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''Chuandongocoelurus'' ( ) is a genus of carnivorous tetanuran theropod dinosaur from the Jurassic of China. The type species ''Chuandongocoelurus primitivus'' was first described and named by Chinese paleontologist He Xinlu in 1984. The generic name combines references to the Chuandong in Sichuan Province and the theropod genus ''Coelurus'', itself named after the Greek κοῖλος, ''koilos'', meaning "hollow" and οὐρά, ''oura'', meaning "tail". The specific name means "the primitive one" in Latin, a reference to the great age of the find.〔 ''Chuandongocoelurus'' was initially based on two partial skeletons. The holotype, a thighbone, is part of specimen CCG 20010. Vertebrae, pelvic bones and hindlimb elements, also catalogued under this inventory number, may belong to the same individual. The specimen has unfused neurocentral sutures in its vertebrae, meaning that the animal was immature at the time of death. The formation in which it was discovered was the Lower Shaximiao Formation, part of the Dashanpu Formation, meaning ''Chuandongocoelurus'' dates to the Bathonian or Callovian stage of the Middle Jurassic. A second specimen is CCG 20011, a set of neck vertebrae from a different and much larger individual.〔 In 2012, it was concluded that both specimens represent different taxa, probably not even closely related.〔M.T. Carrano, R.B.J. Benson, and S.D. Sampson, 2012, "The phylogeny of Tetanurae (Dinosauria: Theropoda)", ''Journal of Systematic Palaeontology'' 10(2): 211-300〕 The holotype thighbone has a length of 201 millimetres.〔 He placed ''Chuandongocoelurus'' in the Coeluridae,〔He, 1984. The vertebrate fossils of Sichuan. Sichuan Scientific and Technological Publishing House. 168 pp.〕 at the time a wastebasket taxon including almost all small theropods. David Bruce Norman in 1990 considered it to be an indeterminate theropod.〔Norman, David B. (1990). Problematic Theropoda: "Coelurosaurs". p. 280-305 ''in'' David B. Weishampel, et al. (eds.), ''The Dinosauria.'' University of California Press, Berkeley, Los Angeles, Oxford.〕 More recently, Roger Benson (2008, 2010) and Benson ''et alii'' (2010) found it to be the sister taxon of ''Monolophosaurus'', together forming a clade belonging either to Megalosauroidea〔Benson, 2008. A new theropod phylogeny focussing on basal tetanurans, and its implications for European 'megalosaurs' and Middle Jurassic dinosaur endemism. Journal of Vertebrate Paleontology. 51A〕 or outside of Megalosauroidea in the Tetanurae.〔Benson, Brusatte and Carrano, 2010. A new clade of large-bodied predatory dinosaurs (Theropoda: Allosauroidea) that survived to the latest Mesozoic. Naturwissenschaften. 97, 71-78〕 In 2012, Matthew Carrano e.a. found ''Chuandongocoelurus'' outside of the Megalosauria.〔 ==References== 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「Chuandongocoelurus」の詳細全文を読む スポンサード リンク
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