A New Occurrence of the Medusa of the "intermedia" Form of Eutima japonica (Hydrozoa, Leptomedusae, Eirenidae) at Okinawa Island, Japan

Abstract

Eutima japonica Uchida was collected for the first time in the Nansei Islands and it belongs to the "intermedia" form of the species. One of the two mature female medusae collected in Tomari Port, Okinawa Island, was kept in the laboratory for about three weeks after collection, and no shift to any other form of E. japonica took place. Various body parts of this specimen were measured at three different stages of development, which are described together with photographs of the external morphology.