Namdapha flying squirrel

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"Biswamoyopterus" redirects here. For the other member of this genus, see Biswamoyopterus laoensis.
Namdapha flying squirrel
Namdapha flying squirrel.jpg
Conservation status
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Rodentia
Family: Sciuridae
Subfamily: Sciurinae
Tribe: Pteromyini
Genus: Biswamoyopterus
Species: B. biswasi
Binomial name
Biswamoyopterus biswasi
Saha, 1981[2]

The Namdapha flying squirrel (Biswamoyopterus biswasi) is an arboreal, nocturnal flying squirrel endemic to India. It was the sole member in the genus Biswamoyopterus until the description of the Laotian giant flying squirrel (Biswamoyopterus laoensis) in 2013.[3] First collected in Deban (on 27 April 1981), no population estimates are available for B. biswasi, but the known habitat is tall Mesua ferrea jungles, often on hill slopes in the catchment area of Na Dihing river (particularly on the western slope of Patkai range) in North eastern India .[4][5]


B. biswasi has reddish, grizzled fur with white above. Its crown is pale grey, its patagium is orangish and its underparts are white.[4][5]

The cheek teeth of B. biswasi are simple, and its incisors are unpigmented. Septae are multiple in auditory bullae and sometimes honeycomb-shaped with 10 to 12 cells in it.[4][5]

It measures 40.5 cm from head to vent and has 60 cm long tail. The hindfoot is 7.8 cm and the ear is 4.6 cm.[4][5]

The scientific name commemorates Biswamoy Biswas (1923–1994).


It is listed as a critically endangered species due to habitat loss. In addition it is hunted for food, and skins/fur.


  1. ^ Molur, S. (2008). Biswamoyopterus biswasi. In: IUCN 2008. IUCN Red List of Threatened Species. Retrieved 6 January 2009.
  2. ^ Reference for taxonomic information from Don E. Wilson & DeeAnn M. Reeder (Eds.) (2005). Mammal Species of the World - A Taxonomic and Geographic Reference (3rd ed.). 
  3. ^ Sanamxay, Daosavanh; Douangboubpha, Bounsavane; Bumrungsri, Sara; Xayavong, Sysouphanh; Xayaphet, Vilakhan; Satasook, Chutamas; Bates, Paul J.J. (2013). "Rediscovery of Biswamoyopterus (Mammalia: Rodentia: Sciuridae: Pteromyini) in Asia, with the description of a new species from Lao PDR". Zootaxa (Magnolia Press) 3686 (4): 471–481. doi:10.11646/zootaxa.3686.4.5. ISSN 1175-5334. 
  4. ^ a b c d Saha, S. S. (1981). "A new Genus and a new species of flying squirrel (Mammalia: Rodentia: Sciuridae) from northeastern India". Bull. Zool. Surv. India 4 (3): 331–336. 
  5. ^ a b c d Saha, S. S. (1985). "Arunachal Pradesh: A Proposed Biosphere Reserve". Mammalia Rec. Zool. surv. India (Special Issue on Fauna of Namdapha 82 (1–4): 321–330.