<?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>1405-3322</journal-id>
<journal-title><![CDATA[Boletín de la Sociedad Geológica Mexicana]]></journal-title>
<abbrev-journal-title><![CDATA[Bol. Soc. Geol. Mex]]></abbrev-journal-title>
<issn>1405-3322</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Geológica Mexicana A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1405-33222017000100199</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Two new subfossil species of springsnails (Hydrobiidae: Pyrgulopsis) from North Mexico and their relation with extant species from Cuatrociénegas]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Czaja]]></surname>
<given-names><![CDATA[Alexander]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Estrada-Rodríguez]]></surname>
<given-names><![CDATA[José Luis]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Romero-Méndez]]></surname>
<given-names><![CDATA[Ulises]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Orona-Espino]]></surname>
<given-names><![CDATA[Anselmo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Juárez del Estado de Durango Facultad de Ciencias Biológicas ]]></institution>
<addr-line><![CDATA[Gómez Palacio Durango]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2017</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2017</year>
</pub-date>
<volume>69</volume>
<numero>1</numero>
<fpage>199</fpage>
<lpage>208</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-33222017000100199&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-33222017000100199&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-33222017000100199&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract We describe two new species of the genus Pyrgulopsis Call and Pilsbry from subfossil spring deposits of Viesca, Coahuila, in the northern part of Mexico. The first species, P. paleominckleyi sp. nov., has trochiform shells with flat whorls and bulbous shoulders. Extant endemic species Pyrgulopsis minckleyi (Taylor) displayssimilar shell features - this species was originally described as Nymphophilus minckleyi Taylor from the spring complex of the Cuatrociénegas valley, Coahuila. Some specimens of P. paleominckleyi sp. nov. show wing-like shoulders that have never been observed among fossil or extant members of the genus. In addition, shells of the second new species from Viesca, P. paleoacarinatus are similar to P. acarinatus, which is other endemic Pyrgulopsisspecies from Cuatrociénegas. We suppose that both sub-fossil springsnails of Viesca are sister species or, likely, direct precursors of the two extant endemic springsnails from Cuatrociénegas valley.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Se describen dos nuevas especies del género Pyrgulopsis Call and Pilsbry de depósitos subfósiles de Viesca, Coahuila, norte de México. La primera especie, P. paleominckleyi sp. nov., tiene conchas trochiformes con vueltas planas y hombros bulbosos. Conchas con características similares posee la especie endémica Pyrgulopsis minckleyi (Taylor), originalmente descrita como Nymphophilus minckleyi Taylor del complejo de pozas del valle de Cuatrociénegas, Coahuila. Algunos especímenes de P. paleominckleyi sp. nov. tienen hombros en forma de alas, características que nunca fueron observadas entre los miembros fósiles o recientes del género. Asimismo, las conchas de la segunda especie de Viesca, P. paleoacarinatus sp. nov. son muy similares a P. acarinatus, otra especie endémica de Pyrgulopsis de Cuatrociénegas. Suponemos que los caracoles subfósiles de Viesca son especies hermanas o, más probable, precursores directos de dos caracoles de manantial recientes y endémicos del valle de Cuatrociénegas.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Pyrgulopsis]]></kwd>
<kwd lng="en"><![CDATA[new species]]></kwd>
<kwd lng="en"><![CDATA[sub-fossil]]></kwd>
<kwd lng="en"><![CDATA[North Mexico]]></kwd>
<kwd lng="en"><![CDATA[Viesca]]></kwd>
<kwd lng="en"><![CDATA[Cuatrociénegas]]></kwd>
<kwd lng="es"><![CDATA[Pyrgulopsis]]></kwd>
<kwd lng="es"><![CDATA[especies nuevas]]></kwd>
<kwd lng="es"><![CDATA[subfósil]]></kwd>
<kwd lng="es"><![CDATA[Norte de México]]></kwd>
<kwd lng="es"><![CDATA[Viesca]]></kwd>
<kwd lng="es"><![CDATA[Cuatrociénegas]]></kwd>
</kwd-group>
</article-meta>
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