This species is known with certainty only from the Mount Dayman type locality, in Milne Bay Province, in extreme eastern Papua New Guinea. It has also been collected from other localities, but these specimens are not believed to be Nyctimystes daymani. The type locality is at about 700m asl.
Habitat and Ecology
Specimens have been found in rocky streams in forest. If this species is similar to other species in the genus, it presumably lays large eggs in torrential, clear and rocky streams and has larvae which presumably have large suckers.
Its population status is unknown, but this species has probably not been recorded since it was first described.
The major threats to it are unknown.
Given the declines of torrent-dwelling hylids in Australia, the population status of this species requires close monitoring.
Stephen Richards, Richard Zweifel 2004. Nyctimystes daymani. In: IUCN 2014