Nesokaliella intermedia 

Scope: Global
Language: English

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Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Mollusca Gastropoda Stylommatophora Gastrodontidae

Scientific Name: Nesokaliella intermedia Gerlach, 2001
Taxonomic Notes: This genus has not been formally assigned to a family; it has been tentatively placed in the family Gastrodontidae.

Assessment Information [top]

Red List Category & Criteria: Vulnerable B1ab(iii)+2ab(iii); D2 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.
This species has a very restricted range (EOO and AOO = 3 km²; 10 locations), and is currently threatened by habitat degradation throughout this range, caused by invasive non-native plants. Fortunately, to date its population is stable and it appears to be tolerant of current levels of habitat degradation.

Geographic Range [top]

Range Description:Restricted to the Seychelles, this snail is only found on Silhouette island. Its estimated extent of occurrence (EOO) and area of occupancy (AOO) are both 3 km².
Countries occurrence:
Seychelles (Seychelles (main island group))
Additional data:
Estimated area of occupancy (AOO) - km2:3Continuing decline in area of occupancy (AOO):No
Extreme fluctuations in area of occupancy (AOO):NoEstimated extent of occurrence (EOO) - km2:3
Continuing decline in extent of occurrence (EOO):NoExtreme fluctuations in extent of occurrence (EOO):No
Number of Locations:10Continuing decline in number of locations:No
Extreme fluctuations in the number of locations:NoLower elevation limit (metres):350
Upper elevation limit (metres):770
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:The population was estimated at 44,000 in 2005.
Current Population Trend:Stable
Additional data:
Number of mature individuals:44000Continuing decline of mature individuals:No
Extreme fluctuations:NoPopulation severely fragmented:No

Habitat and Ecology [top]

Habitat and Ecology:This is an arboreal species found in high forest, from 350-770 m.
Continuing decline in area, extent and/or quality of habitat:Yes

Threats [top]

Major Threat(s): Currently, this snail is threatened by habitat degradation across its range, caused by invasive non-native species (e.g., Cinnamomum verum). In the past, large-scale farming was a cause of habitat degradation.

Conservation Actions [top]

Conservation Actions: No conservation measures are currently in place. The forests of Silhouette should receive legal protection, and invasive non-native species must be controlled. Research is also needed into the species' biology and ecology.

Citation: Gerlach, J. 2009. Nesokaliella intermedia. The IUCN Red List of Threatened Species 2009: e.T168163A6461549. . Downloaded on 19 January 2018.
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