Trachypithecus barbei (Blyth, 1847)

Russell A. Mittermeier, Anthony B. Rylands & Don E. Wilson, 2013, Cercopithecidae, Handbook of the Mammals of the World – Volume 3 Primates, Barcelona: Lynx Edicions, pp. 550-755 : 747

149.

Tenasserim Langur

Trachypithecus barbei

French: Langur de Barbe / German: Tenasserim-Brillenlangur / Spanish: Langur de Tenasserim

Other common names: Barbe's Langur, Tenasserim Lutung

Taxonomy. Presbytis barbei Blyth, 1847 ,

Burma, Ye, south of Moulmein.

The rather mysterious forms originally known, respectively, as Presbytis argenteus and Semnopithecus holotephreus are variously treated under this species or with 7. phayre, and may be in some way distinct. The argenteus morph is silver, while holotephreus 1s ashy-gray. 1. barbeiis a member of the obscurus species group, which also includes 1. obscurus , 1. crepusculus , and 1. phayre:. 1: phayrei occurs to the north, 71. obscurus to the south, and 7. germaini to the south-east, with which it is sympatric. Monotypic.

Distribution. E Myanmar and W Thailand, confined to a small region N of the Thai-Malai Peninsula (14° 20°-15° 10° N, 98° 30°-98° 55’ E).

Descriptive notes. There are no specific measurements available. General color of the Tenasserim Languris grayish black with no silvering, and only slightly lighter ventrally. Tail is dark gray, slightly paler than body. Root of tail and area around ischial callosities are whitish. Long, upright crown hairs form a distinct crest. Face is gray with a violet tinge. Whitish eye-rings fully encircle eyes, and there is depigmentation around mouth.

Habitat. Precise habitat preferences are unclear. Habitats within the distribution of the Tenasserim Langur include mixed deciduous dipterocarp and moist evergreen forest.

Food and Feeding. There is no information available for this species.

Breeding. There is no information available for this species.

Activity patterns. There is no information available for this species.

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

Status and Conservation. CITES Appendix II. Classified as Data Deficient on The [UCN Red List. The Tenasserim Langur is known only from museum specimens, some sightings in the wild dating back to the 1970s, and three captive individuals. Its distribution is estimated to encompass 10,000-12,000 km? and it is not known to occur in any protected areas. Presumably hunting and habitat loss are major threats. There is an urgent need for additional surveys to determine its current population status, the limits of its distribution, and its habitat preferences.

Bibliography. Agrawal (1974), Eudey (1979), Geissmann et al. (2004), Groves (2001), Groves, Brockelman & Geissmann (2008), Hill (1936), Khajuria & Agrawal (1979), Osterholz et al. (2008).

Figures

149. Tenasserim Langur (Trachypithecus barber), 150. Dusky Langur (Trachypithecus obscurus), 151. Phayre’s Langur (Trachypithecus phayrei), 152. Indochinese Gray Langur (Trachypithecus crepusculus), 153. Cat Ba Langur (Trachypithecus poliocephalus), 154. White-headed Langur (Trachypithecus leucocephalus), 155. Delacour’s Langur (Trachypithecus delacouri), 156. Francois’s Langur (Trachypithecus francoisi), 157. Black Langur (Trachypithecus ebenus), 158. Laos Langur (Trachypithecus laotum), 159. Hatunh Langur (Trachypithecus hatinhensis)

Distribution. E Myanmar and W Thailand, confined to a small region N of the Thai-Malai Peninsula (14° 20°-15° 10° N, 98° 30°-98° 55’ E).