…The evolutionary process from Hyracotherium to modern horses has been revealed from the wide variety of fossil horses found in North America, but it is not as simple as previously thought. Orohippus and Epihippus , which followed Hyracotherium from the middle to late Eocene, are slightly larger than Hyracotherium, but they also have four toes in the front and three in the back. … *Some of the terminology explanations that mention "epihippus" are listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…ヒラコテリウムから現在のウマに至る進化の過程は,北アメリカで発見された多種多様の化石ウマから明らかにされてきたが,以前に考えられていたように単純なものではない。始新世中後期のものは,ヒラコテリウムに続くオロヒップスOrohippusとエピヒップスEpihippusである。ヒラコテリウムよりやや大型であるが,前趾(ぜんし)は4指,後趾は3指であることは同様である。… ※「エピヒップス」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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