Overosaurus paradasorum, a new sauropod dinosaur from Rincón de los Sauces
Publicado por Leonardo Filippi en 14:21
Rodolfo
A. Coria, Leonardo S. Filippi, Luis M. Chiappe, Rodolfo García y Andrea B.
Arcucci
A new lithostrotian
sauropod, the small-sized Overosaurus paradasorum n. gen et sp. from the Anacleto Formation (Cam-panian, Late Cretaceous, Neuquén Group,
Patagonia, Argentina) is here described. The specimen (MAU-Pv-CO-439) consists of a fully articulated
vertebral series from the 10th cervical to the 20th caudal vertebra, the last
cervical ribs, several dorsal ribs in articulation with their respective
vertebrae, the complete right ilium and fragments of the left ilium. Overosaurus
paradasorum is diagnosed by a unique combination of
characters that includes (1) posterior cervical vertebrae with long pre- and
postzygapophyses that project beyond the anterior and posterior borders of the
centrum, respectively, (2) postspinal lamina absent in all dorsal neural
spines, (3) wide and massive 9th and 10th caudal centra that are slightly
exca-vated laterally and have relatively flat ventral surfaces, (4) laminar
projection on the posterior border of the second and third dorsal rib, (5)
ilium proportionally shorter anteroposteriorly and taller dorsoventrally than
in other lithostrotians, and (6) the preacetabular process of the ilium
strongly deflected laterally and with a ventrolaterally tapering end. Analysis
of the phylogenetic relationships of Overosaurus places it within the Aeolosaurini,
as the sister taxon of a monophyletic group formed by Aeolosaurus rionegrinus, A. maximus, Gondwanatitan faustoi and
Pitekunsaurus
macayai. Overosaurus is a
new representative of a highly diversified assemblage of Campanian
lithostrotians from Patagonia that includes both Aeolosaurini
and saltasaurids (e.g. Saltasaurus, Neuquensaurus) this small new taxon
falls within the low end of the size spectrum represented by these Late
Cretaceous sauropods.
Coria, R. A., Filippi, L. S., Chiappe, L. M., García, R.
& Arcucci, A. B. 2013. Overosaurus
paradasorum gen. et sp. nov., a new sauropod dinosaur (Titanosauria:
Lithostrotia) from the Late Cretaceous of Neuquén, Patagonia, Argentina. Zootaxa 3683 (4): 357-376.
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I had already made a syntethical description on my blog (http://dennonychus.blogspot.it/2013/07/new-taxon-overosaurus-paradasorum-coria.html) and I think that Overosaurus have some notable reversions, as lack of post-spinal laminae, the posture typical of a brachiosaur etc... What do you think?
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