<?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>0124-5376</journal-id>
<journal-title><![CDATA[Biota colombiana]]></journal-title>
<abbrev-journal-title><![CDATA[Biota colombiana]]></abbrev-journal-title>
<issn>0124-5376</issn>
<publisher>
<publisher-name><![CDATA[Instituto Alexander von Humboldt]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0124-53762022000100301</article-id>
<article-id pub-id-type="doi">10.21068/2539200x.943</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Notes on the distribution, morphological variation, and mechanoreceptors of Tretanorhinus nigroluteus (Serpentes: Dipsadidae) in Colombia]]></article-title>
<article-title xml:lang="es"><![CDATA[Notas sobre la distribución, variación morfológica y mecanorreceptores de Tretanorhinus nigroluteus (Serpentes: Dipsadidae) en Colombia]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[García-Cobos]]></surname>
<given-names><![CDATA[Daniela]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vásquez-Restrepo]]></surname>
<given-names><![CDATA[Juan D.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Instituto de Investigación de Recursos Biológicos Alexander von Humboldt  ]]></institution>
<addr-line><![CDATA[Villa de Leyva Boyacá]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Geología ]]></institution>
<addr-line><![CDATA[Ciudad de México ]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2022</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2022</year>
</pub-date>
<volume>23</volume>
<numero>1</numero>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0124-53762022000100301&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0124-53762022000100301&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0124-53762022000100301&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Aquatic species are among the least studied groups of snakes in Colombia. This is mainly due to their ecology, which makes some species difficult to survey, resulting mostly in fortuitous encounters. Within this group is the genus Tretanorhinus, for which there are records of two species in Colombia, T. mocquardi and T. taeniatus, along with a possible third one, T. nigroluteus. The presence of T. nigroluteus in Colombia has been problematic, since records are based on misidentifications and incomplete information. Here we extend the distribution of this species to the Pacific region of Colombia and discuss the uncertainty of the previous record. We also compare the morphological variation of the only Colombian specimen currently known with individuals of Central America, finding that this individual differs in having a black dorsal ground color without punctulations and a darkened belly. Nonetheless, we consider this combination of scales and color as previously unknown intraspecific variation. Finally, we report for the first time the presence of dome-shaped cephalic mechanoreceptor sensilla for the genus, quantify its density and size for six cephalic scales, and discuss the possible taxonomic value of these structures.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Las especies acuáticas son uno de los grupos menos estudiados de serpientes en Colombia. Por su ecología, algunas de estas especies son difíciles de muestrear, siendo mayormente encuentros fortuitos. Dentro de este grupo se encuentra el género Tretanorhinus, del cual para Colombia hay registro de dos especies: T. mocquardi y T. taeniatus, y se ha sugerido la presencia de una tercera: T. nigroluteus. La presencia de T. nigroluteus en Colombia ha sido problemática, pues los registros han resultado ser identificaciones erróneas e información incompleta. Aquí actualizamos la distribución de esta especie para la región del Pacífico colombiano, y discutimos la incertidumbre del anterior registro. También comparamos la variación morfológica del único espécimen colombiano con la variación descrita para individuos de Centroamérica, encontrando que este individuo se diferencia por tener coloración dorsal negra sin puntos alternados y un vientre ennegrecido. Sin embargo, por la poca disponibilidad de individuos, consideramos la combinación de escamación y coloración de este espécimen como variación intraespecífica no conocida anteriormente. Finalmente, reportamos por primera vez la presencia de sensilas mecanorreceptoras cefálicas para el género, cuantificamos su densidad y tamaño en seis escamas de la región cefálica y discutimos su posible valor taxonómico.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Aquatic snakes]]></kwd>
<kwd lng="en"><![CDATA[Mechanoreceptor sensilla]]></kwd>
<kwd lng="en"><![CDATA[Neotropics]]></kwd>
<kwd lng="en"><![CDATA[Taxonomy]]></kwd>
<kwd lng="en"><![CDATA[Variation.]]></kwd>
<kwd lng="es"><![CDATA[Neotrópico]]></kwd>
<kwd lng="es"><![CDATA[Sensilas mecanorreceptoras]]></kwd>
<kwd lng="es"><![CDATA[Serpientes acuáticas]]></kwd>
<kwd lng="es"><![CDATA[Taxonomía]]></kwd>
<kwd lng="es"><![CDATA[Variación.]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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