Also written as hikaririn-gyo. A general term for fish belonging to the soft-finned or holostei of the Actinopterygii subclass of the Osteichthyes, whose bodies are covered with hard, diamond-shaped scales. The surface of the scales is a hard, shiny, enamel-like ganoine layer, with a spongy dentin underneath and a boney substrate. Scaled fish appeared in the Silurian Period of the Paleozoic Era and flourished in the Mesozoic Era, but their numbers suddenly decreased in the Tertiary Period of the late Cenozoic Era. Currently, only a few species live in rivers and lakes east of the Rocky Mountains in North America, as well as in Cuba. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
光鱗魚とも書く。硬骨魚綱の条鰭(じようき)亜綱の軟質類や全骨類に属する魚で,体が硬い菱形のうろこで覆われているものの総称。うろこの表面は硬いエナメル様のガノイン層で,つやがあり,その下に海綿状の歯質があり,基板は骨質でできている。硬鱗魚は古生代のシルル紀に出現し,中生代に繁栄したが,新生代後半の第三紀に入って急に減少した。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。
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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