…The origin of the proboscideans dates back more than 60 million years to the Late Cretaceous and Paleocene primitive ungulates, the Ophiopods. However, the oldest known fossil is the Moeritherium , from the Late Eocene, 40 million years ago. The animal was first found as a fossil in the Fayum region of Egypt, and was named after Lake Meri, the ancient name of a lake in the area. From [Proboscidea]… There are six families. The most primitive is the Moeritherium , found in the Eocene to Oligocene of Africa, which has three pairs of incisors on the top and two pairs on the bottom, as well as canines on the upper jaw, is the size of a tapir, has short limbs and a snout, and has a skeleton similar to that of a mangrove. The Deinotherium , known from the Miocene to Pleistocene of Africa and Eurasia, has only one pair of incisors on the lower jaw, pointing downward and backward. … *Some of the terminology explanations that mention "Moeritherium" are listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…長鼻類の起源は6000万年前より古く,白亜紀末ないし暁新世の原始的な有蹄類である髁節(かせつ)類に求められる。しかし,化石で知られる最古のものは,始新世後期,4000万年前のメリテリウムMoeritheriumである。化石としてエジプトのファユームで最初に発見されたこの動物には,その地域の湖の古名であるメリ湖の名がつけられた。… 【長鼻類】より… 次の6科がある。もっとも原始的なのはアフリカの始新世~漸新世のメリテリウム科(メリテリウムMoeritherium)で切歯が上に3対,下に2対,上あごに犬歯があり,バク大で四肢と鼻が短く,骨格はカイギュウ目に近い。アフリカ,ユーラシアの中新世~更新世から知られるデイノテリウム科(デイノテリウムDeinotherium)は切歯が下あごにだけ1対あり,下後方に向かう。… ※「Moeritherium」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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