Geowissenschaftliche Abteilung

Karlsruhe, Germany

Geowissenschaftliche Abteilung

Karlsruhe, Germany
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Stinnesbeck S.R.,Geowissenschaftliche Abteilung | Frey E.,Geowissenschaftliche Abteilung | Olguin J.A.,Institute La Prehistoria Of America | Stinnesbeck W.,University of Heidelberg | And 9 more authors.
Palaontologische Zeitschrift | Year: 2017

Here we describe a new genus and species of giant ground sloth, Xibalbaonyx oviceps (Megalonychidae, Xenarthra), from the drowned cave system of the northeastern Yucatán Peninsula. The specimen is Late Pleistocene in age and was discovered in the Zapote sinkhole (cenote) near Puerto Morelos in the Mexican state of Quintana Roo. Xibalbaonyx oviceps differs significantly from all hitherto known Megalonychidae including those from the Greater Antilles and South America. The new taxon suggests a local Caribbean radiation of ground sloths during the Late Pleistocene, which is consistent with the dispersal of the group along a Mexican corridor. © 2017 Paläontologische Gesellschaft


Frey E.,Geowissenschaftliche Abteilung | Elgin R.A.,Geowissenschaftliche Abteilung | Stinnesbeck W.,University of Heidelberg | Padilla-Gutierrez J.M.,Coleccion Paleontologica de Coahuila | And 3 more authors.
Revista Mexicana de Ciencias Geologicas | Year: 2012

Here we describe a second nyctosaurid pterosaur from the Late Cretaceous laminated limestone deposits of northeast Mexico. The specimen was discovered in the Múzquiz quarry area in northern Coahuila and comprises an isolated right wing skeleton including the humerus, radius/ulna, carpus, wing finger metacarpus and the proximal segment of wing finger phalanx I. The specimen is likely to be a primarily isolated wing, at least the basal wing finger phalanx of which was complete prior to collection. The specimen is referred to cf. Muzquizopteryx sp. on account of its humerus morphology, which is coincident with that of Muzquizopteryx coahuilensis, although a lack of diagnostic characters at the species level prevents any further identification. Its discovery from the Late Turonian deposits of northern Coahuila near Muzquíz, confirms it as the oldest nyctosaurid discovered to date.


Rivera-Sylva H.E.,Museo del Desierto | Frey E.,Geowissenschaftliche Abteilung
Boletin de la Sociedad Geologica Mexicana | Year: 2011

Here we report on the first mandible fragment of the giant alligatoroid eusuchian crocodyliform Deinosuchus found in Mexico. The specimen comes from Las Jicoteas locality, northwestern Coahuila. It was collected in 2007 by the first author. The fragment is from a left surangular, coming from the mandible of a Deinosuchus between six and seven metres in length.


Rivera-Sylva H.E.,Museo del Desierto | Frey E.,Geowissenschaftliche Abteilung | Guzman-Gutierrez J.R.,Institute Historia Natural Of Aguascalientes | Palomino-Sanchez F.,Instituto Nacional Of Estadistica | Stinnesbeck W.,University of Heidelberg
Revista Mexicana de Ciencias Geologicas | Year: 2011

Diagnostic remains of Deinosuchus have been discovered in the Aguja Formation (Late Cretaceous, late Campanian) near the town of La Salada (northwestern Coahuila, Mexico) and are described here for the first time. The material comprises six teeth and tooth fragments that were found associated with postcranial material such as two osteoderms and a cervical and caudal vertebra and is referred here to D. riograndensis. The association with a variety of herbivorous dinosaurs and trionychid turtles suggest a predator-prey interaction, which is confirmed by the occurrence of a vertebra with a Deinosuchus bite mark. The Deinosuchus remains from La Salada represent the southernmost occurrence of the genus known to date.

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