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Huayangosaurus
''Huayangosaurus'' is a genus of stegosaurian dinosaur from the Middle Jurassic of China. The name derives from "Huayang" (華陽), an alternate name for Sichuan (the province where it was discovered), and "saurus", meaning "lizard". It lived during the Bathonian to Callovian stages, around 165 million years ago, some 20 million years before its famous relative, ''Stegosaurus'' appeared in North America. At only 4.5 metres long, it was also much smaller than its famous cousin. Found in the Lower Shaximiao Formation, ''Huayangosaurus'' shared the local Middle Jurassic landscape with the sauropods ''Shunosaurus'', ''Datousaurus'', ''Omeisaurus'' and ''Protognathosaurus'', the ornithopod ''Xiaosaurus'' and the carnivorous ''Gasosaurus''. It was found in Huayang in China.
==Description==
Like other stegosaurians, ''Huayangosaurus'' was a quadrupedal herbivore with a small skull and a spiked tail. Like its more famous relative, ''Stegosaurus'', ''Huayangosaurus'' bore the distinctive double row of plates that characterize all the stegosaurians. These plates rose vertically along its arched back. In ''Huayangosaurus'', the plates were more spike-like than in ''Stegosaurus''. Like ''Stegosaurus'', however, it bore two pairs of long spikes extending horizontally near the end of its tail.
''Huayangosaurus'' was one of the smallest known stegosaurians, at just 4.5 meters (15 feet) in length.
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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