<?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>0256-7024</journal-id>
<journal-title><![CDATA[Revista Geológica de América Central]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. Geol. Amér. Central]]></abbrev-journal-title>
<issn>0256-7024</issn>
<publisher>
<publisher-name><![CDATA[Universidad de Costa Rica]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0256-70242020000100001</article-id>
<article-id pub-id-type="doi">10.15517/rgac.v62i0.41278</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[First fossil record of a Megatheriidae-Megatheriinae in the Early Hemphillian (Late Miocene) from San Gerardo de Limoncito, Curré Formation, Costa Rica]]></article-title>
<article-title xml:lang="es"><![CDATA[Primer registro fósil de un Megatheriidae-Megatheriinae para el Hemphilliano (Mioceno Tardío) de San Gerardo de Limoncito, Formación Curré, Costa Rica]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rincón]]></surname>
<given-names><![CDATA[Ascanio D.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Valerio]]></surname>
<given-names><![CDATA[Ana L.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Laurito]]></surname>
<given-names><![CDATA[César A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Instituto Venezolano de Investigaciones Científicas (IVIC) Laboratorio de Paleontología Centro de Ecología]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Venezuela</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Museo Nacional de Costa Rica Sección de Geología Departamento de Historia Natural]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Costa Rica</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Instituto Nacional de Aprendizaje Centro Nacional Especializado en Turismo (CENETUR) ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Costa Rica</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Museo Nacional de Costa Rica Departamento de Historia Natural ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Costa Rica</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2020</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2020</year>
</pub-date>
<numero>62</numero>
<fpage>1</fpage>
<lpage>24</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S0256-70242020000100001&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S0256-70242020000100001&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S0256-70242020000100001&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract We report the first record of Megatheriidae-Megatheriinae fossil record in Central and North America, which also represents the earliest record of a Megatheriidae-Megatheriinae outside of South America at 5.8 Ma, and before the closure of the Isthmus of Panama. The fossil record of the Megatheriidae record comes the from Curré Formation, Late Hemphillian (Hh3) (Late Miocene), San Gerardo de Limoncito locality, Canton of Coto Brus, Puntarenas Province, Costa Rica, and shows a combination of plesiomorphic and advance characters whose combination is unique among the Megatheriinae. These Megatheriidae remains are scarce and fragmentary, however, they have enough morphological information and key morphological characters to allow us to propose a new genus and species of Megatheriinae, Sibotherium ka gen. et sp. nov. Based on the morphology preserved in these remains, Sibotherium ka is more closely related to Megathericulus, Pyramiodontheroium or Anisodontherium than to the more advanced Megatheriinae genera Urumaquia, Megatherium or Eremotherium. We explain the early record of this xenarthran in Costa Rica by the presence of a land corridor established for short periods of time as a result of tectonic uplift or by a drop in sea level or a mixture of both at approximately 5.8 Ma in Southern Central America.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Reportamos el primer registro fósil de Megatheriidae-Megatheriinae en América Central y del Norte, que además representa el registro más temprano de un Megatheriidae-Megatheriinae fuera de América del Sur con 5,8 Ma, y antes del cierre del Istmo de Panamá. El registro fósil de este Megatheriidae proviene de la Formación Curré, Hemphilliano tardío (Hh3) (Mioceno Tardío), de la localidad de San Gerardo de Limoncito, Cantón de Coto Brus, Provincia de Puntarenas de Costa Rica, y muestra una combinación de caracteres plesiomórficos y avanzados cuya combinación es única entre los Megatheriinae. Estos restos de Megatheriidae son escasos y fragmentarios, sin embargo, tienen suficiente información morfológica y caracteres morfológicos clave que nos permiten proponer un nuevo género y especie de Megatheriinae, que llamaremos Sibotherium ka gen. et sp. nov. En cuanto a la morfología preservada en estos restos, Sibotherium ka estaría más estrechamente relacionado con Megathericulus, Pyramiodontheroium o Anisodontherium que con los Megatheriinae más avanzados Urumaquia, Megatherium o Eremotherium. Explicamos el registro temprano de este Xenarthra en Costa Rica, mediante la presencia de un corredor terrestre, establecido por breves períodos de tiempo producto del levantamiento tectónico o una caída del nivel del mar o una mezcla de ambos, hace aproximadamente 5.8 Ma en América Central meridional.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Mammalia]]></kwd>
<kwd lng="en"><![CDATA[Xenarthra]]></kwd>
<kwd lng="en"><![CDATA[Megatheriinae]]></kwd>
<kwd lng="en"><![CDATA[Curré Formation]]></kwd>
<kwd lng="en"><![CDATA[Costa Rica]]></kwd>
<kwd lng="es"><![CDATA[Mammalia]]></kwd>
<kwd lng="es"><![CDATA[Xenarthra]]></kwd>
<kwd lng="es"><![CDATA[Megatheriinae]]></kwd>
<kwd lng="es"><![CDATA[Formación Curré]]></kwd>
<kwd lng="es"><![CDATA[Costa Rica]]></kwd>
</kwd-group>
</article-meta>
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