This species has been found at many localities in north-western Borneo, from 65-1,200m asl. It was also recorded once in Lampung, Sumatra, but its distribution here is still questionable. It is likely to occur a little more widely than current records suggest.
Habitat and Ecology
This is a largely aquatic species, most often seen in seepage areas in primary lowland rainforest. Larvae also develop in these thin films of water. This species appears to be unable to adapt to modified habitats.
The population status of this species is unknown.
The major threat is habitat loss due to clear-cutting.
It is present in a number of protected areas in Borneo, and the Sumatran specimens were collected in a protected area. The preservation of lowland tropical moist forest in Borneo is recommended as a conservation measure for this species.
Red List Status
Near Threatened (NT)
Listed as Near Threatened since although this species is still relatively widely distributed, it depends on areas of undisturbed forest habitat, and so its Extent of Occurrence is probably not much greater than 20,000 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 the specimens assigned to this taxon (especially those of Sumatran origin) is recommended.
Robert Inger, Robert Stuebing, Djoko Iskandar, Mumpuni 2004. Occidozyga baluensis. The IUCN Red List of Threatened Species 2004: e.T58406A11774497. http://dx.doi.org/10.2305/IUCN.UK.2004.RLTS.T58406A11774497.en .Downloaded on 21 January 2019