The Hydroid Stage of the Medusa Koellikerina bouilloni (Cnidaria, Hydrozoa)

抄録

The polyps of Koellikerina bouilloni Kawamura and Kubota, 2005 were discovered growing on the shell of the gastropod Nassarius festivus (Powys, 1835) collected from Isozaki, Hitachinaka, Ibaraki, Japan. This hydrozoan species was so far known only from the medusae collected in Tanabe Bay, Wakayama, Japan (type locality) and Papua New Guinea. The discovery of the polyp and the rearing of the medusae permitted us to complement the description of this species.