The Notoungulata is a group of extinct ungulates that thrived in South America during the Oligocene and Miocene periods of the Tertiary Period. It is known that predecessors of this species also existed in Asia and North America in the early Tertiary Period, but they later evolved independently in isolation in South America. The name is derived from the Greek word notos, which means southern wind or southern region, and the Latin ungula, which means one with hooves. They had a distinctive ear bone structure, and ranged in size from mouse-sized to elephant-sized, but the shape of their molars is similar to that of mice. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
哺乳動物の分類群(目)Notoungulataで,第三紀の漸新世と中新世に南アメリカで繁栄していた絶滅有蹄類の1グループ。それより古い第三紀初期には,先祖型と思われるものがアジアや北アメリカにもいたことが知られるが,その後,南アメリカ大陸に孤立して独自の進化をとげた。ギリシア語で南の風または南の地域をさすnotosと蹄をもつものという意味のラテン語ungulaとから名づけられた。耳の骨の構造に特徴があり,ネズミ大からゾウ大までさまざまのものがいたが,臼歯の形態はネズミに似ている。
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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