It is endemic to Weh Island, located northwest of Sumatra, Indonesia.

[1][3] Known only from the holotype (more correctly, syntypes[3]), its ecology is unknown, but it is assumed to be a lowland forest species.

Practically no forest habitat remains on Weh Island, and it is not known whether the species still persists there.

[1] The specific name valhallae refers to yacht "Valhalla" on which Geoffrey Meade-Waldo was travelling when he encountered the new species.

[2][4] The syntype, two females, measure about 82 mm (3.2 in) in snout–vent length.