Humerus of a basal abelisauroid theropod from the Late Cretaceous of Patagonia

NOVAS, F.E; EZCURRA, M.; AGNOLÍN, F.

Revista del Museo Argentino de Ciencias Naturales

Año: 2006 vol. 8 p. 63 - 68

1514-5158

Here we describe a partial humerus of a medium-sized theropod dinosaur from the Upper Cretaceous Portezuelo Formation, Neuquén Province, Argentina.The humerus shares with Abelisauroidea and Elaphrosaurus and articular head proximally oriented, and deltopectoral crest strongly reduced. The bone is referred to Abelisauroidea on the basis of teh following derived features: proximal tuberocity on caudal surface of humerus shaft, and greater tubercle at level with the medial tuberosity. The gracile morphology of the humerus, as well as the poor development of its medial tuberosity, remeble more Masiakasaurus than the condition present in abelisaurids, in which the humerus is more robust and the medial tuberosity is prominent. Available information demonstrates that during deposition of the Portezuelo Formation large and bulky abelisaurids lived together with gracile and medium-sized abelisaurids.