Trachypithecus margarita | Annamese Silvered Langur

 

Good spot: Tà Cú Nature Reserve, Bình Thuận Province, Việt Nam

Primatology

 

Taxonomy & Occurrence

Trachypithecus margarita is a monotypic species (no subspecies).

 

This species was previously listed under Indochinese Silvered Langur, but was recently elevated to a distinct species because of morphology and genetics [1,9].

 

It is found in southern Lao PDR, south-central Vietnam, and eastern Cambodia (Ratanakiri and Mondulkiri Provinces).

 

IUCN Conservation Status

Endangered (but as a synonym of Indochinese Silvered Langur)

 

During the 1950s–1990s, populations of Annamese Silvered Langur and Indochinese Silvered Langur were almost universally considered conspecific with the  better-known, widespread and numerous Silvered Leaf Monkey of Sundaic SE Asia (Malay peninsula, Borneo, Sumatra and associated small islands) [2].

 

Recent morphological and molecular analyses suggest, however, that these Sundaic and non-Sundaic populations are not conspecific, although this view is not universal [3]. Additionally, some used Indochinese Silvered Langur for all non-Sundaic populations [4,5], while others separated them into two species [1,6,7,8,9]: Annamese Silvered Langur to the east of the Mekong and Indochinese Silvered Langur to the west (although this barrier is not yet confirmed) [9].

 

 

© Tran Van Bang

Ta Kou Nature Reserve, Vietnam

Seeing this Species

 

A distinguishing feature of all langurs in the Trachypithecus group is the orange fur coat of their infants. So, keep a lookout for bright orange objects!

 

Ta Kou Nature Reserve, Binh Thuan Province, Vietnam

The area right around the majestic Reclining Buddha is a good spot to see the langurs. 

Please see my page on Black-shanked Douc to find out more about Ta Kou Nature Reserve.

 

Probability of success: ◆ ◆ ◆ ◇ ◇

 

Overlapping species: Pygmy Loris, Long-tailed Macaque, Northern Pig-tailed Macaque, Stump-tailed Macaque, Black-shanked Douc 

 

Other sites:

Cat Tien National Park, Dong Nai Province, Vietnam

Please see my page on Southern Yellow-cheeked Crested Gibbon to find out more about Cat Tien National Park.

 

Overlapping species: Pygmy Loris, Long-tailed Macaque, Northern Pig-tailed Macaque, Black-shanked Douc, Southern Yellow-cheeked Crested Gibbon 

 

Local contacts: Ms. Minh Nguyen (hnim23@gmail.com)

 

 

 

© Adam Pérou Hermans

Ta Kou Nature Reserve, Vietnam

© Andie Ang

Ta Kou Nature Reserve, Vietnam

References

[1] Hoang Minh Duc, Covert H.H., Roos C. & Nadler T., 2012. A note on phenotypical and genetic differences of silvered langurs in Indochina (Trachypithecus germaini and T. margarita). Vietnamese Journal of Primatology 2 (issue 1): 47-54.

[2] Timmins R.J., Steinmetz R., Poulsen M.K., Evans T.D., Duckworth J.W. & Boonratana R., 2013. The Indochinese Silvered Leaf Monkey Trachypithecus germaini (sensu lato) in Lao PDR. Primate Conservation 26: 75-87.

[3] Brandon-Jones D., Eudey A.A., Geissmann T., Groves C.P., Melnick D.J., Morales J.C., Shekelle M. & Stewart C.-B., 2004. Asian primate classification. International Journal of Primatology 25: 97-164.

[4] Groves C.P., 2001. Primate taxonomy. Smithsonian Institution Press, Washington, D.C.

[5] Groves C.P., 2005. Order Primates. In: Mammal species of the world, 3rd edition, Wilson D.E. & Reeder D.M. (eds.), Johns Hopkins University Press, Baltimore, M.D.: 111-184.

[6] Nadler T., Walter L. & Roos C., 2005. Molecular evolution, systematics and distribution of the taxa within the silvered langur species group (Trachypithecus [cristatus]) in Southeast Asia. Zoologische Garten 75: 238-247.

[7] Francis C.M., 2008. A field guide to the mammals of Southeast Asia. New Holland, London.

[8] Roos C., Nadler T. & Walter L., 2008. Mitochondrial phylogeny, taxonomy and biogeography of the silvered langur species group (Trachypithecus cristatus). Molecular Phylogenetics and Evolution 47: 629-636.

[9] Roos C., Boonratana R., Supriatna J., Fellowes J.R., Rylands A.B. & Mittermeier R.A., 2013. An updated taxonomy of primates in Vietnam, Laos, Cambodia, and China. Vietnamese Journal of Primatology 2 (issue 2): 13-26.

 

 

Page Last Updated: 11 February 2019

This site remains a work in progress. Links are in blue

Content by Andie Ang unless otherwise stated

© 2014-2020 | Andie Ang

CONTACT