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Prorastomus
''Prorastomus sirenoides''〔The generic name ''Prorastomus'', a combination of Greek (''prōra''), prow, and (''stoma''), mouth, refers to the lower jaw of the animal "resembling the prow of a wherry" (Owen, 1855, p. 542).〕 is an extinct species of primitive sirenian that lived during the Eocene Epoch 40 million years ago in Jamaica. ==Description== While modern sirenians are fully aquatic, the ''Prorastomus'' was predominantly terrestrial, judging from the structure of its skull. Judging from its crown-shaped molars and the shape of its snout, it fed on soft plants.
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「Prorastomus」の詳細全文を読む
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