IUCN SSC Mid-Atlantic Island Invertebrates Specialist Group

Species

BackActinella laciniosa (R.T. Lowe, 1852)

Actinella laciniosa (R.T. Lowe, 1852)

  • Kingdom: Animalia
  • Phylum:
  • Class: Mollusca
  • Order: Gastropoda
  • Family: Hygromiidae
VU Vulnerable
IUCN Red List Status:

Countries of Occurrence:
Portugal - Madeira

Archipelago(s):
Madeira

Assessor/s:
Seddon, M.

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

Contributor/s:
Teixeira, D.

Facilitators / Compilers/s:


Assessment Rationale:

Seddon (2008) suggested the species should be listed as Vulnerable D2 (version 3.1). The species was recently found at three locations on the small island of Chao (0.4 km2) and not relocated in surveys on Deserta Grande (Cameron and Cook 1999). Given that the habitats were impacted in the past by rabbits and goats and using the precautionary principle, this species is listed as Vulnerable (VU) D2, although future restoration projects on Deserta Grande and Chao should eventually see this habitat for this species stabilised, and hence when populations recover, the species would be eligibly for downlisting.

The species was previously listed as Data deficient, as there had been little recent surveys in 1996.  Since then Cameron and Cook have carried out resurveys, establishing distribution, hence the species status has been revised to Vulnerable D2.

Geographic Range:

This species is endemic to the Madeiran islands where it is found on the Desertas (known from Ilheu Chao and near the north end of Deserta Grande). (Paiva's record from Ilheu de Ferro off Porto Santo is discounted as erroneous by Wollaston 1878, p. 121). It has been recorded by Cameron and Cook (1999) from each survey site on Chao, but was not recorded on Deserta Grande.

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 insufficient recent survey data to establish the population trend.

Habitat and Ecology

This species is found on dry hillslopes with heather and grasses.

Major Threat(s):

The habitats were impacted in the past by overgrazing due to introduced rabbits and goats, to habitat degradation and widespread soil erosion (Cameron and Cook 1999, Seddon 2008).

Conservation Actions

There are no known conservation actions specifically for this species. Conservation actions have included a goat eradication programmes over the last 10 years for other species on the island, which should have benefited this species, as the species is vulnerable to habitat change.  Research actions include population monitoring and habitat monitoring, especially for the next five years whilst habitat restoration projects are ongoing on the island.