著者

久保田 信 北田 博一 菅野 和彦

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.72, pp.219-222, 2018-01-20

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Aberrant female and male medusae of Turritopsis rubra and T. sp. (most frequently those with three oral lips and three gonads, but with normal four radial canals) were found (c 13% incidence in female of both species, n = 107, 85) in November, 2016 from Iwaki City, Fukushima Prefecture, Japan. In both species, parasitic trematoda was found; in T. sp. maximally eight individuals/normal medusa and five ones/aberrant medusa. Moreover, in the same place in Fukushima Prefecture and in the other place in Ibaragi Prefecture aberrant Turritopsis rubra mature medusae without oral lips or with 1, 2, 3, 5 oral lips, were also found (18.3 %, n = 142 in Otsu harbour in Ibaragi Prefecture) in October, 2017