Nesokaliella minuta 


Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Mollusca Gastropoda Stylommatophora Gastrodontidae

Scientific Name: Nesokaliella minuta
Species Authority: Gerlach, 1998
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
Assessor(s): Gerlach, J.
Reviewer(s): Miller, R.M., Pollock, C.M. & Seddon, M.
This species has a very restricted range (EOO and AOO = 5 km²; 10 locations), and is currently threatened by habitat degradation throughout this range, caused by invasive non-native plants. Current population levels are stable despite high levels of invasion by alien plant species.

Geographic Range [top]

Range Description: This species is restricted to the northern part of Mahé island in the Seychelles. Its extent of occurrence (EOO) and area of occupancy (AOO) are both estimated to be 5 km².
Countries occurrence:
Seychelles (Seychelles (main island group))
Estimated area of occupancy (AOO) - km2: 5
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: 10
Continuing decline in number of locations: No
Extreme fluctuations in the number of locations: No
Lower elevation limit (metres): 350
Upper elevation limit (metres): 900
Range Map: Click here to open the map viewer and explore range.

Population [top]

Population: The population was estimated at 500,000 individuals in 2005.
Current Population Trend: Stable
Additional data:
Number of mature individuals: 500000 Continuing decline of mature individuals: No
Extreme fluctuations: No Population severely fragmented: No

Habitat and Ecology [top]

Habitat and Ecology: An high forest species found from 350-900 m, this snail is usually arboreal but is occasionally found in leaf-litter.
Systems: Terrestrial
Continuing decline in area, extent and/or quality of habitat: Yes

Threats [top]

Major Threat(s): Currently, this snail is threatened by habitat degradation throughout its range, caused by invasive non-native plants (e.g., Cinnamomum verum). In the past, small-scale farming and wood plantations were a cause of habitat deterioration.

Conservation Actions [top]

Conservation Actions: The entire range of this species lies within the Morne Seychellois National Park. Research into the species' biology and ecology is needed.

Citation: Gerlach, J. 2009. Nesokaliella minuta. The IUCN Red List of Threatened Species 2009: e.T168164A6461745. . Downloaded on 24 November 2015.
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