not from Argentina:
Ctenobrycon multiradiatus (Steindachner, 1876)
abstract (from publication):
The presence of Ctenobrycon multiradiatus (Steindachner, 1876) in faunal lists for Argentina is attributed to a read error of Ringuelet et al. (1967). The species is considered not to be distributed in Argentina.
published in:
Koerber, S. (2011):
On the erroneous listing of Ctenobrycon multiradiatus from Argentina.
Ichthyological Contributions of PecesCriollos 20: 1-2