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Piatnitzkysaurus
''Piatnitzkysaurus'' (pron.:"") is an extinct genus of megalosaurid theropod dinosaur that lived approximately 164 to 161 million years ago during the middle part of the Jurassic Period in what is now Argentina. It was named to honor Alejandro Mateievich Piatnitzky (1879–1959), a Russian-born Argentine geologist. ''Piatnitzkysaurus'' was a moderately large, lightly built, bipedal, ground-dwelling carnivore, that could grow up to long.
==Classification and description==
The holotype specimen of ''Piatnitzkysaurus'', PVL 4073, was collected during expeditions in 1977, 1982, 1983 at the Canadon Asfalto Formation in sediments that were deposited during the Callovian stages of the Jurassic period, approximately 164 to 161 million years ago. Once thought to be a basal carnosaur,〔Bonaparte, 1979. Dinosaurs: A Jurassic assemblage from Patagonia. Science. 205, 1377–1379.〕 it may instead be a megalosauroid.〔 In total two partial skeletons are known (a fractured skull and parts of two postcranial skeletons, among which paratype MACN CH 895) and show that ''Piatnitzkysaurus'' was a relatively lightly built medium-sized bipedal carnivore that was around long and around in mass, though such estimates apply to the holotype, which is a subadult.〔Mazzetta, G. V., Fariiia, R. A., & Vizcaino, S. F. 2000. On the palaeobiology of the South American homed theropod Carnotaurus sastrei Bonaparte. In: B. Perez-Moreno, T.R. Holtz Jr., J.L. Sanz, & J.J. Moratalla (eds.), Aspects of Theropod Paleobiology, Special Volume - Gaia 15, 185-192. Lisbon.〕 It had robust arms and powerful hind legs with four toes on each foot. Its ischium is long.〔Brusatte, S. L., Benson, R. B. J., and Xu, X. 2010. The evolution of large-bodied theropod dinosaurs during the Mesozoic in Asia. Journal of Iberian Geology, 36, 275-296〕 Its braincase resembles that of another megalosauroid, the megalosaurid ''Piveteausaurus'' from France.〔Rauhut, 2004. Braincase structure of the Middle Jurassic theropod dinosaur ''Piatnitzkysaurus''. Canadian Journal of Earth Science. 41, 1109–1122.〕 A general resemblance to the theropod ''Allosaurus'' was also noted by Benton (1992).〔Benton, M. (1992). Dinosaur and other prehistoric animal factfinder. 1st American ed. New York: Kingfisher Books. Chicago / Turabian - Author Date Citation〕
The type species, ''Piatnitzkysaurus floresi'', was described by Jose Bonaparte in 1979.
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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