O.F. Müller, 1774 Planorbis planorbis (Linnaeus, 1758) Acroloxidae (river limpets) – aquatic Acroloxus lacustris (Linnaeus, 1758) Succineidae (amber snails) – terrestrial (some almost amphibious) Quickella arenaria (Potiez & Michaud, 1838) = Catinella arenaria Succinella oblonga Draparnaud, 1801 Succinea putris Linnaeus, 1758 Oxyloma elegans elegans (Risso, 1826) = Oxyloma pfeifferi (Rossmässler, 1835) Oxyloma sarsii (Esmark, 1886) Cochlicopidae – terrestrial Cochlicopa c.f. lubrica = Cochlicopa lubrica (O.F. Müller, 1774) Cochlicopa c.f. lubricella = Cochlicopa lubricella (Rossmässler, 1835) Pyramidulidae – terrestrial Pyramidula pusilla (Vallot, 1801) Vertiginidae (whorl snails) – terrestrial Columella edentula Draparnaud, 1805) Columella aspera Walden, 1966 Vertigo antivertigo (Draparnaud, 1801) Vertigo geyeri Lindholm, 1925 Vertigo lilljeborgi (Westerlund, 1871) Vertigo moulinsiana (Dupuy, 1849) Vertigo pusilla O.F. Müller, 1774 Vertigo pygmaea (Draparnaud, 1801) Vertigo substriata (Jeffreys, 1833) Vertigo angustior Jeffreys, 1830 Pupillidae – terrestrial Pupilla muscorum (Linnaeus, 1758) Pupilla alpicola (Charpentier, 1837) Lauriidae – terrestrial Leiostyla anglica (Wood, 1828) Lauria cylindracea (da Costa, 1778) Valloniidae – terrestrial Vallonia costata (O.F. Müller, 1774) Vallonia pulchella (O.F. Müller, 1774) Vallonia c.f. excentrica = Vallonia excentrica Sterke, 1892 Acanthinula aculeata (O.F. Müller, 1774) Spermodea lamellata (Jeffreys, 1830) Enidae – terrestrial Merdigera obscura = Ena obscura (O.F. Müller, 1774) Punctidae (dot snails) – terrestrial Punctum pygmaeum (Draparnaud, 1801) Discidae – terrestrial Discus rotundatus rotundatus (O.F. Müller, 1774) Arionidae (roundback slugs) – terrestrial Arion ater (Linnaeus, 1758) Arion flagellus Collinge, 1893 – probably introduced Arion vulgaris Moquin-Tandon, 1855 = (misapplied) Arion lusitanicus Mabille, 1868 – introduced Arion subfuscus Draparnaud, 1805 Arion fuscus (O.F. Müller, 1774) – possibly introduced Arion circumscriptus Johnston, 1828 Arion rufus (Linnaeus, 1758) (Arion silvaticus Lohmander, 1937, currently considered a variety of A. circumscriptus) Arion fasciatus (Nilsson, 1823) – probably introduced Arion hortensis A. Férussac, 1819 Arion distinctus J. Mabille, 1868 Arion owenii Davies, 1979 Arion intermedius (Normand, 1852) Arion occultus Anderson, 2004 – introduced Geomalacus maculosus Allman, 1843 – introduced Pristilomatidae – terrestrial Vitrea contracta (Westerlund, 1871) Vitrea crystallina (O.F. Müller, 1774) Euconulidae – terrestrial Euconulus fulvus (O.F. Müller, 1774) Euconulus alderi (J.E. Gray, 1840) Gastrodontidae – terrestrial Zonitoides nitidus (O.F. Müller, 1774) Zonitoides excavatus (Alder, 1830) Oxychilidae – terrestrial Oxychilus alliarius (Miller, 1822) Oxychilus cellarius (O.F. Müller, 1774) Oxychilus draparnaudi draparnaudi (Beck, 1837) – introduced Oxychilus navarricus helveticus (Blum, 1881) – introduced Aegopinella nitidula (Draparnaud, 1805) Aegopinella pura (Alder, 1830) Nesovitrea hammonis (Ström, 1765) =Perpolita hammonis Milacidae – terrestrial Milax gagates (Draparnaud, 1801) Tandonia rustica (Millet, 1843) Tandonia budapestensis (Hazay, 1881) – introduced