This howler monkey occurs in Brazil. Its mostly black coat contrasts with red hands, feet, and tail tip; an Atlantic Forest study also documented how one group moved through its range.
The coat is mostly black, with reddish hands, feet, and the end of the tail. The face is bare and black; a thick beard is more prominent in adult males.
In a study of one group in Atlantic Forest, sleeping sites and many food trees were concentrated in a core area. Travel routes there were fixed, while the rest of the range was used in rotation.
An extinction-risk assessment has not been added yet.