Sooglossus sechellensis 

Scope: Global
Language: English

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Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Chordata Amphibia Anura Sooglossidae

Scientific Name: Sooglossus sechellensis (Boettger, 1896)
Common Name(s):
English Seychelles Frog
Arthroleptis sechellensis Boettger, 1896
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:

Assessment Information [top]

Red List Category & Criteria: Endangered B1ab(ii,iii,v)+2ab(ii,iii,v) ver 3.1
Year Published: 2013
Date Assessed: 2012-04-10
Assessor(s): IUCN SSC Amphibian Specialist Group,
Reviewer(s): Catenazzi, A.
Contributor(s): Gerlach, J. & Nussbaum, R.
Facilitator/Compiler(s): Angulo, A.
Listed as Endangered given that its extent of occurrence (EOO) is estimated to be 1,114 km2, its area of occupancy (AOO) is estimated at 29 km2, it is known from four threat-defined locations, its population is considered to be severely fragmented, and there is a continuing decline in the number of mature individuals, its area of occupancy and quality of its habitat due to projected changes in rainfall patterns in the Seychelles.
Previously published Red List assessments:

Geographic Range [top]

Range Description:This species occurs on the islands of Mahé, Silhouette and Praslin in the Seychelles, from 150-991 m asl (J. Gerlach pers. comm. March 2012). Its extent of occurrence (EOO) is estimated to be 1,114 km2 while its area of occupancy (AOO) is estimated at 29 km2 based on area polygons for occupied habitat for each mapped subpopulation (J. Gerlach pers. comm. March 2012). It is known from four threat-defined locations: one location in Silhouette comprising one subpopulation, one on Praslin, and two locations in Mahé comprising four subpopulations; of these two locations one is at higher elevations (two subpopulations) and the second one at lower elevations (two subpopulations) (J. Gerlach pers. comm. March 2012).
Countries occurrence:
Additional data:
Estimated area of occupancy (AOO) - km2:28.6Continuing decline in area of occupancy (AOO):Yes
Estimated extent of occurrence (EOO) - km2:1114
Number of Locations:4
Lower elevation limit (metres):150
Upper elevation limit (metres):991
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:It is a locally common species, living at densities of 667-2,000 animals per hectare. Population monitoring from 1994-2010 recorded declines in population density in lower altitude sites of over 25% over 16 years, while high altitude sites retained stable populations over this time (Gerlach 2011; J. Gerlach pers. comm. March 2012). The global population is considered to be severely fragmented i.e., it occurs in fragmented habitat patches, the species has poor dispersal ability, such that it is not possible for animals to move between fragments, and it is believed that 50% or more of its individuals occur in isolated and fragmented habitat patches (J. Gerlach pers. comm. March 2012).
Current Population Trend:Decreasing
Additional data:
Continuing decline of mature individuals:Yes
Population severely fragmented:Yes

Habitat and Ecology [top]

Habitat and Ecology:It lives on the forest floor in leaf-litter in both relatively pristine and disturbed rainforest. It is restricted to very damp sites and is found at higher altitudes, which are relatively stable climatically (Gerlach 2011). Lower altitude sites are considered to be marginally suitable for this species due to climatic instability, and they are strongly affected by decreases in rainfall (Gerlach 2011). This frog lays its eggs on land and guards them until they hatch. The tadpoles then wriggle onto their parent's back (although it is not clear whether or not it is the male or the female that carries the larvae).
Continuing decline in area, extent and/or quality of habitat:Yes

Use and Trade [top]

Use and Trade: There are no reports of this species being utilized.

Threats [top]

Major Threat(s): The main threats are habitat degradation and climate change. Habitat is deteriorating mainly due to increased fire and invasive species, principally the tree Cinnamomum verum, and Praslin island and some sites on Mahé are at risk from the impacts of the invasive crazy ant Anoplolepis gracilipes (J. Gerlach pers. comm. March 2012). S. sechellensis is not thought to be seriously threatened by habitat factors since it is somewhat adaptable to secondary habitats (J. Gerlach pers. comm. March 2012). However, since 2006 population declines have been recorded in lower altitude sites associated with changes in rainfall patterns, and climate change is projected to lead to a 10% decline in area of occupancy within 10 years, and a decline of 60% by 2100 (Gerlach 2011; J. Gerlach pers. comm. March 2012).

Conservation Actions [top]

Conservation Actions: It occurs in the Morne Seychellois, Silhouette and Praslin National Parks (J. Gerlach pers. comm. March 2012). There is a need for close monitoring of the population status of this species; this was initiated in 1996 but was forcibly terminated in 2011 (J. Gerlach pers. comm. March 2012). Captive colonies have been successfully maintained, although successful captive breeding has yet to be recorded for this species (J. Gerlach pers. comm. March 2012). The development of captive breeding techniques is recommended for this species, as well as improved habitat management to minimize the impact of invasive species (J. Gerlach pers. comm. March 2012).

Citation: IUCN SSC Amphibian Specialist Group,. 2013. Sooglossus sechellensis. The IUCN Red List of Threatened Species 2013: e.T20381A15446818. . Downloaded on 21 September 2018.
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