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Gray langurs have stable populations in some areas and declining ones in others. [62] Both the black-footed gray langur and Kashmir gray langur are considered threatened. [3] [20] The latter is the rarest species of gray langur, with less than 250 mature individuals remaining. [3] In India, gray langurs number at around 300,000. [63]
The Javan surili (Presbytis comata) is a vulnerable species of Old World monkey endemic to the western half of Java, Indonesia, a biodiversity hotspot.Other common names by which it is known by include gray, grizzled or Sunda Island surili; grizzled or stripe-crested langur; Javan grizzled langur; grizzled, Java or Javan leaf monkey; langur gris.
[2] [3] Their German name of Mützenlanguren ("capped langurs") comes from the hair on their head, which forms a tuft. They differ from the other langurs by characteristics in the shape of their head (particularly the poorly developed or absent brow ridges, and the prominent nasal bones), [2] in the teeth, and by the size of their small thumbs ...
The northern plains gray langur belongs to the genus Semnopithecus along with the other Indian langurs. The southern plains gray langur was once classified as a subspecies of S. entellus, i.e., S. entellus dussumieri and later regarded as a separate species, i.e., S. dussumieri, but is now regarded as an invalid taxon.
The southern plains gray langur [1] was the common name ascribed to Semnopithecus dussumieri by Mammal Species of the World (3rd edition) in 2005. [1] Along with several other Semnopithecus, it had been previously considered a subspecies of the northern plains gray langur, Semnopithecus entellus, i.e., Semnopithecus entellus dussumieri. [2]
The order Primates consists of 505 extant species belonging to 81 genera. This does not include hybrid species or extinct prehistoric species. Modern molecular studies indicate that the 81 genera can be grouped into 16 families; these families are divided between two named suborders and are grouped in those suborders into named clades, and some of these families are subdivided into named ...
The black-footed gray langur was previously considered to be a subspecies of Semnopithecus entellus. Research done in 2003 by Brandon-Jones may indicate that it is a subspecies of Semnopithecus dussumieri. Some experts believe that the species may be a naturally occurring hybrid of Semnopithecus johnii and Semnopithecus dussumieri.
Unlike langurs that live in karst forests, which have a largely terrestrial lifestyle, the Indochinese grey langur inhabits old-growth evergreen forests and has a largely arboreal lifestyle. [ 6 ] Threats