Moominia willii 


Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Mollusca Gastropoda Littorinimorpha Hydrobiidae

Scientific Name: Moominia willii
Species Authority: Gerlach, 2003

Assessment Information [top]

Red List Category & Criteria: Endangered B1ab(iii)+2ab(iii) ver 3.1
Year Published: 2009
Date Assessed: 2006-01-11
Assessor(s): Gerlach, J.
Reviewer(s): Miller, R.M., Pollock, C.M. & Seddon, M.B.
The species has a highly restricted distribution, occupying an area of only 0.02 km². It's AOO is thus estimated at 0.02 km², and it's EOO is 5 km². It is found in 2 locations. The principle threat is problematic native species, which cause an ongoing decline in the quality of the habitat. Fortunately, this decline has not extended to the populations, which to date remain stable.

Geographic Range [top]

Range Description: Endemic to Seychelles, this snail is found only on Silhouette island, where it is restricted to two locations spanning an area of 0.02 km² (area of occupancy, AOO, is 0.02 km²). Its extent of occurence (EOO) is 5 km².
Countries occurrence:
Seychelles (Seychelles (main island group))
Estimated area of occupancy (AOO) - km2: .02
Continuing decline in area of occupancy (AOO): No
Extreme fluctuations in area of occupancy (AOO): No
Estimated extent of occurrence (EOO) - km2: 5
Continuing decline in extent of occurrence (EOO): No
Extreme fluctuations in extent of occurrence (EOO): No
Number of Locations: 2
Continuing decline in number of locations: No
Extreme fluctuations in the number of locations: No
Lower elevation limit (metres): 500
Upper elevation limit (metres): 600
Range Map: Click here to open the map viewer and explore range.

Population [top]

Population: The population has been estimated to contain 5000 individuals.
Current Population Trend: Stable
Additional data:
Number of mature individuals: 5000 Continuing decline of mature individuals: No
Extreme fluctuations: No Population severely fragmented: No

Habitat and Ecology [top]

Habitat and Ecology: An arboreal species, this snail is found in the axils of the Vulnerable plant Pandanus hornei. It inhabits forests from 500-600 m.
Systems: Terrestrial
Continuing decline in area, extent and/or quality of habitat: Yes

Threats [top]

Major Threat(s): Problematic native species are currently the main threat to this species, as they cause ecosystem degradation throughout this species' habitat. The species was recently highly threatened by a road development proposal, which would have destroyed all the species' habitat. Fortunately this development proposal was halted, so this is no longer an imminent threat.

Conservation Actions [top]

Conservation Actions: No conservation actions have been taken. Protection of Silhouette island is needed to secure the habitat. Further research is required into the biology and ecology of the species.

Citation: Gerlach, J. 2009. Moominia willii. The IUCN Red List of Threatened Species 2009: e.T168103A6449734. . Downloaded on 01 December 2015.
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