• Acera bullata (O. F. Müller, 1776) accepted as Akera bullata O. F. Müller, 1776
• Acera bullata var. nana Jeffreys, 1867 accepted as Akera bullata O. F. Müller, 1776
• Acera elegans Locard, 1886 accepted as Akera bullata O. F. Müller, 1776
• Acera spirata Staadt, 1913 † accepted as Akera spirata Staadt, 1913 †
• Aceras africana Locard, 1897 accepted as Cylichnium africanum (Locard, 1897)
• Aceras elegans Locard, 1886 accepted as Akera bullata O. F. Müller, 1776
• Aceras fischeri Locard, 1897 accepted as Cylichnium africanum (Locard, 1897)
• Aclesia africana Engel, 1926 accepted as Bursatella africana (Engel, 1926)
• Aclesia areola Pease, 1860 (uncertain > unassessed)
• Aclesia euchlora H. Adams & A. Adams, 1854 accepted as Aplysia (Phycophila) euchlora A. Adams, 1861 accepted as Phycophila euchlora (A. Adams, 1861)
• Aclesia freeri L. E. Griffin, 1912 accepted as Bursatella leachii Blainville, 1817
• Aclesia glauca Cheeseman, 1878 accepted as Bursatella leachii Blainville, 1817
• Aclesia intrapicta T. D. A. Cockerell, 1893 accepted as Bursatella leachii Blainville, 1817
• Aclesia longicauda Engel, 1927 (uncertain > taxon inquirendum)
• Aclesia nigra Engel, 1927 (uncertain > taxon inquirendum)
• Aclesia ocelligera Bergh, 1902 accepted as Bursatella ocelligera (Bergh, 1902)
• Aclesia orientalis Engel, 1926 (uncertain > taxon inquirendum)
• Aclesia polyomma (Mörch, 1863) accepted as Stylocheilus polyomma (Mörch, 1863)
• Aclesia pusilla Bergh, 1905 (uncertain > taxon inquirendum)
• Aclesia rickettsi MacFarland, 1966 accepted as Stylocheilus rickettsi (MacFarland, 1966)
• Aclesia rosea Engel, 1926 accepted as Bursatella leachii Blainville, 1817
• Aclesia varicolor Bergh, 1905 accepted as Phyllaplysia varicolor (Bergh, 1905)
• Akera aperta Hedley, 1899 accepted as Oxynoe aperta (Hedley, 1899)
• Akera bayeri Ev. Marcus & Er. Marcus, 1967
• Akera bullata O. F. Müller, 1776
• Akera constricta Kuroda, 1947 accepted as Akera soluta (Gmelin, 1791)
• Akera constricta Stephenson, 1941 †
• Akera eliai Shalem, 1928 † accepted as Hamlinia eliai (Shalem, 1928) †
• Akera flexilis T. Brown, 1844 accepted as Akera bullata O. F. Müller, 1776
• Akera julieae Á. Valdés & Barwick, 2005
• Akera silbo Ortea & Moro, 2009
• Akera soluta (Gmelin, 1791)
• Akera spirata Staadt, 1913 †
• Akera striatella (Lamarck, 1804) †
• Akera tasmanica C. E. Beddome, 1883 accepted as Diaphana tasmanica (C. E. Beddome, 1883)
• Akera thompsoni Olsson & T. L. McGinty, 1951 accepted as Akera bayeri Ev. Marcus & Er. Marcus, 1967
• Aplysia (Aplysia) nigra A. d'Orbigny, 1836 represented as Aplysia nigra A. d'Orbigny, 1836
• Aplysia (Metaplysia) badistes Pilsbry, 1951 accepted as Aplysia juliana Quoy & Gaimard, 1832
• Aplysia (Neaplysia) nettiae Winkler, 1959 accepted as Aplysia californica J. G. Cooper, 1863
• Aplysia (Phycophila) euchlora A. Adams, 1861 accepted as Phycophila euchlora (A. Adams, 1861)
• Aplysia (Phycophila) ocellata A. Adams, 1861 accepted as Tethys (Phycophila) adamsi Pilsbry, 1896
• Aplysia (Pruvotaplysia) concava G. B. Sowerby I, 1833 represented as Aplysia concava G. B. Sowerby I, 1833
• Aplysia (Pruvotaplysia) parvula Mörch, 1863 represented as Aplysia parvula Mörch, 1863
• Aplysia (Tethys) benedicti Eliot, 1900 accepted as Aplysia argus Rüppell & Leuckart, 1830
• Aplysia (Varria) dactylomela Rang, 1828 represented as Aplysia dactylomela Rang, 1828
• Aplysia (Varria) extraordinaria (J. K. Allan, 1932) represented as Aplysia extraordinaria (J. K. Allan, 1932)
• Aplysia (Varria) inca A. d'Orbigny, 1836 represented as Aplysia inca A. d'Orbigny, 1836
• Aplysia aequorea Heilprin, 1888 accepted as Aplysia dactylomela Rang, 1828
• Aplysia albopunctata Deshayes, 1853 accepted as Aplysia punctata (Cuvier, 1803)
• Aplysia allochroa Bergh, 1908 (uncertain > nomen dubium)
• Aplysia angasi G. B. Sowerby II, 1869 accepted as Aplysia argus Rüppell & Leuckart, 1830
• Aplysia anguilla G. B. Sowerby I, 1869 (uncertain > taxon inquirendum)
• Aplysia annulifera Thiele, 1930 accepted as Aplysia argus Rüppell & Leuckart, 1830
• Aplysia argus Rüppell & Leuckart, 1830
• Aplysia ascifera Rang, 1828 accepted as Dolabrifera ascifera (Rang, 1828)
• Aplysia asciola S. V. Wood, 1851 † (uncertain > unassessed)
• Aplysia atromarginata Bergh, 1905
• Aplysia australiana Clessin, 1899 accepted as Aplysia parvula Mörch, 1863
• Aplysia benedicti Eliot, 1900 accepted as Aplysia argus Rüppell & Leuckart, 1830
• Aplysia bourailli Risbec, 1951 accepted as Aplysia argus Rüppell & Leuckart, 1830
• Aplysia brasiliana Rang, 1828
• Aplysia brasiliensis G. B. Sowerby I, 1833 (uncertain > taxon inquirendum)
• Aplysia brongniartii Blainville, 1825 (uncertain > nomen dubium)
• Aplysia brugnatelli van Beneden & Robb, 1835 accepted as Petalifera petalifera (Rang, 1828)
• Aplysia brunnea F. W. Hutton, 1875 accepted as Aplysia juliana Quoy & Gaimard, 1832
• Aplysia bursatella Rang, 1834 accepted as Bursatella leachii Blainville, 1817
• Aplysia californica J. G. Cooper, 1863
• Aplysia cedrosensis Bartsch & Rehder, 1939
• Aplysia cervina (Dall & C. T. Simpson, 1901)
• Aplysia chierchiana Mazzarelli & Zuccardi, 1889 accepted as Aplysia inca A. d'Orbigny, 1836
• Aplysia cirrhifera Quoy & Gaimard, 1832 accepted as Bursatella leachii Blainville, 1817
• Aplysia citrina Rang, 1828 accepted as Stylocheilus longicauda (Quoy & Gaimard, 1825)
• Aplysia concava G. B. Sowerby I, 1833
• Aplysia cornigera G. B. Sowerby II, 1869
• Aplysia cronullae Eales, 1960 accepted as Aplysia extraordinaria (J. K. Allan, 1932)
• Aplysia cuvieri Delle Chiaje, 1828 accepted as Aplysia punctata (Cuvier, 1803)
• Aplysia dactylomela Rang, 1828
• Aplysia denisoni E. A. Smith, 1884 accepted as Aplysia extraordinaria (J. K. Allan, 1932)
• Aplysia depilans Gmelin, 1791
• Aplysia depressa Cantraine, 1835 accepted as Petalifera petalifera (Rang, 1828)
• Aplysia dolabella Cuvier, 1805 (uncertain > nomen dubium)
• Aplysia dolabrifera Rang, 1828 accepted as Dolabrifera dolabrifera (Rang, 1828)
• Aplysia donca Ev. Marcus & Er. Marcus, 1960 accepted as Aplysia morio (A. E. Verrill, 1901)
• Aplysia dumortieri Cantraine, 1835 accepted as Aplysia punctata (Cuvier, 1803)
• Aplysia dura Eales, 1960
• Aplysia ecaudata Rang, 1828 accepted as Dolabella auricularia ([Lightfoot], 1786)
• Aplysia elongata (Pease, 1860)
• Aplysia euchlora A. Adams, 1861 accepted as Phycophila euchlora (A. Adams, 1861)
• Aplysia eusiphonata Bergh, 1907 accepted as Aplysia maculata Rang, 1828
• Aplysia excavata G. B. Sowerby I, 1869 accepted as Aplysia sydneyensis G. B. Sowerby I, 1869
• Aplysia extraordinaria (J. K. Allan, 1932)
• Aplysia fasciata Poiret, 1789
• Aplysia ferussaci Rang, 1828 accepted as Aplysia punctata (Cuvier, 1803)
• Aplysia fimbriata A. Adams & Reeve, 1850 accepted as Aplysia argus Rüppell & Leuckart, 1830
• Aplysia fimbriata A. Gould, 1850 (uncertain > taxon inquirendum)
• Aplysia gargantua Bergh, 1907 accepted as Aplysia maculata Rang, 1828
• Aplysia gelatinosa Rang, 1828 accepted as Notarchus indicus Schweigger, 1820
• Aplysia geographica (A. Adams & Reeve, 1850) accepted as Syphonota geographica (A. Adams & Reeve, 1850)
• Aplysia ghanimii Golestani, Crocetta, Padula, Camacho-García, Langeneck, Poursanidis, Pola, Yokeş, Cervera, D.-W. Jung, Gosliner, Araya, Hooker, Schrödl & Á. Valdés, 2019
• Aplysia gigantea G. B. Sowerby I, 1869