August 06, 2013
In September 2012, a team from the National University of Laos surveyed markets in central Lao PDR for squirrels. In one of the many small markets, Master’s student Daosavanh Sanamxay found something remarkable, a single specimen of a flying squirrel previously undescribed to science. The researchers described this newly discovered species in a 2013 Zootaxa publication, giving it the English name: the Laotian giant flying squirrel (Biswamoyopterus laoensis).
The Laotian giant flying squirrel is only the second record of the genus, Biswamoyopterus, the first being the Critically Endangered Namdapha flying squirrel (Biswamoyopterus biswasi), known only from a single physical example collected in 1981 in Arunachal Pradesh, India. The new Laotian giant flying squirrel is also the first record of the genus from Southeast Asia.
Underside view of the newly discovered Laotian giant flying squirrel. Photo courtesy of Sanamxay, Daosavanh; et al. Zootaxa 3686 (4): 471–481.
Though the new species does show close affinities to the Namdapha flying squirrel, it is certainly distinct, differing substantially in color of the body, patagia (membrane between limbs of flying mammals), tail membrane, and tail pelage, as well as size.
"We don't know how endangered this species is... during my second survey in the market, I found approximately 10 dead body of this species in the [freezers] of the sellers," Daosavanh Sanamxay, lead author and current master’s student at the National University of Laos, told mongabay.com.
The exact habitat of this new mammal is not known, but the researchers speculate that the habitat is not far from the market where the specimen was found, 5 km Southwest of Nam Kading National Biodiversity Conservation Area (NBCA), a heavily hunted area consisting mostly of pristine dry evergreen forest or semi-evergreen forest and limestone karst formations. Central Lao PDR is characterized by these limestone cliffs and rock formations and is home to other rare endemic rodents including the Kha-nyou (Laonastes aenigmamus), the only member of a rodent group thought to have died out 11 million years ago that was incidently also discovered in a bushmeat market, and the Lao limestone rat (Saxatilomys paulinae).
Portrait of the Namdapha flying squirrel. Found in India, this species is Critically Endangered and has not been seen since 2002. Photo by: Zoological Survey of India/Creative Commons 3.0.
The major threats for the wildlife in Lao PDR are habitat loss and harvesting for food. Squirrels in particular face serious threats. According to the Zootaxa paper "they rank as the most commonly traded mammalian 'bush-meat' in local markets."
To address the conservation of these seemingly rare flying squirrels Sanamxay poses that, “First we must put more effort into surveying not only flying squirrels but also other wildlife in order to estimate the population in nature and compare it with the consumption rate. Moreover, we need to revise the law for wildlife in the country. Most squirrels, especially flying squirrels, are not included in the law.”
Other squirrel species in the market. Photo by: Daosavanh Sanamxay.
Birds and mammals in Laos PDR market. The bushmeat trade, combined with the traditional medicine trade, has been blamed for creating 'empty forests' across parts of Asia where, even though forest still stands, most mammals and birds have been wiped out. Photo by: Daosavanh Sanamxay.
Wild mammals, birds, and butchered meat in a Laos market. Photo by: Daosavanh Sanamxay.
CITATION: Sanamxay, Daosavanh; et al. 15 Jul. 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.
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