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Yangchuanosaurus
''Yangchuanosaurus'' is an extinct genus of metriacanthosaurid theropod dinosaur that lived in China during the late Oxfordian (and possibly Kimmeridgian) stage of the Late Jurassic, and was similar in size and appearance to its North American contemporary, ''Allosaurus''. It hails from the Upper Shaximiao Formation and was the largest predator in a landscape which included the sauropods ''Mamenchisaurus'' and ''Omeisaurus'' as well as the Stegosaurs ''Chialingosaurus'', ''Tuojiangosaurus'' and ''Chungkingosaurus''. It got its name after its discovery site in Yongchuan, in China.
==Description==
The type specimen of ''Y. shangyouensis'' had a skull long, and its total body length was estimated at about . Another specimen, assigned to the new species ''Y. magnus'', was even larger, with a skull length of . It may have been up to long, and weighed as much as . There was a bony ridge on its nose and multiple hornlets and ridges, similar to ''Ceratosaurus''.
''Yangchuanosaurus'' was a large, powerful meat-eater. It walked on two large, muscular legs, had short arms, a strong, short neck, a big head with powerful jaws, and large, serrated teeth. It had a long, massive tail that was about half of its length. Its feet had three toes, each with a large claw. Its arms were short, and it had three clawed fingers on each hand.
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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