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Trachypithecus
Dusky leaf monkey (Trachypithecus obscurus)
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Mammalia
Order:	Primates
Suborder:	Haplorhini
Infraorder:	Simiiformes
Family:	Cercopithecidae
Subfamily:	Colobinae
Tribe:	Presbytini
Genus:	Trachypithecus Reichenbach, 1862
Type species
Semnopithecus pyrrhus Horsfield, 1823 (= Cercopithecus auratus É. Geoffroy, 1812)
Species
16, see text

Trachypithecus (derived from Greek τραχύς, trachýs meaning "rough" and πίθηκος, píthekos meaning "monkey") is a genus of Old World monkeys containing species known as lutungs, langurs, or leaf monkeys. Their range is much of Southeast Asia (northeast India, Vietnam, southern China, Borneo, Thailand, Java, and Bali).

The name "lutung" comes from the Sundanese language meaning "blackness", ultimately from Proto-Austronesian *luCuŋ (which originally referred to the Formosan rock macaque); it is preferred in one paper because the authors wanted the name langurs to only refer to monkeys in the genus Semnopithecus, although some "lutungs" are now "langurs" again.

Evolution

Genetic analysis indicates that the ancestors of the modern species of lutung first differentiated from one another a little over 3 million years ago, during the late Pliocene. The various species alive today then diverged during the Pleistocene, presumably driven by habitat changes during the Ice Ages. The oldest fossils clearly identified as belonging to the genus date from the middle Pleistocene of Vietnam and Laos; later fossils are also known from Thailand, Java, and Sumatra. The closest living relatives of the lutungs are probably either the gray langurs or the surilis, although the exact relationships remain unclear, possibly due to hybridisation between these genera during the course of their recent evolutionary history.

Taxonomy

As of 2005, the authors of Mammal Species of the World recognize the following Trachypithecus species:

• Genus Semnopithecus
  • formerly T. vetulus group - moved into genus Semnopithecus in most recent classifications
    • Purple-faced langur, Semnopithecus vetulus
    • Nilgiri langur, Semnopithecus johnii
• Genus Trachypithecus
  • T. cristatus group
    • Javan lutung, Trachypithecus auratus
    • "Silvery lutung", silvery langur, etc.: Trachypithecus cristatus, but also used for T. germaini
    • Indochinese lutung or Germain's langur, Trachypithecus germaini
    • Tenasserim lutung, Trachypithecus barbei
  • T. obscurus group
    • Dusky leaf monkey, Trachypithecus obscurus
    • Phayre's leaf monkey, Trachypithecus phayrei
  • T. pileatus group
    • Capped langur, Trachypithecus pileatus
    • Shortridge's langur, Trachypithecus shortridgei
    • Gee's golden langur, Trachypithecus geei
  • T. francoisi group
    • Francois' langur, Trachypithecus francoisi
    • Hatinh langur, Trachypithecus hatinhensis
    • "White-headed langur", Trachypithecus poliocephalus
    • Laotian langur, Trachypithecus laotum
    • Delacour's langur, Trachypithecus delacouri
    • Indochinese black langur, Trachypithecus ebenus

Since then, the T. vetulus group (the purple-faced langur and the Nilgiri langur) have been moved the genus Semnopithecus based on DNA and other evidence.

In 2008, Roos et al. described the Malay Peninsula form of the silvery lutung as a separate subspecies and subsequently it has been elevated to a separate species within the T. cristatus group as the Selangor silvered langur, T. selangorensis. Roos et al. also elevated the West Javan Langur, Trachypithecus mauritius, and Annamese Langur, Trachypithecus margarita, to species status (formerly subspecies of T. auratus and T. germaini, respectively). In 2020, Roos et al. discovered a new species, Popa langur (T. popa), which is found only in Myanmar. Lastly, the White-headed langur (T. leucocephalus), previously thought to be a subspecies of the Francois langur (T. Francois) or Cat Ba langur (T. poliocephalus), is currently recognized as a distinct species by IUCN Red List assessors and the American Society of Mammalogists, based on a 2007 paper by Groves.

This leaves the current understanding of the genus Trachypithecus to be:

Genus Trachypithecus – Reichenbach, 1862 – twenty-one species

Common name	Scientific name and subspecies	Range	Size and ecology	IUCN status and estimated population
Annamese langur	T. margarita (Elliot, 1909)	Southeastern Asia	Size: 40–76 cm (16–30 in) long, plus 57–110 cm (22–43 in) tail Habitat: Forest Diet: Leaves, flowers, and fruit	EN  Unknown
Capped langur	T. pileatus (Blyth, 1843) Three subspecies T. p. brahma T. p. pileatus T. p. tenebricus	Southern Asia	Size: 40–76 cm (16–30 in) long, plus 57–110 cm (22–43 in) tail Habitat: Forest Diet: Leaves, seeds, and fruit, as well as flowers, buds, bark, and caterpillars	VU  Unknown
Cat Ba langur	T. poliocephalus (Pousargues, 1898)	Cát Bà Island, Vietnam (in purple)	Size: 40–76 cm (16–30 in) long, plus 57–110 cm (22–43 in) tail Habitat: Forests and caves Diet: Leaves, flowers, and fruit	CR  30–35
Delacour's langur	T. delacouri (Osgood, 1911)	Northern Vietnam	Size: 40–76 cm (16–30 in) long, plus 57–110 cm (22–43 in) tail Habitat: Forest, rocky areas, and caves Diet: Leaves, flowers, and fruit	CR  240–250
Dusky leaf monkey	T. obscurus (Reid, 1837) Seven subspecies T. o. carbo T. o. flavicauda T. o. halonifer T. o. obscurus T. o. sanctorum T. o. seimundi T. o. styx	Southeastern Asia	Size: 42–61 cm (17–24 in) long, plus 50–85 cm (20–33 in) tail Habitat: Forest Diet: Leaves, shoots, fruit, and seedlings	EN  Unknown
East Javan langur	T. auratus (É. Geoffroy, 1812)	Java and nearby islands in Indonesia	Size: 44–65 cm (17–26 in) long, plus 61–87 cm (24–34 in) tail Habitat: Forest Diet: Leaves and flowers, as well as fruit and insect larvae	VU  Unknown
François' langur	T. francoisi (Pousargues, 1898)	Southern Asia	Size: 40–76 cm (16–30 in) long, plus 57–110 cm (22–43 in) tail Habitat: Forest, rocky areas, and caves Diet: Leaves, fruit, and seeds, as well as insects	EN  2,000–2,100
Gee's golden langur	T. geei (Khajuria, 1956)	Southern Asia	Size: 50–75 cm (20–30 in) long, plus 70–100 cm (28–39 in) tail Habitat: Forest Diet: Fruit, leaves, flowers, seeds, and twigs	EN  6,000–6,500
Germain's langur	T. germaini (A. Milne-Edwards, 1876)	Southeastern Asia	Size: 40–76 cm (16–30 in) long, plus 57–110 cm (22–43 in) tail Habitat: Forest and rocky areas Diet: Leaves, fruit, and flowers	EN  Unknown
Hatinh langur	T. hatinhensis (Dao, 1970)	Vietnam	Size: 40–76 cm (16–30 in) long, plus 57–110 cm (22–43 in) tail Habitat: Forest, rocky areas, and caves Diet: Leaves, as well as fruit, vines, and flowers	EN  Unknown
Indochinese black langur	T. ebenus (Brandon-Jones, 1995)	Southeastern Asia	Size: 40–76 cm (16–30 in) long, plus 57–110 cm (22–43 in) tail Habitat: Forest, rocky areas, and caves Diet: Leaves, as well as fruit, vines, and flowers	EN  Unknown
Indochinese grey langur	T. crepuscula (Elliot, 1909)	Southeast Asia (in red)	Size: 40–76 cm (16–30 in) long, plus 57–110 cm (22–43 in) tail Habitat: Forest, inland wetlands, and rocky areas Diet: Leaves, flowers, and fruit	EN  2,400–2,500
Laotian langur	T. laotum (Thomas, 1911)	Laos	Size: 40–76 cm (16–30 in) long, plus 57–110 cm (22–43 in) tail Habitat: Forest and rocky areas Diet: Leaves, flowers, and fruit	EN  Unknown
Phayre's leaf monkey	T. phayrei (Blyth, 1847) Two subspecies T. p. phayrei T. p. shanicus	Southeast Asia (in green)	Size: 40–76 cm (16–30 in) long, plus 57–110 cm (22–43 in) tail Habitat: Forest Diet: Leaves, as well as bamboo shoots	EN  Unknown
Popa langur	T. popa Roos et al., 2020	Myanmar	Size: 40–76 cm (16–30 in) long, plus 57–110 cm (22–43 in) tail Habitat: Forest Diet: Leaves, flowers, and fruit	CR  130–180
Shortridge's langur	T. shortridgei (Wroughton, 1915)	Southern Asia	Size: 40–76 cm (16–30 in) long, plus 57–110 cm (22–43 in) tail Habitat: Forest Diet: Leaves, flowers, and fruit	EN  Unknown
Selangor silvered langur	T. selangorensis Roos, Nadler, Walter, 2008	Peninsular Malaysia	Size: 40–76 cm (16–30 in) long, plus 57–110 cm (22–43 in) tail Habitat: Forest Diet: Leaves, flowers, and fruit	NT  Unknown
Silvery lutung	T. cristatus (Raffles, 1821) Two subspecies T. c. cristatus T. c. vigilans	Southeastern Asia	Size: 46–56 cm (18–22 in) long, plus 63–84 cm (25–33 in) tail Habitat: Forest Diet: Leaves, as well as fruit, seeds, shoots, flowers, and buds	VU  Unknown
Tenasserim lutung	T. barbei (Blyth, 1847)	Southeastern Asia	Size: 40–76 cm (16–30 in) long, plus 57–110 cm (22–43 in) tail Habitat: Forest Diet: Leaves, flowers, and fruit	VU  Unknown
West Javan langur	T. mauritius (Griffith, 1821)	Island of Java	Size: 40–76 cm (16–30 in) long, plus 57–110 cm (22–43 in) tail Habitat: Forest Diet: Leaves, flowers, and fruit	VU  Unknown
White-headed langur	T. leucocephalus Tan, 1957	Southern China	Size: 40–76 cm (16–30 in) long, plus 57–110 cm (22–43 in) tail Habitat: Rocky areas Diet: Leaves, flowers, and fruit	CR  230–250

Physical description

Lutungs have a rather slim build with a long tail. The fur color varies, depending on the species, from black and grey to orange yellow. Many species have skin designs and a brighter lower surface, the hair on the head is often compared to a hood. Their arms are very short in comparison to the feet and their thumbs are also somewhat shorter. The inner surfaces of the hands and feet are hairless so that their fur does not get caught when reaching into branches. These animals reach a length of 40 to 80 cm and a weight of 5 to 15 kg, with males generally larger than females. A bulge over the eyes and other details, primarily in the head, differentiate it from the surilis.

Habitat and distribution

Lutungs live in the forests, often preferring rain forests, although occasionally they are also found in secluded mountain forests. Lutungs are found in South-east Asia and parts of South Asia from India in the west to China in the east.

Behaviour

They spend the largest part of the day in the trees, where they crawl along the branches on all fours, although they can also jump well from tree to tree. They are diurnal, although more active in the early mornings and the afternoon.

They live in groups of five to 20 animals, mostly in harems, i.e. a single male with several females. Young males must leave their birth group when fully mature, often forming bachelor groups. If a new male takes over a harem, defeating and scaring off the harem leader, he often kills the children of the group. Lutungs are territorial, with loud shouting to defend their territories from other lutung interlopers, resorting to force if the outsiders are not scared off. They have a common repertoire of sounds with which they warn group members. Also, mutual grooming plays an important role.

Lutungs are herbivores, primarily eating leaves, fruits, and buds. To digest the tough leaves, they developed a multichambered stomach.

Reproduction

Rarely twins, a typical single birth comes after a seven-month gestation period. Newborns usually have a golden-yellow fur. The mother shares responsibilities of rearing the young with the other females ("aunties") of the harem. They hand the young around, play with it, carry it, and cuddle it, while the mother searches for food. If the mother dies, another female adopts the young animal. Lutungs are weaned in the latter half of their first year, and reach full maturity at 4 to 5 years. The life expectancy is estimated at 20 years.

References

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Sources

• Nowak, Ronald M. (1999). Walker's Mammals of the World. Vol. 1. Johns Hopkins University Press. ISBN 978-0-8018-5789-8.

External links

• Primate Info Net Trachypithecus factsheets

v t e Haplorhini
Kingdom: Animalia Phylum: Chordata Class: Mammalia Order: Primates
Haplorhini †"Omomyidae" Altanius? Altiatlasius? Bownomomys Kohatius Microchoerinae Indusomys Melaneremia Microchoerus Nannopithex Necrolemur Paraloris Pseudoloris Quercyloris Vectipithex "Anaptomorphinae" Absarokius Anaptomorphus Anemorhysis Arapahovius Aycrossia Chlororhysis Gazinius Pseudotetonius Sphacorhysis Strigorhysis Tatmanius Teilhardina Tetonius Tetonoides Trogolemur Walshina "Omomyinae" Ageitodendron Asiomomys Brontomomys Chipetaia Chumashius Diablomomys Dyseolemur Ekwiiyemakius Gunnelltarsius Hemiacodon Jemezius Loveina Macrotarsius Nesomomys Omomys Ourayia Rooneyia Shoshonius Steinius Stockia Uintanius Utahia Washakius Wyomomys Yaquius Tarkadectinae Tarka Tarkadectes Tarkops Tarsiiformes †Archicebus †Afrotarsiidae? †"Omomyidae"? Tarsiidae Carlito Cephalopachus †Hesperotarsius †Oligotarsius Tarsius †Xanthorhysis? Simiiformes see below↓
Simiiformes Simiiformes †Altiatlasius? †Amamria †Aseanpithecus †Nosmips? †Phileosimias? †Afrotarsiidae? Afrasia Afrotarsius †Eosimiidae Bahinia Eosimias Phenacopithecus †Amphipithecidae Amphipithecus Bugtipithecus? Ganlea Krabia Myanmarpithecus Pondaungia Siamopithecus †Parapithecoidea Arsinoea Biretia Proteopithecidae Proteopithecus Serapia Parapithecidae Abuqatrania Apidium Parapithecus Qatrania Ucayalipithecus Platyrrhini †Parvimico †Perupithecus †Szalatavus †Canaanimico †Branisella †Lagonimico Aotidae Aotus †Tremacebus Pitheciidae †Antillothrix Cacajao Callicebus †Carlocebus †Cebupithecia Cheracebus Chiropotes †Homunculus †Insulacebus †Mazzonicebus †Miocallicebus †Nuciruptor Pithecia Plecturocebus †Proteropithecia †Soriacebus †Xenothrix Atelidae Alouatta Ateles Brachyteles †Caipora †Cartelles †Chilecebus Lagothrix †Mohanamico Oreonax †Paralouatta †Protopithecus †Solimoea †Stirtonia Cebidae †Acrecebus Cebus †Dolichocebus †Killikaike †Panamacebus †Patasola Saimiri Sapajus Callitrichidae Callimico Callithrix Cebuella Leontocebus Leontopithecus Mico †Micodon Saguinus Catarrhini see below↓
Catarrhini Catarrhini †Micropithecus †Saadanius †Oligopithecidae Catopithecus Oligopithecus Talahpithecus †Propliopithecidae Aegyptopithecus Propliopithecus †Pliopithecoidea Krishnapithecus Paidopithex †Kapi Pliopithecidae Epipliopithecus Pliopithecus Dionysopithecidae Dionysopithecus Platodontopithecus Crouzeliidae Anapithecus Barberapithecus Crouzelia Egarapithecus Fanchangia Laccopithecus Plesiopliopithecus Pliobates Cercopithecoidea †Alophe †Victoriapithecidae Noropithecus Nsungwepithecus? Prohylobates? Victoriapithecus Zaltanpithecus Colobinae †Cercopithecoides Colobus †Dolichopithecus †Kuseracolobus †Libypithecus †Mesopithecus †Microcolobus Nasalis †Paracolobus †Parapresbytis Piliocolobus Presbytis Procolobus Pygathrix †Rhinocolobus Rhinopithecus †Sawecolobus Semnopithecus Simias Trachypithecus Cercopithecinae Cercopithecini Allenopithecus Allochrocebus Cercopithecus Chlorocebus Erythrocebus Miopithecus †Nanopithecus Papionini Cercocebus †Dinopithecus †Gorgopithecus Lophocebus Macaca Mandrillus Papio †Paradolichopithecus †Parapapio †Pliopapio †Procercocebus †Procynocephalus Rungwecebus †Soromandrillus Theropithecus Hominoidea see below↓
Hominoidea Hominoidea †Afropithecus †Ekembo †Equatorius †Griphopithecus †Kamoyapithecus? †Kenyapithecus †Morotopithecus †Nacholapithecus †Otavipithecus †Proconsul †Samburupithecus †Dendropithecidae Dendropithecus Micropithecus? Nyanzapithecus Oreopithecus? Rangwapithecus Rukwapithecus Simiolus Turkanapithecus Hylobatidae †Bunopithecus Hoolock Hylobates †Junzi Nomascus Symphalangus †Yuanmoupithecus Hominidae †Buronius †Graecopithecus †Nakalipithecus †Ouranopithecus Ponginae †Ankarapithecus †Gigantopithecus †Indopithecus †Khoratpithecus †Lufengpithecus †Meganthropus Pongo †Sivapithecus Homininae †Dryopithecini Anoiapithecus Danuvius Dryopithecus Hispanopithecus? Pierolapithecus? Rudapithecus Gorillini †Chororapithecus? Gorilla †Nakalipithecus? Hominini Pan Hominina †Ardipithecus? †Australopithecus †Graecopithecus? Homo †Kenyanthropus †Orrorin? †Sahelanthropus? †Paranthropus

• Trachypithecus
• Primates of Asia
• Primate genera
• Taxa named by Ludwig Reichenbach
• Taxa described in 1862