Hemicycla Plicaria

The IUCN Red List of Threatened Species™ ISSN 2307-8235 (online) IUCN 2008: T9878A13024289

Hemicycla plicaria

Assessment by: Groh, K. & Alonso, R.

View on www.iucnredlist.org

Citation: Groh, K. & Alonso, R. 2013. Hemicycla plicaria. The IUCN Red List of Threatened Species 2013: e.T9878A13024289. http://dx.doi.org/10.2305/IUCN.UK.2011-1.RLTS.T9878A13024289.en

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THE IUCN RED LIST OF THREATENED SPECIES™ Taxonomy

Kingdom Phylum Class Order Family

Animalia Mollusca Gastropoda Stylommatophora Helicidae

Taxon Name: Hemicycla plicaria (Lamarck, 1816) Assessment Information

Red List Category & Criteria: Critically Endangered B2ab(iii) ver 3.1

Year Published: 2013

Date Assessed: September 29, 2010

Justification: The species has a small range (one single location in an area of occupancy of 8 km2). Over the last 30 years, its small population has become fragmented by urban expansion and road construction. The habitat requires conservation in order to protect the species, as well as restoration of habitats to reduce fragmentation of the populations. This species is assessed as Critically Endangered (CR) B2ab(iii).

Previously Published Red List Assessments 1996 – Lower Risk/least concern (LR/lc)

1994 – Endangered (E)

1990 – Endangered (E)

Geographic Range

Range Description: This species is endemic to Tenerife, where it is very localised between the three villages of Caletillas, Candelaria and Igueste de Candelaria [UTM 28RCS63-64].

Country Occurrence: Native: Spain (Canary Is.)

© The IUCN Red List of Threatened Species: Hemicycla plicaria – published in 2013. 2 http://dx.doi.org/10.2305/IUCN.UK.2011-1.RLTS.T9878A13024289.en Population The population is decreasing. Current Population Trend: Decreasing

Habitat and Ecology (see Appendix for additional information) This species occurs in the typical dry lowland vegetation (Piso basal) within a Barranco., under stones and in rock crevices or in the shelter inside of the sparsely growing shrubs.

Systems: Terrestrial

Use and Trade This species is not used.

Threats (see Appendix for additional information) In the last 25-30 years, the habitat has been nearly completely destroyed by urban developments from the 3 adjacent villages and transportation links between them. The main stress remains the fragmentation of the remaining populations by these developments.

Conservation Actions (see Appendix for additional information) The habitat requires conservation in order to protect the species, as well as restoration of habitats to reduce fragementation of the populations. This species is listed as Critically Endangered on the Spanish Red List by Verdu and Galante (2009) and is on the register of Endangered Species for Canary Islands, but not on the catalogue of Endangered Species in Spain. Actions recommended include the provision of a protected area between the three villages of Caletillas, Candelaria and Igueste de Candelaria. Credits

Assessor(s): Groh, K. & Alonso, R.

Reviewer(s): Neubert, E., Seddon, M.B. & Cuttelod, A.

© The IUCN Red List of Threatened Species: Hemicycla plicaria – published in 2013. 3 http://dx.doi.org/10.2305/IUCN.UK.2011-1.RLTS.T9878A13024289.en Bibliography Ibanez, M., Groh, K., Cavero, E. and Alonso, M.R. 1987. Revision of the genus Hemicycla Swainson 1840 on Tenerife: the group of Hemicycla plicaria (Lamarck 1816) (Mollusca: Helicidae). Arch. Moll. 118: 77- 103.

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

Verdú, J. and Galante, E. 2009. Atlas de los Invertebrados Amenazados de España (Especes en peligro critico y en peligro). Direccion General para la Biodiversidad, Ministerio de Medio Ambiente, Madrid.

Citation Groh, K. & Alonso, R. 2013. Hemicycla plicaria. The IUCN Red List of Threatened Species 2013: e.T9878A13024289. http://dx.doi.org/10.2305/IUCN.UK.2011-1.RLTS.T9878A13024289.en

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

Major Season Suitability Habitat Importance? 3. Shrubland -> 3.4. Shrubland - Temperate - Suitable Yes

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

Threat Timing Scope Severity Impact Score 1. Residential & commercial development -> 1.1. Ongoing Majority (50- Very rapid High impact: 8 Housing & urban areas 90%) declines Stresses: 1. Ecosystem stresses -> 1.1. Ecosystem conversion 1. Ecosystem stresses -> 1.2. Ecosystem degradation 2. Species Stresses -> 2.1. Species mortality 4. Transportation & service corridors -> 4.1. Roads & Ongoing Majority (50- Very rapid High impact: 8 railroads 90%) declines Stresses: 1. Ecosystem stresses -> 1.1. Ecosystem conversion 1. Ecosystem stresses -> 1.2. Ecosystem degradation 2. Species Stresses -> 2.1. Species mortality

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

Conservation Actions Needed 1. Land/water protection -> 1.1. Site/area protection

2. Land/water management -> 2.3. Habitat & natural process restoration

Additional Data Fields

Distribution Estimated area of occupancy (AOO) (km²): 8

Number of Locations: 1

Population Population severely fragmented: Yes

Habitats and Ecology Continuing decline in area, extent and/or quality of habitat: Yes

© The IUCN Red List of Threatened Species: Hemicycla plicaria – published in 2013. 5 http://dx.doi.org/10.2305/IUCN.UK.2011-1.RLTS.T9878A13024289.en The IUCN Red List of Threatened Species™ ISSN 2307-8235 (online) IUCN 2008: T9878A13024289

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