This species is currently known from between 1,950-2,000 m asl on Ngoc Linh Mountain within Ngoc Linh Nature Reserve, Dak Glei District, Kon Tum Province, Viet Nam (Rowley et al. 2011). Ngoc Linh is an isolated high elevation area and much of the fauna here is thought to be endemic (Abramov et al. 2006). The species is therefore likely to be restricted to this area (Rowley et al. 2011). However further surveys may expand its range to adjacent areas of similar habitat and elevation outside of the reserve. The species' extent of occurrence (EOO) is 940 km2, which represents a single threat-defined location.
Habitat and Ecology
This species inhabits high-elevation montane evergreen and bamboo forest where the environment is very wet, with high rainfall and humidity. Tadpoles have been observed in a clutch of eight inside a small water-filled tree hollow about 1 m above the ground (Rowley et al. 2011). The area and quality of this species' habitat outside of protected areas are undergoing decline due to the effects of agriculture (Meyfroidt and Lambin 2008, Meyfroidt et al. 2013).
Only one adult female and eight larvae of this species have been recorded. This is likely a reflection of the species' arboreal nature, small size and cryptic colouration, as well as limited surveys in the area (Rowley et al. 2011). No information on the species' population size or trends are known, however habitat loss is likely causing the population to decrease within parts of its range.
Habitat loss and degradation, particularly as a result of the conversion of forest to agricultural land to grow cash crop plantations (e.g. rubber, coffee and tea), is an ongoing threat throughout the Central Highlands (Meyfroidt & Lambin, 2008; Meyfroidt et al. 2013). This species is likely to be threatened by habitat loss in parts of its range that extend outside of well-protected areas (Rowley et al. 2011).
This species is known to occur within Ngoc Linh Nature Reserve.
Addressing the lack of data is the first step towards ensuring its survival - research on the species' population trends, life history, and threats would help to inform conservation decisions.
Red List Status
Listed as Endangered as this species' extent of occurrence (EOO) is only 940 km2 and represents only one threat-defined location, and there is continuing decline in the quality and extent of its habitat.
IUCN SSC Amphibian Specialist Group 2016. Theloderma nebulosum. The IUCN Red List of Threatened Species 2016: e.T48100370A48100376. http://dx.doi.org/10.2305/IUCN.UK.2016-1.RLTS.T48100370A48100376.en .Downloaded on 23 January 2019