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PANDUANHEWAN · INDONESIA

Thomas’s Langur

Thomas’s Langur (Presbytis thomasi). Thomas's langur is restricted to northern Sumatra; habitat loss is reported as a pressure, while each local group needs separate assessment.

PanduanHewan·Updated 23 September 2026·Presbytis thomasi
About this guideThis guide was compiled from the listed species sources and observation records; it has not been reviewed by a taxonomic specialist. GBIF records are neither a census nor proof of native range.
Photograph of Thomas’s Langur (Presbytis thomasi).
(c) Ioannis Magouras, some rights reserved (CC BY) · CC BY 4.0 · Photograph cropped for layout.

What is the Thomas’s Langur?

Thomas’s Langur refers to Presbytis thomasi, in the genus Presbytis, family Cercopithecidae, and order Primates. The scientific name follows the accepted taxon in the GBIF Backbone Taxonomy. Common names can vary between places; the scientific name distinguishes this species from relatives.

Evidence: GBIF Backbone Taxonomy — accepted taxon ↗

What is known about the Thomas’s Langur?

Thomas's langur is restricted to northern Sumatra; habitat loss is reported as a pressure, while each local group needs separate assessment.

Read that fact alongside the scientific name and species source, not as proof from an unclear photograph. Populations, ages and taxonomic limits can differ; when identification is uncertain, record the broader group.

Evidence: Species account — background reading ↗

Habitat and field observations of the Thomas’s Langur

Thomas's langurs are recorded in lowland, swamp and riverine forests and some gardens near forest. Documented foods include young leaves, fruit, seeds and flowers.

Evidence: GBIF species treatments — natural-history accounts ↗

How many Indonesian records name the Thomas’s Langur?

When checked on 2026-09-23, the GBIF search returned 398 human-observation records from Indonesia under this species name for 2016–2026. That is a count of indexed records, not an estimate of population, abundance or unique individuals. Observation effort can vary by location, and the count may change as records are added or identifications revised.

Evidence: GBIF occurrence search — Indonesia, human observations, 2016–2026 ↗

Where were observations reported?

Place labels appearing in the results include Sumatera Utara, Aceh, Sumatra - Sumatera Utara. They are labels attached to records, not a complete range map or evidence that the species occurs only there. Some labels may be broad or inconsistent. Check the underlying records before using the location information for field decisions.

Evidence: GBIF occurrence search — Indonesia, human observations, 2016–2026 ↗

How can you observe the Thomas’s Langur?

Watch from a distance, do not feed, and avoid sharing precise locations of vulnerable dens or resting sites. Do not try to catch or touch wild mammals. A well-documented sighting helps others check the identification without turning one encounter into a conservation-status claim.

Explore related animals

To explore this group further, compare Thomas’s Langur with Sumatran Surili, Javan Surili, Southern Pig-tailed Macaque. These links reflect a shared genus, family, order, class or catalogue group; taxonomic proximity does not imply identical habitat needs or conservation status.

Explore related habitats

These habitat relationships are supported by species sources in this guide. This is not a complete range map.

Tropical Rainforests →Freshwater Wetlands →

Sources & references

  1. GBIF Backbone Taxonomy — accepted taxon ↗
  2. GBIF occurrence search — Indonesia, human observations, 2016–2026 ↗
  3. GBIF species treatments — natural-history accounts ↗
  4. iNaturalist — exact species taxon and community observations ↗
  5. Species account — background reading ↗

References can change. Check dates and context in the original source.