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Ha Tinh Langur (Trachypithecus hatinhensis)


MORPHOLOGY:
This species has a sacculated stomach to assist in the breakdown of cellulose. The Ha Tinh langur has enlarged salivary glands to assist it in breaking down food. This species has slim hands and feet and reduced thumbs. The dental formula of the Ha Tinh langur is 2:1:2:3 on both the upper and lower jaws (Ankel-Simons, 2000). The pelage coloration of this species is black overall, with brown-white hairs along the cheeks from the mouth to the ears (Dao, 1970; cited in Le, 1992/1993). Females have yellow-white hairs running from the mouth to the ears (Lippold and Vu, 1994). On the nape of the neck there are a trace of white hairs (Dao, 1970; cited in Le, 1992/1993). This species has a long tail that is held above the back in an S-curve (Lippold and Vu, 1994; Groves, 2001). The head and body length ranges from 500-665 millimeters and the tail length ranges from 810-870 millimeters (Groves, 2001).

RANGE:
The Ha Tinh langur is found in the country of Vietnam (Le and Campbell, 1993/1994; Le, 1992/1993; Weitzel and Vu, 1992; Pham et al., 1996/1997). Le (1992/1993) found this species to occur in Phong Nha forest and in the Vu Quang area of Ha Tinh province in Vietnam. Lippold and Vu (1994) found the Ha Tinh langur in the Kong Cha Rang Nature Reserve in Gia Lai Province. Pham et al. (1996/1997) found this species to occur in Hoason, Minhhoa district, Quang Binh province. This species lives in limestone forests (Pham, 1996).

ECOLOGY:
The Ha Tinh langur is a folivorous species. Group sizes range from 5 to 10 individuals (Lippold and Vu, 1994). This is an arboreal and diurnal species. During the daily activity, groups will take a rest at mid-day (Pham et al., 1996/1997). At night, groups will sleep on exposed cliffs (Pham, 1996). Predators of the Ha Tinh langur include humans, Homo sapiens (Pham et al., 1996/1997; Pham, 1996).

LOCOMOTION:
The Ha Tinh langur moves through the forest quadrupedally (Fleagle, 1988).

SOCIAL BEHAVIOR:
The Ha Tinh langur has a unimale social system.

VOCAL COMMUNICATION:

OLFACTORY COMMUNICATION:

VISUAL COMMUNICATION:

TACTILE COMMUNICATION:
social grooming: This is when one individual grooms another and is used to reinforce the bonds between individuals.

REPRODUCTION:
The Ha Tinh langur gives birth to a single offspring.

REFERENCES:
Ankel-Simons, F. 2000. Primate Anatomy. Academic Press: San Diego.

Dao, V.T. 1970. Sur les formes de Semnopitheque noir, Presbytis francoisi (Colobidae, Primates) aus Viet Nam et description d'une forme nouvelle. Mitteil. Zool. Mus. Berlin. Vol. 16, 61-65.

Fleagle, J. G. 1988. Primate Adaptation and Evolution. Academic Press: New York.

Groves, C.P. 2001. Primate Taxonomy. Smithsonian Institute Press: Washington, D.C.

Le, X.C. 1992/1993. Evidence for the existence of Trachypithecus francoisi hatinhensis. Asian Primates. Vol. 2(3-4), 2.

Le, X.C. and Campbell, B. 1993/1994. Population status of Trachypithecus francoisi poliocephalus in Cat Ba National Park. Asian Primates. Vol. 3(3/4), 16-20.

Lippold, L.K. and Vu, N.T. 1994. A new location for Trachypithecus francoisi hatinhensis. Australian Primatology. Vol. 9(2), 13-15.

Pham, N. 1996. Preliminary survey for Hatinh langur (Trachypithecus francoisi hatinhensis Dao) in north central Vietnam. XV IPS/ XIX ASP Abstracts. Madison, WI, USA, 166.

Pham, N., Do, T., and Truong, V.L. 1996/1997. Preliminary survey for Hatinh langur in north central Vietnam. Asian Primates. Vol. 6(3-4), 13-17.

Weitzel, V. and Vu, N.T. 1992. Taxonomy and conservation of Trachypithecus francoisi in Vietnam. Asian Primates. Vol. 2(2), 2-5.

Last Updated: October 24, 2003.
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