IUCN SSC Mid-Atlantic Island Invertebrates Specialist Group

Species

BackTruncatellina linearis (Lowe, 1852)

Truncatellina linearis (Lowe, 1852)

  • Kingdom: Animalia
  • Phylum:
  • Class: Mollusca
  • Order: Gastropoda
  • Family: Vertiginidae
DD Data Deficient
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.

Contributor/s:

Facilitators / Compilers/s:


Assessment Rationale:

This species is found in the Madeiran islands. Wollaston (1878) noted that it was only known from sub-fossil deposits on Madeira. However, Hutterer and Groh (1993) reported that Anton de Winter has recorded the species living at Ribeira do Curral between Fajã de Dentro and Fajã. The threats are uncertain, as current distribution is poorly known, as most records are subfossil shells, and other non-native species of Truncatellina are suspected to be present on Madeira (Cameron et al. 2006; Seddon 2008). Hence the species is listed as Data Deficient (DD) pending more information on population status, distribution and threats.

Geographic Range:

This species is found in the Madeiran islands. Wollaston (1878) noted that it was only known from sub-fossil deposits on Madeira. However, Hutterer and Groh (1993) reported that Anton de Winter has recorded the species living at Ribeira do Curral between Fajã de Dentro and Fajã.

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:

The population status of this species is uncertain, as most shells are subfossil.

Habitat and Ecology

Based on other species in this genus, the species is likely to be found in leaf-litter debris on rock ledges and beneath bushes, however very few living records of this species, and requires leaf-litter sieving techniques to find the species.

Major Threat(s):

The threats are uncertain, as current distribution is poorly known, as most records are subfossil  shells, and other non-native species of Truncatellina are suspected to be present on Madeira (Cameron et al. 2006; Seddon 2008).

Conservation Actions

More information on population status, distribution and threats is needed.