…The structure of the third premolar of the lower jaw is distinctive in both species, and when viewed from the biting surface, the tooth has deep incisions on both the inside and outside, forming a 'Ro' shape, unlike the 'K' shape of the Leporinae. The Amami rabbit and the Japanese red rabbit are thought to have branched off from Pliopentalagus , which lived in Eurasia in the late Pliocene, and Pliopentalagus originated from Alilepus , which flourished in Eurasia and North America from the late Miocene to the early Pleistocene. At the same time, another important descendant of Alilepus, Nekrolagus , arose in North America, and this is the ancestor of the currently flourishing Leporinae. … *Some of the terminology that mentions "Alilepus" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…いずれも下あごの第3前臼歯(ぜんきゆうし)の構造に著しい特徴がみられ,その歯を咬面(こうめん)から見ると内側と外側から深い切れ込みがあり〈呂〉の字形を呈し,〈コ〉の字形のウサギ亜科のものと異なる。 アマミノクロウサギとアカウサギは鮮新世の後期にユーラシアにいたプリオペンタラグスPliopentalagusから分岐したとされ,プリオペンタラグスは中新世後期から洪積世前期までユーラシアと北アメリカで栄えたアリレプスAlilepusから生じている。同じころ,このアリレプスからもう一つ重要な子孫のネクロラグスNekrolagusが北アメリカで生じているが,これが現在繁栄しているウサギ亜科のものの祖先である。… ※「Alilepus」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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