• “Montereina” concinna (Alder & Hancock, 1864) represented as Discodoris concinna (Alder & Hancock, 1864)
• “Montereina” erubescens (Bergh, 1884) represented as Discodoris erubescens Bergh, 1884
• “Montereina” punctifera (Abraham, 1877) represented as Peltodoris punctifera (Abraham, 1877)
• Acanthodoris citrina A. E. Verrill, 1879 accepted as Acanthodoris pilosa (Abildgaard, 1789)
• Acanthodoris ornata A. E. Verrill, 1879 accepted as Acanthodoris pilosa (Abildgaard, 1789)
• Acanthodoris pilosa (Abildgaard, 1789)
• Acanthodoris pilosa var. albescens Bergh, 1880 accepted as Acanthodoris pilosa (Abildgaard, 1789)
• Acanthodoris pilosa var. novaezealandiae Bergh, 1905 accepted as Acanthodoris pilosa (Abildgaard, 1789)
• Acanthodoris pilosa var. pallida Bergh, 1905 accepted as Acanthodoris pilosa (Abildgaard, 1789)
• Acanthodoris pilosa var. purpurea Bergh, 1880 accepted as Acanthodoris pilosa (Abildgaard, 1789)
• Acanthodoris subquadrata (Alder & Hancock, 1845) accepted as Acanthodoris pilosa (Abildgaard, 1789)
• 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)
• Adalaria loveni (Alder & Hancock, 1862)
• Adalaria proxima (Alder & Hancock, 1854)
• Adalaria rossica Martynov & Korshunova, 2017
• Aegires incisus (G. O. Sars, 1872)
• Aegires leuckartii Vérany, 1853
• Aegires palensis Ortea, Luque & Templado, 1990
• Aegires punctilucens (d'Orbigny, 1837)
• Aegires sublaevis Odhner, 1932
• Aegirus hispidus Hesse, 1872 accepted as Aegires punctilucens (d'Orbigny, 1837)
• 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)
• Aldisa banyulensis Pruvot-Fol, 1951
• Aldisa barlettai Ortea & Ballesteros, 1989
• Aldisa berghi Vayssière, 1901 accepted as Doris ocelligera (Bergh, 1881)
• Aldisa binotata Pruvot-Fol, 1953
• Aldisa expleta Ortea, Pérez & Llera, 1982
• Aldisa puntallanensis Moro & Ortea, 2011
• Aldisa smaragdina Ortea, Pérez & Llera, 1982
• Aldisa zetlandica (Alder & Hancock, 1854)
• 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
• Ancula gibbosa (Risso, 1818)
• Ancula pacifica MacFarland, 1905
• Ancula sulphurea W. Stimpson, 1853 accepted as Ancula gibbosa (Risso, 1818)
• Anisodoris marmorata (Bergh, 1881)
• 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
• Aporodoris millegrana (Alder & Hancock, 1854)
• Archidoris maculata (Garstang, 1896) accepted as Doris sticta (Iredale & O'Donoghue, 1923)
• Archidoris maculata var. lutea Vayssière, 1919 accepted as Doris sticta (Iredale & O'Donoghue, 1923)
• Archidoris marmorata Bergh, 1881 accepted as Anisodoris marmorata (Bergh, 1881)
• Archidoris pseudoargus (Rapp, 1827) accepted as Doris pseudoargus Rapp, 1827
• Archidoris stellifera Vayssière, 1903 accepted as Discodoris stellifera (Vayssière, 1903)
• Archidoris tuberculata (Müller, 1778) sensu Cuvier, 1804 accepted as Doris pseudoargus Rapp, 1827
• 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
• Atagema gibba Pruvot-Fol, 1951
• Atagema rugosa Pruvot-Fol, 1951
• Atalodoris albonigra (Pruvot-Fol, 1951) accepted as Atalodoris pusilla (Alder & Hancock, 1845)
• Atalodoris bouvieri (Vayssière, 1919) accepted as Idaliadoris bouvieri (Vayssière, 1919)
• Atalodoris cervinoi (Ortea & Urgorri, 1979) accepted as Idaliadoris cervinoi (Ortea & Urgorri, 1979)
• Atalodoris depressa (Alder & Hancock, 1842) accepted as Idaliadoris depressa (Alder & Hancock, 1842)
• Atalodoris inconspicua (Alder & Hancock, 1851)
• Atalodoris neapolitana (Delle Chiaje, 1841) accepted as Idaliadoris neapolitana (Delle Chiaje, 1841)
• Atalodoris oblonga (Alder & Hancock, 1845)
• Atalodoris pusilla (Alder & Hancock, 1845)
• Atalodoris reticulata (Ortea, 1979)
• Atalodoris sparsa (Alder & Hancock, 1846)
• Atalodoris tridactila (Ortea & Ballesteros, 1982) accepted as Idaliadoris tridactila (Ortea & Ballesteros, 1982)
• Atthila ingolfiana Bergh, 1899
• Babakina anadoni (Ortea, 1979)