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;[3][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.[4][5][6]

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

Habitation and activity patterns
Lutung in urban area in Taman Rakan, Kajang.

Scan and sampling of 13 individuals (2 adult males, 8 adult females, 3 juveniles) was done by researchers from University Sains Malaysia. The researchers found that most of the dusky leaf monkeys spent their times positioning. The time that the dusky leaf monkey spent posting was estimated to be 40%. Researchers also found that the individuals spent approximately 33% of their time feeding on the leaves of the plants. In this research, researchers found these dusky leaf monkeys feeding on 10 different forest plant species on a regular basis. Dusky leaf monkeys tend to consume leaves which grow at higher elevations such as in the canopy level of a forest.[7]

Subspecies

There are several subspecies of this lutung:[1]

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

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. Retrieved 12 July 2020.CS1 maint: multiple names: authors list (link)
  3. "Dusky Leaf Monkey". aboutanimals. Retrieved 30 May 2020.
  4. 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.
  5. Tan, Audrey (4 July 2020). "Monkey species native to Malaysia spotted in Singapore". Straits Times. Retrieved 2020-07-04.
  6. Thiagarajan, Sumita (7 November 2020). "S'porean encounters derpy-looking dusky langur in toilet at Central Catchment Nature Reserve". Mothership. Retrieved 2020-11-07.
  7. M, Siti-Kauthar & Faudzir, Najmuddin & Md zain, Badrul munir & M.A.B, Abdul-Latiff. (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. 10.1088/1755-1315/269/1/012045.
  • Yap, Joleen & Ruppert, Nadine & Fadzly, Nik. (2016). Activity patterns and diet of a group of wild dusky leaf monkeys (Trachypithecus obscurus) in Penang, Malaysia (2016).

Data related to Trachypithecus obscurus at Wikispecies Media related to Trachypithecus obscurus at Wikimedia Commons

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