Pristellinae

Hemigrammus is a genus of freshwater ray-finned fishes belonging to the family Acestrorhamphidae, the American characins. The fishes in this genus are found in South America, including Trinidad, and commonly seen in the aquarium trade. These are medium-small tetras where the largest species reach up to around .

Gymnocorymbus is a genus of freshwater ray-finned fishes belonging to the family Acestrorhamphidae, the American characins. The fishes in this genus are found in the Amazon, Paraguay, Orinoco, Courantyne, Gurupí and Parnaíba river basins in South America. These tetras are popular in the aquarium trade.

Pristella is a genus of freshwater ray-finned fishes belonging the family Acestrorhamphidae, the American characins. It was formerly a monotypic taxon only containing Pristella maxillaris, but in 2019 a second species, Pristella ariporo, was described.