This species is known from the Kokoda and Garaina areas between 400 and 700 m asl, and from the western slope of Mount Obree at 900 m asl, in eastern Papua New Guinea. It is expected to occur in the 130 km gap between the Kokoda and Garaina areas.
Habitat and Ecology
It occurs along moderate-sized (approximately 3-8 m wide) streams in tropical rainforest. If it is similar to other members of the genus, it lays eggs in streams where the tadpoles also develop. On Mount Obree it has been recorded from secondary forest.
It has been found to be reasonably common, but is not abundant in the Kokoda and Garaina areas, and is common at Mount Obree.
There are no known threats. It can tolerate living in disturbed areas near villages. Extensive habitat exists throughout its range.
Its distribution, habitat requirements and abundance need to be properly documented. Given declines of torrent-dwelling hylids in Australia, monitoring programmes should be initiated. It is not known from any protected areas.
Stephen Richards, Richard Zweifel, Fred Kraus 2015. Nyctimystes semipalmatus. In: IUCN 2014