Cercopithecus diana


Taxonomy [top]

Kingdom Phylum Class Order Family

Scientific Name: Cercopithecus diana
Species Authority: (Linnaeus, 1758)
Infra-specific Taxa Assessed:
Common Name(s):
English Diana/roloway Monkey, Roloway Monkey, Diana Guenon, Diana Monkey
French Cercopithèque Diane
Spanish Diana
Taxonomic Notes: There are two named subspecies: C. d. diana and C. d. roloway (see Kingdon 1997; Grubb et al. 2003). Groves (2005) elevated both to full species.

Assessment Information [top]

Red List Category & Criteria: Vulnerable A2cd ver 3.1
Year Published: 2008
Date Assessed: 2008-06-30
Assessor(s): Oates, J.F., Gippoliti, S. & Groves, C.P.
Reviewer(s): Mittermeier, R.A. & Rylands, A.B. (Primate Red List Authority)
Listed as Vulnerable as this species is believed to have declined by more than 30% in the course of the past 27 years (three generations) mainly as a result of habitat loss and hunting.
2000 Endangered
1996 Vulnerable
1994 Vulnerable (Groombridge 1994)
1990 Vulnerable (IUCN 1990)
1988 Vulnerable (IUCN Conservation Monitoring Centre 1988)
1986 Vulnerable (IUCN Conservation Monitoring Centre 1986)

Geographic Range [top]

Range Description: This species is found in the forests of Upper Guinea in West Africa, ranging from coastal south-eastern Guinea to Sierra Leone, Liberia, southern Côte d'Ivoire, and southwestern Ghana. There range may extend to Burkina Faso. There are also historical museum records and some reports of this species in Togo to the east of Lake Volta (see Campbell et al. 2008 for summary).

There are two subspecies: the subspecies C. d. diana ranges from coastal south-eastern Guinea to the River Sassandra in Côte d'Ivoire; C. d. roloway is found from the River Sassandra in the east to the River Pra in Ghana.
Côte d'Ivoire; Ghana; Guinea; Liberia; Sierra Leone
Range Map: Click here to open the map viewer and explore range.

Population [top]

Population: It appears to be a rare and declining species throughout the majority of its range, with C. d. roloway much rarer than C. d. diana in the west. In Ghana, Roloway Guenons have been steadily extirpated from both unprotected and protected areas (for example, Bia National Park) and the monkey is nearing extinction in that country if it has not disappeared already (McGraw and Oates 2007).
Population Trend: Decreasing

Habitat and Ecology [top]

Habitat and Ecology: This largely arboreal species occurs in the canopy of primary and old secondary lowland moist forest, and riverine and gallery forest. It is rare in degraded forest, but it appears that it can survive in lightly logged forest where the canopy remains
Systems: Terrestrial

Threats [top]

Major Threat(s): This species is generally threatened by hunting and habitat degradation and loss. The relatively large size of this species and the value of its meat and skin makes it a preferred game species. Large-scale deforestation in the region, through logging, conversion to agricultural land and charcoal production, continues to reduce the habitat available to this species (McGraw 1998; McGraw and Oates 2007).

Conservation Actions [top]

Conservation Actions: This species is listed on Appendix I of CITES and on Class A of the African Convention on the Conservation of Nature and Natural Resources. They Roloway Monkey has previously been recorded from a number of protected areas across the region. However, very recent surveys failed to confirm the presence of Roloways in four reserves in western Ghana including one — Krokosua Hills Forest Reserve — believed to harbor the monkey only several years earlier. It is possible that Ankasa Resource Reserve still contains a few Roloway individuals; a thorough survey of Ankasa, and of the Dadieso Forest Reserve (where the monkey was also reported in the recent past) should be a high priority (McGraw and Oates 2007). In neighboring Côte d’Ivoire, the Roloway guenon is not known from any protected areas. Surveys formerly documented them in two forests, namely the Yaya Forest Reserve and wet forest adjacent to the Ehy Lagoon (McGraw and Oates 2007). However, field surveys made in 2004 failed to document them at additional sites in southern Côte d’Ivoire, although hunters indicate that Roloways are present in small numbers in the Parc National des Iles Ehotilé (Kone and Akpatou 2005). Further investigations are needed in the forest zone along the Togo-Ghana border to confirm or refute the presence of Roloway Monkeys in Togo (Campbell et al. 2008).

The nominate subspecies is better off than its conspecific, and occurs on Mt. Nimba, part of which is a designated World Heritage Site. To protect this primate there is a need to protect large areas of mature forest from logging and conversion to agricultural land.

Citation: Oates, J.F., Gippoliti, S. & Groves, C.P. 2008. Cercopithecus diana. The IUCN Red List of Threatened Species. Version 2014.3. <>. Downloaded on 01 April 2015.
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