Abronica abronia (MacFarland, 1966)
Abronica purpureoanulata (Baba, 1961)
Abronica sp.
Acanthodoris brunnea MacFarland, 1905
Acanthodoris hudsoni MacFarland, 1905
Acanthodoris lutea MacFarland, 1925
Acanthodoris nanaimoensis O'Donoghue, 1921
Acanthodoris pilosa (Abildgaard in Mueller, 1789)
Acanthodoris planca Fahey & Valdés, 2005
Acanthodoris rhodoceras Cockerell & Eliot, 1905
Actinocyclus verrucosus Ehrenberg, 1831
Adalaria olgae Martynov, Korshunova, Sanamyan & Sanamyan, 2009
Adalaria proxima (Alder & Hancock, 1854)
Adalaria slavi Martynov, Korshunova, Sanamyan & Sanamyan, 2009
Aegires albopunctatus Macfarland, 1905
Aegires exeches Fahey & Gosliner, 2004
Aegires flores Fahey and Gosliner, 2004
Aegires hapsis Fahey and Gosliner, 2004
Aegires incusus Fahey and Gosliner, 2004
Aegires petalis Fahey & Gosliner, 2004
Aegires pruvotfolae Fahey & Gosliner, 2004
Aegires punctilucens (d'Orbigny, 1837)
Aegires sp.
Aegires villosus Farran, 1905
Aeolidia loui Kienberger, Carmona, Pola, Padula, Gosliner & Cervera, 2016
Aeolidia papillosa (Linnaeus, 1761)
Aeolidia sp.
Aeolidiella alba Risbec, 1928
Aeolidiella alderi (Cocks, 1852)
Aeolidiella chromosoma (Cockerell in Cockerell & Eliot, 1905)
Aeolidiella glauca (Alder & Hancock, 1845)
Aeolidiella oliviae MacFarland, 1966
Aeolidiella sanguinea (Norman, 1877)
Aeolidiopsis ransoni Pruvot-Fol, 1956
Aglaja ocelligera (Bergh 1893)
Aglaja orientalis Baba, 1949
Aglaja sp.
Aglaja tricolorata Renier, 1807
Aldisa albatrossae Elwood, Vald
Aldisa andersoni Gosliner & Behrens, 2004
Aldisa cooperi Robilliard & Baba, 1972
Aldisa erwinkoehleri Perrone, 2001
Aldisa fragaria Tibiriçá, Pola & Cervera, 2017
Aldisa pikokai Bertsch & S. Johnson, 1982
Aldisa sanguinea (Cooper, 1873)
Aldisa smaragdina Ortea, Perez & Llera, 1982
Aldisa sp.
Aldisa tara Millen in Millen & Gosliner, 1985
Aldisa trimaculata Gosliner in Millen & Gosliner, 1985
Aldisa williamsi Elwood, Valdés & Gosliner, 2000
Aliculastrum cylindricum (Helbling, 1779)
Aliculastrum sp.
Alloiodoris lanuginata (Abraham, 1877)
Alloiodoris marmorata Bergh, 1904
Analogium amakusanum Baba, 1996
Analogium sp.
Ancula gibbosa (Risso, 1818)
Ancula mapae Burn, 1961
Ancula pacifica MacFarland, 1905
Ancula sp.
Anetarca armata Gosliner, 1991
Anteaeolidiella chromosoma (T. D. A. Cockerell & Eliot, 1905)
Anteaeolidiella foulisi (Angas, 1864)
Anteaeolidiella oliviae (MacFarland, 1966)
Antiopella barbarensis (Cooper, 1863)
Antiopella capensis (Bergh, 1907)
Antiopella cristata (Delle Chiaje, 1841)
Antiopella fusca (O'Donoghue, 1924)
Antiopella longidentata (Gosliner, 1981)
Antonietta janthina Baba & Hamatani, 1977
Antonietta sp.
Apata pricei (MacFarland, 1966)
Aphelodoris berghi Odhner, 1924
Aphelodoris brunnea Bergh, 1907
Aphelodoris gigas Wilson, 2003
Aphelodoris karpa Wilson, 2003
Aphelodoris luctuosa (Cheeseman, 1882)
Aphelodoris sp.
Aphelodoris varia (Abraham, 1877)
Aplysia brasiliana Rang, 1828
Aplysia californica Cooper, 1863
Aplysia cedrosensis Eales, 1960
Aplysia dactylomela Rang, 1828
Aplysia depilans Gmelin, 1791
Aplysia extraordinaria (Allan, 1932)
Aplysia fasciata Poiret, 1789
Aplysia gigantea Sowerby, 1869
Aplysia juliana Quoy & Gaimard, 1832
Aplysia keraudreni Rang, 1828
Aplysia kurodai (Baba, 1937)
Aplysia nigrocincta E. von Martens, 1880
Aplysia oculifera (Adams & Reeve, 1850)
Aplysia parvula Guilding in Morch, 1863
Aplysia punctata Cuvier, 1803
Aplysia sowerbyi Pilsbry, 1895
Aplysia sp.
Aplysia vaccaria Winkler, 1955
Aplysiopsis sinusmensalis (Macnae, 1954)
Archidoris pseudoargus (Rapp, 1827)
Archidoris wellingtonensis (Abraham, 1877)
Ardeadoris averni (Rudman, 1985)
Ardeadoris carlsoni (Rudman, 1986)
Ardeadoris cruenta (Rudman, 1986)
Ardeadoris egretta Rudman, 1984
Ardeadoris electra (Rudman, 1990)
Ardeadoris poliahu (Bertsch & Gosliner, 1989)
Ardeadoris pullata (Rudman, 1995)
Ardeadoris rubroannulata (Rudman, 1986)
Ardeadoris scottjohnsoni Bertsch & Gosliner, 1989
Ardeadoris sp.
Ardeadoris symmetrica (Rudman, 1990)
Ardeadoris tomsmithi (Bertsch & Gosliner, 1989)
Ardeadoris undaurum (Rudman, 1985)
Armina californica (Cooper, 1863)
Armina comta (Bergh, 1880)
Armina gilchristi White, 1955
Armina maculata Rafinesque, 1814
Armina magna Baba, 1955
Armina major Baba, 1949
Armina scotti Mehrotra, Caballer & Chavanich, 2017
Armina semperi (Bergh, 1861)
Armina sp.
Armina tigrina Rafinesque, 1814
Ascobulla fisheri (A. Adams & Angas, 1864)
Asteronotus sp.
Asteronotus cespitosus (van Hasselt, 1824)
Asteronotus hepaticus
Asteronotus mimeticus Gosliner & Valdes, 2002
Asteronotus spongicolus Gosliner & Valdes, 2002
Atagema alba (O'Donoghue, 1927)
Atagema echinata (Pease, 1860)
Atagema intecta (Kelaart, 1858)
Atagema ornata (Ehrenberg, 1831)
Atagema osseosa (Kelaart, 1859)
Atagema rugosa Pruvot-Fol, 1951
Atagema sp.
Atagema spongiosa (Kelaart, 1858)
Atagema tristis (Alder & Hancock, 1864)
Atalodoris jannae (Millen, 1987)
Atys cylindricus Helbling, 1779
Atys debilis Pease, 1871
Atys multistriatus Schepman, 1913
Atys naucum (Linnaeus, 1758)
Atys semistriatus Pease, 1860
Auriculastrum sp.
Austraeolis catina Marcus & Marcus, 1967
Austraeolis ornata (Angas, 1864)
Austraeolis stearnsi (Cockerell, 1901)
Austrodoris kerguelenensis (Bergh, 1884)