Taxonomic Notes on Polyp and Medusa of Sarsia nipponica Uchida (Hydrozoa : Corynidae) from the Type Locality in Japan

Abstract

Life cycle of Sarsia nipponica Uchida, 1927 was revealed through laboratory-culturing of specimens from the type locality, Shirahama, Wakayama Prefecture, .Japan. The morphology of its polyp, newly liberated medusa, and mature medusa was redescribed, stressing new character states observed in these developmental stages. The nematocyst complement and egg size of this species were described for the first time. The taxonomic evaluation of filiform tentacles, which were newly found in the present well-developed polyp, was particularly made.