balsanus, Melaniris Meek [S. E.] 1902:117, Pl. 28 lower [Field Columbian Museum, Zoölogical Series v. 3 (no. 6); ref. 2957] Río Balsas at Balsas, Guerrero, Mexico. Holotype: FMNH 3706. Paratypes: ANSP 90844 (5); FMNH 3707 (92), 72562 (7); CAS-SU 21444 (9); UMMZ 162469 (10, 1 c&s), USNM 55793 (10). Type catalog: Ibarra & Stewart 1987:55 [ref. 12367], Böhlke 1984:23 [ref. 13621]. Whether balsanus is a noun or adjective not researched. •Valid as Atherinella balsanus (Meek 1902) -- (Chernoff 1986:149 [ref. 5848], Chernoff 1986:242 [ref. 5847], Espinosa Pérez et al. 1993:57 [ref. 22290], Castro-Aguirre et al. 1999:193 [ref. 24550] as balsana, Dyer 2000:104 [ref. 26677], Dyer in Reis et al. 2003:515 [ref. 27061] as balsana, Nelson et al. 2004:97 [ref. 27807] as balsana, Miller 2006:188 [ref. 28615] as balsana, Scharpf 2007:6 [ref. 30398] as balsana, Page et al. 2013:99 [ref. 32708] as balsama, Page et al. 2023:138 [ref. 40505]). Current status: Valid as Atherinella balsana (Meek 1902). Atherinopsidae: Menidiinae. Distribution: Southern North America: Balsas River basin (Pacific slope of Mexico). Habitat: freshwater.