A TINY POLYP COLONY CONSISTING OF ONLY TWO ZOOIDS OF Turritopsis dohrnii (HYDROZOA, ANTHOMEDUSAE) PRODUCED A MEDUSA BUD IN THE LABORATORY CULTURE

A polyp colony consisting of only two zooids of Turritopsis dohrnii collected initially from Ischia Island, Italy in June 2015, firstly produced a medusa bud as an extraordinary case showing the minimum number of zooids in a colony. This polyp colony consisted of only one or two zooids during a total of five months in the laboratory culture conditions that described in Kubota and Niina (2016) before and after the present very rare case of medusa bud formation on November 25, 2016, after once rejuvenated from an immature medusa to a polyp on July 12, 2016