| Family Scyllaeidae |
| Scyllaea Linnaeus, 1758 |
| Scyllaea pelagica Linnaeus, 1758 |
| Family Hancockiidae |
| Hancockia Gosse, 1877 |
| Hancockia uncinata (Hesse, 1872) |
| Family Dendronotidae |
| Dendronotus Alder & Hancock, 1845 |
| Dendronotus frondosus (Ascanius, 1774) |
| Family Dotidae |
| Doto Oken, 1815 |
| Doto coronata (Gmelin, 1791) |
| Doto cuspidata Alder & Hancock, 1862 |
| Doto dunnei Lemche, 1976 |
| Doto eireana Lemche, 1976 |
| Doto fragilis (Forbes, 1838) |
| Doto hydrallmaniae Morrow, Thorpe & Picton, 1992 |
| Doto hystrix Picton & Brown, 1981 |
| Doto koenneckeri Lemche, 1976 |
| Doto lemchei Ortea & Urgorri, 1978 |
| Doto maculata (Montagu, 1804) |
| Doto millbayana Lemche, 1976 |
| Doto onusta Hesse, 1872 |
| Doto pinnatifida (Montagu, 1804) |
| Doto sarsiae Morrow, Thorpe & Picton, 1992 |
| Doto tuberculata Lemche, 1976 |
| Family Embletoniidae |
| Embletonia Alder & Hancock, 1851 |
| Embletonia pulchra (Alder & Hancock, 1844) |
| Family Flabellinidae |
| Coryphella J E Gray in M E Gray, 1850 |
| Coryphella browni Picton, 1980 |
| Coryphella gracilis (Alder & Hancock, 1844) |
| Coryphella lineata (Lovén, 1846) |
| Coryphella verrucosa (M Sars, 1829) |
| Flabellina Voigt, 1834 |
| Flabellina pedata (Montagu, 1815) |
| Flabellina pellucida (Alder & Hancock, 1843) |
| Family Tergipedidae |
| Tergipes Cuvier, 1805 |
| Tergipes tergipes (Forsskĺl, 1775) |
| Catriona Winckworth, 1941 |
| Catriona gymnota (Couthouy, 1838) |
| Cuthona Alder & Hancock, 1855 |
| Cuthona amoena (Alder & Hancock, 1845) |
| Cuthona caerulea (Montagu, 1804) |
| Cuthona concinna (Alder & Hancock, 1843) |
| Cuthona foliata (Forbes & Goodsir, 1839) |
| Cuthona genovae (O'Donoghue, 1926) |
| Cuthona nana (Alder & Hancock, 1842) |
| Cuthona pustulata (Alder & Hancock, 1854) |
| Cuthona rubescens Picton & Brown, 1978 |
| Cuthona viridis (Forbes, 1840) |
| Tenellia A Costa, 1866 |
| Tenellia adspersa (Nordmann, 1844) |
| Family Eubranchidae |
| Eubranchus Forbes, 1838 |
| Eubranchus doriae (Trinchese, 1874) |
| Eubranchus exiguus (Alder & Hancock, 1848) |
| Eubranchus farrani (Alder & Hancock, 1844) |
| Eubranchus pallidus (Alder & Hancock, 1842) |
| Eubranchus tricolor Forbes, 1838 |
| Eubranchus vittatus (Alder & Hancock, 1842) |
| Eubranchus sp. |
| Family Cumanotidae |
| Cumanotus Odhner, 1907 |
| Cumanotus beaumonti (Eliot, 1906) |
| Family Fionidae |
| Fiona Alder & Hancock in Forbes & Hanley, 1851 |
| Fiona pinnata (Eschscholtz, 1831) |
| Family Calmidae |
| Calma Alder & Hancock, 1855 |
| Calma glaucoides (Alder & Hancock, 1854) |
| Family Pseudovermidae |
| Pseudovermis Periaslavzeff, 1891 |
| Pseudovermis boadeni Salvini-Plawen & Sterrer, 1968 |
| Family Facelinidae |
| Facelina Alder & Hancock, 1855 |
| Facelina annulicornis (Chamisso & Eysenhardt, 1821) |
| Facelina auriculata (O F Müller, 1776) |
| Facelina bostoniensis (Couthouy, 1838) |
| Facelina dubia Pruvot-Fol, 1949 |
| Caloria Trinchese, 1888 |
| Caloria elegans (Alder & Hancock, 1845) |
| Family Favorinidae |
| Favorinus J E Gray, 1850 |
| Favorinus blianus Lemche & Thompson, 1974 |
| Favorinus branchialis (Rathke, 1806) |
| Dicata Schmekel, 1967 |
| Dicata odhneri Schmekel, 1967 |
| Family Aeolidiidae |
| Aeolidia Cuvier, 1798 |
| Aeolidia papillosa (Linnaeus, 1761) |
| Aeolidiella Bergh, 1867 |
| Aeolidiella alderi (Cocks, 1852) |
| Aeolidiella glauca (Alder & Hancock, 1845) |
| Aeolidiella sanguinea (Norman, 1877) |