Phrynobatrachus pakenhami 


Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Chordata Amphibia Anura Phrynobatrachidae

Scientific Name: Phrynobatrachus pakenhami
Species Authority: Loveridge, 1941
Common Name(s):
English Pakenham's River Frog
Phrynobatrachus nigripes Pickersgill, 2007
Taxonomic Source(s): Frost, D.R. 2013. Amphibian Species of the World: an Online Reference. Version 5.6 (9 January 2013). Electronic Database. American Museum of Natural History, New York, USA. Available at:
Taxonomic Notes: It has been suggested that this species is a synonym of Phrynobatrachus acridoides, but recent surveys indicate that it differs both in vocalizations and ecology (M. Pickersgill pers. comm.). Phrynobatrachus nigripes, described by Pickersgill (2007), is in fact a synonym of this species (M. Pickersgill pers. comm.).

Assessment Information [top]

Red List Category & Criteria: Endangered B1ab(iii) ver 3.1
Year Published: 2008
Date Assessed: 2008-01-01
Assessor(s): Pickersgill, M. & Howell, K.
Reviewer(s): Stuart, S.N., Chanson, J.S. & Cox, N.A.
Listed as Endangered because, although it can withstand a limited degree of habitat modification, its Extent of Occurrence is less than 5,000 km2, it occurs in fewer than five locations, and the quality and extent of its forest habitat on Pemba is declining.
Previously published Red List assessments:
2004 Endangered (EN)

Geographic Range [top]

Range Description: This species is known only from the northern part of Pemba Island, Tanzania, where it has been recorded from three localities: Machengwe Swamp; Wete; and Ngezi Forest Reserve.
Countries occurrence:
Tanzania, United Republic of
Range Map: Click here to open the map viewer and explore range.

Population [top]

Population: It is a common species in Ngezi Forest Reserve. It is not clear that it survives elsewhere on the island, although intensive surveys have not yet been carried out.
Current Population Trend: Decreasing
Additional data:
Population severely fragmented: No

Habitat and Ecology [top]

Habitat and Ecology: It lives on the forest floor, and in forest fringes and clearings, and has not been found in areas away from the forest. It breeds in pools, marshes, puddles and roadside ditches in and near tropical evergreen lowland forest.
Systems: Terrestrial; Freshwater

Threats [top]

Major Threat(s): It is probably greatly reduced in population size because of the almost complete loss of indigenous broadleaf lowland forest in Pemba, largely for agriculture. There has been widespread introduction of clove trees throughout the island, and it seems not to be present in clove thicket. It is now intrinsically at risk because of the small size of its remaining distribution.

Conservation Actions [top]

Conservation Actions: It occurs in the Ngezi Forest Reserve, which protects the last remaining stand of indigenous rainforest on the island. Continued management and protection of this forest reserve is essential to the long-term survival of this species. Further survey work is needed to determine whether the species still survives elsewhere on Pemba.

Citation: Pickersgill, M. & Howell, K. 2008. Phrynobatrachus pakenhami. The IUCN Red List of Threatened Species 2008: e.T58130A11738192. . Downloaded on 27 November 2015.
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