It occurs only in the rainforests of Masoala, in the northeast of the island. It is one of the largest primates of Madagascar with a body length of 53 cm, a tail length of 60 cm and a weight of 3.3–3.6 kg.
This primate is specifically described as being endemic to the rainforests of Masoala in Madagascar. It is one of the largest primates found on the island, with specific measurements of body length (53 cm), tail length (60 cm) and weight (3.3–3.6 kg).