Species that contain: Istlarius and balsanus [ 2 ] records

balsanus, Istlarius Jordan [D. S.] & Snyder [J. O.] 1899:118, Fig. 2 [Bulletin of the U. S. Fish Commission v. 19 [1899]; ref. 2501] Río Ixtla, at Puente de Ixtla, Morelos, Mexico. Holotype: CAS 106149 (formerly CAS-SU 6149). Paratypes: BMNH 1900.9.29.81-83 (3), CAS-SU 6208 (9). Type catalog: Böhlke 1953:42-43 [ref. 12291], Gilbert 1998:209 [ref. 23395], Ferraris 2007:208 [ref. 29155]. •Valid as Ictalurus balsanus (Jordan & Snyder 1899) -- (Burgess 1989:35 [ref. 12860], Espinosa Pérez et al. 1993:26 [ref. 22290], Gilbert 1998:209 [ref. 23395], Nelson et al. 2004:81 [ref. 27807], Miller 2006:160 [ref. 28615], Scharpf 2006:15 [ref. 30386], Ferraris 2007:208 [ref. 29155], Rodiles-Hernández et al. 2010:67 [ref. 31022], Page et al. 2013:83 [ref. 32708], Page et al. 2023:79 [ref. 40505], Pérez-Rodríguez et al. 2023:9 [ref. 40420]). Current status: Valid as Ictalurus balsanus (Jordan & Snyder 1899). Ictaluridae. Distribution: Southern North America: Balsas River basin, Pacific slope (Mexico). Habitat: freshwater.

occidentalis, Istlarius balsanus de Buen [F.] 1946:119 [Revista de la Sociedad Mexicana de Historia Natural v. 7 (nos 1-4); ref. 12981] Río Huámito, at La Huacana, Río Balsas drainage, Michoacan, Mexico. Syntypes: whereabouts unknown. Type catalog: Gilbert 1998:222 [ref. 23395]. •Synonym of Ictalurus balsanus (Jordan & Snyder 1899) -- (Gilbert 1998:222 [ref. 23395], Ferraris 2007:208 [ref. 29155]). Current status: Synonym of Ictalurus balsanus (Jordan & Snyder 1899). Ictaluridae. Habitat: freshwater.