This species is known only from Hala Bala Wildlife Sanctuary, Narathiwat Province, Penisular Thailand (Matsui 2006). This may not represent the actual limits of the species' range as similar habitat to that in its known locality extends north into Budo-Sungai Padi National Park and south into extreme-northern Malaysia. Further surveys in these areas may uncover its presence there, therefore its range has been projected beyond known sites to include these areas of suitable habitat. The species' estimated EOO is 339 km2, which consists of four threat-defined locations. The species' elevational range is unknown.
Habitat and Ecology
This species is associated with hilly evergreen forest and has been recorded sitting among rocks 10 m from a stream at night (Matsui 2006). Females of the species have not been observed, nor have eggs or larvae, however oviposition and a free-swimming larval stage is expected, as is the case in all other Leptolalax species for which larvae are known. Recent satellite imagery shows that habitat in parts of the species' predicted range (outside well-protected areas) is disturbed by agriculture.
Nothing is known about the size and trends of this species' population; it is known only from the holotype, which was collected in 1997 (Matsui 2006). Ongoing habitat loss associated with expanding agriculture in parts of the species' range (Sodhi et al. 2009) is likely causing some population declines.
A high rate of forest loss has been identified as a significant threat to biodiversity throughout Thailand and Malaysia, with natural forest being cleared for expanding agriculture (Sodhi et al. 2009). Recent satellite imagery shows some areas of cleared land within this species' predicted range. This likely poses a threat to the species if it does occur in these areas – further surveys are warranted to determine this.
This species is known from Hala Bala Wildife Sanctuary (Matsui 2006) and likely also occurs in Budo-Sungai Padi National Park.
Strategies for additional protection of the species' localities may be warranted if it is detected in more disturbed parts of its projected range, but addressing the lack of data is the first step towards ensuring this species' long-term persistence.
Research should be carried out to determine its distribution, relative abundance, life history and threats.
Red List Status
Listed as Endangered as this species has an estimated extent of occurrence (EOO) of only 339 km2, is expected from four threat-defined locations, and is likely facing a continuing decline in the quality of parts of its habitat.
IUCN SSC Amphibian Specialist Group 2017. Leptolalax solus. The IUCN Red List of Threatened Species 2017: e.T135770A85280115. http://dx.doi.org/10.2305/IUCN.UK.2017-2.RLTS.T135770A85280115.en .Downloaded on 18 January 2019