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Kelmayisaurus a carcharodontosaurid

From: Ben Creisler

New at online Acta Palaeontologica Polonica:
Stephen L. Brusatte, Roger B. J. Benson, and Xing Xu (2011)
A reassessment of Kelmayisaurus petrolicus, a large theropod dinosaur from
the Early Cretaceous of China.
Acta Palaeontologica Polonica in press
available online 28 Apr 2011 doi:10.4202/app.2010.0125


The Early Cretaceous fossil record of large-bodied theropods from Asia is
poor, hindering comparison of Asian predatory dinosaur faunas with those
from other continents. One of the few large Asian theropod specimens from
this interval is a partial skull (maxilla and dentary) from the Lianmugin
Formation (?Valanginian-Albian), the holotype of Kelmayisaurus petrolicus.
Most authors have either considered this specimen as an indeterminate basal
tetanuran or a nomen dubium. We redescribe K. petrolicus and note that it
possesses a single autapomorphy (a deep accessory groove on the lateral
surface of the anterior dentary), as well as a unique combination of
characters that differentiates it from other theropods, affirming its
validity. A phylogenetic analysis recovers K. petrolicus as a basal
carcharodontosaurid, which is supported by various features: very deep
interdental plates (a carcharodontosaurid synapomorphy), fused interdental
plates (present in carchardontosaurids and a limited number of other
theropods), and the absence of diagnostic features of other clades of
large-bodied theropods such as abelisaurids, megalosauroids, and
coelurosaurs. As such, Kelmayisaurus is the second known
carcharodontosaurid from Asia, and further evidence that this clade
represented a global radiation of large-bodied predators during the
Early-mid Cretaceous. 

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