• Aartsenia candida (Møller, 1842)
• Acanthodoris pilosa (Abildgaard, 1789)
• Acanthodoris subquadrata (Alder & Hancock, 1845) accepted as Acanthodoris pilosa (Abildgaard, 1789)
• Acteocina bidentata (A. d'Orbigny, 1841) accepted as Cylichnella bidentata (A. d'Orbigny, 1841)
• Acteocina canaliculata (Say, 1826)
• Acteocina oryza (Totten, 1835) accepted as Cylichnella oryza (Totten, 1835)
• Acteon melampoides Dall, 1881
• Adalaria proxima (Alder & Hancock, 1854)
• Aeolidia papillosa (Linnaeus, 1761)
• Alderia modesta (Lovén, 1844)
• Aldisa zetlandica (Alder & Hancock, 1854)
• Amphorina pallida (Alder & Hancock, 1842)
• Ancula gibbosa (Risso, 1818)
• Aplysia brasiliana Rang, 1828
• Aplysia fasciata Poiret, 1789
• Aplysia morio (A. E. Verrill, 1901)
• Aplysia willcoxi Heilprin, 1887 accepted as Aplysia fasciata Poiret, 1789
• Asperspina riseri (M. P. Morse, 1976)
• Auriculinella bidentata (Montagu, 1808) accepted as Leucophytia bidentata (Montagu, 1808)
• Berthella americana (A. E. Verrill, 1885)
• Boonea bisuturalis (Say, 1822)
• Boonea impressa (Say, 1822)
• Boonea seminuda (C. B. Adams, 1839)
• Boonea trifida (Totten, 1834) accepted as Boonea bisuturalis (Say, 1822)
• Borealea nobilis (A. E. Verrill, 1880) accepted as Coryphella nobilis A. E. Verrill, 1880
• Bulla gemma (A. E. Verrill, 1880) accepted as Roxania semilaevis (G. Seguenza, 1880)
• Cadlina laevis (Linnaeus, 1767)
• Cadlina luteomarginata MacFarland, 1966
• Cadlina marginata MacFarland, 1905 accepted as Cadlina luteomarginata MacFarland, 1966
• Cariopsilla pharpa (Er. Marcus, 1961) accepted as Doriopsilla pharpa Er. Marcus, 1961
• Carronella pellucida (Alder & Hancock, 1843)
• Catriona gymnota (Couthouy, 1838)
• Cavolinia gibbosa (A. d'Orbigny, 1835)
• Cavolinia inflexa (Lesueur, 1813)
• Cavolinia longirostris (Blainville, 1821) accepted as Diacavolinia longirostris (Blainville, 1821)
• Cavolinia tridentata (Forsskål, 1775)
• Cavolinia uncinata (A. d'Orbigny, 1835)
• Chrysallida cancellata (A. d'Orbigny, 1841)
• Chrysallida dux (Dall & Bartsch, 1906)
• Clio cuspidata (Bosc, 1801)
• Clio polita Pelseneer, 1888
• Clio pyramidata Linnaeus, 1767
• Clio recurva (Children, 1823)
• Clione limacina (Phipps, 1774)
• Colga pacifica (Bergh, 1894)
• Colga ramosa (A. E. Verrill & Emerton, 1881)
• Colga villosa (Odhner, 1907)
• Corambe obscura (A. E. Verrill, 1870)
• Corolla spectabilis Dall, 1871
• Coryphella gracilis (Alder & Hancock, 1844)
• Coryphella nobilis A. E. Verrill, 1880
• Coryphella verrucosa (M. Sars, 1829)
• Cratena pilata (A. Gould, 1870)
• Crenilabium exile (Jeffreys, 1870)
• Creseis acicula (Rang, 1828)
• Creseis clava (Rang, 1828) accepted as Creseis acicula (Rang, 1828)
• Creseis virgula (Rang, 1828)
• Cuthona concinna (Alder & Hancock, 1843) accepted as Cuthonella concinna (Alder & Hancock, 1843)
• Cuthona gymnota (Couthouy, 1838) accepted as Catriona gymnota (Couthouy, 1838)
• Cuthona nana (Alder & Hancock, 1842)
• Cuthona pustulata (Alder & Hancock, 1854) accepted as Zelentia pustulata (Alder & Hancock, 1854)
• Cuthona stimpsoni A. E. Verrill, 1879 accepted as Ziminella salmonacea (Couthouy, 1838)
• Cuthona veronicae (A. E. Verrill, 1880)
• Cuthona viridis (Forbes, 1840) accepted as Diaphoreolis viridis (Forbes, 1840)
• Cuthonella concinna (Alder & Hancock, 1843)
• Cuvierina atlantica Bé, MacClintock & Currie, 1972
• Cuvierina columnella (Rang, 1827)
• Cylichna alba (T. Brown, 1827)
• Cylichna cylindracea (Pennant, 1777)
• Cylichna cylindrica (Bruguière, 1792) accepted as Cylichna cylindracea (Pennant, 1777)
• Cylichna eburnea A. E. Verrill, 1885
• Cylichna gouldii (Couthouy, 1839)
• Cylichna linearis Jeffreys, 1867 accepted as Cylichna cylindracea (Pennant, 1777)
• Cylichna magna Lemche, 1941 accepted as Pseudocylichna magna (Lemche, 1941)
• Cylichna occulta (Mighels & C. B. Adams, 1842) accepted as Cylichnoides occultus (Mighels & C. B. Adams, 1842)
• Cylichna vortex (Dall, 1881)
• Cylichnella bidentata (A. d'Orbigny, 1841)
• Cylichnella oryza (Totten, 1835)
• Cylichnina umbilicata (Montagu, 1803) accepted as Retusa umbilicata (Montagu, 1803)
• Cylichnoides occultus (Mighels & C. B. Adams, 1842)
• Dendronotus dalli Bergh, 1879
• Dendronotus elegans A. E. Verrill, 1880
• Dendronotus frondosus (Ascanius, 1774)
• Dendronotus robustus A. E. Verrill, 1870
• Diacavolinia elegans van der Spoel, Bleeker & Kobayasi, 1993 accepted as Diacavolinia strangulata (Deshayes, 1823)
• Diacavolinia longirostris (Blainville, 1821)
• Diacavolinia strangulata (Deshayes, 1823)
• Diacria atlantica Dupont, 1998 accepted as Diacria trispinosa (Blainville, 1821)
• Diacria trispinosa (Blainville, 1821)
• Diaphana minuta T. Brown, 1827
• Diaphoreolis viridis (Forbes, 1840)
• Doridella obscura A. E. Verrill, 1870 accepted as Corambe obscura (A. E. Verrill, 1870)
• Doriopsilla pharpa Er. Marcus, 1961
• Doris verrucosa Linnaeus, 1758
• Doto coronata (Gmelin, 1791)
• Doto formosa A. E. Verrill, 1875
• Elysia catulus (A. Gould, 1870)
• Elysia chlorotica A. Gould, 1870
• Ercolania fuscata (A. Gould, 1870)
• Eubranchus exiguus (Alder & Hancock, 1848)