The Indochinese grey langur (Trachypithecus crepusculus) is a species of lutung native to East and Southeast Asia.
Taxonomy
It was formerly considered conspecific with Phayre's leaf monkey (T. phayrei), but a 2009 study found it to be a distinct species and the most basal member of the T. obscurus lineage, which contains several other species.[2] Later studies have also found it to be a hybrid species originating from ancient hybridization between ancestral obscurus-group langurs and the Tenasserim lutung (T. barbei).[3][4][5]
Distribution
This species is found throughout Indochina, from northern Thailand east to Vietnam and west to eastern Myanmar, and ranges north to southern China south of the Salween River.[4]
Habitat and ecology
Unlike langurs that live in karst forests, which have a largely terrestrial lifestyle, the Indochinese grey langur inhabits old-growth evergreen forests and has a largely arboreal lifestyle.[6]
Threats
This species' population is only thought to have about 2,400 to 2,500 mature individuals. It is threatened by habitat destruction and, especially in Vietnam and Laos, hunting, the latter of which is thought to have led to rapid declines in the species.[4]
References
-
^ Yongcheng, L.; Nadler, T. & Quyet, L.K. (2021). "Trachypithecus crepusculus". IUCN Red List of Threatened Species. 2021: e.T136920A204397334. Retrieved 18 November 2021.
-
^ Nadler, Tilo. "Evolutionary History and Phylogenetic Position of the Indochinese Grey Langur (Trachypithecus Crepusculus)". Vietnamese Journal of ….
-
^ Roos, Christian; Liedigk, Rasmus; Thinh, Van Ngoc; Nadler, Tilo; Zinner, Dietmar (2017-12-18). "The Hybrid Origin of the Indochinese Gray Langur Trachypithecus crepusculus". International Journal of Primatology. 40 (1): 9–27. doi:10.1007/s10764-017-0008-4. ISSN 0164-0291. S2CID 11460634.
-
^ a b c Quyet, Le Khac; Nadler, Tilo; Group), L. Yongcheng (IUCN SSC Primate Specialist (2015-11-21). "IUCN Red List of Threatened Species: Trachypithecus crepusculus". IUCN Red List of Threatened Species.
-
^ Parks, Creative Commons Attribution-ShareAlike 4 0 International Thai National. "Trachypithecus crepusculus, Indochinese grey langur". Thai National Parks. Retrieved 2021-11-18.
-
^ Ma, Chi; Xiong, Wei-Guo; Yang, Li; Zhang, Lu; Tomlin, Peter Robert; Chen, Wu; Fan, Peng-Fei (2020-07-18). "Living in forests: strata use by Indo-Chinese gray langurs (Trachypithecus crepusculus) and the effect of forest cover on Trachypithecus terrestriality". Zoological Research. 41 (4): 373–380. doi:10.24272/j.issn.2095-8137.2020.047. ISSN 2095-8137. PMC 7340518. PMID 32390372.
