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Aaadonta constricta ssp. constricta

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 constricta ssp. constricta
Species Authority: (Semper, 1874)
Parent Species:

Assessment Information [top]

Red List Category & Criteria: Critically Endangered B1ab(i,ii,iii)+2ab(i,ii,iii) ver 3.1
Year Published: 2012
Date Assessed: 2011-08-22
Assessor(s): Rundell, R.J.
Reviewer(s): Pippard, H., Seddon, M. & Barker, G.
Justification:

The sub-species is listed as Critically Endangered. It is a single island endemic, and the very small area where it is currently found, relative to where it was found in 1936, is of particular concern, especially given the fragility of endodontid populations elsewhere in the Pacific. It is now known from a single location and its forest habitat is experiencing declines in quality and extent. Site protection is required, and surveys to determine the current distribution of this species and its population size, status and trends are also recommended.

Geographic Range [top]

Range Description:

The historical geographic range of A. constricta constricta was 12km2. The area of occupancy for this subspecies is now estimated at 1.5km2, reflecting the single locality in native forest where very few specimens were found in recent surveys.

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

Population [top]

Population: This subspecies was previously known from several localities on Peleliu, where a total of 82 specimens were collected by Y. Kondo in 1936 (Solem 1976). In 2005 surveys, seven live shells and three dead shells were found on this island (Rundell 2010).
Population Trend: Unknown

Habitat and Ecology [top]

Habitat and Ecology: This is a ground dwelling snail found in moist lowland forests.
Systems: Terrestrial

Use and Trade [top]

Use and Trade: This species is not utilized.

Threats [top]

Major Threat(s):

This sub-species is threatened by destruction and modification of native lowland forest. Therefore it is not surprising that the area of occupancy of the species has been greatly reduced since World War II, when much of the island’s forest was decimated by flamethrowers (Hinz 1995, Crombie and Pregill 1999). 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:

Field work to define the current distribution of this species, as well as research on its population status and trends, is required. Identification of priority sites for species conservation (e.g. key biodiversity areas that include threatened land snails) and reducing the impacts of human activities, is also urgently needed. The Palau Conservation Society has been supportive of recent land snail survey work in Palau.


Citation: Rundell, R.J. 2012. Aaadonta constricta ssp. constricta. The IUCN Red List of Threatened Species. Version 2014.2. <www.iucnredlist.org>. Downloaded on 01 August 2014.
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