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Abelisauroid theropod from Brazil (free pdf)



From: Ben Creisler
bcreisler@gmail.com

A new online paper for the open-access journal Revista Mexicana de
Ciencias Geológicas. The theropod may be a new taxon but is unnamed in
the paper.

Elaine B. Machado, Diogenes de A. Campos, Jorge O. Calvo & Alexander
W. A. Kellner (2013)
A new Abelisauroid from the Upper Cretaceous of Brazil.
Revista Mexicana de Ciencias Geológicas (advance online publication)
http://satori.geociencias.unam.mx/en_prensa/Machado-PRENSA.pdf



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 Marília Formation
(Maastrichtian, Bauru Basin) near Peirópolis (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.