わが国で初めて確認されたOctophialucium sp.(ヒドロ虫綱, 軟クラゲ目)の生活環

Abstract

ホシヤスジクラゲ(新称) Octophialucium sp. (ヒドロ虫綱, 軟クラゲ目)の複数の成熟クラゲを長崎県佐世保市沿岸ーから2010年3～ 4月に採取し, 写真撮影し, 形態を記載した. 水族館で, これらのクラゲの繁殖を試み, 得られたポリプ, クラゲ芽, 遊離直後のクラゲ, 成熟クラゲの形態を観察すると共に, 3ヶ月間の生活環を調査しその成長を明らかにした.

Ten or more medusae of Octophialucium sp. (Hydrozoa, Leptomedsae) were collected at the sea surface in Sasebo, Nagasaki Prefecture, Japan, as the first record from Japan. The morphology of four large mature medusae are described and photographed. They were reared in aquarium, and their polyps, medusa bud, newly liberated medusa and mature medusa were also described and photographed. The young medusae were reared for 3 months to observe the temporal morphological change in aquarium. The life cycle of this species is completed in aquarium for the first time.