Obelia geniculata

Japanese: エダフトオベリア（英語表記）Obelia geniculata

A coelenterate (cnidaria) of the family Ophiopogonidae in the class Hydrozoa. It is widely distributed worldwide and is commonly found off the coast of Japan. It attaches to seaweed and other things in shallow waters. The hydrostalk is about 1-2 cm tall. The periderm under the stalk of the hydropod is thick. The hydropods are cup-shaped with rounded, smooth edges, and occur alternately on the left and right sides of the hydropod. The reproductive body is deep, urn-shaped, and occurs on the upper side of the stalk that bears the hydropod, with several found on each hydrostalk. Closely related species include O. dichotoma and O. plana , the former of which grows on rocks and other things in shallow waters from Hokkaido to central Honshu, forming colonies about 2 cm tall.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

ヒドロ虫綱ウミサカズキガヤ科の腔腸動物(刺胞動物)。世界中に広く分布し，日本沿岸にもふつうに見られる。浅海の海藻やその他の上に付着する。ヒドロ茎の高さは1～2cmほど。ヒドロ莢（きよう）の柄の下の囲皮は厚くなっている。ヒドロ莢はヒドロ茎の上に左右交互に生じ，コップ状で口縁はまるくて平滑。生殖体は深いつぼ状で，ヒドロ莢をつける柄の上脇部に生じ，一つのヒドロ茎に数個見られる。近縁種にはヤセオベリアO.dichotomaとヒラタオベリアO.planaがあり，前者は北海道から本州中部までの浅海の岩石その他に着生し，高さ2cmほどの群体をつくる。

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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