2020 年 29 巻 p. 35-38
Six specimens of Thamneus rostratus Bovallius, 1887 (Amphipoda: Hyperiidea) including a shining with iridescent glitter mature female attaching under surface of the umbrella of a warm water medusa, Pelagia noctiluca (Forsskål, 1775) (Cnidaria: Scyphozoa) were found from a shore coast in Jogashima, southern end of the Miura peninsula, Pacific coast of central Japan. The morphological features of the present specimens were in close agreement with the descriptions of Thamneus rostratus (or as Euthamneus rostratus) in previous literatures. This hyperiid have widely distributed, known from records in tropical and temperate regions of the world’s oceans, but it is relatively uncommon. This finding represents the first record of T. rostratus from Japanese water.
