Aaadonta kinlochi

Status_ne_offStatus_dd_offStatus_lc_offStatus_nt_offStatus_vu_offStatus_en_offStatus_cr_onStatus_ew_offStatus_ex_off

Taxonomy [top]

Kingdom Phylum Class Order Family
ANIMALIA MOLLUSCA GASTROPODA STYLOMMATOPHORA ENDODONTIDAE

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

During recent surveys in Palau, the single specimen found was larger in shell diameter than the paratypes in the Bishop Museum (Honolulu, Hawaii) with which it was compared. Nonetheless, the shell sculpture of the specimen suggests placement in Aaadonta kinlochi and is treated as such in this assessment.

Assessment Information [top]

Red List Category & Criteria: Critically Endangered B2ab(ii,iii) 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.
Justification:

This is a minute ground-dwelling snail, which was described from a single locality, on Angaur, where 173 specimens were collected in 1936 by Y. Kondo and K. Kondo. However, no specimens were found on this island during surveys in 2005: only a single dead shell was found at a single locality in recent surveys across the Palau archipelago, namely in Ulong (a very small island distant from the type locality) during 2003. It is assessed as Critically Endangered (Possibly Extinct) based on the restricted area of occupancy, the single location and the known current decline in its extent and quality of habitat. Additional surveys of the island are needed to verify whether the species is in fact Extinct, and additional taxonomic work is needed to confirm the identity of the most recently discovered specimen.


History:
1996 Data Deficient
1994 Vulnerable (Groombridge 1994)

Geographic Range [top]

Range Description:

This species was originally known only from Angaur (Ngeaur) in Palau, where 173 specimens were collected at a single locality in 1936 by Y. Kondo and K. Kondo (Solem 1976). The historical known geographic range was less than 8 km2. No specimens were found in 2005 on Angaur (Rundell 2005, unpublished data, Rundell 2010). Only a single dead specimen (and no live specimens) was recovered from a single locality on the small island of Ulong in 2003 (Rundell 2003, unpublished data). If the species persists, its area of occupancy is estimated at less than 4km2.

Countries:
Possibly extinct:
Palau
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population: This species is known from 173 specimens (12 live) that were collected at a single locality in Angaur in 1936 by Y. Kondo and K. Kondo (Solem 1976). Only a single (dead) specimen has been collected since then. No additional information on population size or trends is available.
Population Trend: Decreasing

Habitat and Ecology [top]

Habitat and Ecology:

This is a minute ground-dwelling snail that was recorded from tropical most lowland forest.

Systems: Terrestrial

Use and Trade [top]

Use and Trade: This species is not utilized.

Threats [top]

Major Threat(s):

Destruction or 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 and deforested island of Angaur. 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:

Additional surveys of the island are urgently needed to verify whether the species is in fact Extinct.

Bibliography [top]

IUCN. 2012. IUCN Red List of Threatened Species (ver. 2012.2). Available at: http://www.iucnredlist.org. (Accessed: 17 October 2012).

Rundell, RJ. 2005. The land snails of Belau: Survey of the 16 states.

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 kinlochi. In: The IUCN Red List of Threatened Species. Version 2014.2. <www.iucnredlist.org>. Downloaded on 25 October 2014.
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