Jesogammarus (Jesogammarus) ikiensis sp. n., Ishida, Iki, Nagasaki Prefecture, Japan. Holotype, male, 13.1 mm, NSMT-Cr 24107 (A–K) and paratype, female, 10.4 mm, NSMT-Cr 24108 (L and M). A uropod 3, dorsal view B telson, dorsal view C–E pleonites 1–3, respectively, dorsal views F–H urosomites 1–3, respectively, dorsal views I–K epimeral plates 1–3, respectively, lateral views L peduncular articles 1–3, accessory flagellum, and flagellar articles 1–5 of antenna 1, medial view M peduncular articles 1–5 and flagellar articles 1–3 of antenna 2, medial view.