Imperturbatia violescens 

Scope: Global
Language: English

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Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Mollusca Gastropoda Stylommatophora Streptaxidae

Scientific Name: Imperturbatia violescens (Martens, 1898)

Assessment Information [top]

Red List Category & Criteria: Endangered B1ab(iii)+2ab(iii) 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.
Although this species has a stable population, it has a restricted range (extent of occurrence = 70 km² and area of occupancy = 6 km²), and is known from only three locations. Habitat degradation is currently ongoing, as a result of non-native plant species which have invaded this species' habitat.
Previously published Red List assessments:

Geographic Range [top]

Range Description:Endemic to Seychelles, this species is found only on Mahé island. It has an estimated extent of occurrence (EOO) of 70 km² and an area of occupancy (AOO) of 6 km².
Countries occurrence:
Seychelles (Seychelles (main island group))
Additional data:
Estimated area of occupancy (AOO) - km2:6Continuing decline in area of occupancy (AOO):No
Extreme fluctuations in area of occupancy (AOO):NoEstimated extent of occurrence (EOO) - km2:70
Continuing decline in extent of occurrence (EOO):NoExtreme fluctuations in extent of occurrence (EOO):No
Number of Locations:3Continuing decline in number of locations:No
Extreme fluctuations in the number of locations:NoLower elevation limit (metres):450
Upper elevation limit (metres):700
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:In 2005, the population was estimated at 23,500 individuals.
Current Population Trend:Stable
Additional data:
Number of mature individuals:23500Continuing decline of mature individuals:No
Extreme fluctuations:NoPopulation severely fragmented:No

Habitat and Ecology [top]

Habitat and Ecology:This snail inhabits high altitude forest, from 450-700 m.
Continuing decline in area, extent and/or quality of habitat:Yes

Threats [top]

Major Threat(s): The main threat to this species is habitat degradation, caused by invasive non-native species (e.g., Cinnamomum verum) which impact this snail's habitat. Small-scale wood plantations caused habitat deterioration in the past.

Conservation Actions [top]

Conservation Actions: No conservation measures are in place. The area of La Reserve-Brullee should receive legal protection, and invasive species must be controlled.

Citation: Gerlach, J. 2009. Imperturbatia violescens. The IUCN Red List of Threatened Species 2009: e.T10809A3218516. . Downloaded on 22 January 2018.
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