and teeth. In addition, we identified the type of heterodonty.  Results: Similarities between the cartilage and teeth of both species were observed. In both sexes of U. nana monognatic heterodonty was observed, with three dental morphotypes in Palatocuadrado and two in Meckel&#8217;s cartilage. U. rogersi has sexual heterodonty with just one morph.  Conclusions: We believe it is necessary to expand the number of samples (taking into account the different stages of life), and generate additional ethological studies that provide information on the reproductive behavior of the species.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[batoideos]]></kwd>
<kwd lng="es"><![CDATA[dentición]]></kwd>
<kwd lng="es"><![CDATA[mandíbula]]></kwd>
<kwd lng="es"><![CDATA[morfología]]></kwd>
<kwd lng="en"><![CDATA[batoids]]></kwd>
<kwd lng="en"><![CDATA[dentition]]></kwd>
<kwd lng="en"><![CDATA[jaw]]></kwd>
<kwd lng="en"><![CDATA[morphology]]></kwd>
</kwd-group>
</article-meta>
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