Stichonodontinae

species of fish

Hasemania is a genus of freshwater ray-finned fishes belonging to the family Acestrorhamphidae, the American characins. The species in this genus are endemic to Brazil, where only found in river basins that originate on the Brazilian Shield, ranging west to the Juruena system, north to the São Francisco system and south to the Paraná system. The individual species generally have quite small ranges and two, H. crenuchoides and H. piatan, are considered threatened by Brazil's Ministry of the Environment.

Moenkhausia is a genus of freshwater ray-finned fishes belonging to the family Acestrorhamphidae, the American characins. They are found in tropical and subtropical South America and are medium-sized tetras, where the largest species only reach around .

Stethaprioninae is a subfamily of freshwater ray-finned fishes belonging to the family Acestrorhamphidae, the American characins. The fishes in this subfamily are found in South America.

Nematocharax is a genus of freshwater ray-finned fishes belonging to the family Acestrorhamphidae, the American characins. The species are endemic to Brazil. The generic name alludes to (nḗmatos), "threaded", referring to the long, thread-like fins; and Charax, a common name for genera in the order Characiformes, from (chárax), meaning a pointed stake in a palisade, referring to their dentition.