[2] This species originates from the lower portions of rivers from Venezuela to northern Brazil.

[2] It occurs in the Orinoco delta, through the Guianas, to the Amazon River to the island of Trinidad.

[3] A. aspredo is the largest species of aspredinid, reaching about 38.3 centimetres (15.1 in) SL.

[4][5] The maxillary barbels are attached to the head, the colouration is uniform without any pattern of dark saddles, and the unculiferous tubercles present in other aspredinids are highly reduced.

[3] This species practices an unusual method of incubation of the eggs, attaching them to the underside of the female who then carries them around.