Otohime no Hanagasa (Otohime's Flower Umbrella) - Otohime no Hanagasa (English name) Branchiocerianthus imperator

Japanese: オトヒメノハナガサ(乙姫の花傘) - オトヒメノハナガサ(英語表記)Branchiocerianthus imperator
Otohime no Hanagasa (Otohime's Flower Umbrella) - Otohime no Hanagasa (English name) Branchiocerianthus imperator
A coelenterate (cnidarian) belonging to the family Hydraidae of the class Hydrozoa, it is the largest polyp in the world (illustration). It has been found at depths of about 1,000 to 2,000 meters in the Gulf of Alaska, the Gulf of Panama, off the coast of East Africa, Sagami Bay, and other places. It produces hydroflowers with a diameter of about 20 cm on a slender stalk that can reach a height of up to 1.5 meters. However, the stalk is not attached to the center of the hydroflower, but to the edge, so the hydroflower is tilted at an angle of about 45 degrees to the stalk. The lower part of the stalk is slightly swollen with thin, whisker-like projections that stick into the mud.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:
ヒドロ虫綱オオウミヒドラ科に属する腔腸動物(刺胞動物)で,世界最大のポリプ(イラスト)。アラスカ湾,パナマ湾,東アフリカ沖,相模湾などの水深約1000~2000mから得られている。高さ1.5mにもなる細長い柄の上に直径約20cmのヒドロ花をつける。ただし,柄はヒドロ花の中央に付着せず,端のほうに付着するため,ヒドロ花は柄に対して45度くらい傾いている。柄の下部は少し膨らんでひげのような細い突起が生えていて,泥の中につきささっている。

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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