Presbytis hosei 

Scope: Global
Language: English

Translate page into:

Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Chordata Mammalia Primates Cercopithecidae

Scientific Name: Presbytis hosei (Thomas, 1889)
Infra-specific Taxa Assessed:
Common Name(s):
English Hose’s Langur, Gray Leaf Monkey, Grey Leaf Monkey, Hose's Leaf Monkey
French Semnopithèque De Hose
Spanish Langur De Hose
Taxonomic Notes: There are strong indications that the canicrus subspecies can be separated from the others as a distinct species (Meijaard and Groves unpubl. data). The subspecies hosei is based on just a few specimens (type locality) and is of unclear taxonomic status.

Assessment Information [top]

Red List Category & Criteria: Vulnerable A2cd ver 3.1
Year Published: 2008
Date Assessed: 2008-06-30
Assessor(s): Nijman, V., Meijaard, E. & Hon, J.
Reviewer(s): Mittermeier, R.A. & Rylands, A.B. (Primate Red List Authority)
This species is considered Vulnerable in light of a continuing decline of the population inferred from extensive habitat loss and hunting. Habitat loss was probably between 30-50% of the range in the past 30 years (approximately three generations). Where the species does remain it is heavily hunted.
Previously published Red List assessments:

Geographic Range [top]

Range Description:Presbytis hosei is found in northern Borneo, specifically northern Sarawak and Sabah (Malaysia), northern East Kalimantan (Indonesia), and Brunei Darussalam (Nijman 2004). The southern boundary of the species' range is not yet clear, and the distribution map should be regarded as provisional.

Presbytis hosei hosei may only be found around the lower Baram River in coastal Sarawak, Malaysia (Groves 2001).

Presbytis hosei everetti is found in Brunei, Indonesia (Kalimantan) and Malaysia (Sabah and Sarawak). The range extends from about latitude 2°40’N to Mount Kinabalu and along the northwestern coast of Sabah into Brunei (Groves 2001).

Presbytis hosei sabana is confined to central and eastern Sabah, and perhaps also in far northeastern Kalimantan (Groves 2001).

Presbytis hosei canicrus is found on the eastern coast of Borneo (Kalimantan, Indonesia), from Kutai to Gunung Talisayan (Groves 2001).
Countries occurrence:
Brunei Darussalam; Indonesia (Kalimantan); Malaysia (Sabah)
Additional data:
Upper elevation limit (metres):1600
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:A population in the Kayan Mentarang National Park in East Kalimantan was assessed by counts along transects as well as data from all other encounters. A follow-up census 7 years later concluded that densities had dropped by 50-80%, and the species had become rare to observe. It is suggested that hunting for various reasons was the principal cause of this decline (Nijman 2004, 2005).

In Brunei, average size is 6 individuals per group (Hon pers. comm.); this may be the last stronghold for this species. Densities for P. h. sabana are estimated at 2.1 groups/km2, or approximately 16 individuals/km2; estimates for P. h. everetti are 1.3 groups/km2, or approximately 10.1 individuals/km2; estimates for P. h. canicus are 2.3 groups/km2, or approximately 19 individuals/km2 (V. Nijman pers comm.).
Current Population Trend:Decreasing
Additional data:
Population severely fragmented:No

Habitat and Ecology [top]

Habitat and Ecology:This species occurs in lowland to hill dipterocarp rainforest (on Mount Kinabalu). It is known from sea-level up to approximately 1,000 m elevation, with records to 1,600 m (Goodman 1989) and possibly higher. Animals occasionally enter plantations. It is primarily folivorous, but will consume flowers, fruits and seeds, as well as eggs and nestlings.

Use and Trade [top]

Use and Trade: It is hunted for lucrative “bezoar stones” (visceral secretions used in traditional “medicines”). These monkeys are also hunted for food.

Threats [top]

Major Threat(s): Though not totally impervious, Hose’s sureli is relatively tolerant of forest disturbance. However, hunting poses the biggest danger to this species. The hunting of surelis correlates with the presence of inland settlements, the timber industry, and a demand for lucrative “bezoar stones” (visceral secretions used in traditional “medicines”). These monkeys are also hunted for food and to deter crop-raiding (Nijman 2004).

Conservation Actions [top]

Conservation Actions: This species is legally protected in Indonesia, though wrongly named P. aygula, a misidentification that may serve to subvert prosecution of offenders. P. aygula is the former name for P. comata, a species with which P. hosei has sometimes been incorrectly lumped in the past. It is listed on CITES Appendix II. The largest population in a protected area is found in Kayan Mentarang, East Kalimantan (Nijman 2005), and the next largest protected area that harbors P. hosei is the Betung-Kerihun / Lanjak Entimau trans-boundary reserves in West Kalimantan and Sarawak (Nijman 2004). These protected habitats do not prevent the decline of many forest species, including Hose’s sureli, however, due to the absence of meaningful enforcement of laws to prevent illegal hunting (Nijman 2005). The species occurs as well in Kutai National Park (Indonesia) and in Mount Kinabalu National Park (Malaysia). There are no specimens reported in captivity.

Citation: Nijman, V., Meijaard, E. & Hon, J. 2008. Presbytis hosei. The IUCN Red List of Threatened Species 2008: e.T18128A7666166. . Downloaded on 21 September 2018.
Disclaimer: To make use of this information, please check the <Terms of Use>.
Feedback: If you see any errors or have any questions or suggestions on what is shown on this page, please provide us with feedback so that we can correct or extend the information provided