NATURAL HISTORY · CATALOGUE RECORD
Cat Ba Langur
Trachypithecus poliocephalus (Trouessart, 1911)
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 Cat Ba langur (Trachypithecus poliocephalus), also known as the golden-headed langur, is a critically endangered species of langur endemic to Cát Bà Island, Vietnam. It is among the rarest primates in the world, and possibly the rarest primate in Asia, with population size estimated at less than 70 individuals.
Wikipedia contributors, Cat Ba langur; see linked history · CC BY-SA 4.0 . Plain-text lead excerpt, at most 180 words; no infobox or later sections Retrieved 2026-10-05T08:05:04.049726+00:00. This reference remains separate from the taxonomic record.
Identity & source status
- Scientific name
- Trachypithecus poliocephalus (Trouessart, 1911)
- Name authority
- (Trouessart, 1911)
- Common name
- Cat Ba Langur
- Rank
- species
- Accepted status
- accepted
- Kingdom
- Animalia
- Phylum
- Chordata
- Class
- Mammalia
- Order
- Primates
- Family
- Cercopithecidae
- Genus
- Trachypithecus
- 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
- genusTrachypithecus Reichenbach, 1862
- speciesTrachypithecus poliocephalus (Trouessart, 1911)
Close classified relatives
These entries share the source’s genus, Trachypithecus. They are not necessarily the closest relatives established by molecular evidence.
| Species | Classification | Source status |
|---|---|---|
| Indochinese Gray LangurTrachypithecus crepusculus (Elliot, 1909) | CercopithecidaeChordata | Accepted speciesRecorded extant |
| Delacour's LangurTrachypithecus delacouri (Osgood, 1932) | CercopithecidaeChordata | Accepted speciesRecorded extant |
| Laos LangurTrachypithecus laotum (Thomas, 1921) | CercopithecidaeChordata | Accepted speciesRecorded extant |
| Annamese LangurTrachypithecus margarita (Elliot, 1909) | CercopithecidaeChordata | Accepted speciesRecorded extant |
| Phayre's LangurTrachypithecus phayrei (Blyth, 1847) | CercopithecidaeChordata | Accepted speciesRecorded extant |
| Selangor Silvery LangurTrachypithecus selangorensis Roos, Nadler & Walter, 2008 | CercopithecidaeChordata | Accepted speciesRecorded extant |
| Hatinh LangurTrachypithecus hatinhensis (Dao, 1970) | CercopithecidaeChordata | Accepted speciesRecorded extant |
| East Javan LangurTrachypithecus auratus (É. Geoffroy Saint-Hilaire, 1812) | CercopithecidaeChordata | Accepted speciesRecorded extant |
| Tenasserim LangurTrachypithecus barbei (Blyth, 1847) | CercopithecidaeChordata | Accepted speciesRecorded extant |
| Silvered LangurTrachypithecus cristatus (Raffles, 1821) | CercopithecidaeChordata | Accepted speciesRecorded extant |
| Francois' LangurTrachypithecus francoisi (de Pousargues, 1898) | CercopithecidaeChordata | Accepted speciesRecorded extant |
| Gee's Golden LangurTrachypithecus geei Khajuria, 1956 | 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 |
|---|---|
| Trachypithecus poliocephalus poliocephalus (Trouessart, 1911) (Trouessart, 1911) | 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=944702 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:57SDP. Classification follows source parent identifiers. English common names may vary by region.