NATURAL HISTORY · CATALOGUE RECORD
Pale-thighed Langur
Presbytis siamensis (Müller & Schlegel, 1841)
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
The white-thighed surili (Presbytis siamensis) is a species of primate from the family of old world monkeys (Cercopithecidae). This species lives arboreal amongst the sub-montane forests. It is endemic to the Thai-Malay Peninsula, the Riau Archipelago and Sumatra. In addition, the white-thighed surili contain four subspecies: siamensis (nominate), cana, paenulata and rhionis, are recognized here. Furthermore, they are characterized by the white patches located on the outside of their legs, which is what gives them their name. Additionally, they can be referred to as pale-thighed langur/surili. These primates are an important species for the diversity of forest environments in the Malaysian area.
Wikipedia contributors, White-thighed surili; see linked history · CC BY-SA 4.0 . Plain-text lead excerpt, at most 180 words; no infobox or later sections Retrieved 2026-10-05T07:36:06.552709+00:00. This reference remains separate from the taxonomic record.
Identity & source status
- Scientific name
- Presbytis siamensis (Müller & Schlegel, 1841)
- Name authority
- (Müller & Schlegel, 1841)
- Common name
- Pale-thighed Langur
- 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 siamensis (Müller & Schlegel, 1841)
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 |
| Siberut LangurPresbytis siberu (Chasen & Kloss, 1928) | CercopithecidaeChordata | Accepted speciesRecorded extant |
| North Sumatran Leaf MonkeyPresbytis thomasi (Collett, 1893) | 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 |
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=944254 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:4MBBK. Classification follows source parent identifiers. English common names may vary by region.