Hisonotus aky comb.nov. from Epactionotus

Heptapterus qenqo sp.nov. from Tucumán, Argentina

Heptapterus mbya sp.nov. from Misiones, Argentina

Heptapterus mandimbusu sp.nov. from Misiones, Argentina

Gymnotus sylvius – first record from Argentina

Gymnotus pantanal – first record from Argentina

Gymnotus inaequilabiatus – confirmed for Argentina

Gymnotus carapo – confirmed for Argentina by G. c. australis ssp.nov. from Misiones

Gymnorhamphichthys hypostomus – not a species from Argentina

Gymnorhamphichthys britskii – first record from Argentina