Odontobutis hikimius (Perciformes: Odontobutidae), a new host for Argulus coregoni (Crustacea: Branchiura: Argulidae)

島根県高津川水系匹見川の支流，石谷川で採集したイシドンコOdontobutis hikimiusの体表からチョウモドキArgulus coregoni Thorell, 1864の雌成体を得た。イシドンコはチョウモドキの新宿主である。また，チョウモドキはイシドンコから見出された最初の寄生虫である。
An adult female of the argulid branchiuran Argulus coregoni Thorell, 1864 was collected from the body surface of a recently described, rare odontobutid Odontobutis hikimius (called “ishidonko”) in the Ishitani River, a tributary of the Hikimi River within the Takatsu River system, Shimane Prefecture, Japan. This collection represents a new host record for A. coregoni. This branchiuran is the first species of parasite found from O. hikimius.