oregonius, Coregonus Jordan [D. S.] & Snyder [J. O.] 1909:425, Fig. [Proceedings of the United States National Museum v. 36 (no. 1677); ref. 10658] McKenzie River, Oregon, U.S.A. Holotype: USNM 62987. Paratypes and additional material: CAS-SU 13117 (1), 21140 (4), 23204 (4); USNM 67005 (2), 75595 (1). Type catalog: Böhlke 1953:13 [ref. 12291]. •Synonym of Prosopium williamsoni (Girard 1856) -- (Lee et al. 1980:101 [ref. 22416], Sigler & Sigler 1996:201 [ref. 25943], Scott & Crossman 1998:294 [ref. 24570]). Current status: Synonym of Prosopium williamsoni (Girard 1856). Salmonidae: Coregoninae. Habitat: freshwater.