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Istiodactylus
''Istiodactylus'' is a genus of a medium-sized pterosaurs from the early Cretaceous period. It contains two species: ''Istiodactylus latidens'', from southern Britain, and ''Istiodactylus sinensis'', from China. ''Istiodactylus'' were unusual compared with related pterosaurs, thanks to their distinctive broad muzzles and "cookie cutter" teeth.
==Description==
''Istiodactylus'' were moderately large pterosaurs. Correcting earlier estimates of a length of , a 2012 study concluded that the skull of one specimen, NHMUK R3877, was long.〔 The maximum wingspan was probably about ,〔 making the largest individuals roughly half the size of the largest ''Pteranodon''.
Because of the flat, rounded shape of their snouts, ''Istiodactylus'' are sometimes referred to as "duck-billed pterosaurs".〔Peter Wellnhofer, 1991, ''The Illustrated Encyclopedia of Pterosaurs'', Crescent Books, p. 114〕 However, unlike ducks, they had teeth. These triangular teeth were laterally compressed, an adaptation for slicing flesh, and interlocked tightly in the closed jaws. The skull was relatively short, with most teeth concentrated in the blunt front tip of the jaws. Witton's 2012 study proposed that ''Istiodactylus'' were primarily scavengers.〔Witton, M.P. (2012). "New Insights into the Skull of ''Istiodactylus latidens'' (Ornithocheiroidea, Pterodactyloidea)." ''PLoS ONE'', 7(3): e33170. 〕
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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