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Tyrannotitan (carcharodontosaurid theropod, Cretaceous of Argentina) osteology and phylogeny



From: Ben Creisler
bcreisler@gmail.com


A new online paper:


Juan Ignacio Canale, Fernando Emilio Novas & Diego Pol  (2014)
Osteology and phylogenetic relationships of Tyrannotitan chubutensis
Novas, de Valais, Vickers-Rich and Rich, 2005 (Theropoda:
Carcharodontosauridae) from the Lower Cretaceous of Patagonia,
Argentina.
Historical Biology (advance online publication)
DOI:10.1080/08912963.2013.861830
http://www.tandfonline.com/doi/full/10.1080/08912963.2013.861830#.Us1zbPRDty8

The theropod clade Carcharodontosauridae is a broadly distributed
group of large allosauroid theropods. The carcharodontosaurids
recorded in the Albian–Cenomanian of Gondwana are the youngest and
most derived members of this clade. Tyrannotitan chubutensis, from the
Cerro Castaño Member of Cerro Barcino Formation (Albian; Chubut
Group), Central Patagonia, Argentina, is of prime interest among
Gondwanan carcharodontosaurids as it represents the oldest record of
the group. Here we offer a detailed osteological comparative
description of the holotype and paratype of Tyrannotitan chubutensis
together with a new diagnosis of the species. The new information
results in a better understanding of this taxon and
Carcharodontosauridae. Furthermore, a comparative study of the anatomy
of the pectoral girdle of Giganotosaurus is reinterpreted as very
similar to that of Tyrannotitan and Mapusaurus. We also present a
phylogenetic analysis of Carcharodontosauridae that recovers
Tyrannotitan as a derived carcharodontosaurid, being the sister group
of the clade formed by Giganotosaurus and Mapusaurus, all nested in
the clade Giganotosaurini.