Palaina rubella 

Scope: Global
Language: English

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Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Mollusca Gastropoda Architaenioglossa Diplommatinidae

Scientific Name: Palaina rubella (Beddome, 1889)

Assessment Information [top]

Red List Category & Criteria: Critically Endangered B1ab(iii)+2ab(iii) ver 3.1
Year Published: 2012
Date Assessed: 2011-08-22
Assessor(s): Rundell, R.J.
Reviewer(s): Cowie, R., Barker, G., Triantis, K., García, N. & Pippard, H.

This species was historically found on the island of Koror in Palau, but was not found there in 2003, 2005, or 2007 surveys. In 2003, 27 live specimens of the species were found at a single locality on the island of Babeldaob. The threat category Critically Endangered is assigned because of the species’ very narrow geographic range (1km2), single location (assuming extirpation on Koror) and ongoing decline of the extent and quality of its habitat, a large part of which has been subject to substantial habitat loss and modification. The island of Babeldaob is under immediate threat of development, as a result of the now completed Compact Road, which makes most areas of the island much more accessible to human encroachment, development, subsidiary roads and thus imminent habitat loss. Further research is required to determine this species' population size, distribution and trends.

Previously published Red List assessments:

Geographic Range [top]

Range Description:

This species was historically described and collected from only the island of Koror (Oreor) in Palau (Beddome 1889, Y. Kondo 1936, unpublished data). However, the species has not been recorded from Koror in recent surveys (Rundell 2010). In 2003 surveys, the species was found at a single locality (Airai) on the island of Babeldaob (Rundell 2005). Thus, although this finding represents an increase in the species' range (which was historically approximately 20 km² on the island of Koror), the area of occupancy is currently estimated at 1 km².

Countries occurrence:
Additional data:
Estimated area of occupancy (AOO) - km2:1
Number of Locations:1
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:The species has not been found on the island of Koror in recent times: surveys carried out in 2003, 2005 and 2007 yielded no individuals (Rundell 2010). During 2003 surveys, 27 live specimens were found at a single locality on the island of Babeldaob (Rundell 2010).
Current Population Trend:Unknown
Additional data:

Habitat and Ecology [top]

Habitat and Ecology:This is a ground-dwelling species recorded in tropical 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):

This species is threatened by destruction and modification of its native forest habitat. The species’ extirpation from Koror, the most heavily populated and modified island in Palau supports this assertion. Given the completion of the paved Compact Road around the island of Babeldaob, the species’ habitat is under direct threat as a result of native forest clearing or modification, particularly since this species’ single locality is adjacent to a significant human population centre.

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. Palaina rubella. The IUCN Red List of Threatened Species 2012: e.T15902A789788. . Downloaded on 20 June 2018.
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