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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Sifrhippus ： ウィキペディア英語版 Sifrhippus ''Sifrhippus'' is an extinct genus of equid containing the species ''S. sandrae'' and ''S. grangeri''. ''Sifrhippus'' is the oldest equid known from North America, and its fossils come from the earliest Eocene of the Bighorn Basin, Wyoming. A 2012 study found ''Arenahippus'' to be synonymous with ''Sifrhippus''. ==Description== ''Sifrhippus'' was a very small equid the size of a house cat, varying from , the size variance, according to one theory, depending on the warmth of the climate.〔 ''Sifrhippus sandrae'' is referred to in earlier literature as ''Hyracotherium sandrae'', but Froehlich, arguing that the traditional genus ''Hyracotherium'' was not monophyletic, reassigned many of its species to other genera, and re-using the old name "''Eohippus''", for one. Froehlich give ''H. sandrae'' the new generic name ''Sifrhippus'', derived from the Arabic ''صِفْر'' (''ṣifr''), "zero", and Greek ''ἵππος'' (''híppos''), "horse".〔 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「Sifrhippus」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.