著者

久保田 信 西原 史晃

出版者

日本生物地理学会

雑誌

日本生物地理学会会報 = Bulletin of the Biogeographical Society of Japan (ISSN:00678716)

巻号頁・発行日

vol.71, pp.199-202, 2017-01-20

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Many (25 individuals) immature medusae of a large form of Turritopsis medusae were collected from Enoshima, Kanagawa Prefecture in April, 2016, and cultured in the laboratory for about two months until their death (rejuvenated from a medusa to stolon, but no formation of zooids). They grew well-grown (maximally 8 mm in umbrella height) medusae with scarlet-coloured manubrium and c 80-100 tentacles. The present occurrence of a large form, though not an adult, is the second southernmost distributional record of this species after one century. However, the number of tentacles of the present medusae showed the minimum number, in contrast to having much more tentacles in wild medusae collected from various places in Japan (from Kanagawa Prefecture to Hokkaido).