Vietnam Primate Conservation Status Review 2002 - Hoang Lien ...

Distribution in Vietnam
3.2 HATINH LANGUR - Trachypithecus laotum hatinhensis
Le Xuan Canh (1993) photographed a typical Hatinh langur in June 1992 in Phong Nha village. Until
then, the Hatinh langur was only known from its type specimens. Since then, a number of records
have increased our knowledge about the distribution of this taxon.
The only confirmed current occurrence are in the Phong Nha-Ke Bang National Park and Tuyen Hoa
District (Quang Binh Province). There is no evidence of its occurrence in Ha Tinh Province and no
data are available for Quang Tri Province.
The only sighting of an all-black langur which could be related to the animals observed in Hin Namno
NBCA, was made during the survey carried out by FFI from July to September 1998 in Phong Nha-
Ke Bang National Park (Nguyen Xuan Dang et al., 1998). At least one individual of a group living in
Thung Ba Dau (17 O 36’N / 106 O 17’E) was observed twice by the team in July 1998 at the same
sleeping site. This form was reported in interviews with local people throughout the area
The record of all-black langurs in Phong Nha-Ke Bang area by an FFI team in 1998 was not previously
documented. This suggests that earlier records should be reviewed to determine which form was
identified. However, it is unlikely that pelage features were carefully checked during each sighting.
Furthermore, it seems that data from some sightings are still unpublished (Timmins et al., 1999).
3.2.4 Hatinh langur records in Vietnam
Phong Nha-Ke Bang National Park (QUANG BINH)
Special use forest: National park
Hatinh langur status: Occurrence confirmed, last evidence in 2003 (Nadler, pers. comm., 2003)
In June 1992, Le Xuan Canh photographed a single adult male collected alive by a local hunter in
Phong Nha village, Bo Trach District (Le Xuan Canh, 1993). This was the first evidence of the existence
of this subspecies since description of the species by Dao Van Tien (1970). In 1994, one juvenile
female was taken to Xuan Mai Forestry College from Minh Hoa market (skin preserved in FCXM,
unnumbered).
Between 1993 and 1998 the EPRC received 16 Hatinh langurs mostly confiscated from the animal trade
in Quang Binh province and most probably caught in the Phong Nha-Khe Bang area (Nadler, 2000).
During June and July 1994, a survey for endemic pheasants was conducted by NWF, IUCN, WWF
and BirdLife (Lambert et al., 1994). One group of langurs was observed, sleeping every night on a
limestone cliff. The animals were not clearly identified as Hatinh or Black langurs. Local people
reported that langurs were widely distributed throughout the area.
In 1995 and 1996, three surveys were carried out in Thuong Hoa area (Minh Hoa District) and in
Phong Nha area (Bo Trach District) by Pham Nhat et al. (1996a) with a special emphasis on the
Hatinh langur. Five groups were observed in June and July 1995, four in November 1995 and three
in June 1996. In addition, the species was reported, based on interviews, in Hoa Son, Minh Hoa
District and an old sleeping site was checked by the team.
In March 1998, between 10 and 20 langurs were seen from road No. 561 to the south of Cha Lo Village at
a sleeping site but not clearly identified as Hatinh langurs (Sterling in lit. cited by Timmins et al., 1999)
Field surveys were conducted from July to October 1998 by FFI (Timmins et al., 1999). Several groups
of Hatinh langurs were observed, with the number of animals varying between 4 and 8 animals. In July
1998, one group was detected in a sleeping site in Hung Ba Dau (ca. 17 O 36’N / 106 O 17’E), though the
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