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''Coryphodon'' (from Greek κορῦφὴ, "point", and ὀδοὺς, "tooth", meaning ''peaked tooth'', referring to "the development of the angles of the ridges into points (the molars ).")〔 citing 〕 is an extinct genus of mammal. ''Coryphodon'' was a pantodont, a member of the world's first group of large browsing mammals. It migrated across what is now northern North America, replacing ''Barylambda'', an earlier pantodont. It is regarded as the ancestor of the genus ''Hypercoryphodon'' of Mid Eocene Mongolia. ''Coryphodon'' is known from many specimens in North America and considerably fewer in Europe, Mongolia, and China. It is a small to medium-sized coryphodontid who differs from other members of the family in dental characteristics. ==Description== At about at shoulder height and in body length, ''Coryphodon'' was the biggest known mammal of its time. The creature was very slow, with long upper limbs and short lower limbs, which were needed to support its weight. ''Coryphodon'' does not seem to have been in need of much in the way of defences, however, since most known predators of the time seem to have been much smaller than ''Coryphodon''. ''Coryphodon'' had one of the smallest brain/body ratios of any mammal, living or extinct, possessing a brain weighing just and a body weight of around . Estimates of ''Coryphodon'' 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Coryphodon」の詳細全文を読む スポンサード リンク
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