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Pachnodus praslinus 

Scope: Global
Language: English
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Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Mollusca Gastropoda Stylommatophora Cerastidae

Scientific Name: Pachnodus praslinus Gerlach, 1990

Assessment Information [top]

Red List Category & Criteria: Vulnerable B1ab(iii)+2ab(iii); D2 ver 3.1
Year Published: 2009
Date Assessed: 2006-01-11
Annotations:
Needs updating
Assessor(s): Gerlach, J.
Reviewer(s): Miller, R.M., Pollock, C.M. & Seddon, M.
Justification:
The species has an EOO and AOO of only 7 km² and is found in 6 locations. Although populations are stable, they are also vulnerable to further habitat deterioration. Habitat degradation caused by invasive species is an ongoing threat. Predation, probably by introduced rats and tenrecs, is a small additional cause of mortality, but is not thought to be signficant.

Geographic Range [top]

Range Description:Endemic to Praslin island, in the Seychelles islands, this snail has an extent of occurrence (EOO) and an area of occupancy (AOO) of 7 km².
Countries occurrence:
Native:
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) - km2:7
Continuing decline in extent of occurrence (EOO):NoExtreme fluctuations in extent of occurrence (EOO):No
Number of Locations:6Continuing decline in number of locations:No
Extreme fluctuations in the number of locations:NoLower elevation limit (metres):150
Upper elevation limit (metres):250
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:The population was estimated at 7,000 individuals in 2005.
Current Population Trend:Stable
Additional data:
Number of mature individuals:7000Continuing decline of mature individuals:No
Extreme fluctuations:NoPopulation severely fragmented:No
Continuing decline in subpopulations:No
Extreme fluctuations in subpopulations:NoAll individuals in one subpopulation:No

Habitat and Ecology [top]

Habitat and Ecology:This snail is an arboreal species found in palm woodland, from 150-250 m.
Systems:Terrestrial
Continuing decline in area, extent and/or quality of habitat:Yes

Threats [top]

Major Threat(s): This species is vulnerable to habitat deterioration, especially that caused by invasive species. Historically, it was considerably more widespread, with an AOO of some 20 km2, but extensive fires in the 1800s and early 1900s destroyed most of the woodlands on the island. The threat of fire is ongoing. Predation, probably by introduced rats and tenrecs, is a small additional cause of mortality, but is not thought to be significant.

Conservation Actions [top]

Conservation Actions: This species is present in Praslin National Park. Research is needed into its life history and ecology. Invasive species must be controlled throughout the Seychelles islands.

Citation: Gerlach, J. 2009. Pachnodus praslinus. The IUCN Red List of Threatened Species 2009: e.T168111A6451541. . Downloaded on 21 September 2018.
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