Hyperolius thomensis


Taxonomy [top]

Kingdom Phylum Class Order Family

Scientific Name: Hyperolius thomensis
Species Authority: Bocage, 1886
Taxonomic Notes: This species has previously been assigned to the genus Nesionixalus.

Assessment Information [top]

Red List Category & Criteria: Endangered B1ab(iii) ver 3.1
Year Published: 2004
Date Assessed: 2004-04-30
Needs updating
Assessor(s): Robert Drewes, Arne Schiøtz
Reviewer(s): Global Amphibian Assessment Coordinating Team (Simon Stuart, Janice Chanson and Neil Cox)
Listed as Endangered because its Extent of Occurrence is less than 5,000km2, its range is severely fragmented, and the quality and extent of its forest habitat on São Tomé is declining.

Geographic Range [top]

Range Description: This species is endemic to São Tomé Island in São Tomé and Príncipe. It is restricted to primary forest remnants at elevations usually above 800m asl.
Sao Tomé and Principe
Range Map: Click here to open the map viewer and explore range.

Population [top]

Population: There is little information on the population status of this species, since it is notoriously difficult to find.
Population Trend: Decreasing

Habitat and Ecology [top]

Habitat and Ecology: It is restricted to primary rainforest, and is known to breed by larval development in tree holes. The same tree hole can be utilized by many individuals for breeding at different times. It has previously been reported from towns, but there is now significant doubt about these records.
Systems: Terrestrial; Freshwater

Threats [top]

Major Threat(s): Little information is available on threats, though it is likely to be impacted by habitat loss for agriculture, livestock, wood extraction, and human settlements.

Conservation Actions [top]

Conservation Actions: A large portion of its range falls within the proposed 295km² Parc Naturel Obo.

Bibliography [top]

Drewes, R.C. 2002. Islands at the center of the world. California Wild: 8-19.

Drewes, R.C. and Stoelting, R.E. 2004. The California Academy of Sciences Gulf of Guinea Expedition (2001) II. Additions and corrections to our knowledge of the endemic amphibians of São Tomé and Príncipe. Proceedings of the California Academy of Sciences: 573-587.

Drewes, R.C. and Wilkinson, J.A. 2004. The California Academy of Sciences Gulf of Guinea Expedition (2001): The taxonomic status of the genus Nesionixalus Perret, 1976 (Anura: Hyperoliidae), treefrogs of São Tomé and Príncipe with comments on the genus Hyperolius. Proceedings of the California Academy of Sciences: 395-407.

IUCN. 2004. 2004 IUCN Red List of Threatened Species. Downloaded on 23 November 2004.

Loumont, C. 1992. Les amphibiens de Sao Tome et Principe: revision systematique, cris nuptiaux et caryotypes. Alytes: 37-62.

Perret, J.-L. 1988. Sur quelques genres d'Hyperoliidae (Anura) restes en question. Bulletin de la Société neuchâteloise des Sciences naturelles: 35-48.

Schiøtz, A. 1999. Treefrogs of Africa. Edition Chimaira, Frankfurt am Main.

Citation: Robert Drewes, Arne Schiøtz 2004. Hyperolius thomensis. The IUCN Red List of Threatened Species. Version 2015.2. <>. Downloaded on 28 August 2015.
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