Acestrorhamphidae

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.

Rhoadsiinae, the Pacific tetras, is a subfamily of freshwater ray-finned fishes belonging to the family Acestrorhamphidae, the American tetras. The fishes in this subfamily are found in rivers draining into the Pacific Ocean in Central and South America.