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Viavenator, new abelisaurid theropod from Upper Cretaceous of Argentina



Ben Creisler
bcreisler@gmail.com

A new paper.
Thanks to Rubén Darío Juárez Valieri for bringing this paper to my attention.


Leonardo S. Filippi, Ariel H. Méndez, Rubén D. Juárez Valieri &
Alberto C. Garrido (2016)
A new brachyrostran with hypertrophied axial structures reveals an
unexpected radiation of latest Cretaceous abelisaurids.
Cretaceous Research 61: 209–219
doi:10.1016/j.cretres.2015.12.018
http: // www.sciencedirect.com/science/article/pii/S0195667115301439?np=y

A well preserved skeleton of a new abelisaurid is reported here. The
holotype of Viavenator exxoni was found in the outcrops of the Bajo de
la Carpa Formation (Santonian, Upper Cretaceous), northwestern
Patagonia, Argentina. This new taxon belongs to the South American
clade of abelisaurids, the brachyrostrans. The current phylogenetic
analysis places it as the basalmost member of a new clade of derived
brachyrostrans, named Furileusauria, characterized by distinctive
cranial, axial and appendicular anatomical features. The Santonian age
of Viavenator allows filling the stratigraphic gap exhibited between
the basal brachyrostrans of Cenomanian–Turonian age, and the derived
forms from the Campanian-Maastrichtian. The evolution of abelisaurids
during the Late Cretaceous, faunal replacements, and the adaptive
radiation that occurred during that period of time in South America
are discussed.