Comments: Formerly included as a subspecies of A. fasciatus. Includes eyed surface fishes with relatively high genetic variability and eyeless cave forms with relatively low genetic variability; in at least one cave the two forms interbreed (see Nelson 1984); there is some question as to whether cave and noncave populations are conspecific, though available evidence suggests that they are (see Lee et al. 1980). Removed from Cypriniformes and placed in Characiformes by Nelson (1984) and in the 1991 AFS checklist (Robins et al. 1991).