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Pachnodus becketti 

Scope: Global
Language: English
Status_ne_offStatus_dd_offStatus_lc_offStatus_nt_offStatus_vu_offStatus_en_onStatus_cr_offStatus_ew_offStatus_ex_off

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Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Mollusca Gastropoda Stylommatophora Cerastidae

Scientific Name: Pachnodus becketti Gerlach, 1994

Assessment Information [top]

Red List Category & Criteria: Endangered B1ab(iii)+2ab(iii) 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.B.
Justification:
This species has a restricted range (EOO = 10 km²; AOO = 6 km²; found in 4 locations), throughout which habitat degradation caused by invasive plant species (e.g., Cinnamomum verum) is ongoing. The severity of the effects of such degradation on this species is unknown; fortunately, populations are currently stable.

Geographic Range [top]

Range Description:This terrestrial snail is endemic to Mahé island, in the Seychelles. Its extent of occurrence (EOO) is estimated to be 10 km² and its area of occupancy (AOO) is 6 km².
Countries occurrence:
Native:
Seychelles (Seychelles (main island group))
Additional data:
Estimated area of occupancy (AOO) - km2:6Continuing decline in area of occupancy (AOO):No
Extreme fluctuations in area of occupancy (AOO):NoEstimated extent of occurrence (EOO) - km2:10
Continuing decline in extent of occurrence (EOO):NoExtreme fluctuations in extent of occurrence (EOO):No
Number of Locations:4Continuing decline in number of locations:No
Extreme fluctuations in the number of locations:NoLower elevation limit (metres):250
Upper elevation limit (metres):600
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:In 2005, the population was estimated to consist of 50,500 adults.
Current Population Trend:Stable
Additional data:
Number of mature individuals:50500Continuing 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 high forest from 250-600 m.
Systems:Terrestrial
Continuing decline in area, extent and/or quality of habitat:Yes
Generation Length (years):2

Threats [top]

Major Threat(s): Small scale wood plantations threatened the species' habitat in the past, but are no longer considered a threat. However, this snail is still vulnerable to ongoing habitat degradation across its range, caused by invasive non-native species (e.g., Cinnamomum verum).

Conservation Actions [top]

Conservation Actions: No conservation measures are in place for this species. The La Reserve-Brullee area of Mahé should be protected, and invasive plant species must be controlled.

Citation: Gerlach, J. 2009. Pachnodus becketti. The IUCN Red List of Threatened Species 2009: e.T168115A6452824. . Downloaded on 24 September 2017.
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