not a species from Argentina:
Phalloptychus januarius (Hensel, 1868)

published in:
Koerber, S. & T. Litz (2009):
On the erroneous records of Phalloptychus januarius (Hensel, 1868) from freshwaters of Argentina.
Ichthyological Contributions of PecesCriollos 15: 1-3

abstract (from publication):
The poecillid species Phalloptychus januarius has been reported repeatedly from Argentina. The chronology of the records in literature is analyzed and the records of Phalloptychus januarius from Argentina are tentatively assigned to species of the genus Phalloceros.