Aucasaurus

The type skeleton is complete to the thirteenth caudal vertebra, and so is relatively well understood, and was the most complete abelisaurid known when described in 2002. However, the skull is damaged, causing some paleontologists to speculate that it was involved in a fight prior to death. The holotype of Aucasaurus is known from finds in the Río Colorado Subgroup, a Late Cretaceous group comprising the Anacleto Formation in the Neuquén Basin of Argentina that has yielded many dinosaur fossils. Numerous sauropod eggs are also known from this deposit. The type specimen belongs to a mature individual of at least eleven years old. Aucasaurus was a medium-sized abelisaur, measuring 5.5–6.2 m (18–20 ft) long and weighing approximately 700 kg (1,500 lb). Its skull was not as short or as deep-snouted as that of Carnotaurus. Also, instead of horns, it had a pair of low ridges above each eye.