Species that contain: Prosopium and williamsoni [ 3 ] records

cismontanus, Coregonus williamsoni Jordan [D. S.] 1890:49, Pl. 9 (figs. 8-9) [Bulletin of the U. S. Fish Commission v. 9 [1889]; ref. 12341] Missouri River, U.S.A. Syntypes: CAS-SU 660 (5); USNM 38225 (1), 41622 (4). Type catalog: Böhlke 1953:14 [ref. 12291]. •Synonym of Prosopium williamsoni (Girard 1856) -- (Baxter & Stone 1995:187 [ref. 23374]). Current status: Synonym of Prosopium williamsoni (Girard 1856). Salmonidae: Coregoninae. Habitat: freshwater.

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.

williamsoni, Coregonus Girard [C. F.] 1856:136 [Proceedings of the Academy of Natural Sciences of Philadelphia v. 8; ref. 1809] Deschutes River, a tributary of Columbia River, Oregon, U.S.A. No types known. •Valid as Prosopium williamsoni (Girard 1856) -- (Lee et al. 1980:102 [ref. 22416], McAllister 1990:83 [ref. 14674], Page & Burr 1991:46 [ref. 18983], La Rivers 1994:325 [ref. 23389], Baxter & Stone 1995:186 [ref. 23374], Sigler & Sigler 1996:201 [ref. 25943], Thurow et al. 1997:1094 [ref. 25523], Scott & Crossman 1998:291 [ref. 24570], Fuller et al. 1999:255 [ref. 25838], Moyle 2002:243 [ref. 26449], Wydoski & Whitney 2003:87 [ref. 27816], Nelson et al. 2004:86 [ref. 27807], Scharpf 2006:32 [ref. 30386], McPhail 2007:392 [ref. 31199], Page & Burr 2011:393 [ref. 31215], Page et al. 2013:87 [ref. 32708], Page et al. 2023:83 [ref. 40505]). Current status: Valid as Prosopium williamsoni (Girard 1856). Salmonidae: Coregoninae. Distribution: Western North America. Habitat: freshwater.