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Text and photos by Nick Baker, unless credited to others.
Copyright ゥ Ecology Asia 2024







East Sumatran Banded Langur

Family : Cercopithecidae
Species : Presbytis percura

Head-body length : up to 59 cm ?
Tail length : up to 76 cm ?
Weight : maximum approx. 7.5 kg ?

Presbytis percura (East Sumatran Banded Langur) is a critically endangered primate from the lowlands of Riau Province on the island of Sumatra, Indonesia. It was formerly considered a subspecies of Presbytis femoralis (Raffles' Banded Langur, Banded Leaf Monkey) but DNA sequencing has resurrected it as a valid, unique species (Ang et al, 2020). 

This species occurs in fragmented, unprotected forests and its survival is at risk due to continuing lowland forest loss and forest degradation due to deliberate burning. In addition, individuals are sometimes killed after entering fruit orchards. (Rizaldi et al, 2019).

This shy leaf monkey is mainly blackish, with a dark grey head. The inner side of each limb, the underside of the chin and parts of the chest are pale. The tail is mainly black. 

IUCN summarise its habitat use as "mixed mangrove, primary freshwater, riverbank, primary lowland logged, scrub-grassland riverbank, and secondary riverbank habitats". It is also known to enter rubber plantations and feed on leaves and seeds of Hevea brasiliensis (see Fig 2). 

A conservation action plan is urgently needed for this largely unstudied primate.

Figs 1 to 3 : Three examples from rubber plantations in Riau Province. The langur in Figure 2 is holding a seed case of Hevea brasiliensis in its mouth. Photos thanks to Andie Ang.

References :

Ang, A., Roesma, D.I., Nijman, V., Meier, R., Srivathsan, A. and Rizaldi. 2020. Faecal DNA to the rescue: Shotgun sequencing of non-invasive samples reveals two subspecies of Southeast Asian primates to be Critically Endangered species. Scientific Reports 10: 9396.

Rizaldi, Ilham, K., Prasetio, I., Lee, Z.H., Jabbar, S. and Ang, A. 2019. Preliminary study on the distribution and conservation status of the East Sumatran banded langur Presbytis femoralis percura in Riau Province, Sumatra, Indonesia. Asian Primates Journal 8(1): 25-36.

Links : IUCN assessment (2021)



Fig 1

ゥ  Andie Ang

Fig 2

ゥ  Andie Ang

Fig 3

ゥ  Andie Ang