NATURAL HISTORY · CATALOGUE RECORD
North Sumatran Leaf Monkey
Presbytis thomasi (Collett, 1893)
Source-backed taxonomic record
Accepted species in Catalogue of Life’s 11 September 2026 base release. This preserves the source classification and available supporting data; it is not a completed species monograph.
Open encyclopedia reference
Thomas's langur (Presbytis thomasi), also known as the North Sumatran leaf monkey or Thomas's leaf monkey, is a species of primate in the family Cercopithecidae. It is endemic to northern Sumatra, Indonesia, not living to the south and east of Lake Toba and the Alas and Wampu rivers. Its natural habitat is subtropical or tropical dry forests. It is threatened by habitat loss. Its native names are reungkah in Acehnese and kedih in Alas. It can be found in Gunung Leuser National Park, where substantial populations exist in Ketambe and Bukit Lawang.
Wikipedia contributors, Thomas's langur; see linked history · CC BY-SA 4.0 . Plain-text lead excerpt, at most 180 words; no infobox or later sections Retrieved 2026-10-05T12:43:05.035321+00:00. This reference remains separate from the taxonomic record.
Identity & source status
- Scientific name
- Presbytis thomasi (Collett, 1893)
- Name authority
- (Collett, 1893)
- Common name
- North Sumatran Leaf Monkey
- Rank
- species
- Accepted status
- accepted
- Kingdom
- Animalia
- Phylum
- Chordata
- Class
- Mammalia
- Order
- Primates
- Family
- Cercopithecidae
- Genus
- Presbytis
- Extinction status
- Recorded extant
Classification family tree
Nested taxonomic groups from the source. This is not a direct-ancestor chain, a dated evolutionary tree or a phylogenetic reconstruction.
- domainEukaryota (Chatton, 1925) Whittaker & Margulis, 1978
- kingdomAnimalia
- phylumChordata
- subphylumVertebrata
- infraphylumGnathostomata
- parvphylumOsteichthyes
- megaclassTetrapoda
- classMammalia Linnaeus, 1758
- subclassTheria Parker & Haswell, 1897
- infraclassEutheria Gill, 1872
- orderPrimates Linnaeus, 1758
- suborderHaplorrhini Pocock, 1918
- infraorderSimiiformes Haeckel, 1866
- superfamilyCercopithecoidea Gray, 1821
- familyCercopithecidae Gray, 1821
- subfamilyColobinae Jerdon, 1867
- tribePresbytini Gray, 1825
- genusPresbytis Eschscholtz, 1821
- speciesPresbytis thomasi (Collett, 1893)
Close classified relatives
These entries share the source’s genus, Presbytis. They are not necessarily the closest relatives established by molecular evidence.
| Species | Classification | Source status |
|---|---|---|
| Banded LangurPresbytis femoralis (Martin, 1838) | CercopithecidaeChordata | Accepted speciesRecorded extant |
| White-fronted LangurPresbytis frontata (Müller, 1838) | CercopithecidaeChordata | Accepted speciesRecorded extant |
| Gray Leaf MonkeyPresbytis hosei (Thomas, 1889) | CercopithecidaeChordata | Accepted speciesRecorded extant |
| Natuna Island SuriliPresbytis natunae (Thomas & Hartert, 1894) | CercopithecidaeChordata | Accepted speciesRecorded extant |
| Mentawai LangurPresbytis potenziani (Bonaparte, 1856) | CercopithecidaeChordata | Accepted speciesRecorded extant |
| Pale-thighed LangurPresbytis siamensis (Müller & Schlegel, 1841) | CercopithecidaeChordata | Accepted speciesRecorded extant |
| Siberut LangurPresbytis siberu (Chasen & Kloss, 1928) | CercopithecidaeChordata | Accepted speciesRecorded extant |
| Miller's LangurPresbytis canicrus Miller, 1934 | CercopithecidaeChordata | Accepted speciesRecorded extant |
| Grizzled Leaf MonkeyPresbytis comata (Desmarest, 1822) | CercopithecidaeChordata | Accepted speciesRecorded extant |
| Robinson's Banded LangurPresbytis robinsoni Thomas, 1910 | CercopithecidaeChordata | Accepted speciesRecorded extant |
| Black-crested Sumatran LangurPresbytis melalophos (Raffles, 1821) | CercopithecidaeChordata | Accepted speciesRecorded extant |
| Mitered LangurPresbytis mitrata Eschscholtz, 1821 | CercopithecidaeChordata | Accepted speciesRecorded extant |
Names & synonyms
Names explicitly linked to this accepted taxon in the source. Synonymy can change with revision.
| Recorded name | Source status |
|---|---|
| Presbytis thomasi nubilus Miller, 1942 Miller, 1942 | synonym |
Documented distribution
Source distribution statements, not a complete range map. A listed locality is not necessarily a place of origin.
Source literature & publication evidence
References attached to this source record, including nomenclatural citations where supplied. This is a selected bibliography; abbreviated citations remain in the source’s form.
- https://www.itis.gov/servlet/SingleRpt/SingleRpt?search_topic=TSN&search_value=573048 Source fields: Taxon.tsv dwc:namePublishedIn, Taxon.tsv dcterms:references
Origins, evidence & remaining research
Name authority and publication references document nomenclature where the source supplies it. They do not establish evolutionary origins or the earliest fossil occurrence.
Specimen-level evidence, morphology, ecological research, phylogenetic studies, a comprehensive bibliography and a located literary passage have not yet been compiled for this record. A suitable sourced image remains to be added.
Dataset citation & attribution
This exact taxon in ChecklistBank · Catalogue of Life 2026-09-11
Catalogue of Life 2026-09-11; dataset 316321; doi:10.48580/dgz5n. https://creativecommons.org/licenses/by/4.0/ . Retrieved 5 October 2026.
Stable key: col:4MBBP. Classification follows source parent identifiers. English common names may vary by region.