first record from Argentina:
Characidium heirmostigmata Graça & Pavanelli, 2008

published in:
Casciotta, J., A. Almirón, K. Doubnerová, L. Piálek & O. Říčan (2015):
First records of Characidium heirmostigmata and C. serrano (Characiformes: Crenuchidae) from freshwaters of Argentina.
Ichthyological Contributions of PecesCriollos 34: 1-3

abstract (from publication):
Characidium heirmostigmata and C. serrano are registered for the first time in freshwaters of Argentina in the province of Misiones. Characidium heirmostigmata was found in the middle río Paraná basin and C. serrano in upper and middle río Uruguay basin