not a species from Argentina:
Crenicichla lacustris (Castelnau, 1855)

published in:
Koerber, S. & J. Casciotta (2012):
On the erroneous records of Crenicichla lacustris (Castelnau, 1855) from freshwaters of Argentina.
Ichthyological Contributions of PecesCriollos 25: 1-4

abstract (from publication):
The cichlid species Crenicichla lacustris has been reported twice from Argentina. The chronology of the records in literature and the specimens these record were based on were analyzed. The records of Crenicichla lacustris from Argentina are considered erroneous and assigned to other species of the genus.