Atlantic Coastal Forest. Body length 46 to 63cm. Tail 65 to 80cm.
Leaves form the majority of the diet.
Flowers and fruit are also eaten. Usually found in groups of two to four animals. Males remain in their natal groups throughout their lives, they are intolerant of males from other groups. Presumably once occurred in all Atlantic coastal forests of eastern and south-eastern Brazil. Loss of habitat through clearance for settlement and agriculture.