|Red List Category & Criteria:
||Butynski, T.M., Struhsaker, T. & De Jong, Y.
||Mittermeier, R.A. & Rylands, A.B. (Primate Red List Authority)
Listed as Endangered because of its small extent of occurrence (52 km²), and the increasingly smaller and more isolated patches of habitat. The species is not listed as Critically Endangered because the range is not considered to be severely fragmented or a single location. Although this apparently arboreal species has not been observed moving between habitat patches during the day, there is apparently some movement taking place at night which appears to be helping to ensure the continued survival of the groups in the seemingly isolated patches. The area also cannot be considered a single location as there are different threats operating and the main threat, habitat loss, is not impacting the whole area equally. But it is reasonable to assume that the species occurs at less than five locations and there is continuing decline due to the current rapid destruction of habitat. This species requires regular monitoring as it could very quickly move into the Critically Endangered category.