Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Arthropoda Malacostraca Decapoda Potamonautidae

Scientific Name: Seychellum alluaudi
Species Authority: (A. Milne-Edwards & Bouvier, 1893)
Deckenia cristata Rathbun, 1894
Taxonomic Notes: This taxon was originally assigned to the genus Deckenia in the family Deckeniidae Ortmann, 1897. Ng et al. (1995) transferred this taxon to the genus Seychellum in the Gecarcinucidae: Gecarcinucinae. This genus is now assigned to the Potamonautidae: Deckeniinae: Deckenini (Cumberlidge et al. 2007).

Assessment Information [top]

Red List Category & Criteria: Least Concern ver 3.1
Year Published: 2008
Date Assessed: 2008-01-01
Assessor(s): Cumberlidge, N.
Reviewer(s): Cumberlidge, N. and McIvor, A.
This species is still currently known only from less than 10 specimens from six locations in four different islands in the Seychelles group in the Indian Ocean. However it is reported to be abundant and is present in a protected area. Therefore it is listed as Least Concern. If there was a decline in habitat quality, it would qualify for EN under B because the extent of occurrence and area of occupancy are less than 500 sq km (EN B1a and B2a) due to its restriction to mountain streams draining rainforest habitats within its range. There is insufficient information on population size and trends and on the number of mature individuals to assess the species under criteria A, C, and D. No quantitative analysis of the probability of extinction has been carried out to assess the species under criterion E. No regional adjustment is necessary because this species is a year-round breeding resident (and not a non-breeding visitor), and its population does not experience any significant immigration.

Geographic Range [top]

Range Description: Seychelles: Mahe, La Digue, Silouette, Praslin islands in the granitic Seychelles. Endemic to the Seychelles.
Countries occurrence:
Seychelles (Seychelles (main island group))
Estimated area of occupancy (AOO) - km2: <450
Number of Locations: 6
Range Map: Click here to open the map viewer and explore range.

Population [top]

Population: This species has been collected recently and appears to be locally abundant but the populations are severely fragmented (it is found on four separate islands).
Current Population Trend: Unknown
Additional data:
Population severely fragmented: No

Habitat and Ecology [top]

Habitat and Ecology: Found in streams in the rainforests of mountains in the centre of the islands.
Systems: Freshwater

Threats [top]

Major Threat(s): Habitat loss.

Conservation Actions [top]

Conservation Actions: None in place. It is found in a protected area.

Citation: Cumberlidge, N. 2008. Seychellum alluaudi. The IUCN Red List of Threatened Species 2008: e.T134959A4042292. . Downloaded on 10 October 2015.
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