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Tatisaurus
''Tatisaurus'' is a genus of ornithischian dinosaur from the Early Jurassic from the Lower Lufeng Formation in Yunnan Province in China. Little is known as the remains are fragmentary.
==Discovery and species==
In 1948 and 1949 Father Edgar Oehler, a catholic priest working for the Fu Jen Catholic University at Beijing, excavated fossils near the village of Da Di in Yunnan. Among them was a jaw bone of a herbivorous dinosaur. In 1965 David Jay Simmons named and described it as the type species ''Tatisaurus oehleri''. The generic name is derived from Da Di, then more usually spelled as "Ta Ti". The specific name honours Oehler.〔Simmons D.J. (1965), The non-therapsid reptiles of the Lufeng Basin, Yunnan, China. ''Field Geol'' 15; 1-93.〕 The holotype, FMNH CUP 2088, was found in the Zhangjiawa Beds of the Lufeng Formation, dating from the Sinemurian. It consists of a partial left mandible with teeth. The lower jaw bone fragment is, lacking the tip, six centimetres long. The teeth are eroded. It is the only specimen known of the species.
Simmons assigned ''Tatisaurus'' to the Hypsilophodontidae, though this group was seen by him as an evolutionary grade of "primitive" Ornithopoda, ancestral to several ornithischian groups; he felt that ''Tatisaurus'' 's affinities were with ''Scelidosaurus'' or the Ankylosauria. Later, in 1990, the specimen was reviewed by Dong Zhiming who noted it had similarities with ''Huayangosaurus'' and placed it in the same subfamily, the Huayangosaurinae, hence making it a stegosaurian.〔Z. Dong. (1990). "Stegosaurs of Asia". In: K. Carpenter and P. J. Currie (eds.), ''Dinosaur Systematics: Perspectives and Approaches'', Cambridge University Press, Cambridge pp. 255-268〕
Later still, in 1996, Spencer Lucas reclassified ''Tatisaurus'' as a member of the genus ''Scelidosaurus'', thus as a ''S. oehleri'', in order to use it for a biochron.〔Lucas S.G. (1996). The thyreophoran dinosaur ''Scelidosaurus'' from the Lower Jurassic Lufeng Formation, Yunnan, China. pp. 81-85, in Morales, M. (ed.), The Continental Jurassic. ''Museum of Northern Arizona Bulletin'' 60.〕 This has in 2007 been regarded by David B. Norman and colleagues as unfounded. They instead consider ''Tatisaurus'' to be a dubious basal thyreophoran, showing the thyreophorean synapomorphy of a ventrally deflected mesial end of the dentary. It would then be one of the oldest known Thyreophora.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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