This species is known from a number of localities on Borneo. It is also present at two localities in Peninsular Malaysia, and at a single site in Sumatra (Indonesia). It has been recorded from lowland altitudes of 50-700m asl.
Habitat and Ecology
Adults disperse widely over the floor and herb stratum of primary rainforest. It breeds explosively in small, clear, rocky-bottomed streams, and larvae are most common in shallow side pools and in submerged masses of dead leaves. It is unable to adapt to modified habitats.
It is abundant at a number of sites.
The major threat to the species is deforestation and the resultant siltation of larval habitats.
This species is present in several protected areas, and the continued preservation of large areas of rainforest is needed.
Red List Status
Near Threatened (NT)
Listed as Near Threatened since although this species is still relatively widely distributed, it depends on streams in areas of undisturbed forest habitat, and so its Area of Occupancy is probably not much greater than 2,000 km2, and the extent and quality of its habitat is declining very rapidly due to widespread forest loss within its range, thus making the species close to qualifying for Vulnerable.
A taxonomic review of this species is urgently required, since it almost certainly comprises more than one species.
Robert Inger, Peter Paul van Dijk, Robert Stuebing 2004. Ansonia leptopus. The IUCN Red List of Threatened Species 2004: e.T164781A115304991. http://dx.doi.org/10.2305/IUCN.UK.2004.RLTS.T164781A5925522.en