The last comprehensive list of the slug species of Britain and Ireland was in Anderson’s (2008) terrestrial mollusc checklist. It is available to download from the Conchological Society of Great Britain and Ireland.
The following slug species list test indicates changes to Anderson (2008) in red, as a result of recent research including our own. Genera and higher taxa are listed in the same order. As in the 2008 list, GB refers to Great Britain and nearby islands, IRE to the island of Ireland. Species recorded only as adventives (e.g., found in imported produce) but not recorded as breeding populations are not listed.
| CLASS GASTROPODA CUVIER 1795 | |
| ORDER PULMONATA CUVIER IN BLAINVILLE 1814 | |
| FAMILY AGRIOLIMACIDAE H. Wagner 1935 | |
| Genus Deroceras Rafinesque 1820 | |
| Subgenus Deroceras Rafinesque 1820 | |
| Deroceras agreste (Linnaeus 1758) | GB IRE |
| Deroceras invadens Reise, Hutchinson, Schunack & Schlitt, 2011 | GB IRE |
| panormitanum auct. non Lessona & Pollonera 1882 | |
| caruanae (Pollonera 1891) | |
| Deroceras laeve (O. F. Müller 1774) | GB IRE |
| Deroceras panormitanum (Lessona & Pollonera 1882) | GB |
| Deroceras reticulatum (O. F. Müller 1774) | GB IRE |
| FAMILY ARIONIDAE J. E. Gray 1840 | |
| Genus Arion A. Férussac 1819 | |
| Subgenus Arion A. Férussac 1819 | |
| Arion ater (Linnaeus 1758) | GB IRE |
| Arion sp. cf. empiricorum A. Férussac 1819 | GB |
| Arion flagellus Collinge 1893 | GB IRE |
| lusitanicus auct. Brit. non J. Mabille 1868 | |
| Arion rufus (Linnaeus 1758) | GB IRE |
| Arion vulgaris Moquin-Tandon 1855 | GB IRE |
| lusitanicus auct. non J. Mabille 1868 | |
| Arion sp. cf. vulgaris Moquin-Tandon 1855 | GB |
| Subgenus Mesarion P. Hesse 1926 | |
| Arion fuscus (O. F. Müller 1774) | GB IRE |
| Arion sp. cf. iratii Garrido, Castillejo & Iglesias, 1995 | GB |
| Arion subfuscus (Draparnaud 1805) | GB IRE |
| Subgenus Carinarion P. Hesse 1926 | |
| Arion circumscriptus circumscriptus Johnston 1828 | GB IRE |
| Arion circumscriptus silvaticus Lohmander 1937 | GB IRE |
| Arion fasciatus (Nilsson 1823) | GB IRE |
| Subgenus Kobeltia Seibert 1873 | |
| Arion distinctus J. Mabille 1868 | GB IRE |
| hortensis auct. non A. Férussac 1819 | |
| Arion sp. cf. fagophilus de Winter, 1986 | GB |
| Arion hortensis A. Férussac 1819 | GB IRE |
| Arion intermedius Normand 1852 | GB IRE |
| Arion occultus Anderson 2004 | IRE |
| Arion owenii Davies 1979 | GB IRE |
| hortensis auct. non A. Férussac 1819 | |
| Genus Geomalacus Allman 1843 | |
| Subgenus Geomalacus Allman 1843 | |
| Geomalacus maculosus Allman 1843 | IRE |
| FAMILY BOETTGERILLIDAE Wiktor & I. M. Likharev 1979 | |
| Genus Boettgerilla Simroth 1910 | |
| Boettgerilla pallens Simroth 1912 | GB IRE |
| FAMILY LIMACIDAE Lamarck 1801 | |
| Genus Ambigolimax Pollonera, 1887 | |
| Ambigolimax nyctelius (Bourguignat 1861) | GB |
| Ambigolimax valentianus (A. Férussac 1822) | GB IRE |
| Genus Lehmannia Heynemann 1863 | |
| Limax Linnaeus 1758 partim | |
| Lehmannia marginata (O. F. Müller 1774) | GB IRE |
| Genus Limacus Lehmann 1864 | |
| Limax Linnaeus 1758 partim | |
| Limacus flavus (Linnaeus 1758) | GB IRE |
| Limacus maculatus (Kaleniczenko 1851) | GB IRE |
| pseudoflavus (Evans 1978) | |
| Genus Limax Linnaeus 1758 | |
| Limax cinereoniger Wolf 1803 | GB IRE |
| Limax sp. cf. dacampi Menegazzi, 1854 | GB |
| Limax maximus Linnaeus 1758 | GB IRE |
| Genus Malacolimax Malm 1868 | |
| Malacolimax tenellus (O. F. Müller 1774) | GB |
| FAMILY MILACIDAE Ellis 1926 | |
| Genus Milax J. E. Gray 1855 | |
| Milax gagates (Draparnaud 1801) | GB IRE |
| Genus Tandonia Lessona & Pollonera 1882 | |
| Milax J. E. Gray 1855 partim | |
| Tandonia budapestensis (Hazay 1880) | GB IRE |
| Tandonia sp. cf. cristata (Kaleniczenko, 1851) | GB IRE |
| Tandonia rustica (Millet 1843) | GB IRE |
| Tandonia sowerbyi (A. Férussac 1823) | GB IRE |
| FAMILY TESTACELLIDAE J. E. Gray 1840 | |
| Genus Testacella Cuvier 1800 | |
| Subgenus Testacella Cuvier 1800 | |
| Testacella haliotidea Draparnaud 1801 | GB IRE |
| Testacella maugei A. Férussac 1819 | GB IRE |
| Testacella scutulum Sowerby 1821 | GB |
| Testacella sp. cf. scutulum Sowerby 1821 | GB IRE |
| FAMILY TRIGONOCHLAMYDIDAE P. Hesse 1832 | |
| Genus Selenochlamys O. Boettger 1883 | |
| Selenochlamys ysbryda Rowson & Symondson 2008 | GB |
| FAMILY VITRINIDAE Fitzinger 1833 | |
| Genus Phenacolimax Stabile 1859 | |
| Phenacolimax major (A. Férussac 1807) | GB |
| Genus Semilimax Stabile 1859 | |
| Semilimax pyrenaicus (A. Férussac 1821) | IRE |
| Genus Vitrina Draparnaud 1801 | |
| Vitrina pellucida (O. F. Müller 1774) | GB IRE |