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Metriacanthosaurus
''Metriacanthosaurus'' (meaning "moderately-spined lizard") is a genus of metriacanthosaurid dinosaur from the upper Oxford Clay of England, dating to the mid-Jurassic Period, about 160 million years ago (lower Oxfordian).
==History of discovery==
In 1923, German paleontologist Friedrich von Huene wrote a paper on Jurassic and Cretaceous European carnivorous dinosaurs. In this paper, he examined a specimen, OUM J.12144, including an incomplete hip, a leg bone, and part of a backbone, assigning it to a new species of ''Megalosaurus'': ''Megalosaurus parkeri''. The specific name honours W. Parker who in the nineteenth century had collected the fossils near Jordan's Cliff at Weymouth. These bones were from the Oxford Clay Formation, which is from the Upper Jurassic.〔
In 1932, however, von Huene concluded it was species of ''Altispinax'', '' A. parkeri''.
In 1964, scientist Alick Walker decided these fossils were too different from ''Altispinax'', as it lacked the long vertebral spines, and named a new genus, ''Metriacanthosaurus''. The generic name is derived from Greek ''metrikos'', "moderate", and ''akantha'', "spine". ''Metriacanthosaurus'' thus gets its name from its vertebrae, which are taller than typical carnosaurs, like ''Allosaurus'', but lower than other high-spined dinosaurs like ''Acrocanthosaurus''.
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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