Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Mollusca Gastropoda Stylommatophora Endodontidae

Scientific Name: Aaadonta pelewana
Species Authority: Solem, 1976
Taxonomic Notes:

Assessment Information [top]

Red List Category & Criteria: Critically Endangered (Possibly Extinct) D ver 3.1
Year Published: 2012
Date Assessed: 2011-08-22
Assessor(s): Rundell, R.J.
Reviewer(s): Barker, G., Cowie, R., Triantis, K. & GarcĂ­a, N.
Facilitator/Compiler(s): Pippard, H.

No specimens of this species have been found recently, despite surveys of Palauan islands in 2003, 2005 and 2007. The species was previously known only from Peleliu and Koror and several unspecified locations in Palau (Solem 1976). It is listed as Critically Endangered (Possibly Extinct) as it is believed that it may be extirpated from its historically known distribution, and only seven individuals were ever known. Additional surveys of the island are urgently needed to verify whether the species is in fact Extinct.

Previously published Red List assessments:
1996 Data Deficient (DD)
1994 Vulnerable (V)

Geographic Range [top]

Range Description:

The historical geographic range of this species is unknown, due to several collections from unspecified Palau islands, but included the islands of Koror (Oreor) and Peleliu (Beliliou) which have an areas less than 19 km2 (Solem 1976). No specimens were recovered in recent surveys of Palau (Rundell 2010, Rundell 2007, unpublished data).

Countries occurrence:
Possibly extinct:
Estimated area of occupancy (AOO) - km2:0-10
Lower elevation limit (metres):1
Upper elevation limit (metres):200
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:This is a minute ground-dwelling snail for which no specimens have been found recently, despite surveys of the islands in 2003, 2005 and 2007 (Rundell 2010). The species was previously known only from Peleliu and Koror, and was described based on seven museum specimens, all of which were collected prior to World War II (Solem 1976).
Current Population Trend:Decreasing
Additional data:
Number of mature individuals:0-49

Habitat and Ecology [top]

Habitat and Ecology:

This species was recorded from tropical most lowland forest.

Continuing decline in area, extent and/or quality of habitat:Yes

Use and Trade [top]

Use and Trade: This species is not utilized.

Threats [top]

Major Threat(s):

Destruction and modification of native lowland forest is a major threat to this species. Therefore, it is not surprising that the species has probably been extirpated from the highly modified islands of Koror and Peleliu. Disruption of the ground, rocks and leaf litter may be of particular significance to this and other endodontid species. Endodontoid land snails are among the most threatened land snails on Pacific Islands in the few places where they still exist (Solem 1983).

Conservation Actions [top]

Conservation Actions:

This species is not protected. Additional surveys of the islands are needed to verify whether the species is in fact Extinct.

Classifications [top]

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

In-Place Research, Monitoring and Planning
In-Place Land/Water Protection and Management
In-Place Species Management
In-Place Education
5. Biological resource use -> 5.3. Logging & wood harvesting -> 5.3.5. Motivation Unknown/Unrecorded
♦ timing: Ongoing ♦ scope: Unknown ♦ severity: Unknown ⇒ Impact score: Unknown 
→ Stresses
  • 1. Ecosystem stresses -> 1.1. Ecosystem conversion
  • 1. Ecosystem stresses -> 1.2. Ecosystem degradation

1. Research -> 1.2. Population size, distribution & trends

Bibliography [top]

IUCN. 2012. IUCN Red List of Threatened Species (ver. 2012.2). Available at: (Accessed: 17 October 2012).

Rundell, RJ. 2010. Diversity and conservation of the land snail fauna of the western Pacific islands of Belau (Republic of Palau, Oceania). American Malacological Bulletin 28: 81-90.

Solem, A. 1976. Endodontoid land snails from Pacific islands (Mollusca: Pulmonata: Sigmurethra). Part I. Family Endodontidae. Field Museum of Natural History, Chicago.

Solem, A. 1983. Endodontoid land snails from Pacific islands (Mollusca: Pulmonata: Sigmurethra). Part II. Families Punctidae and Charopidae. Zoogeography. Field Museum of Natural History, Chicago.

Citation: Rundell, R.J. 2012. Aaadonta pelewana. In: The IUCN Red List of Threatened Species 2012: e.T8A3148704. . Downloaded on 09 October 2015.
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