Disculella spirulina 

Scope: Global & Europe
Language: English

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Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Mollusca Gastropoda Stylommatophora Hygromiidae

Scientific Name: Disculella spirulina (Cockerell, 1921)
Disculella spirulina (Cockerell, 1921)
Ochthephila spirulina (Cockerell, 1921)
Taxonomic Notes: This species is also known as Ochthephila spirulina not Disculella (amendation by Walden 1983).

Assessment Information [top]

Red List Category & Criteria: Vulnerable D2 ver 3.1
Year Published: 2011
Date Assessed: 2010-09-21
Assessor(s): Seddon, M.B.
Reviewer(s): Cameron, R., Groh, K., Cuttelod, A. & Neubert, E.
Contributor(s): Abreu, C. & Teixeira, D.
The species was originally assessed as Vulnerable in the earlier Red Lists (1994), as it had a small area of occupancy, and it was considered as Vulnerable (B and D) in subsequent revisions of the Red List categories and criteria (2000). The species Disculella spirulina was considered by Seddon (2008) to be Vulnerable B2ab(iii) (version 3.1) as it has an area of occupancy of under 60 km2, and is known from 5-10 locations along the coast. It is considered more rare than the other species of Disculella, as it is found in lower abundance at sites.  Although there is still plenty of habitat suitable, the restricted distribution and habitat disturbance grant this species the status of Vulnerable (VU) D2. If part of the region was protected, then the reduced risk of disturbance would probably allow the species to be considered as Near Threatened (NT).
Previously published Red List assessments:

Geographic Range [top]

Range Description:This species is endemic to the Madeiran archipelago, where it is restricted to the southwestern coast of Madeira, between Paul do Mar and Ponto do Pargo (Seddon 2008).  There are at present between 5 and 10 locations (assuming some locations are less accessible and have not been recorded) in this small area of occupancy.
Countries occurrence:
Portugal (Madeira)
Additional data:
Estimated area of occupancy (AOO) - km2:20-50
Number of Locations:5-10
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:The population trends for this species are not known.
Current Population Trend:Unknown
Additional data:

Habitat and Ecology [top]

Habitat and Ecology:This species occurs in grassland, scrub and on rocky slopes, where it is typically found on the underside of stones and in litter at the base of crags (Seddon 2008).
Continuing decline in area, extent and/or quality of habitat:No

Use and Trade [top]

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

Threats [top]

Major Threat(s): The main threats are habitat disturbance, agricultural improvement of grassland (pesticides) and fire. Building development for tourism in the region of Paul do Mar over the last ten years, has reduced the habitat quality in the area.

Conservation Actions [top]

Conservation Actions: Habitat monitoring is required at selected sites to ensure  disturbance is not impacting the species.  There are few protected areas in the range of this species, and establishment of a small area would benefit the species through reduction of the impact of development for tourism.

Citation: Seddon, M.B. 2011. Disculella spirulina. The IUCN Red List of Threatened Species 2011: e.T40043A10310451. . Downloaded on 15 August 2018.
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