This howler monkey has mostly black fur and lives in the south-central Amazon of Brazil. It feeds on leaves and fruit in the trees and lives in groups.
Its skin and fur are predominantly black, with dense fur around the cheeks and chin. It has a long prehensile tail and a protruding muzzle.
Groups of about 5 to 19 have been reported. They eat varied plant foods, including leaves and fruit, and also eat insects.
An extinction-risk assessment has not been added yet.