Overosaurus
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Overosaurus Temporal range: Late Cretaceous, Campanian |
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| Overosaurus life restoration. | |
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Reptilia |
| Clade: | Dinosauria |
| Order: | Saurischia |
| Suborder: | †Sauropodomorpha |
| Clade: | †Neosauropoda |
| Clade: | †Macronaria |
| Clade: | †Titanosauria |
| Tribe: | †Aeolosaurini |
| Genus: |
†Overosaurus Coria et al., 2013 |
| Type species | |
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†Overosaurus paradasorum Coria et al., 2013 |
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Overosaurus is an extinct genus of sauropod dinosaurs, containing only a single species, Overosaurus paradasorum. This species lived approximately 84 to 78 million years ago during the latter part of the Cretaceous Period in what is now Patagonia (in southern Argentina). Overosaurus paradasorum was relatively small compared with other sauropods from Patagonia, like the saltasaurids and other aeolosaurines. It was a ground-dwelling herbivore, that could grow up to 8.6 m (28.2 ft) long.
Overosaurus was first described and named by Rodolfo A. Coria, Leonardo S. Filippi, Luis M. Chiappe, Rodolfo García and Andrea B. Arcucci in 2013. This species is known solely from the holotype MAU-Pv-CO-439 which consists of a fully articulated vertebral series from the 10th cervical to the 20th caudal vertebra, the ribs of the last three cervical vertebrae, six right dorsal ribs (articulated with their respective dorsal vertebrae 2,3,4,5,8,9), five left dorsal ribs (articulated with their respective dorsal vertebrae 2,3,4,5,8), the proximal portions of dorsal ribs of both sides of dorsal vertebrae 9 and 10, a complete right ilium and a fragmented left ilium. Specifically the vertebral series includes the last four cervical vertebrae, ten dorsal vertebrae, six sacral vertebrae, and twenty caudal vertebrae. Its sacrum consists of six fused sacral vertebrae.
Overosaurus was differentiated from other titanosaur taxa using a unique combination of characters present in the illium and in the cervical, dorsal and caudal vertebrae. A phylogenetic analysis of Lithostrotia placed Overosaurus within the Aeolosaurini, as the sister taxon of a monophyletic group formed by Gondwanatitan faustoi, Pitekunsaurus macayai, Aeolosaurus rionegrinus, and Aeolosaurus maximus.
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