Caseolus Baixoensis

The IUCN Red List of Threatened Species™ ISSN 2307-8235 (online) IUCN 2008: T157116A5039004

Caseolus baixoensis

Assessment by: Seddon, M.B.

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Citation: Seddon, M.B. 2013. Caseolus baixoensis. The IUCN Red List of Threatened Species 2013: e.T157116A5039004. http://dx.doi.org/10.2305/IUCN.UK.2011-1.RLTS.T157116A5039004.en

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THE IUCN RED LIST OF THREATENED SPECIES™ Taxonomy

Kingdom Phylum Class Order Family

Animalia Mollusca Gastropoda Stylommatophora Hygromiidae

Taxon Name: Caseolus baixoensis Walden, 1983

Taxonomic Notes: Walden (1983) recognized a varietal name used by Wollaston, Caseolus commixtus var. pusilla, as meriting specific status, giving it the name baixoensis. Seddon (2008) reports difficulty separating Caseolus baixoensis Walden, 1983 and Caseolus compactus vigiae Walden, 1983, and in the absence of type material of the latter considered that these may be conspecific. Assessment Information

Red List Category & Criteria: Vulnerable D2 ver 3.1

Year Published: 2013

Date Assessed: September 20, 2010

Justification: The species meets the range restriction criteria for Vulnerable B, one confirmed location and possible impact due to recreational use. Seddon (2008) suggested Data Deficient due to taxonomic uncertainties, however due to the precautionary principle a suggested listing of Vulnerable (VU) D2 is proposed, for the single known site. Recommended conservation actions include management of the protected areas for maintenance of this species and monitoring of the protected areas to ensure no loss of further habitat and subpopulations as well as more taxonomic research on the status of the species. Geographic Range

Range Description: This species is endemic to Madeiran islands; it is only known from Porto Santo, where its complete range is uncertain, although there are reported records the South-East hills behind the harbour (Seddon 2008).

Country Occurrence: Native: Portugal (Madeira)

© The IUCN Red List of Threatened Species: Caseolus baixoensis – published in 2013. 2 http://dx.doi.org/10.2305/IUCN.UK.2011-1.RLTS.T157116A5039004.en Population There are few specimens known for this species and hence the status is uncertain. Current Population Trend: Unknown

Habitat and Ecology (see Appendix for additional information) The single known site is grassland with rocky areas.

Systems: Terrestrial

Use and Trade The species is not known to be utilised, although occasionally sold by shell collectors.

Threats (see Appendix for additional information) The main threat is changing land management, for example overgrazing by livestock, and possible impact from recreational activities (creation of footpaths along coastal ridge).

Conservation Actions (see Appendix for additional information) Recommended conservation actions include management of the protected areas for maintenance of this species and monitoring of the protected areas to ensure no loss of further habitat and subpopulations as well as more taxonomic research on the status of the species. Credits

Assessor(s): Seddon, M.B.

Reviewer(s): Groh, K., Cameron, R., Cuttelod, A. & Neubert, E.

Contributor(s): Abreu, C., Cameron, R., Groh, K. & Teixeira, D.

© The IUCN Red List of Threatened Species: Caseolus baixoensis – published in 2013. 3 http://dx.doi.org/10.2305/IUCN.UK.2011-1.RLTS.T157116A5039004.en Bibliography Cameron, R.A.D., Cook, L.M. and Gao, G. 1996. Variation in snail species widespread on Porto Santo, Madeiran archipelago. Journal of Molluscan Studies 62(2): 143-150.

IUCN. 2011. IUCN Red List of Threatened Species (ver. 2011.1). Available at: http://www.iucnredlist.org. (Accessed: 16 June 2011).

Seddon, M.B. 2008. An illustrated compendium ofthe landsnails and slugs of the Madeiran archipelago. Studies in Biodiversity and Systematics of Terrestrial Organisms from the National Museum of Wales. Biotir Reports.

Walden, H.W. 1983. Systematic and biogeographical studies of the terrestrial Gastropoda of Madeira. With an annotated Check-list. Annales Zoologica Fennica 20: 255-275.

Citation Seddon, M.B. 2013. Caseolus baixoensis. The IUCN Red List of Threatened Species 2013: e.T157116A5039004. http://dx.doi.org/10.2305/IUCN.UK.2011-1.RLTS.T157116A5039004.en

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Habitats (http://www.iucnredlist.org/technical-documents/classification-schemes)

Major Season Suitability Habitat Importance? 4. Grassland -> 4.4. Grassland - Temperate - Suitable Yes

Threats (http://www.iucnredlist.org/technical-documents/classification-schemes)

Threat Timing Scope Severity Impact Score 2. Agriculture & aquaculture -> 2.3. Livestock farming Ongoing Minority (50%) Causing/could Low impact: 5 & ranching -> 2.3.2. Small-holder grazing, ranching or cause fluctuations farming Stresses: 1. Ecosystem stresses -> 1.2. Ecosystem degradation 2. Species Stresses -> 2.2. Species disturbance 6. Human intrusions & disturbance -> 6.1. Ongoing - - - Recreational activities Stresses: 1. Ecosystem stresses -> 1.2. Ecosystem degradation

Conservation Actions Needed (http://www.iucnredlist.org/technical-documents/classification-schemes)

Conservation Actions Needed 2. Land/water management -> 2.1. Site/area management

Research Needed (http://www.iucnredlist.org/technical-documents/classification-schemes)

Research Needed 1. Research -> 1.1. Taxonomy

3. Monitoring -> 3.1. Population trends

3. Monitoring -> 3.4. Habitat trends

Additional Data Fields

Distribution Estimated area of occupancy (AOO) (km²): 4

Number of Locations: 1

© The IUCN Red List of Threatened Species: Caseolus baixoensis – published in 2013. 5 http://dx.doi.org/10.2305/IUCN.UK.2011-1.RLTS.T157116A5039004.en The IUCN Red List of Threatened Species™ ISSN 2307-8235 (online) IUCN 2008: T157116A5039004

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