Edentulina dussumieri 

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Language: English

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Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Mollusca Gastropoda Stylommatophora Streptaxidae

Scientific Name: Edentulina dussumieri (Dufo, 1840)
Taxonomic Notes: Four subspecies are recognised:

Edentulina dussumieri dussumieri (Dufo, 1840)
Edentulina dussumieri reservae Gerlach & Bruggen, 1999
Edentulina dussumieri silhouettae Gerlach & Bruggen, 1999
Edentulina dussumieri praslina Gerlach & Bruggen, 1999

Assessment Information [top]

Red List Category & Criteria: Least Concern ver 3.1
Year Published: 2009
Date Assessed: 2006-01-11
Needs updating
Assessor(s): Gerlach, J.
Reviewer(s): Miller, R.M., Pollock, C.M. & Seddon, M.B.
This species is considered of Least Concern because it is a widespread species within its limited range (AOO greater than 20 km²), and the effects of invasive species on the populations currently appear to be negligible. Subspecies E. d. praslina and E. d. reservae may be considered Vulnerable (VU D2) on the basis of restricted range (AOO = 7 km² and 1 km², respectively) combined with the threat of invasive species, which may have greater effects in the future.

Geographic Range [top]

Range Description:This species is endemic to the Seychelles islands. Its total extent of occurrence is estimated to be 600 km² and its area of occupancy (AOO) is 47 km². It is found from 100-900 metres above sea level. The four subspecies are distributed on three different islands within the Seychelles:

E. d. dussumieri - northern Mahé island (AOO = 20 km²)
E. d. reservae - southern Mahé island (AOO = 1 km²)
E. d. silhouettae - Silhouette island (AOO = 19 km²)
E. d. praslina - Praslin island (AOO = 7 km²)

There are pre-1800 sub-fossil records of this species on La Digue, although it is now extinct on the island.
Countries occurrence:
Seychelles (Seychelles (main island group))
Additional data:
Estimated area of occupancy (AOO) - km2:47Continuing decline in area of occupancy (AOO):No
Extreme fluctuations in area of occupancy (AOO):NoEstimated extent of occurrence (EOO) - km2:600
Continuing decline in extent of occurrence (EOO):NoExtreme fluctuations in extent of occurrence (EOO):No
Continuing decline in number of locations:No
Extreme fluctuations in the number of locations:NoLower elevation limit (metres):100
Upper elevation limit (metres):900
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:In 2005, the population was estimated to be over 2 million individuals. The estimated populations of each subspecies are:

E. d. dussumieri - 2,005,000 individuals
E. d. reservae - 1,000 individuals
E. d. silhouettae - 112,400 individuals
E. d. praslina:  - 31,500 individuals
Current Population Trend:Stable
Additional data:
Number of mature individuals:2149900Continuing decline of mature individuals:No
Extreme fluctuations:NoPopulation severely fragmented:No

Habitat and Ecology [top]

Habitat and Ecology:A predatory species feeding on medium-sized snails, this snail inhabits mid- to high-altitude forest.
Continuing decline in area, extent and/or quality of habitat:Yes

Threats [top]

Major Threat(s): This species is threatened by habitat deterioration, which was caused in the past by small-scale farming and large-scale wood plantations, and is currently caused by invasive exotic species (e.g., Cinnamomum verum) that alter the habitat. However, to date any population declines appear to be negligible.

Conservation Actions [top]

Conservation Actions: Two subspecies are present in protected areas: E. d. dussumieri in Morne Seychellois National Park and E. d. praslina in Praslin National Park. Legal protection is required for the La Reserve-Brullee area of Mahé island (to protect E. d. reservae) and Silhouette island (to protect E. d. silhouettae). Invasive species must be controlled.

Citation: Gerlach, J. 2009. Edentulina dussumieri. The IUCN Red List of Threatened Species 2009: e.T168143A6459219. . Downloaded on 22 January 2018.
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