Descrizione originale come Crenicichla iguassuensis:
ZooBank:9D210167-C53A-449C-8309-6908D340D8B5.
- Haseman, John D.. 1911. "An annotated catalog of the cichlid fishes collected by the expedition of the Carnegie Museum to central South America, 1907-10". Annals of the Carnegie Museum. 329-373 (crc00340)
Conservazione: Crenicichla iguassuensis è valutata dalle organizzazioni internazionali di salvaguardia delle specie a rischio come (LC) basso rischio (2018). Crenicichla iguassuensis is widely distributed species in the Iguaçu River basin, where it is frequent and abundant, with no significant threats that endanger their population (ICMBio, 2022).