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''Protohippus'' is an extinct three-toed genus of horse. It was roughly the size of a modern donkey. Fossil evidence suggests that it lived during the Late Miocene and Early Pliocene, from about 14 Ma to 6 Ma.〔http://ufdc.ufl.edu/UF00099410/〕 Analysis of Protohippus' skull and teeth suggests that it is most closely related to the genus ''Calippus''.〔http://ufdc.ufl.edu/UF00099410/〕 Species include: * P. vetus * P. perditus * P. supremus (also P. simus) * P. gidleyi ==References== 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「Protohippus」の詳細全文を読む スポンサード リンク
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