Samoana attenuata 

Scope: Global
Language: English

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Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Mollusca Gastropoda Stylommatophora Partulidae

Scientific Name: Samoana attenuata Pease, 1864
Common Name(s):
English Polynesian Tree Snail, Slender Samoana tree snail
Partula attenuata
Samoana solitaria Crampton
Taxonomic Notes: Recorded as Partula solitaria on Moorea by Crampton (1932) but reclassified by Kondo (1968). High altitude populations of S. attenuata turned out to be S. burchi (Ó. Foighi pers. comm.).

Assessment Information [top]

Red List Category & Criteria: Critically Endangered A2e; B2ab(ii,iv) ver 3.1
Year Published: 2009
Date Assessed: 2007-09-21
Needs updating
Assessor(s): Coote, T.
Reviewer(s): Cowie, R. & Seddon, M.B.
The introduction of the carnivorous snail Euglandina rosea onto all the Society Islands has impacted on the on the distribution. No live individuals were found in intensive surveys on Bora Bora in 1991, or on Raiatea in 2000. A small population was found on Moorea in 1996 and a few small populations on Tahiti during the surveys of 2003-2005. A few individuals were found on Raiatea in 2006.
Previously published Red List assessments:

Geographic Range [top]

Range Description:Extant on Tahiti, Moorea and Raiatea, Society Islands. Extinct on Bora Bora.
Countries occurrence:
French Polynesia (Society Is.)
Additional data:
Estimated area of occupancy (AOO) - km2:<10
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:This species is notoriously elusive but certainly very rare in lowland Tahiti and slopes of Moorea. One individual recently was discovered on the highest point of Raiatea.
Current Population Trend:Decreasing
Additional data:
Number of mature individuals:100
Population severely fragmented:Yes

Habitat and Ecology [top]

Habitat and Ecology:The snail has a preference for higher branches in trees and often drier ridges. However, it is also found in at least one wet valley of Tahiti.

Threats [top]

Major Threat(s): Euglandina rosea remains the principal threat. The intrinsic problems of small population size are also a danger but it is likely that this species has always existed in low densities.

Conservation Actions [top]

Conservation Actions: In-situ management. Does not appear to survive in ex-situ breeding colonies.

Classifications [top]

1. Forest -> 1.6. Forest - Subtropical/Tropical Moist Lowland
suitability:Suitable  major importance:Yes
1. Forest -> 1.9. Forest - Subtropical/Tropical Moist Montane
suitability:Suitable  major importance:Yes

In-Place Research, Monitoring and Planning
In-Place Land/Water Protection and Management
In-Place Species Management
  Subject to ex-situ conservation:Yes
In-Place Education
8. Invasive and other problematic species, genes & diseases -> 8.1. Invasive non-native/alien species/diseases -> 8.1.2. Named species [ Euglandina rosea ]
♦ timing:Ongoing ♦ scope:Majority (50-90%) ♦ severity:Rapid Declines ⇒ Impact score:Medium Impact: 7 
→ Stresses
  • 2. Species Stresses -> 2.1. Species mortality

Bibliography [top]

Coote, T. 2007. Partulids on Tahiti: differential persistence of a minority of endemic taxa among relict populations. American Malacological Bulletin 22: 83-87.

IUCN. 2009. IUCN Red List of Threatened Species (ver. 2009.2). Available at: (Accessed: 3 November 2009).

Citation: Coote, T. 2009. Samoana attenuata. In: . The IUCN Red List of Threatened Species 2009: e.T19884A9106605. . Downloaded on 23 September 2018.
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