Studies on Monogenetic Trematodes. XXXIII. New Species of Gyrodactylus and a Key to the North American Species

Abstract
Five new species of Gyrodactylus are described: G. colemanensis from Salmo gairdneri Richardson, Coleman National Fish Hatchery, Anderson (Shasto Co.) and Navarro River (Mendocino Co.); G. crysoleucas from Notemigonous crysoleucas (Mitchill), Rooney Pond, 17 miles east of Sacramento (Sacramento Co.) (all) California; G. lacustris from Pimephales promelas Rafinesque, Cottonwood Lake, 2 miles north of Butte (McHenry Col), North Dakota; G. perforatus from Clevelandia ios (Jordan and Gilbert), Bodega Lagoon (Sonoma Co.); and G. variabilis from Notemigonus crysoleucas, Rooney Pond, 17 miles east of Sacramento (Sacramento Co.) (both) California. Gyrodactylus hoffmani Wellborn and Rogers, 1967, is recorded from Pimephales promelas, Cottonwood Lake, 2 miles north of Butte (McHenry Co.), North Dakota, Parasite-host and host-parasite lists, and a key to the North American species of Gyrodactylus are provided.

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