INVESTIGADORES
EZCURRA Martin Daniel
artículos
Título:
Orkoraptor burkei nov. gen. et sp., a large theropod from the Maastrichtian Pari Aike Formation, Southern Patagonia, Argentina
Autor/es:
NOVAS, F. E.; EZCURRA, M. D.; LECUONA, A.
Revista:
CRETACEOUS RESEARCH (PRINT)
Editorial:
ACADEMIC PRESS LTD-ELSEVIER SCIENCE LTD
Referencias:
Lugar: Amsterdam; Año: 2008 vol. 29
ISSN:
0195-6671
Resumen:
A new large theropod, Orkoraptor burkei nov. gen. et nov. sp., from the Upper Cretaceous (Maastrichtian) Pari Aike Formation of southernPatagonia is based on a postorbital, quadratojugal, coronoid?, several teeth, an atlantal intercentrum and neurapophysis, two caudal vertebrae,and the proximal half of tibia. This new theropod exhibits characteristics of maniraptorans (i.e., coelurosaurians more derived than tyrannosaurids)including an upturned rostral process of the postorbital, the caudoventral corner of which is widely concave. Furthermore, teeth withoutdenticles and carina in the mesial margin resemble the condition of the maniraptoran clades Compsognathidae and Deinonychosauria. Thenew Patagonian theropod differs from other coelurosaurians (Ornithomimosauria, Compsognathidae, Alvarezsauridae, Dromaeosauridae,Aves) in having caudal vertebrae with a single pair of small pleurocoels on each side, and in having a median depression flanked by two longitudinaland narrow furrows on each tooth. Orkoraptor represents one of the southernmost carnivorous dinosaurs yet found in South Americaand adds valuable information about the diversification of tetanuran theropods in Gondwana.