Chilostoma adelozona 

Scope: Global & Europe
Language: English

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Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Mollusca Gastropoda Stylommatophora Helicidae

Scientific Name: Chilostoma adelozona (Strobel, 1857)
Taxonomic Notes: This species has two subspecies: C. adelozona adelozona and C. adelozona rhaeticum.

Assessment Information [top]

Red List Category & Criteria: Vulnerable B1ab(iv) ver 3.1
Year Published: 2011
Date Assessed: 2010-10-01
Assessor(s): Rüetschi, J.
Reviewer(s): Neubert, E., Ward, J. & Bilz, M.
The taxon meets the area requirements under criterion B for Vulnerable with the extent of occurrence thought to be less than 20,000 km2. The population is fragmented and known to be declining in Switzerland with realistic threats to Italian populations. Therefore it is assessed as Vulnerable (VU) B1ab(iv).

This species has also been assessed at the regional level as:
EU27 regional assessment: Data Deficient (DD) at the level of the 27 member states of the European Union as further information on the distribution, size and trends of the populations in Italy is required.
European regional assessment: Vulnerable (VU) B1ab(iv).

Geographic Range [top]

Range Description:This species' distribution includes northern Italy, Austria and southern Switzerland (Ticino). The subspecies C. adelozonav adelozona is endemic to the southern Alps in Lombardia, Bergamask and Adamello with C. adelozona rhaeticum being endemic to the eastern Alps, extending from von Landeck to St. Moritz, and also in the valley of Veltlin. The extent of occurrence is thought to be less than 20,000 km2.
Countries occurrence:
Austria; Italy (Italy (mainland)); Switzerland
Additional data:
Lower elevation limit (metres):900
Upper elevation limit (metres):2400
Range Map:Click here to open the map viewer and explore range.

Population [top]


There is little population data for the species. However, in Switzerland the populations are slightly decreasing.

Current Population Trend:Decreasing
Additional data:
Population severely fragmented:Yes

Habitat and Ecology [top]

Habitat and Ecology:This species lives on moist, shaded, generally carbonate rather than silicate rocks as well as on old mossy walls. The sites are often near water.

Threats [top]

Major Threat(s):

In Switzerland there is no actual threat known and therefore the causes for the decline are not understood. In Italy, quarrying of the rocks is taking place in the area where the species is found and this is a potential threat that this may lead to the loss of some populations in this area.

Conservation Actions [top]

Conservation Actions: The sub-species are listed on the Swiss Red List with C. adelozona adelozona as Endangered (EN) and C. adelozona rhaeticum as Vulnerable (VU) (Turner et al. 1998).

More information on the distribution, size and trends of the populations in Italy as well as potential threats is needed before any conservation actions potentially required are considered.

Citation: Rüetschi, J. 2011. Chilostoma adelozona. The IUCN Red List of Threatened Species 2011: e.T156738A4990239. . Downloaded on 25 September 2018.
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