Craspedacusta sowerbyi (freshwater jellyfish)

Japanese: マミズクラゲ(真水水母) - マミズクラゲ(英語表記)Craspedacusta sowerbyi
Craspedacusta sowerbyi (freshwater jellyfish)
A freshwater coelenterate (cnidaria) belonging to the family Anemonidae of the class Hydrozoa (illustration) (illustration). It is distributed in temperate zones such as Europe, North America, and China, and was first discovered in Japan in 1928 in an aquarium at a laboratory at the University of Tokyo. No further reports were released after that, but since 1946 it has been frequently found in ponds and water tanks in various locations from Hokkaido to Kyushu between August and October. The cap is hemispherical and up to 2 cm in diameter, and is colorless and transparent. The edge of the cap has 100 to 200 tentacles of various lengths, depending on the stage of growth.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:
ヒドロ虫綱ハナガサクラゲ科に属する淡水産の腔腸動物(刺胞動物)(イラスト)(イラスト)。ヨーロッパ,北アメリカ,中国などの温帯域に分布しており,日本では1928年に東京大学の研究室の水槽で初めて発見された。その後,報告がなかったが,46年以降は北海道から九州までの各地で8~10月に池や貯水槽などからしばしば見いだされるようになった。 傘は直径2cmくらいまでの半球状で,無色透明。傘の縁には100~200本の長さがさまざまな触手が並んでいるが,これは成長の程度によって異なる。

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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