Hemiodontidae

The Hemiodontidae are a small family of freshwater characins found in northern South America, south to the Paraná-Paraguay Basin. The larger species are popular food fish.

thumb|Hemiodus gracilis Hemiodus is a genus of halftooths from South America with the greatest species richness in the Amazon Basin, but also found in the Orinoco, Essequibo, Paraná–Paraguay and Parnaíba River basins. Depending on the species involved, these elongate fish reach a length of .

Bivibranchia s a genus of freshwater ray-finned fishes belonging to the family Hemiodontidae, the halftooths. The fishes in this genus are found in tropical South America.

Argonectes is a genus of freshwater ray-finned fishes belonging to the family Hemiodontidae, the halftooths. The fishes in this genus are found in tropical South America.

Anodus is a genus of freshwater ray-finned fishes belonging to the family Hemiodontidae, the halftooths. The fishes in this genus are found in tropical South America.