gracilis, Cyprinus (Leuciscus) Richardson [J.] 1836:120, Pl. 78 [Fauna Boreali-Americana Part 3; ref. 3731] Saskatchewan River at Carleton House [apparently town of Carleton], Saskatchewan, Canada. Holotype (unique): whereabouts unknown. Type catalog: Gilbert 1998:86 [ref. 23395]. As Leuciscus gracilis on plate. •Valid as Cyprinus gracilis Richardson 1836 -- (Lee et al. 1980:186 [ref. 22416], Robison & Buchanan 1988:186 [ref. 23393], Espinosa Pérez et al. 1993:20 [ref. 22290]). •Valid as Hybopsis gracilis (Richardson 1836) -- (Chereshnev 1996:600 [ref. 24659]). •Valid as Platygobio gracilis (Richardson 1836) -- (McAllister 1990:64 [ref. 14674], Page & Burr 1991:103 [ref. 18983], Etnier & Starnes 1993:253 [ref. 22809], Baxter & Stone 1995:104 [ref. 23374], Cross & Collins 1995:110 [ref. 23394], Simons & Mayden 1997:195 [ref. 24948], Gilbert 1998:86 [ref. 23395], Scott & Crossman 1998:484 [ref. 24570], Fuller et al. 1999:139 [ref. 25838], Ross et al. 2001:242 [ref. 25978], Nelson et al. 2004:77 [ref. 27807], Scharpf 2005:36 [ref. 28940] with subspecies, McPhail 2007:116 [ref. 31199], Page & Burr 2011:209 [ref. 31215], Page et al. 2013:77 [ref. 32708], Page et al. 2023:75 [ref. 40505]). Current status: Valid as Platygobio gracilis (Richardson 1836). Leuciscidae: Pogonichthyinae. Distribution: North America: U.S.A. and Canada. Habitat: freshwater.