IUCN SSC Mid-Atlantic Island Invertebrates Specialist Group

Species

BackHemicycla efferata (Mousson, 1872)

Hemicycla efferata (Mousson, 1872)

  • Kingdom: Animalia
  • Phylum:
  • Class: Mollusca
  • Order: Gastropoda
  • Family: Halictidae
CR Critically Endangered
IUCN Red List Status:

Countries of Occurrence:
Spain - Canaries

Archipelago(s):
Canaries

Assessor/s:
Groh, K.

Reviewer/s:
Neubert, E., Temple, H.J. & Cuttelod, A.

Contributor/s:

Facilitators / Compilers/s:


Assessment Rationale:

This species is endemic to La Gomera, where it is known from a single location. It is suspected to be declining as a result of overgrazing and rat predation. Consequently it is assessed as Critically Endangered (CR) B1ab(iii)+2ab(iii).

Geographic Range:

This species is endemic to La Gomera. It was described without location data, and rediscovered by R. Hutterer in the 1990s. It is known from one site (one location) in the north-east part of the island, and its area of occupancy and extent of occurrence are inferred to be 4 km².

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

Population:

The population size and trend are not known for this species. Based on findings of several dead shells and subfossil shells in the environment, as well as many in Quaternary deposits, it would appear that the species is declining.

Habitat and Ecology

The species is found in abandoned cultivated area with rocks.

Major Threat(s):

Significant threats to the species include overgrazing by goats and predation by rats.

Conservation Actions

The single site where the species is known to occur is not protected. Monitoring is needed, and measures to address the threats posed by overgrazing and rat predation may be needed.