argentissimus, Plagopterus Cope [E. D.] 1874:130 [2] [Proceedings of the American Philosophical Society v. 14; ref. 932] "San Luis Valley, western Colorado, U.S.A." [probably southwestern Utah, U.S.A.]. Syntypes: ANSP 19851-52 (2), BMNH 1883.12.14.239 [ex. USNM 15576] (1); MCZ 18817 (2), CAS-SU 2003 (1), USNM 15576 (3). Type catalog: Böhlke 1953:36 [ref. 12291], Böhlke 1984:69 [ref. 13621], Gilbert 1998:43 [ref. 23395]. On p. 2 of separate. Miller & Hubbs 1960:34 [ref. 11934] discuss types and type locality problems. Jordan & Evermann 1896:329 [ref. 2443] listed the type as USNM 15776, but that lot contains 3 specimens. •Valid as Plagopterus argentissimus Cope 1874 -- (Lee et al. 1980:344 [ref. 22416], Page & Burr 1991:83 [ref. 18983], Swift et al. 1993:117 [ref. 22379], La Rivers 1994:475 [ref. 23389], Williams 1995:400 [ref. 22136], Sigler & Sigler 1996:107 [ref. 25943], Gilbert 1998:43 [ref. 23395], Fuller et al. 1999:138 [ref. 25838], Nelson et al. 2004:77 [ref. 27807], Scharpf 2005:36 [ref. 28940], Miller 2006:138 [ref. 28615], Minckley & Marsh 2009:158 [ref. 31114], Page & Burr 2011:181 [ref. 31215], Page et al. 2013:77 [ref. 32708], Page et al. 2023:75 [ref. 40505]). Current status: Valid as Plagopterus argentissimus Cope 1874. Leuciscidae: Plagopterinae. Distribution: Western North America: Middle and lower Colorado River system (southwestern U.S.A. and northwestern Mexico). Habitat: freshwater.