Biswamoyopterus biswasi 

Scope: Global
Language: English

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Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Chordata Mammalia Rodentia Sciuridae

Scientific Name: Biswamoyopterus biswasi Saha, 1981
Common Name(s):
English Namdapha Flying Squirrel, Namdapha Giant Flying Squirrel

Assessment Information [top]

Red List Category & Criteria: Critically Endangered B1ab(iii) ver 3.1
Year Published: 2016
Date Assessed: 2016-08-02
Assessor(s): Molur, S.
Reviewer(s): Amori, G.
Facilitator/Compiler(s): Laginha Pinto Correia, D.
The Namdapha Flying Squirrel is assessed as Critically Endangered because its extent of occurrence is estimated to be less than 100 km² based on available habitat in the park and on survey data (Molur et al. 2005), it is known from only one location, and its habitat is continuing to decline.
Previously published Red List assessments:

Geographic Range [top]

Range Description:This species is only known with certainty from a single specimen collected in Namdapha National Park (at altitudes of 100-350 m asl), Tirap District, Arunachal Pradesh, northeastern India (Saha 1981). The surrounding area has been well surveyed but there have been no verified sightings of the species since (Saha pers. comm). It might be restricted to the area of a single valley within the park (Molur et al. 2005).
Countries occurrence:
India (Arunachal Pradesh)
Additional data:
Estimated area of occupancy (AOO) - km2:10-100
Number of Locations:1
Lower elevation limit (metres):100
Upper elevation limit (metres):350
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:This appears to be a rare species, and is thought to have a very small population. Nothing known about population trends. It is known only from the holotype specimen collected in 1981, although informal sightings occurred in 2002 near Halidibari and Deban (Molur et al. 2005).
Current Population Trend:Decreasing
Additional data:
Population severely fragmented:No

Habitat and Ecology [top]

Habitat and Ecology:It is a mostly crepuscular and arboreal species. It occurs in dry deciduous montane forests occupying moist forest tracts along streams (Molur et al. 2005).
Continuing decline in area, extent and/or quality of habitat:Yes

Use and Trade [top]

Use and Trade: Biswamoyopterus biswasi is a local livelihood and it is used as food by humans.

Threats [top]

Major Threat(s): Poaching of animals for food within the park has been observed to be the major threat (Molur et al. 2005). The species appears to have a restricted range, with presumably some general habitat loss and degradation taking place. Additional important threats include habitat loss through landslides and flooding (Molur et al. 2005).

Conservation Actions [top]

Conservation Actions: The species is not protected by any legislation. It is known from Namdapha National Park, Arunachal Pradesh, India (Molur et al. 2005). There is a need to maintain suitable areas of habitat for this species, and to undertake detailed field surveys to determine whether the species still persists and to determine the current distribution range (Molur et al. 2005).

Errata [top]

Errata reason: This errata assessment has been created because the map was accidentally left out of the version published previously.

Citation: Molur, S. 2016. Biswamoyopterus biswasi (errata version published in 2017). The IUCN Red List of Threatened Species 2016: e.T2816A115063959. . Downloaded on 21 September 2018.
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