Discovery and description of a mysterious Asian flying squirrel (Rodentia, Sciuridae, ) from Mount Gaoligong, southwest China.

The flying squirrels of the tribe Pteromyini (Family Sciuridae) currently include 15 genera of which the genus comprises two recognized species, Saha, 1981 and Sanamxay et al., 2013. These two species were each described from only one specimen that are separated from each other by 1,250 kilometres in southern Asia, where they occur in northeast India and central Lao PDR respectively. In 2017 and 2018, two specimens of were discovered from Mount Gaoligong, west Yunnan province, southwest China (between the type locality of the two recognized species). This study aimed to evaluate the taxonomic status of these two newly acquired specimens of by comparing their morphology with the two described species of the genus. The results of this study showed that the specimens from Yunnan province (China) differed from both and in both pelage colour and craniology, and should be recognised as a distinct species, , which is formally described here. This study contributes to the understanding of the flying squirrels of southern Asia and identifies an additional species that appears to be endemic to southwest China; however, more research is required to provide details of its ecology, distribution, and conservation status.