The West Javan langur (''Trachypithecus mauritius'') is an

Old World monkey Old World monkeys are primates in the family Cercopithecidae (). Twenty-four genera and 138 species are recognized, making it the largest primate family. Old World monkey genera include baboons (genus '' Papio''), red colobus (genus '' Piliocolob ...

from the

Colobinae The Colobinae or leaf-eating monkeys are a family (biology), subfamily of the Old World monkey family that includes 61 species in 11 genus, genera, including the black-and-white colobus, the large-nosed proboscis monkey, and the gray langurs. So ...

subfamily. It was formerly considered a subspecies of '' Trachypithecus auratus'' until it was elevated to a separate species by Roos and Groves in 2008. It is listed as vulnerable by the IUCN. Its range is restricted to the island of Java west of

Jakarta Jakarta (; , Betawi language, Betawi: ''Jakartè''), officially the Special Capital Region of Jakarta (; ''DKI Jakarta'') and formerly known as Batavia, Dutch East Indies, Batavia until 1949, is the capital and largest city of Indonesia and ...

. Its range is currently restricted to Ujung Kulon National Park, Muara Angke Wildlife Reserve and Muara Gembong due to industrial development,

habitat fragmentation Habitat fragmentation describes the emergence of discontinuities (fragmentation) in an organism's preferred environment (habitat), causing population fragmentation and ecosystem decay. Causes of habitat fragmentation include geological proces ...

and the disconnection of protected areas. They are known to eat the leaves and fruits of Sonneratia in mangroves.

References

{{Taxonbar, from=Q20721794 Trachypithecus Primates of Indonesia Endemic fauna of Indonesia Fauna of Java Vulnerable fauna of Asia Mammals described in 1821 Taxa named by Edward Griffith (zoologist)