<?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>2007-3364</journal-id>
<journal-title><![CDATA[Therya]]></journal-title>
<abbrev-journal-title><![CDATA[Therya]]></abbrev-journal-title>
<issn>2007-3364</issn>
<publisher>
<publisher-name><![CDATA[Asociación Mexicana de Mastozoología A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2007-33642019000200155</article-id>
<article-id pub-id-type="doi">10.12933/therya-19-747</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[First contribution to the description of reproductive structures of Nelsonia goldmani (Rodentia: Cricetidae)]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[León-Tapia]]></surname>
<given-names><![CDATA[M. Ángel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cervantes]]></surname>
<given-names><![CDATA[Fernando A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Instituto de Ecología A. C.  ]]></institution>
<addr-line><![CDATA[Xalapa Veracruz]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Biología Departamento de Zoología]]></institution>
<addr-line><![CDATA[Ciudad de México ]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>08</month>
<year>2019</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>08</month>
<year>2019</year>
</pub-date>
<volume>10</volume>
<numero>2</numero>
<fpage>155</fpage>
<lpage>160</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-33642019000200155&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-33642019000200155&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-33642019000200155&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract: Nelsonia is a genus of rodent endemic to Mexican highlands with only two species: N. neotomodon (Western diminutive woodrat) and N. goldmani (Goldman´s diminutive woodrat). These species are taxonomically interesting because the few internal and external morphological differences were reported between them. Unfortunately, the scarcity of specimens and preserved internal organs available of these species limits the information to perform taxonomic studies. Hence, the objective of this study was to describe the reproductive structures in one specimen of N. goldmani collected in the biogeographic region known as Transmexican Volcanic Belt, located in the highlands of the central Mexico. We describe the external structures of the phallus and take nine measurements. The baculum was measured and described after using the classical methodology to clear, stain and preserve the whole phallus. The spermatozoa and inner testes were described using light microscopy, scanning electron microscopy, and histological techniques. Testicular volume was 319.64 mm3 and 1.34% of gonad somatic index. The phallus was relatively simple externally, laterally cylindrical, and dorsally resembling an elongated bottleneck. The baculum is an osseous structure with a cartilaginous part in its distal section. The sperm has a total mean length of 182.58 µm with an asymmetric head, a slight depression in its base and a large recurved hook. The histological analysis of testes indicated active spermatogenesis. We found important differences in the features and form of the phallic and baculum between N. neotomodon and N. goldmani. In N. goldmani some phallic forms were different, and some features measurements were greater than N. neotomodon. The external structures and the internal position of the baculum differ between the two species. In addition, the sperm size in N. goldmani was greater than other rodents, even those of larger corporal size like some species phylogenetically close as Neotoma genus.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: Nelsonia es un género de roedor endémico de las zonas altas de México con únicamente dos especies: N. neotomodon (rata enana del oeste) y N. goldmani (rata enana michoacana). Estas dos especies son taxonómicamente interesantes debido a las escasas diferencias morfológicas internas y externas reportadas. La escasez de especímenes y órganos internos preservados disponibles para estas especies provee información limitada para realizar estudios taxonómicos. Por lo tanto, el objetivo de este estudio fue describir las estructuras reproductivas de un espécimen de N. goldmani colectado en la región biogeográfica conocida como Faja Volcánica Transmexicana, ubicada en las zonas altas del centro de México. Se describieron las estructuras externas del falo y se tomaron nueve medidas. El báculo se midió y describió después de usar la metodología clásica para aclarar, teñir y preservarlo completo. Los espermatozoides y testículos se describieron usando microscopía óptica, microscopía electrónica de barrido y técnicas histológicas. El volumen testicular fue de 319.64 mm3 y un índice gonadosomático de 1.34 %. El falo es externamente simple, cilíndrico en vista lateral y parecido a un cuello de botella alargado en vista dorsal. El báculo es una estructura ósea con su sección distal cartilaginosa. Los espermatozoides tienen una longitud total promedio de 182.58 µm, la cabeza asimétrica, con una ligera depresión en su base y un largo gancho recurvado. Los análisis histológicos de los testículos indicaron una espermatogénesis activa. Se encontraron diferencias importantes entre las estructuras y forma del falo y báculo de N. neotomodon y N. goldmani. En N. goldmani algunas formas del falo fueron diferentes y algunas mediciones en las estructuras fueron mayores que en N. neotomodon. Las estructuras externas y la posición interna del báculo difieren entre las dos especies. Asimismo, el tamaño del espermatozoide en N. goldmani fue mayor que otros roedores, incluso aquellos de mayor tamaño corporal como algunas especies cercanamente relacionadas filogenéticamente como el género Neotoma.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Baculum]]></kwd>
<kwd lng="en"><![CDATA[histology]]></kwd>
<kwd lng="en"><![CDATA[phallus]]></kwd>
<kwd lng="en"><![CDATA[spermatozoa]]></kwd>
<kwd lng="en"><![CDATA[taxonomy]]></kwd>
<kwd lng="en"><![CDATA[testes]]></kwd>
</kwd-group>
</article-meta>
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