White-fronted surili
| White-fronted surili | |
|---|---|
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Mammalia |
| Order: | Primates |
| Family: | Cercopithecidae |
| Genus: | Presbytis |
| Species: | P. frontata |
| Binomial name | |
|
Presbytis frontata (Müller, 1838) |
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| White-fronted surili range | |
| Synonyms | |
|
nudifrons Elliot, 1909 |
|
nudifrons Elliot, 1909
The white-fronted surili (Presbytis frontata) is a species of primate in the family Cercopithecidae. It is endemic to the large international island of Borneo, in Indonesia, Malaysia, and possibly Brunei.
Its body is mainly grey-brown, with a distinct white spot on the forehead. Its chin and lower cheeks are greyish. Its natural habitat is subtropical or tropical dry forests. It is threatened by habitat loss.
The white-fronted surili has a tall sagittal crest that leans forward. This species' dorsal body is mainly greyish brown and ventral side is yellowish brown in coloration, with a distinct white spot on the forehead. The tail is yellowish grey, with blackish coloration of hands, feet, brow, crown crest and cheeks. There is light colored frontal patch on the crown crest. This species has a sacculated stomach to assist in the breakdown of cellulose and also has enlarged salivary glands. The incisors are narrow and the molars have a sharp, high crest. The jaw is deep and the face is short and broad. The thumb is reduced and the hindlimbs are longer than the forelimbs. The average body mass for the adult male is 5.67 kg and for adult females is 5.56 kg.
There are two subspecies, P. f. frontata and P. f. nudifrons. P. f. frontata is brownish in colour, with darker arms, legs, top and sides of the head and tail. The chin and lower cheeks are greyish. The white spot on the forehead is roughly triangular in shape. Meanwhile, P. f. nudifrons is dark greyish with blackish hands, feet and base of tail. The underparts and distal end of tail are paler grey-brown with white throat. The white spot on the forehead is rather square compare to P. f. frontata and is divided by a vertical line of short black hairs.
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