Abstract

MACHADO, Elaine B.; CAMPOS, Diogenes de A.; CALVO, Jorge O.  and  KELLNER, Alexander W. A.. A new Abelisauroid from the Upper Cretaceous of Brazil. Rev. mex. cienc. geol [online]. 2013, vol.30, n.2, pp.446-452. ISSN 2007-2902.

Although important dinosaur specimens have been recently described from Brazil, the theropod record in this county is still rather scarce, particularly from Cretaceous strata. Here we describe a complete right tibia (MCT 1783-R) from the Marilia Formation (Maastrichtian, Bauru Basin) near Peiropolis (Uberaba, Minas Gerais). This is the best theropod specimen recovered from this unit after five decades of collecting. MCT 1783-R shows a well developed cnemial crest with a lobular distal end, that projects significantly above the proximal articular surface, features that are characteristic of the Abelisauroidea. It further shows unique characters such as a marked asymmetry of lateral and medial condyles in posterior view, and a very deep triangular articular face for the astragalus, suggesting that it represents a new taxon.

Keywords : tibia; theropod; Abelisauroidea; Cretaceous; Bauru Basin; Brazil.

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