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Description |
Geographic Range [top]
Range Description: Bornargiolestes nigra is known only from Borneo. Of six known specimens, four are from Sarawak: Mount Dulit in the northeast (Kimmins 1936) and Kubah National Park in the west (Dow 2007). One record is from Brunei (Orr 2001) and the other dates from 1894 from Liang Koeboeng, apparently a location in west Kalimantan (V. Kalkman pers. comm. 2007). There is also a photographic record of a female from Lambir Hills National Park in northeast Sarawak.
Countries occurrence:
Native:
Brunei Darussalam; Indonesia (Kalimantan); Malaysia (Sarawak)
Additional data:
? Lower elevation limit (metres): 100
? Upper elevation limit (metres): 1000
Range Map: Click here to open the map viewer and explore range.
Population [top]
Population: Only six specimens of Bornargiolestes nigra are known. Three of these were isolated individuals, but the other three were collected at one small site at Kubah National Park (Dow 2007), and teneral individuals were observed at the same location; there appears to be a colony at this site. There are also photographic records of females from a different location within Kubah National Park and from Lambir Hills National Park.
Current Population Trend: Unknown
Additional data:
? Population severely fragmented: Unknown
Habitat and Ecology [top]
Habitat and Ecology: The habitat of this species has remained something of a mystery since its description in 1936. The holotype was collected in montane forest at high altitude on Mount Dulit (Kimmins 1936). The female from Brunei was caught by a trail in lowland mixed dipterocarp forest (Orr 2001). We have no precise information on the habitat in which the specimen from Kalimantan was collected. The discovery of a small colony of the species at Kubah may have shed some light on the habitat requirements of this species; all individuals collected or observed were at a small, very wet, cliff in steep terrain in mixed dipterocarp forest. The dense leaf litter at the foot of the cliff was very wet, and there were small water filled ledges on the cliff. It appears at least possible (especially since teneral individuals were observed here) that the species breeds in this location, with the larvae living in the leaf litter or the water filled ledges. Confirmation (or not) of this theory awaits discovery of the larvae, but some supporting evidence is available: Mount Dulit has a long cliff running along much of its length at the altitude where the holotype was collected, there is habitat similar to that at Kubah near where the female from Brunei was collected (A.G. Orr pers. comm. 2007) and the female photographed at Lambir Hills was in very steep terrain, where similar habitat is very likely to be present.
Systems: Freshwater
Threats [top]
Major Threat(s): Habitat loss through clear-cutting of forests is a recognized threat to this species.
Conservation Actions [top]
Conservation Actions: We need more data on this species. Its habitat appears to be rather specialised, but is probably not uncommon on forested hills and mountains in north Borneo, and the species is certainly widely distributed in Sarawak. It may actually be quite common, but under collected because its habitat is freqently remote from the forest streams where most collecting has been carried out, and difficult to access.
Citation: Dow, R.A. 2009. Bornargiolestes nigra. The IUCN Red List of Threatened Species 2009: e.T163824A5656848. http://dx.doi.org/10.2305/IUCN.UK.2009-2.RLTS.T163824A5656848.en. Downloaded on 14 August 2017.
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