Xenotarsosaurus Xenotarsosaurus is a genus of abelisaurid theropod dinosaur that lived during the Late Cretaceous of Argentina .Discovery In 1980 geologist Juan Carlos Sciutto discovered a rich fossil site six kilometres north of the Ocho Hermanos ranch in Chubut province . Among the fossils found there were some theropod remains. Later, a team led by Argentinian paleontologist José Fernando Bonaparte recovered some more theropod bones, possibly from the same individual. In 1986, Rubén Martínez , Olga Giménez , Jorge Rodríguez and Graciela Bochatey described the theropod fossils and coined the genus and species Xenotarsosaurus bonapartei for them. The generic name is derived from Greek xenos , "strange", tarsos , "tarsus", and sauros , "lizard", a reference to the exceptional build of the ankle. The specific name bonapartei honours Bonaparte. The type specimens were found in the Bajo Barreal Formation . In 1986 this formation was seen as Campanian ; today it is thought to date to the earlier Cenomanian–Turonian. The bones consist of two cotypes: UNPSJB PV 184, a series of two anterior dorsal vertebrae , and PVL 612, a right hind limb including the long femur , the tibia , fibula and astragalocalcaneum of the ankle. The exceptional complete fusion, without sutures , of the astragalus and calcaneum , forming an element that is again fused to the widened lower end of the tibia, occasioned the generic name. In 2010 Gregory S. Paul estimated its length at 6 meters , its weight at 750 kg. In 2016, its length was estimated to be. The same year Molina-Pérez & Larramendi gave a similar length of 5.4 meters and a weight of 430 kg. The remains show some similarities to Carnotaurus sastrei , causing the describers to assign Xenotarsosaurus to the Abelisauridae , which has remained a common determination. However, it has also been proposed that Xenotarsosaurus is a neoceratosaurian of uncertain affinities.
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