• “Montereina” concinna (Alder & Hancock, 1864) represented as Discodoris concinna (Alder & Hancock, 1864)
• Acanthodoris pilosa (Abildgaard, 1789)
• Actaeopyramis eximia (Lischke, 1872) accepted as Monotygma eximia (Lischke, 1872)
• Acteocina (Truncacteocina) oyamai Kuroda & Habe, 1954 accepted as Truncacteocina oyamai (Kuroda & Habe, 1954) accepted as Truncacteocina arata (R. B. Watson, 1883)
• Acteocina biplex (A. Adams, 1850) accepted as Truncacteocina biplex (A. Adams, 1850)
• Acteocina coarctata (A. Adams, 1850) accepted as Truncacteocina coarctata (A. Adams, 1850)
• Acteocina decorata (Pilsbry, 1904)
• Acteocina eumicra (Crosse, 1865)
• Acteocina exilis (Dunker, 1860)
• Acteocina fusiformis (A. Adams, 1850)
• Acteocina gordonis (Yokoyama, 1927)
• Acteocina gracilis (A. Adams, 1850)
• Acteocina nanshanensis G.-Y. Lin, 1991
• Acteocina orientalis G.-Y. Lin, 1983
• Acteocina simplex (A. Adams, 1850)
• Acteon secale A. Gould, 1859
• Acteon teramachii Habe, 1950 accepted as Punctacteon teramachii (Habe, 1950)
• Adamnestia tosaensis Habe, 1954 accepted as Cylichna rimata A. Adams, 1862
• Aegires villosus Farran, 1905
• Aeolidia papillosa (Linnaeus, 1761)
• Aeolidiella albopunctata G.-Y. Lin, 1992
• Aeolidiella takanosimensis Baba, 1930 accepted as Anteaeolidiella takanosimensis (Baba, 1930)
• Alderia modesta (Lovén, 1844)
• Alderiopsis nigra (Baba, 1937)
• Aldisa cooperi Robilliard & Baba, 1972
• Aldisa sanguinea (J. G. Cooper, 1863)
• Aldisa sanguinea cooperi Robilliard & Baba, 1972 accepted as Aldisa cooperi Robilliard & Baba, 1972
• Aliculastrum cylindricum (Helbling, 1779)
• Aliculastrum volvulina (A. Adams, 1862)
• Amathina tricarinata (Linnaeus, 1767)
• Anteaeolidiella takanosimensis (Baba, 1930)
• Aplustrum amplustre (Linnaeus, 1758) represented as Hydatina amplustre (Linnaeus, 1758)
• Aplysia argus Rüppell & Leuckart, 1830
• Aplysia cornigera G. B. Sowerby II, 1869
• Aplysia dactylomela Rang, 1828
• Aplysia juliana Quoy & Gaimard, 1832
• Aplysia kurodai Baba, 1937
• Aplysia oculifera A. Adams & Reeve, 1850
• Aplysia parvula Mörch, 1863
• Aplysia pulmonica Gould, 1852
• Aplysia sagamiana Baba, 1949
• Argus laminea (Risbec, 1928) accepted as Discodoris laminea (Risbec, 1928)
• Armina appendiculata Baba, 1949
• Armina babai (S. Tchang, 1934)
• Armina bilamella G.Y. Lin, 1981
• Armina comta (Bergh, 1880)
• Armina japonica (Eliot, 1913)
• Armina longicauda G.Y. Lin, 1981
• Armina magna Baba, 1955
• Armina major Baba, 1949
• Armina papillata Baba, 1933
• Armina punctilopsis G.-Y. Lin, 1992
• Armina punctilucens (Bergh, 1874)
• Armina punctulata G.-Y. Lin, 1990
• Armina sinensis G.Y. Lin, 1981
• Armina variolosa (Bergh, 1904)
• Asteronotus cespitosus (van Hasselt, 1824)
• Atagema spongiosa (Kelaart, 1858)
• Atys naucum (Linnaeus, 1758)
• Austraeolis ornata (Angas, 1864)
• Baeolidia fusiformis Baba, 1949 accepted as Limenandra fusiformis (Baba, 1949)
• Biuve fulvipunctata (Baba, 1938)
• Boasia chierchiae (Boas, 1886)
• Bornella digitata A. Adams & Reeve, 1850 accepted as Bornella stellifera (A. Adams & Reeve, 1848)
• Bornella hermanni Angas, 1864
• Bornella japonica Baba, 1949 accepted as Bornella hermanni Angas, 1864
• Bornella stellifera (A. Adams & Reeve, 1848)
• Brachystomia omaensis (Nomura, 1938)
• Bulla adamsi Menke, 1850 (uncertain > nomen dubium)
• Bulla ampulla Linnaeus, 1758
• Bulla difficilis Habe, 1950
• Bulla punctulata A. Adams, 1850
• Bulla vernicosa A. Gould, 1859
• Bullacta caurina (W. H. Benson, 1842)
• Bullacta exarata (R. A. Philippi, 1849) accepted as Bullacta caurina (W. H. Benson, 1842)
• Bullina lineata (Gray, 1825)
• Bullina nobilis Habe, 1950
• Bullina truncatula G.Y. Lin, 1989
• Cadlina japonica Baba, 1937
• Cadlina sagamiensis Baba, 1937 accepted as Showajidaia sagamiensis (Baba, 1937)
• Cadlinella sagamiensis (Baba, 1937) accepted as Showajidaia sagamiensis (Baba, 1937)
• Caloria indica (Bergh, 1896)
• Casella atromarginata (Cuvier, 1804) accepted as Doriprismatica atromarginata (Cuvier, 1804)
• Cassidula nucleus (Gmelin, 1791)
• Cassidula paludosa (Garrett, 1872)
• Cassidula paludosa nigrobrunnea Pilsbry & Y. Hirase, 1905
• Catriona ornata (Baba, 1937) accepted as Cuthona ornata Baba, 1937 accepted as Trinchesia ornata (Baba, 1937)
• Cavolinia gibbosa (d'Orbigny, 1835)
• Cavolinia globulosa Gray, 1850
• Cavolinia longirostris (Blainville, 1821) accepted as Diacavolinia longirostris (Blainville, 1821)
• Cavolinia tridentata (Forsskål, 1775)
• Cavolinia uncinata (d'Orbigny, 1835)
• Ceratosoma cornigerum A. Adams & Reeve, 1850 accepted as Ceratosoma trilobatum (J. E. Gray, 1850)
• Ceratosoma trilobatum (J. E. Gray, 1850)
• Cerberilla albopunctata Baba, 1976
• Cerberilla asamusiensis Baba, 1940
• Chelidonura fulvipunctata Baba, 1938 accepted as Biuve fulvipunctata (Baba, 1938)
• Chelidonura hirundinina (Quoy & Gaimard, 1833)
• Chelidonura inornata Baba, 1949 accepted as Mariaglaja inornata (Baba, 1949)
• Chelidonura tsurugensis Baba & Abe, 1959 accepted as Mariaglaja tsurugensis (Baba & Abe, 1959)