From the IUCN Red List Species Account:

Range Description

This species is known only from a tiny area on the island of Sumatra, Indonesia, from an unspecified type locality. It is apparently confined to Lubuk Selasi, at the head of the Terusan River at about 1,000 m asl, on the borders of three districts, Padang Pariaman, Solok and Pesisir Selatan, in West Sumatra Province (Teynie et al. 2010). Despite searches, it has not been found above 1,260 m asl, or below 800 m asl. Surveys in several other parts of Sumatra have failed to find this species, and it is likely to have a very restricted distribution.

Habitat and Ecology

Since the identity of the specimens in the rediscovery are uncertain, the following habitat and ecological information should be interpreted with caution (D. Iskandar pers. comm. May 2017). It has been found along a small, clear stream with a width of 15 m in secondary forest. No evidence of breeding has been found, but it presumably breeds by larval development in streams. It is not known whether or not the species is dependent on forest, though this is likely.

Population

This species was described based on a single individual and had not been observed until it was rediscovered in high abundance in 2001 after a gap of 141 years. This rediscovery, however, needs to be re-evaluated to confirm the taxonomic placement of these specimens (D. Iskandar pers. comm. May 2017). 

Population Trend

decreasing

Major Threats

Since its rediscovery, there has been extensive and very rapid habitat destruction for rice paddies in its only known locality, leading to the siltation of streams, which might affect its ability to breed.

Conservation Actions

Conservation Actions
The species is not known from any protected area (it has not been recorded from a conservation forest about 10 km from the only known locality). 

Conservation Needed
A community-based initiative involving local NGOs and communities is urgently needed to save what is thought to be the only known subpopulation of this species.

Research Needed
Research is needed to resolve the taxonomy of this species. Further survey work is necessary to establish the limits of this species' range and population status, and more information is needed on its ecology and threats.

Red List Status

Critically Endangered (CR)

Rationale

Listed as Data Deficient because there is too much uncertainty around the taxonomic status of this species.

Taxonomic Notes

This rediscovery of this species in 2001 needs to be re-evaluated to confirm the taxonomic placement of these specimens (D. Iskandar pers. comm. May 2017).

Citation

IUCN SSC Amphibian Specialist Group 2018. Duttaphrynus sumatranus. The IUCN Red List of Threatened Species 2018: e.T54770A114917254. http://dx.doi.org/10.2305/IUCN.UK.2018-1.RLTS.T54770A114917254.en .Downloaded on 20 February 2019