A coelenterate of the family Portunidae in the order Tubuleinae of the class Hydrozoa (illustration). The fact that this is not a single jellyfish but a colony was revealed in the 1850s by research by TH Huxley and others. This jellyfish is also known as the "electric jellyfish" because its sting produces a powerful venom in the cnidocytes, causing blisters on the skin and a numbing pain when stung. It is distributed in tropical waters, and in Japan it causes harm to beachgoers from summer to autumn. At the top of its body, a cobalt-colored swim bladder (pneumatophora) about 10 cm long floats on the water surface, and many individual zoans with different forms and functions, such as tentacles, trophozoites, reproductive bodies, and antennae, gather from a short stem on the underside of the pneumatophora to form a colony. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
ヒドロ虫綱管水母目カツオノエボシ科の腔腸動物(イラスト)。これが単体のクラゲでなく群体であることは,T.H.ハクスリーらの研究により1850年代に明らかとなった。このクラゲは刺胞毒が強力で,刺されると皮膚が火膨れになり,しびれるように痛むところから〈電気クラゲ〉とも呼ばれる。熱帯水域に分布し,日本へは夏から秋にかけて海水浴客に害を与える。体の上端に長さ10cmくらいのコバルト色の浮袋(気胞体)が水面の上に浮かび,気胞体の下面の短い幹から触手,栄養体,生殖体,感触体など,それぞれ形態と機能が異なった多くの個虫が集まって群体をつくっている。
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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