|Restoration of Carnotaurus sastrei.|
Carnotaurus was a predatory dinosaur that lived 70 million years ago. It was a large theropod which lived in South America during the Upper Cretaceous between about 72 and 70 million years ago. Although there is only one well-preserved skeleton, it is one of the best-understood theropods from the southern hemisphere.
The skeleton, found in 1984, was uncovered in the Chubut Province of Argentina. The name Carnotaurus means "meat-eating bull", from its bull-like horns. Carnotaurus is a derived member of the Abelisauridae, a group of large theropods that occupied the large predatorial niche in the southern landmasses of Gondwana in the later Cretaceous.
Carnotaurus was a lightly built, bipedal predator, 8 to 9 m (26 to 30 ft) in length and at least 1 metric ton (0.98 long ton; 1.1 short tons) in weight. As a theropod, Carnotaurus was highly specialized and distinctive. It had thick horns above the eyes, a feature not seen in other carnivorous dinosaurs, and a very deep skull sitting on a muscular neck. Also, it had small, vestigial forelimbs and long and slender hindlimbs.
The remains include skin impressions showing a mosaic of small, non-overlapping scales about 5 mm in diameter. The mosaic was interrupted by large bumps that lined the sides of the animal, and there are no hints of feathers.
The distinctive horns and muscular neck may have been used in fighting rivals of its own species. Rivals may have fought with quick head blows, by slow pushes with the upper sides of their skulls, or by ramming each other head-on, using their horns as shock absorbers. The feeding habits of Carnotaurus remain unclear: some studies suggest the animal was able to hunt down very large prey such as sauropods, while other studies find it preyed mainly on relatively small animals. Carnotaurus was well adapted for running and was possibly one of the fastest large theropods.
Palaeoecology[change | change source]
The animal lived in an environment of estuaries, tidal flats or coastal plains. The climate would have been seasonal with both dry and humid periods. The most common vertebrates collected include lungfish, turtles, crocodiles, plesiosaurs, dinosaurs, lizards, snakes and mammals.o2000"/> Turtles are represented by at least five taxa. In 2011, the discovery of a new enantiornithine bird from the La Colonia Formation was announced.
Media[change | change source]
It appears in the movie Dinosaur (2000), when two Carnotaurus were fighting with Iguanodon, Pachyrhinosaurus and other species.
References[change | change source]
- Carrano, Matthew T. & Sampson, Scott D. 2008. The phylogeny of Ceratosauria (Dinosauria: Theropoda). Journal of Systematic Palaeontology 6 (2): 183–236. 
- Bonaparte, José F. et al 1990. Carnotaurus sastrei Bonaparte, the horned, lightly built carnosaur from the Middle Cretaceous of Patagonia. Contributions in Science (Natural History Museum of Los Angeles County) 416. 
- Pascual, Rosendo et al 2000. A highly derived docodont from the Patagonian late Cretaceous: evolutionary implications for Gondwanan mammals. Geodiversitas 22 (3): 395, 399–400.
- Lawver, Daniel R. et al 2011. A new enantiornithine bird from the Upper Cretaceous La Colonia Formation of Patagonia, Argentina. Annals of Carnegie Museum 80 (1): 35–42.