<?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>0065-1737</journal-id>
<journal-title><![CDATA[Acta zoológica mexicana]]></journal-title>
<abbrev-journal-title><![CDATA[Acta Zool. Mex]]></abbrev-journal-title>
<issn>0065-1737</issn>
<publisher>
<publisher-name><![CDATA[Instituto de Ecología A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0065-17372019000100123</article-id>
<article-id pub-id-type="doi">10.21829/azm.2019.3502057</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Variación intraespecífica en la probóscide de Polymorphus trochus (Polymorphida: Polymorphidae) de dos especies de aves dulceacuícolas (Gruiformes: Rallidae) en el Estado de México]]></article-title>
<article-title xml:lang="en"><![CDATA[Intraespecific variation in the proboscis of Polymorphus trochus (Polymorphida: Polymorphidae) in two species of freshwater birds (Gruiformes: Rallidae) in the State of Mexico]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Caballero-Viñas]]></surname>
<given-names><![CDATA[Carmen]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sánchez-Nava]]></surname>
<given-names><![CDATA[Petra]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Aguilar-Ortigoza]]></surname>
<given-names><![CDATA[Carlos]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rodríguez-Romero]]></surname>
<given-names><![CDATA[Felipe]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Autónoma del Estado de México Facultad de Ciencias Laboratorio de Sistemas Biosustentables]]></institution>
<addr-line><![CDATA[Toluca Estado de México]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Autónoma del Estado de México Facultad de Ciencias ]]></institution>
<addr-line><![CDATA[Toluca Estado de México]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2019</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2019</year>
</pub-date>
<volume>35</volume>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0065-17372019000100123&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0065-17372019000100123&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0065-17372019000100123&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Se utilizaron análisis de morfometría geométrica y lineal para evaluar la variación morfológica de la probóscide de Polymorphus trochus de Fulica americana y Gallinula galeata, ambas aves residentes del Humedal Chimaliapan, Estado de México. Los análisis de morfometría geométrica revelaron la existencia de distintos morfotipos de acuerdo con la especie de hospedero, el microhábitat, el sexo y el estado de desarrollo del parásito. Las hembras adultas se ubicaron en el íleon y presentaron una probóscide ensanchada, a diferencia de las hembras jóvenes, que se encontraron en el yeyuno y tuvieron una probóscide estrecha, muy similar a los machos; esto sugiere diseños distintos que se ajustan al movimiento migratorio de este grupo. La morfometría lineal también indicó diferencias en la longitud de la probóscide y los ganchos; además se identificó que las hembras presentan mayor tamaño de estas estructuras, como una adaptación hacia una fijación permanente para una adecuada maduración y posterior liberación de los huevos. De acuerdo con el presente estudio, la reproducción y la estructura del microhábitat son dos características importantes que influyen en el tamaño y forma de la probóscide. Adicionalmente, se indica que existen diferencias estadísticas en el dimorfismo sexual en diferentes niveles: forma y tamaño de la probóscide y longitud de los ganchos, datos no reportados para esta especie con anterioridad.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Geometric and linear morphometric analyses were used to evaluate the morphological variation of the proboscis of Polymorphus trochus of Fulica americana and Gallinula galeata, both resident birds of Chimaliapan Wetland, State of Mexico. The geometric morphometric analysis revealed the existence of different morphotypes according to host species, microhabitat, sex and state of development of the parasite. The adult females were located in the ileum and showed an enlarged proboscis, unlike the young females, which were found in the jejunum and had a narrow proboscis, very similar to the males; this suggests different designs that fit the migratory movement of this group. Linear morphometric also indicated differences in the length of the proboscis and the hooks; it was also identified that the females present a larger size of these structures, as an adaptation towards a permanent attachment to an adequate maturation and subsequent release of the eggs. According to the present study, the reproduction and structure of the microhabitat are two important traits that influence the size and shape of the proboscis. Additionally, it is indicated that there are statistical differences in the sexual dimorphism in different levels: shape and size of the proboscis and length of the hooks, data not reported for this species before.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Polymorphus trochus]]></kwd>
<kwd lng="es"><![CDATA[Acanthocephala]]></kwd>
<kwd lng="es"><![CDATA[probóscide]]></kwd>
<kwd lng="es"><![CDATA[dimorfismo sexual]]></kwd>
<kwd lng="es"><![CDATA[morfometría geométrica]]></kwd>
<kwd lng="en"><![CDATA[Polymorphus trochus]]></kwd>
<kwd lng="en"><![CDATA[Acanthocephala]]></kwd>
<kwd lng="en"><![CDATA[proboscis]]></kwd>
<kwd lng="en"><![CDATA[sexual dimorphism]]></kwd>
<kwd lng="en"><![CDATA[geometric morphometric]]></kwd>
</kwd-group>
</article-meta>
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