Diplommatina crassilabris 

Scope: Global
Language: English

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Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Mollusca Gastropoda Architaenioglossa Diplommatinidae

Scientific Name: Diplommatina crassilabris
Taxonomic Notes: Taxonomy needs to be clarify to see if the last records for this species are the same as the record from Oreor.

Assessment Information [top]

Red List Category & Criteria: Critically Endangered B2ab(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 2005, two live specimens of the species were found at a single locality on the minute island of Ngerechur, just north of the large island of Babeldaob. The threat category Critically Endangered is assigned due to this species’ very narrow geographic range, its single location (assuming extirpation on Koror), and a decline in extent and quality of its habitat. Further research is urgently recommended to determine population size and distribution of this species.

Previously published Red List assessments:

Geographic Range [top]

Range Description:

This species was historically descsribed and collected from the island of Koror in Palau (Kondo 1936, unpublished data, Beddome 1889), but it was not found there in extensive surveys of Palau that took place in 2003, 2005 and 2007 (Rundell 2010). Recently (2005) it was found at a single locality on the minute island of Ngerechur,  just north of the island of Babeldaob (Rundell 2010). Although this finding represents an increase in the species' range, the area of occupancy is currently estimated at 0.5km2.

Countries occurrence:
Additional data:
Estimated area of occupancy (AOO) - km2:0.5
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: In 2005, two live specimens of the species were found at a single locality on the minute island of Ngerechur, just north of the large island of Babeldaob.
Current Population Trend:Unknown
Additional data:

Habitat and Ecology [top]

Habitat and Ecology:

This is a ground-dwelling snail recorded from tropical most lowland forests.

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. Indeed, the species has been extirpated from Koror, the most heavily populated and modified island in Palau. Given the completion of the paved Compact Road (built in late 1990s) around the island of Babeldaob, the island closest to its current occupied area in Ngerechur, the species' habitat is under direct threat as a result of native forest clearing or modification. Islands such as Ngerechur were once considered remote, but are now much more accessible for development. The fact that only two live specimens have been collected thus far suggests that this threat to the species is imminent.

Conservation Actions [top]

Conservation Actions: Field work is necessary to determine the current distribution and population size for this species. Taxonomic research is also required to clarify whether this is the same species as D. crassilabris from Koror.

Citation: Rundell, R.J. 2012. Diplommatina crassilabris. The IUCN Red List of Threatened Species 2012: e.T6659A3136334. . Downloaded on 20 June 2018.
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