Acnodon senai is a species of serrasalmids found in South America.

It is found in the Jari River basin in Brazil.

This species reaches a length of 13.2 cm (5.2 in).

[1][2] The fish is named in the memory of fisheries worker Anazildo Mateus de Sena, Instituto Nacional de Pesquisas da Amazônia in Manaus, who collected the type specimen during one of his last trips to the field in June 1987.

This Characiformes-related article is a stub.