Aberrant medusae of Turritopsis rubra and T.sp. (Hydrozoa, Anthomedusae) from Fukushima and lbaragi Prefectures, Japan where affected by radioactivity

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放射能の影響下にある福島県いわき市で2016年11月に同時採集したベニクラゲとニホンベニクラゲの成熟クラゲの雌雄において, 放射管は4本で正常だが口唇や生殖巣が三つの奇形などが出現した(2種の雌で各々約13%の奇形率, n= 107, 85). 2種とも吸虫類の寄生があり, ニホンベニクラゲの正常個体に最多で8個体. 奇形個体には5個体が見られた. 加えて, 福島県の同地点と茨城県の別地点で2017年10月に採集したベニクラゲの成熟クラゲで, 口唇が無いもの, 一つ, 二つ, 三つ. 五つ持つ個体等の奇形個体が出現したので(茨城県大津港で18.3%の奇形率, n= 142), それらの形態も記載した