IUCN SSC Mid-Atlantic Island Invertebrates Specialist Group

Species

BackLeiostyla fusca (R.T. Lowe, 1852)

Leiostyla fusca (R.T. Lowe, 1852)

  • Kingdom: Animalia
  • Phylum:
  • Class: Mollusca
  • Order: Gastropoda
  • Family: Lauriidae
LC Least Concern
IUCN Red List Status:

Countries of Occurrence:
Portugal - Madeira

Archipelago(s):
Madeira

Assessor/s:
Seddon, M.B.

Reviewer/s:
Cameron, R., Groh, K., Cuttelod, A. & Neubert, E.

Contributor/s:

Facilitators / Compilers/s:


Assessment Rationale:

This species could be regarded as a candidate for Near Threatened (version 3.1), as it has a restricted area of occupancy, it is known from c. 12 sites, all closely located on the north-west coast of Madeira and it ocurs in cliff type habitats susceptible to disturbance by modifications to the roads, so it is close to meet the criteria for Vulnerable B2ab(iii).  However, it is likely to be present on the extensive cliff habitats along the entire coast between Porto Moniz and Sao Vincente, and hence it is unlikely that the threats would lead to a decline that is sufficient to impact the entire cliff habitat, hence it is listed as Least Concern.

Geographic Range:

This species is present in a restricted area along the North Coast of Madeira, where it is known from at least 12 sites along the coast between Porto Moniz and Sao Vicente, but it is probably present at inaccessible portions of the cliffs.

Regions:
Portugal - Madeira
Extent of Occurrence (EOO):
(km2)
Area of Occupancy (AOO):
(km2)
Elevation Lower Limit:
(m)
Elevation Upper Limit:
(m)
Biogeographic Realms:
Palearctic
Presence:
Extant
Origin:
Endemic Madeira
Seasonality:
Resident

Population:

There is no population trend data, but the species is quite frequent in collecting surveys in correct habitats, so it is probably stable.

Habitat and Ecology

This species occurs under dry leaves on rock ledges, behind Sempervivum on rock faces, within debris on rock ledges on dry crags.

Major Threat(s):

The threats to the cliff type habitats are disturbance by modifications to the road which runs along the base of these sea-cliffs, however this impacts a small part of the range, and hence the threats are not viewed as being sufficiently high to endanger the species.

Conservation Actions

No conservation actions are known and none considered necessary, although habitat monitoring for other threatened species in this habitat would benefit this species.