<?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>S0188-88972018000300231</article-id>
<article-id pub-id-type="doi">10.24275/uam/izt/dcbs/hidro/2018v28n3/aceves</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Two new species of gymnosomatous pteropods from the Gulf of California (Gymnosomata: Pneumodermatidae)]]></article-title>
<article-title xml:lang="es"><![CDATA[Dos nuevas especies de pterópodos gimnosomados del Golfo de California (Gymnosomata: Pneumodermatidae)]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Angulo-Campillo]]></surname>
<given-names><![CDATA[Orso]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Aceves-Medina]]></surname>
<given-names><![CDATA[Gerardo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Instituto Politécnico Nacional Centro Interdisciplinario de Ciencias Marinas Departamento de Plancton y Ecología Marina]]></institution>
<addr-line><![CDATA[La Paz Baja California Sur]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2018</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2018</year>
</pub-date>
<volume>28</volume>
<numero>3</numero>
<fpage>231</fpage>
<lpage>237</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0188-88972018000300231&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0188-88972018000300231&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0188-88972018000300231&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  Background: The Gymnosomata is a group of mollusks adapted to pelagic life, which includes about 47 valid species worldwide. Zooplankton tows in the Gulf of California during January 2007 led to the collection of specimens of two different species of Gymnosomata with morphologic characters that did not belong to any species previously described.  Goals: To describe, based on radular characteristics, two new species of gymnosomatous mollusks collected at the central portion of the Gulf of California, Mexico.  Methods: Ten specimens of Gymnosomata were obtained with zooplankton tows using a Bongo net system. All the organisms described were identified as adult stages. Three specimens were dissected, and their buccal mass was removed and dissolved in 10% sodium hydroxide until the radula was isolated from the surrounding tissue. Posteriorly the radula was mounted for scanning electron micrographs.  Results: Two new species were described, Pneumoderma cicimarensis sp. nov. and Pneumodermopsis tacoi sp. nov.  Conclusions: Pneumoderma cicimarensis sp. nov. has a similar morphology to Pneumoderma pacificum Dall, 1871, but differs in the presence of one lobe on the median portion of the wing, a lack of chromatophores in the body and the shape of the radular teeth. Pneumodermopsis tacoi sp. nov. has a similar radula to Pneumodermopsis ciliata (Gegenbaur, 1855), but differs significantly in the number of rows of the radula and the shape of the central tooth.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  Antecedentes: Los Gymnosomata es un grupo de moluscos adaptado a la vida pelágica, que incluye unas 47 especies válidas en todo el mundo. En arrastres de zooplancton realizados en el Golfo de California durante enero de 2007, se recolectaron especímenes de dos especies diferentes de Gymnosomata con características morfológicas que no pertenecían a ninguna de las especies previamente descritas.  Objetivos: Describir con base en las características de la rádula, dos nuevas especies de moluscos gimnosomados recolectados en la porción central del Golfo de California, México.  Métodos: Diez especímenes de Gymnosomata fueron obtenidos de arrastres de zooplancton usando un Sistema de redes Bongo. Todos los organismos descritos se identificaron en estadio adulto. Tres especímenes fueron disectados y su masa bucal fue removida y disuelta en hidróxido de sodio al 10% hasta que la rádula quedara sin el tejido que la rodea. Posteriormente, la rádula fue montada para fotografías de microscopia electrónica.  Resultados: Se describieron dos nuevas especies, Pneumoderma cicimarensis sp. nov. y Pneumodermopsis tacoi sp. nov.  Conclusiones: Pneumoderma cicimarensis sp. nov., tiene una morfología similar a Pneumoderma pacificum Dall, 1871, pero difiere en la presencia de un lóbulo en la porción media del ala, la ausencia de cromatóforos en el cuerpo y en la forma de los dientes radulares. Pneumodermopsis tacoi sp. nov., tiene una rádula similar a la de Pneumodermopsis ciliata (Gegenbaur, 1855), pero difiere significativamente en el número de hileras de la rádula y en la forma de los dientes centrales.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[holoplanktonic molluscs]]></kwd>
<kwd lng="en"><![CDATA[new species]]></kwd>
<kwd lng="en"><![CDATA[Gymnosomata]]></kwd>
<kwd lng="en"><![CDATA[Pneumoderma]]></kwd>
<kwd lng="en"><![CDATA[Pneumodermopsis]]></kwd>
<kwd lng="es"><![CDATA[moluscos holoplanctónicos]]></kwd>
<kwd lng="es"><![CDATA[nuevas especies]]></kwd>
<kwd lng="es"><![CDATA[Gymnosomata]]></kwd>
<kwd lng="es"><![CDATA[Pneumoderma]]></kwd>
<kwd lng="es"><![CDATA[Pneumodermopsis]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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