Dusky leaf monkey

The dusky leaf monkey, spectacled langur, or spectacled leaf monkey (Trachypithecus obscurus) is a species of primate in the family Cercopithecidae. It is found in Peninsular Malaysia, Myanmar and Thailand;[2] however, dusky leaf monkeys have occasionally been observed in Singapore. It is not clear whether these monkeys are escaped pets or whether they swam to Singapore on their own volition from Johor, Malaysia.[3][4][5]

Dusky leaf monkey[1]
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Primates
Suborder: Haplorhini
Infraorder: Simiiformes
Family: Cercopithecidae
Genus: Trachypithecus
Species group: Trachypithecus obscurus group
Species:
T. obscurus
Binomial name
Trachypithecus obscurus
(Reid, 1837)
Dusky leaf monkey range

Taxonomy

The dusky leaf monkey is a type of lutung or leaf monkey, seven subspecies are currently recognised.[1][6]

  • Trachypithecus obscurus obscurus
  • Trachypithecus obscurus flavicauda
  • Trachypithecus obscurus halonifer
  • Trachypithecus obscurus carbo
  • Trachypithecus obscurus styx
  • Trachypithecus obscurus seimundi
  • Trachypithecus obscurus sanctorum

Ecology

Research in Malaysia found the dusky leaf monkey spends 40% of the day positioning, 33% feeding, 20% moving, and the rest of the time allogrooming (4%), playing (2%), and foraging (1%).[7] It tends to consume leaves growing at higher elevations in the forest canopy.[8] Fruit availability is season-dependent, and although the dusky leaf monkey in Malaysia eats 51% leaves and 40% fruits, it prefers to eat fruit when it is available.[9]

References
  1. Groves, C. P. (2005). Wilson, D. E.; Reeder, D. M. (eds.). Mammal Species of the World: A Taxonomic and Geographic Reference (3rd ed.). Baltimore: Johns Hopkins University Press. p. 177. ISBN 0-801-88221-4. OCLC 62265494.
  2. Boonratana, R.; Ang, A.; Traeholt, C.; Thant, N.M.L. (2020). "Trachypithecus obscurus". IUCN Red List of Threatened Species. 2020: e.T22039A17960562. doi:10.2305/IUCN.UK.2020-2.RLTS.T22039A17960562.en. Retrieved 15 November 2021.
  3. Ang, Andie; Jabbar, Sabrina; Khoo, Max (26 June 2020). "Dusky Langurs Trachypithecus obscurus (Reid, 1837) (Primates: Cercopithecidae) in Singapore: potential origin and conflicts with native primate species". Journal of Threatened Taxa. 12 (9): 15967–15974. doi:10.11609/jott.5818.12.9.15967-15974.
  4. Tan, Audrey (4 July 2020). "Monkey species native to Malaysia spotted in Singapore". Straits Times. Retrieved 2020-07-04.
  5. Thiagarajan, Sumita (7 November 2020). "S'porean encounters derpy-looking dusky langur in toilet at Central Catchment Nature Reserve". Mothership. Retrieved 2020-11-07.
  6. "Trachypithecus obscurus". Integrated Taxonomic Information System. Retrieved 2 November 2021.
  7. Yap, J.; Ruppert, N.; Fadzly, N. (2016). Activity patterns and diet of a group of wild dusky leaf monkeys (Trachypithecus obscurus) in Penang, Malaysia. Seminar Ekologi Malaysia.
  8. Siti-Kauthar, M.; Najmuddin, M. F.; Md-Zain, B. M.; Abdul-Latiff, M. A. B. (2019). PrimaTourism: preliminary study on activity budget of dusky leaf monkey Trachypithecus obscurus obscurus in Bukit Soga Perdana, Batu Pahat, Johor. IOP Conference: Series Earth and Environmental Science. 269. doi:10.1088/1755-1315/269/1/012045.
  9. Ruslin, F.; Matsuda, I.; Md-Zain, B. M. (2018). "The feeding ecology and dietary overlap in two sympatric primate species, the long-tailed macaque (Macaca fascicularis) and dusky langur (Trachypithecus obscurus obscurus), in Malaysia". Primates. 60 (1): 41–50. doi:10.1007/s10329-018-00705-w.
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