A class of Coelenterata (Cnidaria). Also called Scyphozoa or Eujellyfish. With very few exceptions, there are polyp-type and medusa-type generations, with the medusa-type being larger and more developed than the polyp-type. About 230 species are known from around the world, including the moon jellyfish, the red jellyfish (illustration), the Andon jellyfish, and the Octopus jellyfish. The umbrella is disc-shaped or hemispherical, and is made of a thick gelatinous gelatinous medium. The large Nomura's jellyfish can reach an umbrella diameter of over 1m and weigh up to 150kg. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
腔腸動物門(刺胞動物門)の一綱。鉢虫類,真正クラゲ類ともいう。ごく少数の例外を除いて,ポリプ型とクラゲ型の世代があり,クラゲ型がポリプ型よりも大きく発達している。ミズクラゲ,アカクラゲ(イラスト),アンドンクラゲ,タコクラゲなど世界から230種ほどが知られている。かさは円盤状や半球状で,厚いゼラチン質の中膠(ちゆうこう)からなり,エチゼンクラゲの大きなものではかさの直径1m以上,体重が150kgになるものもある。
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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