IUCN SSC Mid-Atlantic Island Invertebrates Specialist Group

Species

BackActinella anaglyptica (Reeve, 1852)

Actinella anaglyptica (Reeve, 1852)

  • Kingdom: Animalia
  • Phylum:
  • Class: Mollusca
  • Order: Gastropoda
  • Family: Hygromiidae
NT Near Treatened
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:

Facilitators / Compilers/s:


Assessment Rationale:

Seddon (2008) suggested an assessment of Vulnerable D2 (version 3.1) as this species has a restricted distribution (19 km²) with past threats from habitat degradation as the result of over-grazing. Past assessments have been Vulnerable since 1994. However, the habitats have been recovering for several years now after the removal of goats from the island and hence the removal of the major threat has lead to improved quality of habitat for this species, hence it is given as revised listing as Near Threatened (NT).  Should the habitats deteriorate, then the species will revert to Vulnerable D2.

Geographic Range:

Actinella anaglyptica is endemic to the Madeiran Islands where it is restricted to the small island of Islas Desertas, where it is found in Chao (Cameron and Cook 1999, Seddon 2008).

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

Population:

There are little recent data on population trends for this species.

Habitat and Ecology

This species is found in grass tussocks amongst rocks and herbs.

Major Threat(s):

The habitat degradation on Chao, originally caused by overgrazing leading to soil erosion, with a subsequent decline in quality of habitats and decline in extent of vegetated cover has now been halted.  However the species remains vulnerable to any changes to the land-area in centre of the island, for example construction or grazing, and as such the threats have declined, and are now subject to land management within the protected areas.

Conservation Actions

The species has benefited from conservation actions targeted at other species with the aim to control and then remove the goats from Chao. This programme has been running for 10 years and has seen large reductions in the goat populations, and hence the habitats are stabilising. Further monitoring is required to review the population levels and recovery of this species.