Rhoadsiinae

Nematobrycon is a genus of freshwater ray-finned fishes belonging to the family Acestrorhamphidae, the American characins. The fishes in this genus are endemic to the Atrato and San Juan River basins in western Colombia.

Rhoadsia is a genus of freshwater ray-finned fishes belonging to the family Acestrorhamphidae, the American characins. The fishes in this genus are endemic to river basins in western Ecuador and Peru. The name of this genus honours Samuel Nicholson Rhoads, the owner of the Franklin Book Shop at 920 Walnut St., Philadelphia and a naturalist in Philadelphia who collected the holotype of the type species of the genus, R. altipinna.

Parastremma is a genus of freshwater ray-finned fishes belonging to the family Acestrorhamphidae, the American characins. The fishes in this genus are endemic to western Colombia.

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.