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Xenotarsosaurus is a little-understood genus of abelisaurid theropod that lived during the Late Cretaceous (Campanian and Maastrichtian). It was described by Martinez, Gimenez, Rodriguez and Bochatey in 1987.

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  • Xenotarsosaurus
  • Xenotarsosaurus
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  • Xenotarsosaurus is a little-understood genus of abelisaurid theropod that lived during the Late Cretaceous (Campanian and Maastrichtian). It was described by Martinez, Gimenez, Rodriguez and Bochatey in 1987.
  • 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.
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  • Xenotarsosaurus is a little-understood genus of abelisaurid theropod that lived during the Late Cretaceous (Campanian and Maastrichtian). It was described by Martinez, Gimenez, Rodriguez and Bochatey in 1987.
  • 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, Ricardo 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.[1] The type specimens (and only known fossils of Xenotarsosaurus) 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 611 millimetres (24.1 in) 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. 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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