A New Land-hopper Genus, Mizuhorchestia, from Japan (Crustacea, Amphipoda, Talitridae)

Mizuhorchestia urospina gen. et sp. nov. is described from terrestrial habitats in Japan. It is characterized by elongate antenna 1, 4-dentate left mandible, maxilliped palp article 2 lacking mediodistal lobe, strongly subchelate gnathopod 1 in both sexes, cuspidactylate pereopods, moder- ately reduced pleopods, and weakly armed outer ramus of uropod 1. These features distinguish the new genus from allied genera: Agilestia Friend, 1982, Orchestiella Friend, 1987, Paciforchestia Bousfield, 1982, Neorchestia Friend, 1987, and Waematau Duncan, 1994.