A marine animal belonging to the order Hydroids, class Hydrozoa, and family Anemonidae. The jellyfish's umbrella is dish-shaped or hemispherical, 1.5-2 cm in diameter, and the 40-100 tentacles found on the edge of the umbrella are bent near the tip, hence the name. There are four rays, and the gonads develop in folds along their entire length. The oral stalk is short. It usually swims among the waterweeds in shallow waters, but sometimes it attaches to the waterweed using sticky cells near the tip of the tentacles, or rests on the seabed with the umbrella facing down. The tentacles, oral stalk, and gonads are brown. It is distributed along the coasts of Japan and widely around the world. The northern jellyfish found off the coast of Hokkaido is considered to be a variant of this species, but it is somewhat small and has strong nematocyst venom. The polyp form is extremely small and degenerate, so small that it is usually not visible to the naked eye, but it has 4-6 tentacles and is single. In addition to producing medusa buds on their bodies, they asexually sprout small planulae which attach and become new polyps. [Mayumi Yamada] The cap is dish-shaped or hemispherical, with 40 to 100 tentacles on the edge of the cap. © Underwater Fort Enterprise, Isamu Soyama "> Keynote jellyfish (ecology) Source: Shogakukan Encyclopedia Nipponica About Encyclopedia Nipponica Information | Legend |
腔腸(こうちょう)動物門ヒドロ虫綱ヒドロイド目ハナガサクラゲ科に属する海産動物。クラゲの傘は皿状ないし半球状で直径1.5~2センチメートル、傘縁に40~100本みられる触手はその先端近くで折れ曲がっており、そのためにこの名がある。放射管は4本、その全長に沿って生殖腺(せん)がひだをつくって発達する。口柄は短い。普通、浅海のアジモの間などを泳いでいるが、ときどき触手の先端近くにある粘着細胞でアジモにくっついて静止するか、あるいはまた傘を下にして海底に休止する。触手、口柄、生殖腺は褐色。日本の各地沿岸のほか世界に広く分布する。北海道沿岸にみられるキタカギノテクラゲは本種の1変種とされるが、これは多少小形であり、また強い刺胞毒をもっている。ポリプ形はきわめて小形で退化したもので、普通肉眼では識別できないほどであるが、4~6本の触手をもち、単体である。その体上にクラゲ芽ができるほか、小さなプラヌラ様のものを無性的に芽出し、それは付着してまた新しいポリプとなる。 [山田真弓] 傘は皿状ないし半球状で、傘縁に40~100本の触手をもつ©水中フォート・エンタープライズ 楚山いさむ"> カギノテクラゲ(生態) 出典 小学館 日本大百科全書(ニッポニカ)日本大百科全書(ニッポニカ)について 情報 | 凡例 |
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