Hyperolius watsonae 

Scope: Global
Language: English

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Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Chordata Amphibia Anura Hyperoliidae

Scientific Name: Hyperolius watsonae Pickersgill, 2007
Taxonomic Source(s): Frost, D.R. 2015. Amphibian Species of the World: an Online Reference. Version 6.0. New York, USA. Available at:

Assessment Information [top]

Red List Category & Criteria: Critically Endangered B1ab(iii)+2ab(iii) ver 3.1
Year Published: 2008
Date Assessed: 2008-01-01
Assessor(s): Martin Pickersgill
Reviewer(s): Simon Stuart, Neil Cox
Listed as Critically Endangered because its extent of occurrence is less than 100 km² and its area of occupancy is less than 10 km², all individuals are in a single location, and there is a continuing decline in the extent and quality of its habitat on the island of Pemba.

Geographic Range [top]

Range Description:This species is endemic to Ngezi Forest, on Pemba Island, in Tanzania. It occurs close to sea-level.
Countries occurrence:
Tanzania, United Republic of
Additional data:
Number of Locations:1
Upper elevation limit (metres):50
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:It appears to be a rare species. Only 10-20 males were heard calling at its only known site.
Current Population Trend:Decreasing
Additional data:
Population severely fragmented:No

Habitat and Ecology [top]

Habitat and Ecology:It appears to be dependent on lowland forest. At its only known site it was found calling in forest trees overhanging a small pool, but it was absent from the grasses and herbage at the other end of the same pool in a more open situation. It presumably breeds in water by larval development.
Systems:Terrestrial; Freshwater

Threats [top]

Major Threat(s): It is restricted to a tiny area where its forest habitat is at risk from harvesting of wood, and small-scale agriculture.

Conservation Actions [top]

Conservation Actions: It occurs in the Ngezi Forest Reserve which requires careful management for this extremely rare species.

Citation: Martin Pickersgill. 2008. Hyperolius watsonae. The IUCN Red List of Threatened Species 2008: e.T135845A4210326. . Downloaded on 23 October 2017.
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