Ansonia inthanon 

Scope: Global
Language: English

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Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Chordata Amphibia Anura Bufonidae

Scientific Name: Ansonia inthanon Matsui, Nabhitabhata & Panha, 1998
Taxonomic Source(s): Frost, D.R. 2016. Amphibian Species of the World: an Online Reference. Version 6.0 (31 March 2016). New York, USA. Available at:

Assessment Information [top]

Red List Category & Criteria: Least Concern ver 3.1
Year Published: 2017
Date Assessed: 2015-10-12
Assessor(s): IUCN SSC Amphibian Specialist Group
Reviewer(s): Luedtke, J.
Facilitator/Compiler(s): Cutajar, T. & Rowley, J.L.

Listed as Least Concern as this species is relatively widespread with an estimated extent of occurrence (EOO) of 76,381 km2, which consists of 13 threat-defined locations.

Previously published Red List assessments:

Geographic Range [top]

Range Description:This species is known only from 930–1,650 m Asl in Chiang Mai (Matsui et al. 1998) and Kanchanaburi (Chan-ard 2003) Provinces, western Thailand. However, these records are unlikely to represent the actual limits of the species' range as similar habitat and elevations extend between the species' known localities along the western Thai border, as well as into adjacent parts of Myanmar. Further surveys in these areas may uncover its presence there, therefore its range has been projected beyond known sites to include areas of suitable habitat. The species' estimated EOO is 76,381 km2, and its range consists of 13 threat-defined locations.
Countries occurrence:
Additional data:
Number of Locations:13
Lower elevation limit (metres):930
Upper elevation limit (metres):1650
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:Very little is known about the size and trends of this species' population except that it has been collected during several surveys (Matsui et al. 1998, Chan-ard 2003, Daly et al. 2004). The species' population is likely in decline due to habitat loss associated with expanding agriculture throughout parts of its range (Sodhi et al. 2009).
Current Population Trend:Decreasing
Additional data:

Habitat and Ecology [top]

Habitat and Ecology:This species is associated with riparian vegetation along swiftly flowing montane streams (Matsui et al. 1998). During the day it has been observed hiding under a fallen tree (Matsui et al. 1998). Little is known about its life history, however it is presumably oviparous and has an aquatic, free-living larval stage as do other Ansonia for which the reproductive strategy is known. The quality of this species' habitat is declining due to the effects of expanding agriculture (Sodhi et al. 2009).
Systems:Terrestrial; Freshwater
Continuing decline in area, extent and/or quality of habitat:Yes
Movement patterns:Not a Migrant

Use and Trade [top]

Use and Trade: This species has been collected for use in medical research (Daly et al. 2004).

Threats [top]

Major Threat(s): Forest loss is ongoing throughout Thailand, with natural forest often being replaced with palm oil plantations (Sodhi et al. 2009). Recent satellite imagery shows areas of land cleared for agriculture scattered throughout this species' range. The American bullfrog (Lithobates catesbeianus) has been introduced to this region (Khonsue and Thirakhupt 2001) and may represent a threat to this species. The species has been collected for use in medical research (Daly et al. 2004), but this is unlikely to have had any effect on its population.

Conservation Actions [top]

Conservation Actions: Conservation Actions
This species is known from Doi Inthanon (Matsui et al. 1998) and Thong Pha Phum National Parks (Chan-ard 2003). Its predicted range occupies a large network of other protected areas, so it is probably also protected elsewhere.

Conservation Needed
Addressing the lack of data is the first step towards ensuring the species' long-term persistence.

Research Needed
Further research on its range, threats, life history and abundance would inform conservation decisions.

Citation: IUCN SSC Amphibian Specialist Group. 2017. Ansonia inthanon. The IUCN Red List of Threatened Species 2017: e.T54470A84833347. . Downloaded on 26 September 2018.
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