| Kingdom | Phylum | Class | Order | Family |
|---|---|---|---|---|
| ANIMALIA | MOLLUSCA | GASTROPODA | ARCHITAENIOGLOSSA | DIPLOMMATINIDAE |
| Scientific Name: | Opisthostoma fraternum |
| Species Authority: | E.A. Smith, 1905 |
| Red List Category & Criteria: | Critically Endangered B2ab(iii) ver 3.1 |
| Year Published: | 2004 |
| Assessor/s: | Schilthuizen, M. & Vermeulen, J. |
| Reviewer/s: | Seddon, M.B. & Schilthuizen, M. (Mollusc Red List Authority) |
|
Justification: Listed as Critically Endangered because the AOO is 0.01 km², and it is only known from a single locality which has declining habitat quality due to logging in the forest and quarrying threats. Two subpopulations have already been lost. The species is also at risk due to hybrization, and there are very few pure individuals present on outcrop. It may also qualify for listing under Criteria C2b and possibly A2e. |
|
| Range Description: | Recorded from Batu Tomanggong Besar, a small limestone outcrop along the Kinabatangan River in Sabah, Malaysia. Only found at the north end of the outcrop, where it hybridizes with O. concinnum. |
| Countries: |
Native:
Malaysia (Sabah)
|
| Range Map: | Click here to open the map viewer and explore range. |
| Population: | Very few "pure" specimens can be found. |
| Population Trend: |
Decreasing
|
| Habitat and Ecology: | Occurs in lowland tropical Dipterocarp rainforest on limestone. |
| Systems: | Terrestrial |
| Major Threat(s): | Repeated logging and plantations cause drying out of the vegetation, which results in a decline in the Prosobranch populations. Quarrying has lead to the loss of two subpopulations, and hybridization may pose a serious threat to this species in the last remaining locality. |
| Citation: | Schilthuizen, M. & Vermeulen, J. 2004. Opisthostoma fraternum. In: IUCN 2011. IUCN Red List of Threatened Species. Version 2011.2. <www.iucnredlist.org>. Downloaded on 25 May 2012. |
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