istlanus, Heros Jordan [D. S.] & Snyder [J. O.] 1899:144, Fig. 21 [Bulletin of the U. S. Fish Commission v. 19 [1899]; ref. 2501] Río Ixtla at Puente de Ixtla, Río Balsa basin, Morelos, Mexico. Holotype: CAS-SU 6150. Paratypes: ANSP 27137 (10, received from SU), BMNH 1900.9.29.53-54 [from Jordan] (2), MNHN 1901-0236 [ex SU] (1), CAS-SU 6205 (15), ZMUC uncat. (1). Type catalog: Böhlke 1953:81 [ref. 12291], Blanc 1962:213 [ref. 20868], Nielsen 1974:69 [ref. 9588]. •Valid as Nandopsis istlana (Jordan & Snyder 1899) -- (Burgess 2000:48 [ref. 24818] as istlanum). •Valid as Parapetenia istlana (Jordan & Snyder 1899) -- (Hernandez-Rolon 1990:12 [ref. 20688]). •Valid as Cichlasoma istlanum (Jordan & Snyder 1899) -- (Conkel 1993:121 [ref. 22949], Espinosa Pérez et al. 1993:68 [ref. 22290], Kullander in Reis et al. 2003:623 [ref. 27061] as incertae sedis in 'Cichlasoma', Nelson et al. 2004:152 [ref. 27807], Scharpf 2009:5 [ref. 30400], Page et al. 2013:156 [ref. 32708]). •Valid as "Cichlasoma" istlanum (Jordan & Snyder 1899) -- (Miller 2006:363 [ref. 28615]). •Valid as Amphilophus istlanus (Jordan & Snyder 1899) -- (Říčan et al. 2016:37 [ref. 34357], Page et al. 2023:136 [ref. 40505]). Current status: Valid as Amphilophus istlanus (Jordan & Snyder 1899). Cichlidae: Cichlinae. Distribution: Southern North America: Pacific Slope of Mexico. Habitat: freshwater.