<?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>0034-7744</journal-id>
<journal-title><![CDATA[Revista de Biología Tropical]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. biol. trop]]></abbrev-journal-title>
<issn>0034-7744</issn>
<publisher>
<publisher-name><![CDATA[Universidad de Costa Rica]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0034-77442021000500404</article-id>
<article-id pub-id-type="doi">10.15517/rbt.v69isuppl.1.46381</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Morphology of endoskeleton and spination in the sea star Midgardia xandaros (Brisingida: Brisingidae) from the Gulf of Mexico]]></article-title>
<article-title xml:lang="es"><![CDATA[Morfología del endoesqueleto y ornamentación de la estrella de mar Midgardia xandaros (Brisingida: Brisingidae) en el Golfo de México]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Esteban-Vázquez]]></surname>
<given-names><![CDATA[Brenda-Lizbeth]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[De-los-Palos-Peña]]></surname>
<given-names><![CDATA[Magdalena]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Solís-Marín]]></surname>
<given-names><![CDATA[Francisco-Alonso]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Laguarda-Figueras]]></surname>
<given-names><![CDATA[Alfredo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional Autónoma de México  ]]></institution>
<addr-line><![CDATA[ Ciudad de México]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Nacional Autónoma de México  ]]></institution>
<addr-line><![CDATA[ Ciudad de México]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Nacional Autónoma de México  ]]></institution>
<addr-line><![CDATA[ Ciudad de México]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>03</month>
<year>2021</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>03</month>
<year>2021</year>
</pub-date>
<volume>69</volume>
<fpage>404</fpage>
<lpage>422</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S0034-77442021000500404&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S0034-77442021000500404&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S0034-77442021000500404&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  Introduction:  The deep-sea asteroid species of Brisingida have a nearly global distribution but have remained poorly understood due to their deep bathymetric distributions and fragile skeletons.  Objective:  To describe the external and internal morphology of Midgardia xandaros including the skeletal arrangement, through multifocal and SEM techniques.  Methods:  We examined a total of 21 specimens, including 27 arm fragments, from the Gulf of Mexico and Honduras. Two specimens were dissected.  Results:  Detailed descriptions of pedicellariae, abactinal, intercostal, inferomarginal, adambulacral, ambulacral, odontophore, and oral ossicles, and their spines are provided, emphasizing the articulations and muscle attachments. C-shaped valves pedicellariae and small pedicellariae valves with shorter denticulation areas were recognized.  Conclusions:  The morphological description of M. xandaros is expanded, providing the most extensive description of abactinal, first adambulacral, first and subsequent inferomarginal ossicles, abactinal spines, and C-shaped, crossed pedicellariae, as well as the distal arm plates, for a brisingid species using SEM to date.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  Introducción:  Las estrellas de mar de profundidad del orden Brisingida tienen una distribución casi global, sin embargo, han sido poco estudiadas debido a su profunda distribución batimétrica y esqueleto frágil.  Objetivo:  Describir la morfología externa e interna de Midgardia xandaros incluyendo el arreglo de las placas del esqueleto mediante técnicas de microscopía multifocal y electrónica de barrido (MEB).  Métodos:  Se examinó un total de 21 ejemplares, incluyendo 27 fragmentos de brazos, provenientes del Golfo de México y Honduras. Dos de estos ejemplares fueron disectados.  Resultados:  Se presenta la descripción de pedicelarios; placas abactinales, intercostales, inferomarginales, adambulacrales, ambulacrales, orales y odontóforo, y sus espinas, enfatizando los sitios de articulaciones e inserción de músculos. Se reconocieron pedicelarios con valvas con forma de C, y pequeños pedicelarios cuyas valvas poseen áreas de denticulación cortas.  Conclusiones:  La descripción morfológica de M. xandaros es ampliada, presentado por primera vez la morfología de las placas abactinales, primera adambulacrales, primera y subsecuentes inferomarginales, espinas abactinales y pedicelarios con valvas con forma de &#8220;C&#8221;, así como las placas distales de los brazos para una especie del orden Brisingida.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[ossicles]]></kwd>
<kwd lng="en"><![CDATA[oral frame]]></kwd>
<kwd lng="en"><![CDATA[pedicellariae]]></kwd>
<kwd lng="en"><![CDATA[spines]]></kwd>
<kwd lng="en"><![CDATA[deep-sea]]></kwd>
<kwd lng="es"><![CDATA[osículos]]></kwd>
<kwd lng="es"><![CDATA[morfología interna]]></kwd>
<kwd lng="es"><![CDATA[pedicelarios]]></kwd>
<kwd lng="es"><![CDATA[espinas]]></kwd>
<kwd lng="es"><![CDATA[mar profundo]]></kwd>
</kwd-group>
</article-meta>
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