Hemicycla efferata 

Scope: Global & Europe
Language: English

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Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Mollusca Gastropoda Stylommatophora Helicidae

Scientific Name: Hemicycla efferata (Mousson, 1872)

Assessment Information [top]

Red List Category & Criteria: Critically Endangered B1ab(iii)+2ab(iii) ver 3.1
Year Published: 2011
Date Assessed: 2011-03-24
Assessor(s): Groh, K.
Reviewer(s): Neubert, E., Temple, H.J. & Cuttelod, A.
This species is endemic to La Gomera, where it is known from a single location. It is suspected to be declining as a result of overgrazing and rat predation. Consequently it is assessed as Critically Endangered (CR) B1ab(iii)+2ab(iii).

Geographic Range [top]

Range Description:

This species is endemic to La Gomera. It was described without location data, and rediscovered by R. Hutterer in the 1990s. It is known from one site (one location) in the north-east part of the island, and its area of occupancy and extent of occurrence are inferred to be 4 kmĀ².

Countries occurrence:
Spain (Canary Is.)
Additional data:
Estimated area of occupancy (AOO) - km2:4
Number of Locations:1
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:The population size and trend are not known for this species. Based on findings of several dead shells and subfossil shells in the environment, as well as many in Quaternary deposits, it would appear that the species is declining.
Current Population Trend:Decreasing
Additional data:
Population severely fragmented:No

Habitat and Ecology [top]

Habitat and Ecology:The species is found in abandoned cultivated area with rocks.
Continuing decline in area, extent and/or quality of habitat:Yes

Use and Trade [top]

Use and Trade: This species is not used.

Threats [top]

Major Threat(s): Significant threats to the species include overgrazing by goats and predation by rats.

Conservation Actions [top]

Conservation Actions: The single site where the species is known to occur is not protected. Monitoring is needed, and measures to address the threats posed by overgrazing and rat predation may be needed.

Citation: Groh, K. 2011. Hemicycla efferata. The IUCN Red List of Threatened Species 2011: e.T156766A4993985. . Downloaded on 18 September 2018.
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