Cochlostoma bicostulatum 

Scope: Global
Language: English

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Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Mollusca Gastropoda Architaenioglossa Diplommatinidae

Scientific Name: Cochlostoma bicostulatum Gofas, 1989
Taxonomic Notes: Latest revision was made by Gofas (2001).

Assessment Information [top]

Red List Category & Criteria: Least Concern ver 3.1
Year Published: 2011
Date Assessed: 2011-02-13
Assessor(s): Fehér, Z.
Reviewer(s): Neubert, E. & Ward, J.

This species lives within a relatively wide range and there are several known sub-populations. There is no reason to suppose that the area of occupancy, extent of occurrence, number of locations, number of sub-populations or the number of mature individuals are declining or extremely fluctuating. Therefore, it is assessed as Least Concern (LC).

Geographic Range [top]

Range Description:This species is distributed in northern Spain (in the Basque county, Cantabria and Asturia). Within its range, this species is not rare: at least 80 locations are published by Gofas (2001). Therefore, there is no reason to suppose that the area of occupancy (300 km2), extent of occurrence (8,500 km2) or the number of locations are declining or extremely fluctuating.
Countries occurrence:
Spain (Spain (mainland))
Additional data:
Estimated area of occupancy (AOO) - km2:300Continuing decline in area of occupancy (AOO):No
Extreme fluctuations in area of occupancy (AOO):NoEstimated extent of occurrence (EOO) - km2:8500
Continuing decline in extent of occurrence (EOO):NoExtreme fluctuations in extent of occurrence (EOO):No
Number of Locations:80Continuing decline in number of locations:No
Extreme fluctuations in the number of locations:No
Upper elevation limit (metres):1300
Range Map:Click here to open the map viewer and explore range.

Population [top]


Within its relatively large range, this species does not seem to be rare. Therefore there is no reason to suppose that the number of sub-populations or the number of mature individuals are declining or extremely fluctuating.

Current Population Trend:Stable
Additional data:
Continuing decline of mature individuals:No
Extreme fluctuations:NoPopulation severely fragmented:No
Continuing decline in subpopulations:No
Extreme fluctuations in subpopulations:NoAll individuals in one subpopulation:No

Habitat and Ecology [top]

Habitat and Ecology:According to Gofas (2001), this species prefers rocky habitats in limestone areas where it is usually found among mounds of loose large stones in shaded places at the base of rocks. This species is usually not found on bare, exposed rock surfaces. It is sometimes found in the same areas as Cochlostoma hidalgoi, but they are separated by the habitat type (C. hidalgoi prefers the rock surface).
Continuing decline in area, extent and/or quality of habitat:No

Threats [top]

Major Threat(s):

Due to its habitat preference, this species does not seem to be very sensitive to ecosystem modification or other realistic threats. Considering that this species inhabits inaccessible locations, drastic and wide-scale ecosystem modification is only a hypothetical threat and local events do not affect the whole population significantly.

Conservation Actions [top]

Conservation Actions: This species is not protected in Spain, although at least a part of its populations live within protected areas in the Picos de Europa National Park and Parque Natural de Fuentes Carrionas y Fuente Cobre-Montaña Palentina. No conservation actions are currently required.

Classifications [top]

0. Root -> 6. Rocky areas (eg. inland cliffs, mountain peaks)
suitability:Suitable  major importance:Yes

In-Place Research, Monitoring and Planning
  Action Recovery plan:No
  Systematic monitoring scheme:No
In-Place Land/Water Protection and Management
  Conservation sites identified:Yes, over part of range
  Occur in at least one PA:Yes
  Percentage of population protected by PAs (0-100):10
  Area based regional management plan:No
  Invasive species control or prevention:No
In-Place Species Management
  Harvest management plan:No
  Successfully reintroduced or introduced beningly:No
  Subject to ex-situ conservation:No
In-Place Education
  Subject to recent education and awareness programmes:No
  Included in international legislation:No
  Subject to any international management/trade controls:No

Bibliography [top]

Gofas, S. 2001. The systematics of Pyrenean and Cantabrian Cochlostoma (Gastropoda, Cyclophoroidea) revisited. Journal of Natural History 35(9): 1277-1369.

IUCN. 2011. IUCN Red List of Threatened Species (ver. 2011.1). Available at: (Accessed: 30 June 2017).

Citation: Fehér, Z. 2011. Cochlostoma bicostulatum. The IUCN Red List of Threatened Species 2011: e.T170539A6785119. . Downloaded on 18 March 2018.
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