Horseshoe jellyfish - Kabuto jellyfish

Japanese: カブトクラゲ - かぶとくらげ

A ctenophore of the family Helmetidae of the class Tentacleata. It is named after the fact that both sides of the lower part of its body are swollen, giving it the shape of a helmet. It is widely distributed in warm seas. Larger specimens can reach a length of 10 cm. The body is gelatinous, with large wing-like projections on both sides of the lower part, each with a small ear-like projection at its base. Of the eight rows of comb plates, four are long and reach above the wing-like projections, while the other four are short. Because its body is soft, it breaks down when the sea is rough, so it sinks deep when the waves are rough and rises near the surface when the sea is calm.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

有触手綱カブトクラゲ科の有櫛（ゆうしつ）動物。体の下方の両側がふくらんで，全体がかぶと(兜)の形をしているのでこの名がある。暖海域に広く分布している。大きいものでは長さ10cmになる。体は寒天質で，下方両側に大きな翼状突起があり，それぞれの基部に耳状小突起がある。8本の櫛板列のうち，4本は長くて翼状突起の上まで達し，他の4本は短い。体が柔らかいために海がしけると体がくずれるので，波の高いときは深く沈み，穏やかになると海の表面近くにあがってくる。

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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