It is known from east of the main ridge of the Wondiwoi Mountains at the base of the Wandammen Peninsula, in the Papua province.

[3] Similar frogs have been collected from the Yapen island and the Fakfak Mountains, but it remains to be ascertained that these represent the same species.

The specific name sibilans refers to the whistling advertisement call of the species.

Dorsum is greyish or brownish with darker and lighter spots.

[2] The species' natural habitat is tropical moist lowland forests at elevations of 450–800 m (1,480–2,620 ft) asl.