New ornithopod remains in the Bajo de la Carpa Formation (Santonian, Upper Cretaceous) from the La Escalonada area, northern Patagonia, Argentina.

PENÉLOPE CRUZADO-CABALLERO; CRISTINA JIMÉNEZ GOMIS; LEONARDO S. FILIPPI

Munich

Congreso; 15th European Association of Vertebrate Paleontologists; 2017

Palaeontological Museum Munich, Germany

New ornithopod remains in the Bajo de la Carpa Formation (Santonian, Upper Cretaceous) from the La Escalonada area, northern Patagonia, ArgentinaCristina Jimenez-Gomisa, Penélope Cruzado-Caballeroa, Leonardo S. Filippiba: CONICET ? IIPG (Instituto de Investigación en Paleobiología y Geología, UNRN-CONICET). Av. Roca 1242, General Roca, Río Negro, Argentinacjimenezgomis@gmail.com; pccaballero@unrn.edu.arb: Museo Municipal ?Argentino Urquiza?. Jujuy y Chaco s/n, Rincón de los Sauces, Neuquén, Argentina. lsfilippi@gmail.comRemains of ornithopod dinosaurs from the Upper Cretaceous of Argentina are abundant, allowing the description of several species. Over the last few years, the number of discoveries has increased significantly in the Rincón de los Sauces area (Neuquén province), where remains have appeared in two different formations (Plottier and Bajo de la Carpa formations). In this work, we present three new postcranial bones of an indeterminate ornithopod from La Escalonada site from Rincón de Los Sauces (Neuquén, Argentina). Those elements belong to Bajo de la Carpa Formation (Santonian) of the Neuquén Group and suppose the second record for this formation in Rincón de los Sauces. The recovered remains (MAU-Pv-LE-616 to 618) correspond to: a right pubis fragment, a dorsal vertebrae centrum and a right ungual pedal phalanx, respectively. The caudal vertebrae centrum is eroded and is exposed the sutures with the neural arch, which is lost. The pubis only retains part of the prepubic process and the iliac peduncle. The prepubic process is anteroposteriorly long, dorsoventrally narrow and the transversal section is triangular. The iliac peduncle is big and robust and is posteriorly directed. Its articular face is concave, quadrangular and is posteriorly directed. The right ungual pedal phalanx is of small size, slightly eroded, anteroposteriorly longer than lateromedially width and its articular surface is elliptical. The new bones represent a diversity rise of ornithopods, in an area which there was not record of ornithopod remains until 2015.