Pilula mahesiana 

Scope: Global
Language: English

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Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Mollusca Gastropoda Stylommatophora Charopidae

Scientific Name: Pilula mahesiana (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.
The species has a very restricted range, with an EOO of 300 km² and an AOO of just 7 km². It is found in 2 locations. Habitat deterioration is ongoing throughout its range, caused by invasive exotic species (e.g., Cinnamomum verum). Fortunately, populations are currently stable and it appears tolerant of current levels of habitat degradation.

Geographic Range [top]

Range Description:This snail is endemic to the Seychelles, and is found on Mahé and Silhouette islands. Its extent of occurrence (EOO) is estimated to be 300 km² and its area of occupancy (AOO) is estimated to be 7 km².
Countries occurrence:
Seychelles (Seychelles (main island group))
Additional data:
Estimated area of occupancy (AOO) - km2:7Continuing decline in area of occupancy (AOO):No
Extreme fluctuations in area of occupancy (AOO):NoEstimated extent of occurrence (EOO) - km2:300
Continuing decline in extent of occurrence (EOO):NoExtreme fluctuations in extent of occurrence (EOO):No
Number of Locations:2Continuing decline in number of locations:No
Extreme fluctuations in the number of locations:NoLower elevation limit (metres):600
Upper elevation limit (metres):990
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:In 2005, the population was estimated to contain 3,200 individuals.
Current Population Trend:Unknown
Additional data:
Number of mature individuals:3200Continuing decline of mature individuals:No
Extreme fluctuations:NoPopulation severely fragmented:No

Habitat and Ecology [top]

Habitat and Ecology:This snail has specific habitat requirements, being restricted to mist forest species. It is found from 600-990 m a.s.l.
Continuing decline in area, extent and/or quality of habitat:Yes

Threats [top]

Major Threat(s): It is vulnerable to habitat degradation, currently caused by invasive exotic species (e.g., Cinnamomum verum). Climate change also poses a potential threat. Small-scale farming caused habitat degradation in the past.

Conservation Actions [top]

Conservation Actions: This species is present in Morne Seychellois National Park. Its range on Silhouette island should also be protected, and invasive species must be controlled throughout the Seychelles. Research into this snail's population status, life history and ecology is needed.

Citation: Gerlach, J. 2009. Pilula mahesiana. The IUCN Red List of Threatened Species 2009: e.T168128A6456011. . Downloaded on 22 January 2018.
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