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Terrestrial molluscs: IUCN Red List Status

These summary statistics and analyses are based on the European terrestrial mollusc dataset published in November 2011.

The status of selected terrestrial molluscs was assessed at two regional levels: geographical Europe and the EU 27. Among the species assessed at the European level, at least 20% are considered threatened, from which at least 4.3% are Critically Endangered, 4.1% Endangered and 11.5% Vulnerable. Eleven of the 53 Critically Endangered species are considered Possibly Extinct and three species are listed as already Extinct. A further 14.8% of the species are classified as Near Threatened.

Within the EU 27, the pattern is very similar: at least 20.7% of the selected terrestrial molluscs are threatened, of which at least 4.6% are Critically Endangered, 4.3% Endangered and 11.8% Vulnerable. In addition, 8.4% of species are considered as Near Threatened.

Summary of numbers of terrestrial mollusc species within each category of threat.
IUCN Red List categories No. species Europe (no. endemic species) No. species EU 27 (no. endemic species)
Extinct (EX) 3 (3) 2 (2)
THREATENED
CATEGORIES
Critically Endangered (CR) 53 (52) 52 (51)
Endangered (EN) 51 (49) 49 (45)
Vulnerable (VU) 142 (135) 134 (122)
  Near Threatened (NT) 182 (176) 156 (138)
Least Concern (LC) 677 (622) 625 (389)
Data Deficient (DD) 125 (124) 120 (99)
Total number of species assessed * 1233 (1161) 1138 (846)

*This table does not include the Not Applicable species in Europe and/or the EU (species introduced after AD 1500 or species of marginal occurrence). For the EU 27 assessment the Not Evaluated species (species which do not occur in the EU) are also excluded.

Red List status of terrestrial molluscs in Europe

Red List Status of terrestrial molluscs in Europe
Red List Status of terrestrial molluscs in Europe
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Red List Status of terrestrial molluscs in EU 27
Red List Status of terrestrial molluscs in EU 27
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Status by taxonomic group

This project focused on seventeen families, for which all the species native to Europe have been assessed. There are considerable differences in the number of species and in the threatened status, with the Lauriidae and Trissexodontidae being the most threatened, while the Pupillidae, the Bradybaenidae (consisting of only one species), the Orculidae and the Valloniidae are the least threatened. The bulk of the species are included in three families: the Hygromiidae, Helicidae and Enidae.

Red List status of terrestrial molluscs (in Europe) by taxonomic family.
Family Total* EX CR EN VU NT LC DD % Threatened
Aciculide 52 0 1 0 12 14 21 4 25.00%
Argnidae 30 0 0 0 4 8 17 1 13.30%
Bradybaenidae 1 0 0 0 0 0 1 0 0.00%
Chondrinidae 55 0 0 0 12 9 31 3 21.80%
Cochlicellidae 27 0 4 1 2 5 12 3 25.90%
Diplommatinidae 60 0 0 0 7 7 44 2 11.70%
Enidae 155 0 4 3 12 21 93 22 12.30%
Helicidae 244 0 14 13 22 35 109 31 21.90%
Helicondontidae 16 0 0 1 1 2 11 1 12.50%
Hygromiidae 397 2 19 26 46 49 218 37 22.90%
Lauriidae 37 1 5 2 8 3 13 5 40.50%
Orculidae 43 0 2 0 1 3 33 4 7.00%
Pupillidae 5 0 0 0 0 0 4 1 0.00%
Trissexodontidae 24 0 0 1 6 8 9 0 29.20%
Valloniidae 13 0 0 1 0 3 8 1 7.70%
Vertiginidae 38 0 0 2 4 5 21 6 15.80%
Vitrinidae 56 0 4 1 5 10 32 4 17.90%
Total 1233 3 53 51 142 182 677 125 20.00%

*Does not include species classed as Not Applicable (NA).