• Acanthopsole lugubris Bergh, 1882 accepted as Facelina lugubris (Bergh, 1882)
• Acanthopsole pselliotes Labbé, 1923 accepted as Pruvotfolia pselliotes (Labbé, 1923)
• Acanthopsole quatrefagesi Vayssière, 1888 accepted as Caloria quatrefagesi (Vayssière, 1888)
• Acanthopsole schwobi Labbé, 1923 accepted as Facelina schwobi (Labbé, 1923)
• Acanthopsole vicina Bergh, 1882 accepted as Facelina vicina (Bergh, 1882)
• Aeolidia campbellii (Cunningham, 1871)
• Aeolidia filomenae Kienberger, Carmona, Pola, Padula, Gosliner & Cervera, 2016
• Aeolidia papillosa (Linnaeus, 1761)
• Aeolidia papillosa var. pacifica Bergh, 1879 accepted as Aeolidia papillosa (Linnaeus, 1761)
• Aeolidia serotina Bergh, 1873 accepted as Aeolidia campbellii (Cunningham, 1871)
• Aeolidiella alderi (Cocks, 1852)
• Aeolidiella croisicensis Labbé, 1923 accepted as Spurilla croisicensis (Labbé, 1923)
• Aeolidiella glauca (Alder & Hancock, 1845)
• Aeolidiella lurana Marcus & Marcus, 1967 accepted as Anteaeolidiella lurana (Ev. Marcus & Er. Marcus, 1967)
• Aeolidiella rubra (Cantraine, 1835)
• Aeolidiella sanguinea (Norman, 1877)
• Aeolidiella soemmeringii Bergh, 1882 accepted as Aeolidiella alderi (Cocks, 1852)
• Aeolis argenteolineata A. Costa, 1866 accepted as Coryphella lineata (Lovén, 1846)
• Aeolis bellula Lovén, 1846 accepted as Catriona aurantia (Alder & Hancock, 1842)
• Aeolis digitata A. Costa, 1866 accepted as Calmella cavolini (Vérany, 1846)
• Aeolis lesliana MacGillivray, 1843 accepted as Aeolidia papillosa (Linnaeus, 1761)
• Aeolis lineata Lovén, 1846 accepted as Coryphella lineata (Lovén, 1846)
• Aeolis murrayana MacGillivray, 1843 accepted as Aeolidia papillosa (Linnaeus, 1761)
• Aeolis neglecta Lovén, 1846 accepted as Tergipes tergipes (Forsskål, 1775)
• Aeolis rubrovittata A. Costa, 1866 accepted as Facelina rubrovittata (A. Costa, 1866)
• Algarvia alba García-Gómez & Cervera, 1989
• Amphitrite frondosa Ascanius, 1774 accepted as Dendronotus frondosus (Ascanius, 1774)
• Amphorina alberti Quatrefages, 1844 accepted as Amphorina farrani (Alder & Hancock, 1844)
• Amphorina alberti var. leopardina Vayssière, 1888 accepted as Cuthona leopardina (Vayssière, 1888)
• Amphorina andra Korshunova, Malmberg, Prkic, Petani, Fletcher, Lundin & Martynov, 2020
• Amphorina farrani (Alder & Hancock, 1844)
• Amphorina linensis (García-Gómez, Cervera & F. J. Garcia, 1990)
• Amphorina odhneri (Derjugin & Gurjanova, 1926) accepted as Eubranchus odhneri (Derjugin & Gurjanova, 1926)
• Amphorina pallida (Alder & Hancock, 1842)
• Amphorina viriola Korshunova, Malmberg, Prkic, Petani, Fletcher, Lundin & Martynov, 2020
• Anteaeolidiella lurana (Ev. Marcus & Er. Marcus, 1967)
• Antiopa hyalina Alder & Hancock, 1854 accepted as Janolus hyalinus (Alder & Hancock, 1854)
• Antiopa splendida Alder & Hancock, 1848 accepted as Antiopella cristata (Delle Chiaje, 1841)
• Antiopella cristata (Delle Chiaje, 1841)
• Antonietta luteorufa Schmekel, 1966
• Armina loveni (Bergh, 1866)
• Armina maculata Rafinesque, 1814
• Armina neapolitana (Delle Chiaje, 1824)
• Armina quadrilateralis (Bergh, 1861) (uncertain > taxon inquirendum)
• Armina tigrina Rafinesque, 1814
• Armina tricuspidata T. E. Thompson, Cattaneo & Wong, 1990
• Atthila ingolfiana Bergh, 1899
• Babakina anadoni (Ortea, 1979)
• Baenopsis baetica (García-Gómez, 1984)
• Baeolidia cryoporos Bouchet, 1977
• Baeolidia nodosa (Haefelfinger & Stamm, 1958) accepted as Limenandra nodosa Haefelfinger & Stamm, 1958
• Berghia coerulescens (Laurillard, 1832)
• Berghia columbina (García-Gómez & T. E. Thompson, 1990)
• Berghia marinae Carmona, Pola, Gosliner & Cervera, 2014
• Berghia modesta Trinchese, 1882 accepted as Berghia coerulescens (Laurillard, 1832)
• Berghia norvegica Odhner, 1939
• Berghia rissodominguezi Muniain & Ortea, 1999
• Berghia verrucicornis (A. Costa, 1867)
• Boopsis mediterranea Pierantoni, 1923 accepted as Cephalopyge trematoides (Chun, 1889)
• Borealea nobilis (A. E. Verrill, 1880) accepted as Coryphella nobilis A. E. Verrill, 1880
• Calma glaucoides (Alder & Hancock, 1854)
• Calma gobioophaga Calado & Urgorri, 2002
• Calmella cavolini (Vérany, 1846)
• Calmella gaditana (Cervera, García-Gómez & F. J. García, 1987)
• Calmella sphaerifera Schmekel, 1965 accepted as Piseinotecus sphaeriferus (Schmekel, 1965)
• Caloria elegans (Alder & Hancock, 1845)
• Caloria indica (Bergh, 1896)
• Caloria maculata Trinchese, 1888
• Caloria quatrefagesi (Vayssière, 1888)
• Candiella ingolfiana Bergh, 1899 accepted as Tritonia ingolfiana (Bergh, 1899)
• Candiella villafranca Vayssière, 1901 accepted as Tritonia manicata Deshayes, 1853 accepted as Duvaucelia manicata (Deshayes, 1853)
• Capellinia doriae Trinchese, 1874
• Capellinia fustifera (Lovén, 1846)
• Carronella pellucida (Alder & Hancock, 1843)
• Catriona aurantia (Alder & Hancock, 1842)
• Catriona gymnota (Couthouy, 1838)
• Catriona maua Ev. Marcus & Er. Marcus, 1960
• Catriona perca Er. Marcus, 1958 accepted as Cuthona perca (Er. Marcus, 1958)
• Cavolina rubra Cantraine, 1835 accepted as Aeolidiella rubra (Cantraine, 1835)
• Cephalopyge trematoides (Chun, 1889)
• Cerberilla bernadettae J. Tardy, 1965
• Cerberilla bernadetti J. Tardy, 1965 accepted as Cerberilla bernadettae J. Tardy, 1965
• Cloelia formosa Lovén, 1844 accepted as Hero formosa (Lovén, 1844)
• Coryphella beaumonti Eliot, 1906 accepted as Cumanotus beaumonti (Eliot, 1906)
• Coryphella borealis Odhner, 1922
• Coryphella browni Picton, 1980
• Coryphella chriskaugei (Korshunova, Martynov, Bakken, Evertsen, Fletcher, Mudianta, Saito, Lundin, Schrödl & Picton, 2017)
• Coryphella dushia Ev. Marcus & Er. Marcus, 1963 accepted as Flabellina dushia (Ev. Marcus & Er. Marcus, 1963)
• Coryphella gracilis (Alder & Hancock, 1844)
• Coryphella insolita (García-Gómez & Cervera, 1989)
• Coryphella islandica Odhner, 1937 accepted as Paracoryphella islandica (Odhner, 1937)
• Coryphella lineata (Lovén, 1846)
• Coryphella nobilis A. E. Verrill, 1880
• Coryphella parva M. Hadfield, 1963 accepted as Paracoryphella parva (M. Hadfield, 1963)
• Coryphella pedata (Montagu, 1816) accepted as Edmundsella pedata (Montagu, 1816)
• Coryphella robusta Trinchese, 1874 accepted as Flabellina verrucosa (M. Sars, 1829) accepted as Coryphella verrucosa (M. Sars, 1829)
• Coryphella rufibranchialis (G. Johnston, 1832) accepted as Flabellina verrucosa (M. Sars, 1829) accepted as Coryphella verrucosa (M. Sars, 1829)
• Coryphella rufibranchialis chocolata Balch, 1908 accepted as Flabellina verrucosa (M. Sars, 1829) accepted as Coryphella verrucosa (M. Sars, 1829)
• Coryphella rufibranchialis var. clavigera Odhner, 1929 accepted as Microchlamylla gracilis (Alder & Hancock, 1844) accepted as Coryphella gracilis (Alder & Hancock, 1844)
• Coryphella rutila Verrill, 1879 accepted as Carronella pellucida (Alder & Hancock, 1843)