タマクラゲの1種(刺胞動物門, ヒドロ虫綱, 花クラゲ目)の不完全な若返り

Abstract

A hydropolyp of Cytaeis sp. (Cnidaria, Hydrozoa, Anthomedusae) was collected from the sand grain in the tank. Over 12392 young medusae had separated from colonies of hydropolyp for 173 days. One degenerated manubrium was collected on the bottom of the Cytaeis jellyfish breeding beaker. On the 27th day after culure this manubrium clung to the petri dish. On the 29th day two hydrorhizas began to grow and on the 31st day one zooid-like bud was formed on the hydrorhiza. However, even on the 154th day there were no mouth and no tentacles on it. Thus, it was an attempted, incomplete rejuvenation.