岐阜県馬瀬川産イワナに寄生していたチョウモドキ

An adult female of Argulus coregoni Thorell, 1864 was collected from the body surface of a white-spotted char, Salvelinus leucomaenis (Pallas, 1814), in the upper reaches of the Maze River, a tributary of the Hida River draining into the Nagara River, Gifu Prefecture, central Japan. This represents the first record of A. coregoni from a wild salmonid population in the prefecture, and the species is briefly described based on the female collected.