Aaadonta constricta ssp. babelthuapi 

Scope: Global
Language: English

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Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Mollusca Gastropoda Stylommatophora Endodontidae

Scientific Name: Aaadonta constricta ssp. babelthuapi Solem, 1976
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): Seddon, M., Pippard, H. & Barker, G.

This subspecies was previously known from a single locality on Babeldaob in Palau (where it is no longer found, and a single locality on Ngemelis, where it is also no longer found. It was recently found at another location - Ngatpang State on Babeldoab-  in 2003. The species is given an assessment of Critically Endangered. The subspecies is found in a very small area, and from only one location. It is experiencing declines in habitat quality and extent. This is of particular concern, given the fragility of endodontid populations elsewhere in the Pacific, and the imminent threat of development activities on Babeldaob.

Geographic Range [top]

Range Description:

Aaadonta constricta babelthuapi is a minute ground-dwelling snail. This subspecies was previously known from a single locality on Babeldaob (where it is no longer found: Rundell 2005; R.J. Rundell, 2005, unpublished data) and a single locality on Ngemelis, where it is also no longer found (R.J. Rundell, 2005, unpublished data). The historical geographic range of this sub-species is estimated at 10km2. The area of occupancy for this subspecies is now estimated to be 1km2, and very few specimens were found recently at few localities in native forest in another part of Babeldoab - Ngatpang State -  in 2003

Countries occurrence:
Additional data:
Estimated area of occupancy (AOO) - km2:1Continuing decline in area of occupancy (AOO):Yes
Estimated extent of occurrence (EOO) - km2:10
Continuing decline in extent of occurrence (EOO):Yes
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 species is no longer known from the single Babeldaob locality, nor Ngemelis, where the species was earlier reported (Rundell 2005, R.J. Rundell, 2005, unpublished data). However, three live shells were found in Ngatpang State on Babeldoab in 2003 (Rundell 2005, R.J. Rundell, 2003, unpublished data).
Current Population Trend:Unknown
Additional data:

Habitat and Ecology [top]

Habitat and Ecology:This is a ground dwelling snail found in moist 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):

A. constricta babelthuapi is threatened by destruction or modification of native lowland forest. Disruption of the ground, rocks and leaf litter may be of particular significance to this and other endodontid species. These threats are imminent, since the type locality for the species is on the island of Babeldaob, which is currently undergoing significant change due in part to the completion of the paved Compact Road around the island, which is facilitating development of previously remote locations. 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, especially on the small islands, 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. babelthuapi. The IUCN Red List of Threatened Species 2012: e.T198783A2534750. . Downloaded on 18 June 2018.
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