The tail of this species is not prehensile but does serve a balancing function when locomoting (Kinzey, 1981). The dental formula is 2:1:3:3 on both the upper and lower jaws (Ankel-Simons, 2000). The first two lower molars have relatively long shearing crests that is an adaptation of having leaves in the diet (Kinzey and Gentry, 1979). In this species the hindlimbs are relatively shorter than the forelimbs (Ankel-Simons, 2000). The average body mass for this species ranges from 1200-1500 grams (Aquino and Encarnacion, 1994).
This species has three subspecies, each having a different pelage coloration:
- Callicebus cupreus cupreus: The ventral side, sideburns, and legs are reddish in color (Hershkovitz, 1990). The upper and outer sides of the trunk and the crown are buffy agouti in color (Hershkovitz, 1990). The forehead has the same coloration as the crown except for some blackish fringe (Hershkovitz, 1990).
- Callicebus cupreus discolor: The forehead has a whitish or buffy colored tuft that contrasts with the agouti colored region of the anterior crown (Hershkovitz, 1990). The sideburns, side of the neck, lower arms, legs, chest, and belly are reddish in color (Hershkovitz, 1990). The crown, sides of body, back, and tail of this subspecies are agouti in color (Hershkovitz, 1990). The terminal third of the tail is predominately buffy in color (Hershkovitz, 1990).
- Callicebus cupreus ornatus: On the forehead there is a pale frontal blaze, a pale strip across the forehead (Hershkovitz, 1990). The crown is colored reddish brown to nearly blackish with the base of the hairs whitish or buffy (Hershkovitz, 1990). The sideburns, ventral side, inner side of limbs, outer side of legs, and lower part of forearms are reddish in coloration (Hershkovitz, 1990). The digits are pale contrasting with that of the lower forearms (Hershkovitz, 1990). The outer side of the thighs and the upper arms are buffy agouti in color in this subspecies (Hershkovitz, 1990).