Trachypithecus laotum | Laotian Langur
Good spot: Phou Hin Boun National Biodiversity Conservation Area, Khammouane Province, Lao PDR
Trachypithecus laotum is a monotypic species (no subspecies).
Khammouane and Borikhamxai Provinces in Lao PDR
IUCN Conservation Status
Its taxonomic status relative to Hatinh Langur requires clarification, although there is a clear genetic difference between the two .
 Roos C., 2004. Molecular evolution and systematics of Vietnamese primates. In: Nadler T., Streicher U. and Ha Thang Long (eds), Conservation of primates in Vietnam, Frankfurt Zoological Society, Vietnam Primate Conservation Programme, Endangered Primate Rescue Center, Cuc Phuong National Park, Hanoi, Hanoi, Vietnam.
 Nadler T., 2009. Observations of Lao langurs (Trachypithecus [laotum] laotum) and black langurs (Trachypithecus [laotum] hatinhensis morph ebenus) in Khammouane Province, Laos and remarks to their systematic position. Vietnamese Journal of Primatology 1 (issue 3): 9-15.
 Steinmetz R., Timmins R.J. &, Duckworth J.W., 2011. Distribution and conservation status of the Lao leaf monkey (Trachypithecus (francoisi) laotum). International Journal of Primatology 32: 587-604.
Illustration by Stephen Nash
Page Last Updated: 7 February 2014
Seeing this Species
They have been observed in the northern part of Phou Hin Boun National Biodiversity Conservation Area (NBCA), Khammouane Province, Lao PDR .
Even better, Steinmetz et al. (2011) offer a map and a table of 15 years of sightings, including GPS coordinates, time of day, and the reaction of the langurs . The map is included below. The table is too large to include but it is an incredible resource.
Probability of Success: ?