australis, Extrarius Hubbs [C. L.] & Ortenburger [A. I.] 1929:26 [University of Oklahoma Bulletin, New Series, no. 434, Publications of the University Oklahoma Biological Survey v. 1 (no. 2) (for Apr. 1929); ref. 10902] Red River, 6-9 miles southwest of Hollis, Harmon County, Oklahoma, U.S.A. Holotype: UMMZ 80347. Paratypes: AMNH 10105 [ex UMMZ 80349] (2); BMNH 1933.1.24.6-8 [ex UMMZ] (3); MCZ 32694 [ex UMMZ 80349] (1); UMMZ 80348-49 (3, 410), 80376 (37), 80383-84 (43, 1), 80410 (1); UOMZ; USNM 93433 (1), 117528 (10). Type catalog: Gilbert 1998:46-47 [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]). •Valid as Macrhybopsis australis (Hubbs & Ortenburger 1929) -- (Gilbert 1998:46-47 [ref. 23395], Eisenhour 1999:969 [ref. 24184], Underwood et al. 2003:493 [ref. 27126], Nelson et al. 2004:72 [ref. 27807], Miller & Robison 2004:126 [ref. 27931], Eisenhour 2004:28 [ref. 29854], Scharpf 2005:24 [ref. 28940], 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 australis (Hubbs & Ortenburger 1929). Leuciscidae: Pogonichthyinae. Distribution: North America: Red River (southern-central U.S.A.) Habitat: freshwater.