The Namdapha flying squirrel (Biswamoyopterus biswasi) is an arboreal, nocturnal flying squirrel endemic to Arunachal Pradesh in northeast India, where it is known from a single specimen collected in Namdapha National Park in 1981. No population estimate is 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 northeastern India.