Taxon name
Hoolock hoolock
(Harlan, 1834)
Uploaded by
National Red List Database
Taxonomic information
Scientific name
Hoolock hoolock
(Harlan, 1834)
Common name(s)
Hoolock Gibbon, Western Hoolock Gibbon, Ulluk, Bonmanush, Hulu, Huru
Assessed taxon level
Species
Higher level taxonomic groupings
Vertebrates
Mammals
Species authority
(Harlan, 1834)
Taxonomic notes and synonyms listed
This taxon is now considered monotypic; it was formerly considered conspecific with Hoolock leuconedys. The previous generic name, Bunopithecus, was changed by Mootnick and Groves (2005) to Hoolock (Haimoff et al. 1984) (Brockelman et al. 2008).
Simia golock (Bechstein, 1795); Hylobates fuscus (Wilson Lewis, 1834); Simia hoolock (Harlan, 1834); Bunopithecus hoolock hoolock (Harlan, 1834); Hylobates choromandus (Ogilby, 1837); Hylobates scyritus (Ogilby, 1840); Hylobates hoolock (Blanford, 1881-18
Location and scope
Specific locality or subnational name or regional name
Bangladesh
Scope (of the Assessment)
National
Countries included within the scope of the assessment
Does the assessment cover a marine EEZ area(s)?
Not_assigned
Conservation Status
Assessed as
Critically Endangered
Criteria system used
IUCN
(see Assessment details)
Assessment rationale/justification
Population reduction observed around 90% over the last two decades. Both Extent of Occurrence and Area of Occupancy have been reduced during this period. Total number of mature individual is <250 and number of mature individuals in each subpopulation is <50. Population viability assessment (PHVA) estimated 95% reduction of existing population by next two decades. All these occur in severely disjunct habitats having very little or no chance of genetic exchanges between two or more populations. So, this Hoolock Gibbon is assessed as Critically Endangered.
Assessment details
Assessors/contributors/reviewers listed
Mohammed Mostafa Feeroz, Md. Kamrul Hasan, Md. Farid Ahsan
Criteria system used
IUCN
Reference for methods given
IUCN (2012) IUCN Red List Categories and Criteria: Version 3.1. Second edition. Gland, Switzerland and Cambridge, UK: IUCN. iv + 32pp; IUCN (2012) Guidelines for Application of IUCN Red List Criteria at Regional and National Levels: Version 4.0. Gland, Switzerland and Cambridge, UK: IUCN. iii + 41pp.
URL (link) of redlist assessment or publication
http://iucnredlistbd.org/
Further information
Endemism (according to assessment)
Taxon distribution as listed in assessment
Bangladesh, India and Myanmar (Brockelman et al. 2008). It lives in the mixed evergreen forests of northeast and southeast of Bangladesh (Ahsan 1994, Khan 1982, 2015).
Is there a map available in assessment?
Yes, in the publication/on website
Habitat and systems
Ecological system type
Habitat
Habitat details as listed in assessment
Hoolock Gibbon inhabits tropical mixed evergreen forests of the northeast and southeast of the country. It is an arboreal, brachiator, monogamous and territorial species but come down to cross a stretch of land when tree canopies are discontinuous. The family group may comprise of adult male and female with their offsprings. Hoolock gibbon is mainly frugivorous but its diet also comprise of leaves, flowers and twigs (Ahsan 1994, Feeroz 1991, Feeroz and Islam 1992, Khan 1985, 1987b).
History
Critically Endangered in Bangladesh (IUCN Bangladesh 2000).
Publication
IUCN Bangladesh. 2015. Red List of Bangladesh Volume 2: Mammals. IUCN, International Union for Conservation of Nature, Bangladesh Country Office, Dhaka, Bangladesh, pp. xvi+232
