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''Xenotarsosaurus'' is a genus of abelisaurid theropod dinosaur that lived during the Late Cretaceous of Argentina. 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.〔R.D. Martínez, O. Giménez, J. Rodríguez & G. Bochatey, 1986, "''Xenotarsosaurus bonapartei'' nov. gen. et sp. (Carnosauria, Abelisauridae), un nuevo Theropoda de la Formacion Bajo Barreal, Chubut, Argentina", ''IV Congreso Argentino de Paleontologia y Bioestratigrafia'' 1: 23-31〕 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 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.〔R.A. Coria and J. Rodríguez, 1993, "Sobre ''Xenotarsosaurus bonapartei'' Martínez, Giménez, Rodríguez y Bochatey, 1986; un problematico Neoceratosauria (Novas, 1989) del Cretácico de Chubut", ''Ameghiniana'' 30(3): 326-327〕 ==See also== * Timeline of ceratosaur research 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Xenotarsosaurus」の詳細全文を読む スポンサード リンク
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