12.10.22

Nuevos datos sobre la fauna fósil del yacimiento triásico de El Atance en las XXXVII Jornadas de la SEP


Miembros del Grupo de Biología Evolutiva de la UNED han presentado durante las XXXVII Jornadas de Paleontología-V Congreso Ibérico de Paleontología, el trabajo titulado “New data on the girdles of the simosaurid Paludidraco multidentatus (Eosauropterygia), from the Upper Triassic of El Atance (Guadalajara, Spain)” en formato de comunicación oral. En esta comunicación se hace una puesta al día sobre el yacimiento paleontológico de El Atance, situado en las cercanías de Sigüenza (Guadalajara), destacando las últimas novedades presentadas en trabajos recientes sobre el mismo. En dicha comunicación, se han tratado temas como el contexto geológico y sedimentológico, el contexto paleoambiental y palinológico, o las diversas faunas fósiles halladas en el mismo, entre las cuales destacan dos nuevos taxones de sauropterigios descritos por miembros del equipo, siendo exclusivos del registro español. A continuación, os dejamos el resumen perteneciente a este trabajo:

The Carnian (Late Triassic) site of El Atance (Sigüenza, Guadalajara Province, Central Spain) stands out for its singularity within the vertebrate fossil sites known for the Triassic of the Iberian Peninsula, due to the recovered material consists on articulated skeletons preserved in three dimensions. In addition, the faunal assemblage identified there is, until now, exclusive of El Atance. Since its discovery in 2008, two excavation campaigns have been carried out in this palaeontological site, providing the first described eosauropterygian simosaurid (i.e., Paludidraco multidentatus) and placodont henodontid (i.e., Parahenodus atancensis) for the Iberian record, but also remains of other vertebrate taxa including indeterminate nothosaurs. Among the sauropterygian remains, P. multidentatus is the best represented taxon there, several articulated and relatively complete skeletons having been identified. Paludidraco multidentatus was briefly described based on a relatively complete skeleton (the holotype) and an isolated skull (the paratype), so its anatomy has not yet been characterized in detail. Paludidraco multidentatus was recognized as a bizarre sauropterygian. Thus, it was interpreted as an inhabitant of shallow littoral environments, showing adaptations for slow movement near the marine bottom and thus significantly differing from its sister taxon, Simosaurus gaillardoti (from the Ladinian of France and Germany), recognized as a generalist active predator. Hence, the different ecological roles inferred for these simosaurids (i.e. the only ones currently recognized as valid species) implied different locomotion modes and thus direct functional implications on their skeletal anatomy. In this work, an update of El Atance simosaurids is presented, providing detailed anatomical descriptions of both the pectoral and the pelvic girdles of the holotype of P. multidentatus, in order to characterize the features derived from its hyperspecialization and provide a comparative framework with its sister taxon S. gaillardoti.

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