| Castrella (Castrella) truncata (Abildgaard, 1789) | 1936 or earlier | | | |
| Rhynchodemus scharffi Graff, 1896 | 1901 or earlier | | | |
| Dolichoplana feildeni Graff, 1899 | 1911 or earlier | | | |
| Rhynchomesostoma rostratum (Müller, 1774) | 1936 or earlier | | | |
| Mesostoma ehrenbergii (Focke, 1836) | 1936 or earlier | | | |
| Prorhynchus stagnalis Schultze, 1851 | 1936 or earlier | | | Irland |
| Geocentrophora sphyrocephala de Man, 1876 | 1936 or earlier | | | |
| Planaria torva (Müller, 1773) | 1981 or earlier | | | found in England, Scotland and Ireland. ....its distribution is markedly discontinuous, there being real concentrations in the Edinburgh and Glasgow areas and in East Anglica. |
| Bipalium kewense Moseley, 1878 | 1981 or earlier | | | it is generally associated with exotic plants of greenhouses |
| Microplana terrestris (Müller, 1773) | 1944 and earlier | | | It is widely distributed in Britain and Ireland under logs, stones, decaying wood, etc. lying in dark shady places |
| Artioposthia exulans (Dendy, 1901) | 2021 or earlier | | | |
| Bipalium kewense Moseley, 1878 | 2021 or earlier | | | |
| Arthurdendyus triangulatus (Dendy, 1895) | | | | |