tuca, Crenicichla Piálek [L.], Dragová [K.], Casciotta [J. R.], Almirón [A. E.] & Říčan [O.] 2015:9, Figs. 2A, 3B, 4A-B, 5 [Historia Natural, Tercera Serie v. 5 (no. 2) (for 27 May); ref. 33984] Misiones Province, lower Iguazú River above Iguazú Falls, arroyo Deseado, Argentina, 25°40’11.7"S, 53°55’59.5"W. Holotype: MLP 10818 (ex MACN-ict 9522). Paratypes: MLP. Type catalog: Nadalin & López 2015:10 [ref. 34112]. •Valid as Crenicichla tuca Piálek, Dragová, Casciotta, Almirón & Říčan 2015 -- (Koerber et al. 2015:3 [ref. 35179], Říčan et al. 2017:7 [ref. 35070], Koerber et al. 2017:8 [ref. 35083], Koerber et al. 2017:9 [ref. 35632], Piálek et al. 2019:394 [ref. 36110], Koerber et al. 2019:10 [ref. 36736], Mirande & Koerber 2020:2 [ref. 37594], Reis et al. 2020:472 [ref. 38364], Varella et al. 2023:5 [ref. 40273], Říčan et al. 2023:55 [ref. 40289]). Current status: Valid as Crenicichla tuca Piálek, Dragová, Casciotta, Almirón & Říčan 2015. Cichlidae: Cichlinae. Distribution: South America: Iguaçu River basin, Argentina and Brazil. Habitat: freshwater.