Cephalophus johnstoni, Thomas, 1901

Don E. Wilson & Russell A. Mittermeier, 2011, Bovidae, Handbook of the Mammals of the World – Volume 2 Hoofed Mammals, Barcelona: Lynx Edicions, pp. 444-779 : 727

256.

Johnston's Duiker

Cephalophus johnstoni

French: Céphalophe de Johnston / German: Johnston-Ducker / Spanish: Duiker de Johnston

Taxonomy. Cephalophus johnston: Thomas, 1901 ,

Toro, Uganda.

Until recently, C. johnston : was considered to be a subspecies of C. weynsi . Johnston's Duiker may perhaps hybridize with C. harvey : in Kenya. Monotypic.

Distribution. E DR Congo, S Sudan, Uganda, and W Kenya.

Descriptive notes. Very few specific measurements available, but head-body 89-7 cm (a single specimen from Mount Elgon), tail c¢. 10 cm; weight unknown. Skull measurements ofJohnston's Duiker are much smaller than Weyns’s Duiker (C. weynsi ), there is no overlap between the two species; body weight is likely less than that of Weyns’s Duiker. Coatis thick and both woollier and darker in color than that of Weyns’s Duiker. Overall color ofJohnston's Duiker is deep reddish-brown, becoming darker and less reddish on the shoulders and neck. The limbs are brown and darken to almost black at the hooves. The underparts are brown. The tail is rufous to black above with a white underside; the terminal tuft is a mix of white and brown hairs. The forehead is covered with a mix of rufous and black hairs, leading to a deep chestnut or maroon-colored coronal tuft. The muzzle is dark; the lips and chin are contrastingly white. Ears are brown on their external surface with a white border along the edges; the insides are white. Short, straight horns are found in both sexes. Horn length is 8:8-10. 7 cm in males, 3.5-3. 7 cm in females. Dental formula is10/3%,C0/1,P 3/3. M 3/5 (2) = 32.

Habitat. Forests, bush thickets, and “grassyjungles” up to 3000 m.

Food and Feeding. Likely frugivorous, but no detailed observations have been made. One individual was observed consuming large quantities of Spathodea sp. flowers in Uganda. This species is known to browse on Podocarpus milanjianus seedlings in plantations.

Breeding. There is little specific information available forthis species. Infants are darker and browner in color than adults; they have a speckled or grizzled appearance due to strong light and dark bands on the hairs.

Activity patterns. There is no specific information available for this species, but presumably diurnal like Weyns’s Duiker and Peters’s Duiker ( C. callipygus ).

Movements, Home range and Social organization. There is no information available for this species.

Status and Conservation. Classified as Least Concern on The IUCN Red List (under C. weynst). The speciesis believed to be common in Uganda, whereit is one of the dominant herbivores in forest patches. Its status elsewhere is unknown.

Bibliography. East (1999), Groves (2010), Groves & Grubb (1974), Grubb & Groves (2001), Jackson (1956), IUCN/SSC Antelope Specialist Group (2008p), Kingdon (1982), Lydekker (1914), Wilson (2001).

Figures

On following pages: 259. Western White-bellied Duiker (Cephalophus leucogaster); 260. Uele White-bellied Duiker (Cephalophus arrhenii); 261. Red-flanked Duiker (Cephalophus rufilatus); 262. Natal Red Duiker (Cephalophus natalensis); 263. Harvey's Duiker (Cephalophus harveyi); 264. Black-fronted Duiker (Cephalophus nigrifrons); 265. ltombwe Duiker (Cephalophus hypoxanthus); 266. Rwenzori Duiker (Cephalophus rubidus); 267. Mount Elgon Duiker (Cephalophus fosteri); 268. Mount Kenya Duiker (Cephalophus hooki)

Distribution. E DR Congo , S Sudan , Uganda , and W Kenya .