Phalloceros mimbi – sp.nov. from Argentina and Uruguay

Brevidens striatus – comb.nov. from Leporinus

Apistogramma pleurotaenia – not from Argentina

Characidium serrano – first record from Uruguay

Hoplisoma osvaldoi – sp.nov. from Argentina

Urkumayu gen.nov. – with comb.nov. from Hoplisoma

Hypostomus nigropunctatus – first record from Argentina

Megalamphodus eques – comb.nov. from Hyphessobrycon

Bario australis – comb.nov. from Moenkhausia

Bario forestii – comb.nov. from Moenkhausia