This species is reported from much of Peninsular Malaysia, and Yala province to Chumphon, Thailand. It probably occurs more widely than current records suggest, especially in areas between known sites. It is also present on Phuket Island, Thailand. It is found at altitudes between 300 and 1,300m asl.
Habitat and Ecology
It is associated with lowland and montane tropical moist forests. Adults are often encountered in boulder crevices and leaf-litter in streams. Breeding takes place in these streams where the larvae also develop. It has been recorded in selectively logged forest after three years of regrowth.
It appears to be locally common in Peninsular Malaysia, but uncommon in Peninsular Thailand.
It is potentially threatened by clear-cutting of forest habitat. The resulting siltation of forest streams might threaten larval habitat.
The species occurs in a number of protected areas and reserved forests. It is protected by national legislation in Thailand. Further research in into the life history, taxonomy and population size of this species is needed.
This taxon is likely to be a complex of more than one species, and further comparisons of specimens from Peninsular Thailand and Peninsular Malaysia are required. The northernmost opulations of Peninsular Thailand are provisionally attributed to Ansonia malayana (see Inger, 1960), though they might in fact belong to A. siamensis (L. Grismer pers. comm.).
IUCN SSC Amphibian Specialist Group 2014. Ansonia malayana. In: IUCN 2014