Rhoadsiinae
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.
The name of this subfamily is derived from that of its type genus, Rhoadsia. This name 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 that genus, R. altipinna.