Archaeohippus

Japanese: Archaeohippus
Archaeohippus

…However, the Mesohippus of the next Oligocene had three digits on both the front and back toes, and the rate of evolution accelerated toward the beginning of the next Miocene, with the first great radiation of the horse family. In other words, various species appeared, including the large Miohippus and Anchitherium , the again small Archaeohippus , the giant Hypohippus and Megahippus , and others. These had tooth structures that were suitable for folivorous (eating soft young leaves and buds), but Parahippus also appeared during this period, with tooth structures that were suitable for herbivorous (eating hard fibrous materials). …

*Some of the terminology that mentions "Archaeohippus" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…しかし,次の漸新世のメソヒップスMesohippusは前・後趾とも3指となり,次の中新世の初期にかけて,ウマ科の第1回の大放散が見られるなど進化速度ははやまった。つまり,大型化したミオヒップスMiohippusとアンキテリウムAnchitherium,再び小型化したアルカエオヒップスArchaeohippus,巨大なヒポヒップスHypohippusおよびメガヒップスMegahippusなどさまざまなものが現れたことである。これらは,葉食性(やわらかい若葉や芽などを食べる)の歯の構造をもっていたが,この時期には草食性(かたい繊維質のものを食べる)の歯の構造をもつパラヒップスParahippusも出現している。…

※「Archaeohippus」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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