All confirmed records of this species are from northern, northeastern, western and Peninsular Thailand, northeast India (Assam and Meghalaya) southeastern Bangladesh (Chittagong and Rangamati Hill-district), southern Myanmar and western Lao People's Democratic Republic. It might extend into northern Peninsular Malaysia (P. van Dijk and R. Sukumaran pers. comm.). Altitude records range between 60 and 1,350 m asl.
Habitat and Ecology
It is often found under leaf-litter in evergreen forest in monsoon and rainforest climatic regions, as well as dense mixed deciduous forest. Tadpoles inhabit deep sections of forest streams with little current.
The occurrence of this species can be localized, but where the species occurs adults tend to be fairly common and tadpoles are generally abundant.
While individuals and populations could be affected by forest clearance and other impacts such as stream pollution, drought, and local collection for consumption (northeastern Thailand), these threats are unlikely to threaten its survival in the near future.
Substantial populations are securely protected in National Parks and Wildlife Sanctuaries in Thailand.
This species includes the mainland populations previously referred to as Leptobrachium hasseltii, a taxon now restricted to the Indo-Malayan Archipelago. It also includes previous records of L. pullum in Thailand.
van Dijk, P.P., Chan-ard, T., Dutta, S., Ohler, A., Sengupta, S. & Asmat, G.S.M. 2009. Leptobrachium smithi. In: IUCN 2014