Sena's Pacu

Acnodon senai told apart from A. oligacanthus by the possession of two closely set rows of premaxillary teeth, and by the lack of a black humeral spot. The meristic and anatomical characters shown by this species are more similar to those of A. normani although it has a slightly different body shape.

Acnodon senai is endemic to Brazil where it is only known to occur in the Jari River basin, and all the records are from the part of the basin which will be affected by the Santo Antônio do Jari hydroelectric plant (UHE).

== References ==

Acnodon senai is classified in the genus Acnodon, a name which prefixies a-, meaning without, onto knodon, which means "the projecting teeth on a hunting spear", an allusion to the mistaken perception that the type species of the genus, A. oligacanthus, does not have a spine in front of its dorsal fin, it actually does but it is very small. The specific name honors 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.