Biswamoyopterus biswasi Saha, 1981:333
Namdapha flying squirrel, Biswas' flying squirrel (proposed)
Taxonomy & Nomenclature
Synonym/s: Biswamoyopterus laoensis Sanamxay et al., 2013
Last record: 1981
IUCN RedList status: Critically Endangered
The Namdapha Flying Squirrel (Biswamoyopterus biswasi) is only known from a single specimen collected in Namdapha National Park, Arunachal Pradesh in 1981. No other specimens have been confirmed as being observed in the wild. However, possible sightings by a birdwatcher from Switzerland have been reported:
"This species is restricted to type locality only in the adjacent slopes of a particular valley and the EoO is less than 100 sq km. It was believed there were no recent sightings until three specimens were seen at Deban and one at Haldibari on 23 and 24 December 2002 by a Swiss birdwatcher in Namdapha (Ritschard, 2003)." (Molur et al. 2005:431)
Whether this report is probably correct or not depends upon both the knowledge of the witness regarding this species, and the possibility of unintentional misidentification of a species of similar enough phenotypic appearance to fool them. Since neither of these variables is known (to the author), the species shall remain in the "missing" species database until confirming evidence of its persistence is found.
Namdapha National Park, Arunachal Pradesh, India
Only known from the holotype.
A photograph of this specimen may be seen here: https://news.mongabay.com/2013/0806-kimbrough-giant-flying-squirrel.html
Original scientific description:
Saha, S. S. (1981). A New Genus and a New Species of Flying Squirrel (Mammalia: Rodentia: Sciuridae) from Northeastern India. Zoological Survey of India 4(3): 331-336.
Alfred, J.R.B., Sinha, N. K. and Chakraborty, S. (2002). Checklist of Mammals of India. Published by Director, Zool. Surv. India, Kolkata. Rec. zool. Surv. India, Occ. Paper. 199: 1-289.
Corbet, G. B. and Hill, J. E. (1992). Mammals of the Indo-Malayan Region: a Systematic Review. Oxford University Press, Oxford, UK.
Li G-G, Lwin YH, Yang B, Qin T, Quan R-C, Li S. (2019). Taxonomic revision and phylogenetic position of the flying squirrel genus Biswamoyopterus (Mammalia, Rodentia, Sciuridae, Pteromyini) on the northern Indo-China peninsula. ZooKeys 872: 77-93.
Li G, Lwin YH, Yang B, Qin T, Phothisath P, Maung K-W, Quan R-C, Li S (2020). Taxonomic revision and phylogenetic position of the flying squirrel genus Biswamoyopterus (Mammalia, Rodentia, Sciuridae, Pteromyini) on the northern Indo-China peninsula. ZooKeys 939: 65-85.
Mishra, C., A. Datta and M.D. Madhusudhan. (2004). The high altitude wildlife of western Arunachal Pradesh: a survey report. DERC Technical report No. 8.
Molur, S. (2008). Biswamoyopterus biswasi. In: IUCN 2011. IUCN Red List of Threatened Species. Version 2011.1. (https://www.iucnredlist.org). Downloaded on 01 October 2011.
Pradhan, M. S. and Talmale, S. S. 2009. List of valid Rodent taxa (Class: Mammalia, Order: Rodentia) from Indian Subcontinent region including Myanmar. Published by the Director, Zool. Surv. India, Kolkata. Rec. zool. Surv. India, Kolkata. 297: 1-239.
Pradhan, M. S. and Talmale, S. S. 2011. A Checklist of valid Indian Rodent Taxa (Mammalia: Rodentia). Published by Zoological Survey of India (Online version: Updated till May, 2011.). 12pp.
Sanamxay, Daosavanh et al. (2013). Rediscovery of Biswamoyopterus (Mammalia: Rodentia: Sciuridae: Pteromyini)
in Asia, with the description of a new species from Lao PDR. Zootaxa 3686 (4): 471-481. [Abstract]
Sanjay Molur, C. Srinivasulu, Bhargavi Srinivasulu, Sally Walker, P.O. Nameer and Latha Ravikumar. (2005). Status of South Asian Non-volant Small Mammals: Conservation Assessment and Management Plan (C.A.M.P.) Workshop Report. Zoo Outreach Organisation / CBSG-South Asia, Coimbatore, India, 618pp.
Ritschard, M. (2003). RFI Namdapha Flying Squirrel. Email message submitted to from locustella @student.unibe.ch, dated Tuesday, August 12, 2003, 2:26PM.
Srinivasulu, C., Chakraborty, S. and Pradhan, M. S. (2004). Checklist of sciurids (Mammalia: Rodentia: Sciuridae) of South Asia. Zoos’ Print Journal 19(2): 1351-1360.
Wilson, D.E. and Reeder, D. M. (eds.). 2005. Mammal Species of the World: A Taxonomic and Geographic Reference- Third Edition Johns Hopkins University Press, Baltimore, MD. 2: 1-2141.