aestivalis, Gobio Girard [C. F.] 1856:189 [25] [Proceedings of the Academy of Natural Sciences of Philadelphia v. 8; ref. 1810] Río San Juan near Cadereita [Cadereyta], Nuevo León, Mexico. Holotype: USNM 79 (lost). Type catalog: Gilbert 1998:35 [ref. 23395]. On p. 25 of separate. •Valid as Hybopsis aestivalis (Girard 1856) -- (Lee et al. 1980:180 [ref. 22416], Robison & Buchanan 1988:181 [ref. 23393]). •Valid as Extrarius aestivalis (Girard 1856) -- (Page & Burr 1991:106 [ref. 18983], Cross & Collins 1995:62 [ref. 23394]). •Valid as Macrhybopsis aestivalis (Girard 1856) -- (Boschung 1992:52 [ref. 23239], Espinosa Pérez et al. 1993:17 [ref. 22290], Etnier & Starnes 1993:192 [ref. 22809], Knight & Hastings 1994:149 [ref. 25560], Stauffer et al. 1995:102 [ref. 23376], Mettee et al. 1996:219 [ref. 25836], Gilbert 1998:35 [ref. 23395], Eisenhour 1999:969 [ref. 24184], Lyons et al. 2000:24 [ref. 26594], Ross et al. 2001:177 [ref. 25978], Underwood et al. 2003:493 [ref. 27126], Nelson et al. 2004:72 [ref. 27807], Eisenhour 2004:13 [ref. 29854], Scharpf 2005:23 [ref. 28940], Miller 2006:130 [ref. 28615], Page & Burr 2011:212 [ref. 31215], Page et al. 2013:73 [ref. 32708], Gilbert et al. 2017:501 [ref. 35222], Echelle et al. 2018:546 [ref. 35765], Page et al. 2023:72 [ref. 40505]). Current status: Valid as Macrhybopsis aestivalis (Girard 1856). Leuciscidae: Pogonichthyinae. Distribution: Southern North America: western U.S.A. (Texas and New Mexico) and northern Mexico. Habitat: freshwater.