This species is known only from the southern slopes of the Nakanai Mountains on the island of New Britain, in the Bismarck Archipelago, Papua New Guinea, at 520-865m asl, in the vicinity of the western end of Jacquinot Bay. It is likely to occur more widely, at least in the Nakanai Mountains.
Habitat and Ecology
This species lives in leaf-litter in primary and old secondary rainforests. It can probably tolerate some habitat alterations, but is unlikely to survive in completely open habitats. It presumably breeds by direct development, without dependence on aquatic habitats.
From the limited information currently available, it appears not to be a common species.
The most obvious threats are forest logging and, if the species occurs more widely on New Britain, permanent conversion of habitat to oil palm plantations (the currently known locality is probably not at risk from this latter threat).
It is not known from any protected areas. Surveys are needed to determine its distribution, ecological requirements and conservation needs.
Fred Kraus 2008. Cornufer sulcatus. In: IUCN 2014