<?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>S1405-33222013000300007</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[First record of Duvalia ex. gr. lata (Cephalopoda, Coleoidea) from Mexico]]></article-title>
<article-title xml:lang="es"><![CDATA[Primer registro de Duvalia ex. gr. lata (Cephalopoda, Coleoidea) en México]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Zell]]></surname>
<given-names><![CDATA[Patrick]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Beckmann]]></surname>
<given-names><![CDATA[Seija]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Stinnesbeck]]></surname>
<given-names><![CDATA[Wolfgang]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Flores-Ventura]]></surname>
<given-names><![CDATA[José]]></given-names>
</name>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Heidelberg University Institute for Earth Sciences ]]></institution>
<addr-line><![CDATA[Heidelberg ]]></addr-line>
<country>Germany</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2013</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2013</year>
</pub-date>
<volume>65</volume>
<numero>3</numero>
<fpage>527</fpage>
<lpage>531</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-33222013000300007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-33222013000300007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-33222013000300007&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Here we present the first record of the belemnite Duvalia ex. gr. lata (Cephalopoda, Coleoidea) from Mexico. The unique individual, a well-preserved rostrum, was discovered in Early Cretaceous strata of the Sierra de Parras close to Viesca in southwestern Coahuila. Duvalia ex. gr. lata was previously known from the Mediterranean Tethys. Our report extends the paleogeographic distribution of Duvalia to the western hemisphere and supports the hypothesis that the Hispanic Corridor was open during the Early Cretaceous, allowing for marine faunal exchange and migration between the Gulf of Mexico and the European Tethys.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Se reporta por primera vez el belemnite Duvalia ex. gr. lata (Cephalopoda, Coleoidea) en México. El único ejemplar, un rostro bien preservado, ha sido descubierto en capas del Cretácico Temprano de la Sierra de Parras,en las cercanías de Viesca, en el suroeste de Coahuila. Previamente, se conocía a Duvalia ex. gr. lata en el Tethys de la region mediterránea. Nuestro reporte extiende la distribución de Duvalia al hemisferio occidental y apoya la hipótesis de que el Corredor Hispánico permaneció abierto durante el Cretácico Temprano, lo cual permitió el intercambio de fauna marina y migraciones entre el Golfo de México y el Tethys europeo.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Duvalia]]></kwd>
<kwd lng="en"><![CDATA[belemnite]]></kwd>
<kwd lng="en"><![CDATA[Early Cretaceous]]></kwd>
<kwd lng="en"><![CDATA[Mexico]]></kwd>
<kwd lng="en"><![CDATA[Hispanic Corridor]]></kwd>
<kwd lng="es"><![CDATA[Duvalia]]></kwd>
<kwd lng="es"><![CDATA[belemnite]]></kwd>
<kwd lng="es"><![CDATA[Cretácico Temprano]]></kwd>
<kwd lng="es"><![CDATA[México]]></kwd>
<kwd lng="es"><![CDATA[Corredor Hispánico]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  	    <p align="justify"><font face="verdana" size="4">Art&iacute;culos</font></p> 	         <p align="center"><font face="verdana" size="2">&nbsp;</font></p> 	         <p align="center"><font face="verdana" size="4"><b>First record of <i>Duvalia</i> ex. gr. <i>lata</i> (Cephalopoda, Coleoidea) from Mexico</b></font></p>  	    <p align="center"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="center"><font face="verdana" size="3"><b>Primer registro de <i>Duvalia</i> ex. gr. <i>lata</i> (Cephalopoda, Coleoidea) en M&eacute;xico</b></font></p>          <p align="center"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="center"><font face="verdana" size="2"><b>Patrick Zell<sup>1,*</sup>, Seija Beckmann<sup>1</sup>, Wolfgang Stinnesbeck<sup>1</sup>, Jos&eacute; Flores&#45;Ventura<sup>2</sup></b></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><sup><i>1</i></sup><i> Institute for Earth Sciences, Heidelberg University, Im Neuenheimer Feld 234, 69120 Heidelberg, Germany. </i>* <a href="mailto:Patrick.Zell@geow.uni&#45;heidelberg.de">Patrick.Zell@geow.uni&#45;heidelberg.de</a>.</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><i><sup>2</sup> Santa Engracia 257, Fracc. Santa Elena, Saltillo C.P. 25015, Coahuila, M&eacute;xico.</i></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2">Manuscript received: July 19, 2013.    <br> 	Corrected manuscript received: August 12, 2013.    <br> 	Manuscript accepted: August 13, 2013.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Abstract</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Here we present the first record of the belemnite <i>Duvalia</i> ex. gr. <i>lata</i> (Cephalopoda, Coleoidea) from Mexico. The unique individual, a well&#45;preserved rostrum, was discovered in Early Cretaceous strata of the Sierra de Parras close to Viesca in southwestern Coahuila. <i>Duvalia</i> ex. gr. <i>lata</i> was previously known from the Mediterranean Tethys. Our report extends the paleogeographic distribution of <i>Duvalia</i> to the western hemisphere and supports the hypothesis that the Hispanic Corridor was open during the Early Cretaceous, allowing for marine faunal exchange and migration between the Gulf of Mexico and the European Tethys.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Keywords:</b> <i>Duvalia</i>, belemnite, Early Cretaceous, Mexico, Hispanic Corridor.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b>Resumen</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Se reporta por primera vez el belemnite <i>Duvalia</i> ex. gr. lata (Cephalopoda, Coleoidea) en M&eacute;xico. El &uacute;nico ejemplar, un rostro bien preservado, ha sido descubierto en capas del Cret&aacute;cico Temprano de la Sierra de Parras,en las cercan&iacute;as de Viesca, en el suroeste de Coahuila. Previamente, se conoc&iacute;a a <i>Duvalia</i> ex. gr. lata en el Tethys de la region mediterr&aacute;nea. Nuestro reporte extiende la distribuci&oacute;n de <i>Duvalia</i> al hemisferio occidental y apoya la hip&oacute;tesis de que el Corredor Hisp&aacute;nico permaneci&oacute; abierto durante el Cret&aacute;cico Temprano, lo cual permiti&oacute; el intercambio de fauna marina y migraciones entre el Golfo de M&eacute;xico y el Tethys europeo.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Palabras clave:</b> <i>Duvalia</i>, belemnite, Cret&aacute;cico Temprano, M&eacute;xico, Corredor Hisp&aacute;nico.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>1. Introduction</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Reports on belemnites (Coleoidea, Cephalopoda) from Mexico are rather scarce. Only Albian, and to a lesser extent Aptian neohibolitid belemnites, are well known (Kellum, 1937; Seibertz and Buitr&oacute;n, 1987; Spaeth, 1988; Seibertz and Spaeth, 1999, 2000, 2002, 2005, 2009). In addition, Late Jurassic belemnites are regularly mentioned (del Castillo and Aguilera, 1895; Burckhardt, 1930; Rogers <i>et al</i>., 1956; Tardy, 1972; Hose, 1981; Seibertz and Spaeth, 1999, 2009) but generally lack specific identification. Neocomian belemnites appear to be nearly absent except for some Hibolithes (Seibertz and Spaeth, 1999, 2000; Angeles&#45;Villeda, 2004). An overview of Mexican Jurassic and Cretaceous belemnites was given by Seibertz and Spaeth (1999, 2000, 2008, 2009). All Early Cretaceous belemnites belong to the Mesohibolitidae, while the Duvaliidae, except for citations by Seibertz and Spaeth (2000, 2008), appear to be unknown in Mexico.</font></p>  	    <p align="justify"><font face="verdana" size="2">Here we report the first record of <i>Duvalia</i> ex. gr. <i>lata</i> from Mexico. The genus is well known and is also a common component in the Mediterranean and Indo&#45;Pacific faunal Provinces from Bathonian to Aptian times (Late Jurassic &#150; Early Cretaceous), but was hitherto rarely mentioned from the western hemisphere (Pugaczewska, 1961; Stevens, 1965; Comb&eacute;morel, 1988, 1997; Mutterlose, 1992; Seibertz and Spaeth, 2008).</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>2. Material and preservation</b></font></p>  	    <p align="justify"><font face="verdana" size="2">The Mexican specimen is a well&#45;preserved rostrum which was collected by one of the authors (J.F.V.) in marine sediments of the lower Tamaulipas Formation, a carbonate dominated sediment sequence of hemipelagic origin, in the southwestern part of the Sierra de Parras, about 30 km northeast of the village of Viesca in southwestern Coahuila (25&deg;24.103' N &#150; 102&deg;32.290' E) (<a href="/img/revistas/bsgm/v65n3/html/a7figura1.html" target="_blank">Figure 1</a>). The precise layer of origin is not known, but associated ammonites such as Olcostephanus, would suggest an early Valanginian to early Hauterivian age. According to Imlay (1938, 1940) and Cant&uacute;&#45;Chapa (2009, 2012), occurrences of Olcostephanus in Mexico are restricted to this stratigraphic interval. This interpretation is supported by the belemnite described herein. The Mexican specimen of <i>Duvalia</i> is related to the species&#45;group of Duvalialata (de Blainville, 1827), a taxon known from the late Berriasian and early Valanginian of the Mediterranean Tethys.</font></p>          ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>3. Systematic paleotology</b></font></p>  	    <p align="justify"><font face="verdana" size="2">The specimen of <i>Duvalia</i> presented here is deposited in the Museo del Desierto, Saltillo, Coahuila, Mexico (CPC, Colecci&oacute;n de Paleontolog&iacute;a de Coahuila &#45; storage number CPC&#45;941).</font></p>  	    <p align="center"><font face="verdana" size="2">Class Cephalopoda Cuvier, 1795    <br> 	Subclass Coleoidea Bather, 1888    <br> 	Order Belemnitida Zittel, 1895    <br> 	Suborder Pachybelemnopseina Riegraf, 1998    <br> 	Family Duvaliidae Pavlow, 1914    <br> 	Genus <i>Duvalia</i> Bayle, 1878</font></p>  	    <p align="center"><font face="verdana" size="2"><b>Type species:</b> Belemnites dilatatus de Blainville, 1827</font></p>  	    ]]></body>
<body><![CDATA[<p align="center"><font face="verdana" size="2"><i>Duvalia</i> ex. gr. <i>lata</i> (de Blainville, 1827) <a href="/img/revistas/bsgm/v65n3/a7f2.jpg" target="_blank">Figure 2a&#45;f</a></font></p>          <p align="center"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2">3.1. Material</font></p>  	    <p align="justify"><font face="verdana" size="2">One rostrum (CPC&#45;941).</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2">3.2. Diagnosis</font></p>  	    <p align="justify"><font face="verdana" size="2">A medium&#45;sized and laterally compressed rostrum with a dorsal alveolar groove. The apex is pointed and the alveolar area straight, with a shallow alveolus. The cross&#45;section is rounded in the apical half of the rostrum but gradually becomes hexagonal and more laterally compressed towards the alveolar area.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2">3.3 Description</font></p>  	    <p align="justify"><font face="verdana" size="2">The rostrum is 41 mm long, up to 10.5 mm high and 7.2 mm wide. It is laterally compressed and presents a long and distinct dorsal groove. The apical region is pointed and the apex is incurved towards the dorsal side. Typically, as in most species that relate to <i>D. lata</i>, in lateral view, the dorsal side gently curves both into the apical as well as the alveolar side, while the ventral side incurves much more rapidly towards the apex. Laterally, the rostrum shows a faint ridge located in the middle of the flank, which gradually increases in strength towards the alveolar part. As a result, the laterally flattened cross&#45;section becomes increasingly hexagonal towards the alveolar opening. The alveolus is shallow. In both dorsal and ventral outlines, the rostrum is fusiform.</font></p>          ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2">3.4. Remarks</font></p>  	    <p align="justify"><font face="verdana" size="2">The subspecies Duvalialata constricta Uhlig, 1902, from the latest Berriasian of R&iacute;o Argos (Murcia, Spain), revised by Janssen (2003, pl. 6, figs. 12&#45;13), resembles our specimen. Its guard has a comparable duvaliid outline and a dorsal groove with comparable structure. The apex is oriented towards the dorsal side and the lateral sides are parallel to convex. Duvalialata de Blainville, 1827, from the Berriasian&#45;lower Valanginian of R&iacute;o Argos (Murcia, Spain) figured by Janssen (1997, p. 21&#45;23, pl. 1, figs. 1&#45;2) presents an alveolus which is deeper than in the Mexican specimen; the rostrum outline is more cylindrical and no characteristic constriction of the guard is present in the anterior part.</font></p>          <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2">3.5. Occurrence</font></p>  	    <p align="justify"><font face="verdana" size="2"><i>Duvalia</i> ex. gr. <i>lata</i> is an important faunal element of the Mediterranean Tethys and ranges from late Tithonian&#45;lowermost upper Valanginian as summarized by Janssen (1997) and Alsen and Mutterlose (2009).</font></p>  	    <p align="justify"><font face="verdana" size="2">The Mexican specimen was collected from the surface and likely weathered out of limestone and shale of the lower Tamaulipas Formation. The precise layer of origin is not known, but goethized inner whorls of ammonites collected at close distances to the belemnite rostrum are likely a result from the same sediment layer. They include Olcostephanus, an early Valanginian to early Hauterivian ammonite genus (Imlay, 1938, 1940; Cant&uacute;&#45;Chapa, 2009, 2012).</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>4. Discussion and conclusion</b></font></p>  	    <p align="justify"><font face="verdana" size="2">The Duvaliidae originated during the Bathonian (Middle Jurassic) in the central Tethys (Doyle <i>et al</i>., 1994). During the Late Jurassic and Early Cretaceous, members of the family migrated southwards and reached Madagascar (Comb&eacute;morel, 1988), and Antarctica (Mutterlose, 1986, 1988; Challinor and Hikuroa, 2007). <i>Duvalia</i> hispanica has been found by Seibertz (pers. com.) in Valanginian&#45;Hauterivian strata of the Cape Verde Island Maio, which confirms a migration pathway of duvaliids along the southern border of the Hispanic Corridor westwards into Mexico. The paleobiogeographic distribution of the genus <i>Duvalia</i> was summarized by Mutterlose (1992) and is shown in <a href="/img/revistas/bsgm/v65n3/a7f3.jpg" target="_blank">Figure 3</a> (with additional data from Mutterlose and Wiedenroth, 2008; Alsen and Mutterlose, 2009; Janssen (pers. com.); Seibertz (pers. com.)).</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Our specimen thus provides the first record of <i>Duvalia</i> ex. gr. <i>lata</i> in Mexico, which extends the paleogeographic distribution of this species to the western hemisphere. Our result supports the interpretation of an Early Cretaceous faunal connection between the Mediterranean Tethys and the Gulf of Mexico region. This migratory pathway, known as the Hispanic Corridor, has been postulated by Damborenea (2000) and Aberhan (2001). The latter is demonstrated by conspecific occurrences of ammonites (e.g. F&ouml;zy, 2004; Barrag&aacute;n and Maurasse, 2008; Cant&uacute; Chapa, 2009), belemnites (e.g. Seibertz and Spaeth, 2008), calpionellids (e.g. Trejo, 1960; Adatte <i>et al</i>., 1994, 1996), and other taxa on both sides of the North Atlantic. The occurrence of <i>Duvalia</i> ex. gr. <i>lata</i> gives additional evidence to support this faunal exchange during the Early Valanginian.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Acknowledgements</b></font></p>  	    <p align="justify"><font face="verdana" size="2">We acknowledge Ekbert Seibertz and Nico Janssen for their constructive reviews and Angelika Hering, Fabio Hering, Roland Hering, Carolin M&ouml;bus, Isabell Hubert and Dominik Schmith&uuml;sen for additional comments on this manuscript. Financial support of this research was provided by Deutsche Forschungsgemeinschaft (DFG) grant STI128&#45;17 and Heidelberg University Graduate Academy grant LGFG 2012&#45;9 (to P.Z.).</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>References</b></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">Aberhan, M., 2001, Bivalve palaeobiogeography and the Hispanic Corridor: time of opening and effectiveness of a proto&#45;Atlantic seaway: Palaeogeography, Palaeoclimatology, Palaeoecology, 165, 375&#45;394.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=1439270&pid=S1405-3322201300030000700001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">Adatte, T., Stinnesbeck, W., Remane, J., 1994, The Jurassic&#45;Cretaceous boundary in Northeastern Mexico. Confrontation and correlations by microfacies, clay minerals mineralogy, calpionellids and ammonites: Geobios, 27, 37&#45;56.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=1439272&pid=S1405-3322201300030000700002&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>  	    ]]></body>
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