IUCN SSC Mid-Atlantic Island Invertebrates Specialist Group

Species

BackLeiostyla colvillei Seddon & Killeen, 1996

Leiostyla colvillei Seddon & Killeen, 1996

  • Kingdom: Animalia
  • Phylum:
  • Class: Mollusca
  • Order: Gastropoda
  • Family: Lauriidae
VU Vulnerable
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 is endemic to Madeira, where it is only known from the type locality in the valley of Ribeira de Faja da Nogueira which lies within a remote, relatively inaccessible area. The risk to the species is mainly loss of habitat, possibly from forest fires or storms changing stability of hillslope vegetation and increasing erosion, but this threat is relatively low level.  However, if there is an event, the entire population would be susceptible to extinction, and as such it is listed as Vulnerable D2.

Geographic Range:

This species is endemic to Madeira, where it is only known from the type locality in the valley of Ribeira de Faja da Nogueira on the northern slopes of Pico Arreiro (Seddon 2008).

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

Population:

There are no data on population trends.

Habitat and Ecology

This species is found in litter ledges on north-west facing crags and slopes within Erica arborea and laurel woodland.

Major Threat(s):

This species lies within a remote, relatively inaccessible area, where the risk is mainly loss of habitat, possibly from forest fires or storms changing stability of hillslope vegetation and increasing erosion. This threat is relatively low level.

Conservation Actions

Habitat monitoring is required at known sites to identify future changes in habitat quality, as at present the species is only threatened by extreme weather events or forest fires, but it has a very restricted range, that could be vulnerable to declines if habitat quality declines.