hyostomus, Nocomis Gilbert [C. H.] 1884:203 [Proceedings of the United States National Museum v. 7 (no. 423); ref. 1622] East fork of White River, near Bedford, Lawrence County, Indiana, U.S.A. Syntypes: CAS 58626 [ex IU 4798] (4), CAS-SU 888 (30), USNM 34980 (6). Type catalog: Böhlke 1953:34 [ref. 12291], Gilbert 1998:93-94 [ref. 23395]. •Synonym of Hybopsis aestivalis (Girard 1856) -- (Lee et al. 1980:180 [ref. 22416]). •Synonym of Hybopsis aestivalis (Girard 1856), but possibly valid subspecies or species -- (Robison & Buchanan 1988:182 [ref. 23393]). •Synonym of Extrarius aestivalis (Girard 1856), but a valid subspecies -- (Cross & Collins 1995:62 [ref. 23394]). •Synonym of Macrhybopsis aestivalis but a valid subspecies -- (Boschung & Mayden 2004:208 [ref. 27995]). •Valid as Macrhybopsis hyostoma (Gilbert 1884) -- (Gilbert 1998:94 [ref. 23395], Eisenhour 1999:969 [ref. 24184], Luttrell et al. 1999:981 [ref. 24185], Underwood et al. 2003:493 [ref. 27126], Nelson et al. 2004:73 [ref. 27807], Miller & Robison 2004:128 [ref. 27931], Scharpf 2005:24 [ref. 28940], Page & Burr 2011:211 [ref. 31215], Page et al. 2013:73 [ref. 32708], Gilbert et al. 2017:508 [ref. 35222], Echelle et al. 2018:547 [ref. 35765], Bagley et al. 2023:314 [ref. 41241], Page et al. 2023:72 [ref. 40505]). Current status: Valid as Macrhybopsis hyostoma (Gilbert 1884). Leuciscidae: Pogonichthyinae. Distribution: Eastern North America: Ohio River drainage and Mississippi River basin and west coast Gulf slope (southern-central U.S.A.). Habitat: freshwater.