Partula taeniata 

Scope: Global
Language: English

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Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Mollusca Gastropoda Stylommatophora Partulidae

Scientific Name: Partula taeniata
Species Authority: (Moerch, 1850)
Infra-specific Taxa Assessed:
Common Name(s):
English Polynesian Tree Snail, Moorean Viviparious Tree Snail
Taxonomic Notes: Three subspecies are recognized by Crampton (1932) and Johnson, Murray and Clarke (1993): P. t. elongata (Pease), P. t. nucleola, and P. t. simulans. Only P. t. elongata is extant in the wild.

Assessment Information [top]

Red List Category & Criteria: Critically Endangered B2ab(ii,iv) ver 3.1
Year Published: 2009
Date Assessed: 2007-10-12
Assessor(s): Coote, T.
Reviewer(s): Cowie, R. & Seddon, M.B.
The carnivorous snail Euglandina rosea was introduced onto the island in 1977 and there was immediate disastrous impact as a result of predation. No individuals were found during the intensive surveys of the 1980s. An isolated population was discovered in 2003, followed by five more small populations between 2005 and 2007.
Previously published Red List assessments:

Geographic Range [top]

Range Description:This species was widespread in central and southern Moorea, where it is an endemic. Now it is restricted to a few tiny isolated populations within the same range area.
Countries occurrence:
French Polynesia (Society Is.)
Additional data:
Estimated area of occupancy (AOO) - km2:1-5Continuing decline in area of occupancy (AOO):Yes
Extreme fluctuations in area of occupancy (AOO):NoEstimated extent of occurrence (EOO) - km2:
Number of Locations:5Continuing decline in number of locations:Yes
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:It is difficult to assess population numbers.
Current Population Trend:Unknown
Additional data:
Number of mature individuals:10-100
Population severely fragmented:Yes

Habitat and Ecology [top]

Habitat and Ecology:Currently, the species is found at low altitudes in disturbed habitat in lowland moist forest.

Threats [top]

Major Threat(s): Euglandina rosea is still the principal threat though there is evidence that P. t. elongata may be able to persist in low densities in the presence of the predator. The principal intrinsic threats are those associated with small populations.

Conservation Actions [top]

Conservation Actions: This species is maintained in the international breeding programme. There is a realistic possibility of future re-establishment.

Classifications [top]

1. Forest -> 1.6. Forest - Subtropical/Tropical Moist Lowland
suitability:Suitable  major importance:Yes
3. Species management -> 3.3. Species re-introduction -> 3.3.1. Reintroduction
3. Species management -> 3.4. Ex-situ conservation -> 3.4.1. Captive breeding/artificial propagation

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:Unknown ♦ severity:Unknown ⇒ Impact score:Unknown 
→ Stresses
  • 2. Species Stresses -> 2.1. Species mortality

1. Research -> 1.2. Population size, distribution & trends
1. Research -> 1.5. Threats
1. Research -> 1.6. Actions
3. Monitoring -> 3.1. Population trends

Bibliography [top]

Coote, T. and Loeve, E. 2003. From 61 species to five: endemic tree snails of the Society Islands, French Polynesia fall prey to an ill-judged biological control programme. Oryx 37(1): 91-96.

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

Murray, J,, Murray, E, Johnson, M.S. and Clarke, B.C. 1988. The Extinction of Partula on Moorea. Pacific Science 42(3-4): 150-153.

T Coote. 2005. Surveys on Moorea, March – June 2005. The search for populations of endemic partulids. Unpublished report..

Citation: Coote, T. 2009. Partula taeniata. In: The IUCN Red List of Threatened Species 2009: e.T16282A5596415. . Downloaded on 01 May 2017.
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