…Currently, only a few species of Lepisosteus live in the rivers and lakes east of the Rocky Mountains in North America, as well as in Cuba. They are the genus Lepisosteus . They have a long snout and sharp teeth. … From [Acta-finned fish]…The teleosts are the most common fish today, accounting for more than 90% of all fish species. On the other hand, the primitive soft-finned fishes are extinct, with only a dozen or so sturgeon species remaining, and the holostei are extinct, with only the Amia and several Lepisosteus species remaining in North America. The Polypterids (polypterans) were once considered a group of soft-finned fishes, but are now often placed in a separate, independent subclass. … *Some of the terminology that mentions "Lepisosteus" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…現在では北米大陸のロッキー山脈より東の地域の河川や湖,およびキューバなどに数種が生息しているにすぎない。レピソステウス属Lepisosteusがそれである。吻(ふん)が長く,鋭い歯をもっている。… 【条鰭類】より…現在は真骨類が最も繁栄しており,種数では全魚類の90%以上に達している。一方,原始的な軟質類は十数種ほどのチョウザメ類を残し,また全骨類は北アメリカ大陸のアミアAmiaとレピゾステウスLepisosteus数種を残して絶滅した。ポリプテルスPolypterus類(多鰭類)は軟質類の一群とされたこともあったが,現在では別の独立した亜綱に入れられることが多い。… ※「Lepisosteus」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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