Pachnodus lionneti 

Scope: Global
Language: English

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Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Mollusca Gastropoda Stylommatophora Cerastidae

Scientific Name: Pachnodus lionneti Van Mol & Coppois, 1980

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 restricted range (EOO and AOO = 17 km²; known from 2 locations). Within this area populations are stable, but remain vulnerable to further habitat degradation. Habitat quality is currently deteriorating across the species' range due to invasion by non-native plants (e.g. Cinnamomum verum trees).

Geographic Range [top]

Range Description:This snail species is endemic to Silhouette island in the Seychelles. It's extent of occurrence (EOO) and area of occupancy (AOO) are both estimated to be 17 km².
Countries occurrence:
Seychelles (Seychelles (main island group))
Additional data:
Estimated area of occupancy (AOO) - km2:17Continuing decline in area of occupancy (AOO):No
Extreme fluctuations in area of occupancy (AOO):NoEstimated extent of occurrence (EOO) - km2:17
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):250
Upper elevation limit (metres):990
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:An estimated 89,700 adults were recorded in 2005.
Current Population Trend:Stable
Additional data:
Number of mature individuals:89700Continuing decline of mature individuals:No
Extreme fluctuations:NoPopulation severely fragmented:No

Habitat and Ecology [top]

Habitat and Ecology:An arboreal species found in all forest habitats, this snail is most abundant in high forest.
Continuing decline in area, extent and/or quality of habitat:Yes

Threats [top]

Major Threat(s): While habitat degradation from small- and large-scale wood plantations were a threat in the past, degradation from invasive alien species (e.g., Cinnamomum verum) that directly impact this snail's habitat is ongoing.

Conservation Actions [top]

Conservation Actions: No conservation measures have been taken. Silhouette island's forests should be legally protected, and invasive species should be controlled throughout the Seychelles.

Citation: Gerlach, J. 2009. Pachnodus lionneti. The IUCN Red List of Threatened Species 2009: e.T168118A6453790. . Downloaded on 14 December 2017.
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