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Trachypithecus hatinhensis

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Taxonomy [top]

Kingdom Phylum Class Order Family
ANIMALIA CHORDATA MAMMALIA PRIMATES CERCOPITHECIDAE

Scientific Name: Trachypithecus hatinhensis
Species Authority: (Dao, 1970)
Common Name/s:
English Hatinh Langur, Stripe-headed Black Langur
Synonym/s:
Trachypithecus ebenus (Brandon-Jones, 1995)
Trachypithecus francoisi subspecies hatinhesis (Dao, 1970) [orth. error]
Taxonomic Notes: This species is here considered monotypic (Groves 2001). However it may well represent a subspecies of Trachypithecus laotum. The form ebenus is sometimes considered as a distinct species, but more likely represents a morph of this species as there is no genetic difference between ebenus and hatinhensis (Roos 2004). More material is necessary for clarification.

Assessment Information [top]

Red List Category & Criteria: Endangered A2cd ver 3.1
Year Published: 2008
Date Assessed: 2008-06-30
Assessor/s: Xuan Canh, L., Khac Quyet, L., Thanh Hai, D. & Timmins, R.J.
Reviewer/s: Mittermeier, R.A. & Rylands, A.B. (Primate Red List Authority)
Justification:
Listed as Endangered as the species is likely to have undergone a decline of more than 50% over the last three generations (36 years, given a generation length of 12 years) due to the ongoing loss and decline of habitat and effects of hunting.
History:
2000 Endangered
2000 Endangered

Geographic Range [top]

Range Description: Although the historical range of this species may once have been much more extensive, it seems to be currently restricted to limestone areas in the western part of Quang Binh and Quang Tri Provinces (from 19°39’N, 105°29’E south to 16°10’N, 107°40’E), and in the eastern part of Khammouan Savannakhet Provinces in Lao PDR (Nadler et al. 2003). Its range in Lao PDR appears to be limited (Nadler et al. 2003), where it has only been recorded with certainty from Hin Nam No National Biodiversity Conservation Area (Duckworth et al. 1999). The western limit of the range of the species in Lao PDR is unclear. In Viet Nam, it is confirmed from Tuyen Hoa, Minh Hoa, Bo Trach, Le Thuy, and Quang Ninh districts in Quang Binh Province (Nadler et al. 2003) and Huoug Hoa in Quang Tri Province (BirdLife International 2005). There is no current evidence for the distribution of the species north of Quang Binh, but the extent of limestone suggests that historically it may well have occurred further north. Records from Gia Lai Province are based on misidentification. The form ebenus is restricted to Khammouane and Savannakhet Provinces in Lao PDR, with a marginal extension into the western part of Quang Binh Province, Viet Nam. The precise limits of the range are unclear, particularly in Viet Nam. The overlap zones of this form with laotum and hatinhensis are not well defined.
Countries:
Native:
Lao People's Democratic Republic; Viet Nam
Range Map: Click here to open the map viewer and explore range.

Population [top]

Population: There is no reliable population estimate available for this species. The Phong Nha-Khe Bang area probably has the largest remaining single population of hatinhensis globally (Nadler et al. 2003). Sightings in Lao PDR are occasional (Nadler et al. 2003). Although a large area of suitable habitat remains in Phong Nha, population density appears very low (Nadler et al. 2003). Based on interviews and field observations, Pham Nhat et al. (1996) estimated 530-670 individuals in Phong Nha-Ke Bang; 50-70 in the Hoa Son area; 250-350 in the Thuong Hoa area; and 200-250 in the Phong Nha area. However, this is very likely to be a significant underestimate of the size of this population, and may also include individuals currently assigned to the form T. ebenus in Lao PDR. Individuals assigned to T. ebenus are also hatinhensis, assuming it is confirmed that this form is only a morph of the species.
Population Trend: Decreasing

Habitat and Ecology [top]

Habitat and Ecology: This species is typically found in forested habitats associated with karst/limestone environments (Pham Nhat 2002). The natural habitat in Quang Binh and Quang Tri is now restricted to a band of forest near the Lao border (Nadler et al. 2003), and forests are heavily degraded in Tuyen Hoa and northern Minh Hoa Districts (Pham Nhat et al. 1996a). In Lao PDR, the species is associated with non-limestone rock outcrops on steep or precipitous mountain slopes. It reaches approximately 1,500 m in elevation. It is folivorous, terrestrial and arboreal, and diurnal.
Systems: Terrestrial

Threats [top]

Major Threat(s): The main threat to this species is hunting, as shooting of primates is quite common throughout its range (Nadler et al. 2003). The animals are killed for meat, as well as for traditional “medicine” and the wildlife trade (Nadler et al. 2003). Snaring is reported to be the predominant hunting method in Phong Nha-Ke Bang (Timmins et al. 1999), with an increase since 1996 (Nadler et al. 2003). Hunting with rifles has appeared to diminish since 1995, probably due to gun legislation controls, confiscation of guns by local authorities, and a decrease of hunting success (Nadler et al. 2003). Road construction around Phong Nha-Ke Bang National Park has increased hunting and illegal logging (Nadler et al. 2003). Habitat loss is also a problem in some areas.

Conservation Actions [top]

Conservation Actions: This species is listed on CITES Appendix II. It is found in Phong Nha-Ke Bang National Park in Viet Nam (Nadler et al. 2003), and small numbers are present as well in Nakai Nam Theun National Biodiversity Conservation Area. A protected area has been proposed in Quang Tri Province, but there is a need for the elimination of poaching of this species. Nadler et al. (2003) outlines the following recommended conservation action for the species in Viet Nam: conduct further field status surveys and reinforcement of conservation in the protected areas network.
There is a need for further survey and taxonomic research to resolve the status of this species relative to T. laotum and T. ebenus, and to determine the current population status of this species with more accuracy.
Citation: Xuan Canh, L., Khac Quyet, L., Thanh Hai, D. & Timmins, R.J. 2008. Trachypithecus hatinhensis. In: IUCN 2013. IUCN Red List of Threatened Species. Version 2013.2. <www.iucnredlist.org>. Downloaded on 19 April 2014.
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