Tandonia sowerbyi (A. Férussac, 1823) Tandonia cf. cristata (Kaleniczenko, 1851) – introduced Vitrinidae – terrestrial Vitrina pellucida (O.F. Müller, 1774) Semilimax pyrenaicus (A. Férussac, 1821) – introduced? Boettgerillidae – terrestrial Boettgerilla pallens Simroth, 1912 – introduced Limacidae (keelback slugs) – terrestrial Limax maximus Linnaeus, 1758 Limax cinereoniger Wolf, 1803 Limacus flavus (Linnaeus, 1758) – introduced Limax maculatus (Kaleniczenko, 1851) – introduced Lehmannia marginata (O.F. Müller, 1774) Ambigolimax valentianus (A. Férussac, 1822) – introduced Ambigolimax parvipenis Hutchinson, Reise & Schlitt, 2022 – introduced Agriolimacidae – terrestrial Deroceras laeve (O.F. Müller, 1774) Deroceras reticulatum (O.F. Müller, 1774) Deroceras invadens Reise, Hutchinson, Schunack & Schlitt, 2011 – introduced Deroceras panormitanum (Lessona & Pollonera, 1882) – introduced Ferussaciidae – terrestrial Cecilioides acicula (O.F. Müller, 1774) – probably introduced Clausiliidae (door snails) – terrestrial Cochlodina laminata (Montagu, 1803) Clausilia bidentata bidentata (Ström, 1765) Balea perversa (Linnaeus, 1758) Balea sarsii Pfeiffer, 1847 Testacellidae (shelled slugs) – terrestrial Testacella maugei A. Férussac, 1822 – probably introduced Testacella haliotidea Draparnaud, 1801 – probably introduced Testacella scutulum Sowerby, 1821 – probably introduced Testacella sp. "tenuipenis" – probably introduced Cochlicellidae – terrestrial Cochlicella acuta (O.F. Müller, 1774) – introduced Hygromiidae – terrestrial Ashfordia granulata (Alder, 1830) Candidula gigaxii (L. Pfeiffer, 1850) – introduced Candidula intersecta (Poiret, 1801) – introduced Cernuella virgata (Da Costa, 1778) – probably introduced Helicella itala itala (Linnaeus, 1758) Hygromia cinctella (Draparnaud, 1801) – introduced Trochulus hispidus (Linnaeus, 1758) Trochulus striolatus (Pfeiffer, 1828) Zenobiella subrufescens (Miller, 1822) Helicidae – terrestrial Arianta arbustorum arbustorum (Linnaeus, 1758) Helicigona lapicida lapicida (Linnaeus, 1758) Theba pisana pisana (O.F. Müller, 1774) – introduced Cepaea nemoralis nemoralis (Linnaeus, 1758) Cepaea hortensis (O.F. Müller, 1774) Cornu aspersum aspersum = Helix aspersa (O.F. Müller, 1774) – introduced Bivalvia Margaritiferidae – aquatic Margaritifera margaritifera (Linnaeus, 1758) Unionidae (river mussels) – aquatic Anodonta anatina (Linnaeus, 1758) Anodonta cygnea (Linnaeus, 1758) Sphaeriidae (pea clams, fingernail clams) – aquatic Sphaerium corneum (Linnaeus, 1758) Sphaerium nucleus (Studer, 1820) Musculium lacustre (O.F. Müller, 1774) Pisidium amnicum (O.F. Müller, 1774) Pisidium casertanum (Poli, 1791) Pisidium conventus (Clessin, 1877) Pisidium henslowanum (Sheppard, 1823) Pisidium hibernicum Westerlund, 1894 Pisidium lilljeborgii (Clessin, 1886) Pisidium milium Held, 1836 Pisidium moitessierianum Paladilhe, 1866 Pisidium nitidum Jenyns, 1832 Pisidium obtusale (Lamarck, 1818) Pisidium personatum Malm, 1855 Pisidium pulchellum (Jenyns, 1832) Pisidium pseudosphaerium Favre, 1927 Pisidium subtruncatum Malm, 1855 Dreissenidae – aquatic Dreissena polymorpha (Pallas, 1771) – introduced Dreissena bugensis (Andrusov, 1897) – introduced Corbiculidae (basket clams) – aquatic