Order: CEPHALASPIDEA Fischer, P., 1883
Superfamily: ACTEONOIDEA d'Orbigny, 1835
Family: Acteonidae d'Orbigny, 1835
Family: Bullinidae Lamarck, 1801
Family: Hydatinidae Pilsbry, 1893

Superfamily: RINGICULOIDEA Philippi, 1853
Family: Ringiculidae Philippi, 1853

Superfamily: CYLINDRBULLOIDEA Thiele, 1931
Family: Cylindrobullidae Lamarck, 1801

Superfamily: DIAPHANOIDEA Odhner, 1914
Family: Diaphanidae Odhner, 1914
Family: Toledoninae Warén

Superfamily: PHILINOIDEA Gray, 1850
Family: Cylichnidae Adams, H. & A., 1854
Family: Retusidae Thiele, 1925
Family: Philinidae Gray, 1850
Family: Philinoglossidae Hertling, 1932
Family: Aglajidae Pilsbry, 1895 (1847)
Family: Gastropteridae Swainson, 1840

Superfamily: HAMINOIDEA Pilsbry, 1895
Family: Haminoeidae Pilsbry, 1895
Family: Bullactidae Thiele, 1926
Family: Smaragdinellidae Adams, A. & Reeve, 1848
Family: Plusculidae Marcus, 1953
Family: Ildicidae Burn, 1963

Superfamily: BULLOIDEA Lamarck, 1801
Family: Bullidae Lamarck, 1801

Superfamily: RUNCINOIDEA Adams, H. & A., 1854
Family: Runcinidae Gray, J.E., 1857
Family: Ilbiidae Burn, 1963

Order: ACOCHLIDEA Odhner, 1937
Family: Microhedylidae Odhner, 1937
Family: Asperspinidae Rankin, 1979
Family: Hedylopsidae Odhner, 1952
Family: Minicheviellidae Starobogatov, 1983
Family: Ganatidae Rankin, 1979

Order: RHODOPEMORPHA unknown author
Family: Rhodopidae Kolliker, 1847

Order: SACOGLOSSA von Ihering, 1876

Superfamily: CYLINDROBULLOIDEA  Thiele, 1931 is placed in the Order CEPHALASPIDEA

Superfamily: OXYNOIDEA Adams, H. & A., 1854
Family: Volvatellidae Pilsbry, 1895
Family: Oxynoidae Stoliczka, 168
Family: Juliidae Smith, E.A., 1885
Superfamily: ELYSIOIDEA Adams, H. & A., 1854
Family: Plakobranchidae Rang, 1829
Family: Elysiidae Forbes & Hanley, 1851
Family: Boselliidae Marcus, Ev., 1982
Family: Gascoignellidae unknown author
Family: Platyhedylidae Salvini-Plawen, 1973

Superfamily: LIMAPONTIOIDEA  unknown author
Family: Caliphyllidae Thiele, 1912
Family: Costasiellidae Clark, 1984
Family: Hermaeidae Adams, H. & A., 1854
Family: Limapontiidae Gray, 1847

Order: ANASPIDEA Fischer, P., 1883
Superfamily: AKEROIDEA Mazzarelli, 1891
Family: Akeridae Pilsbry, 1893

Superfamily: APLYSIOIDEA Lamarck, 1809
Family: Aplysiidae Lamarck, 1809

Order: NOTASPIDEA Fischer, P., 1883
Superfamily: TYLODINOIDEA unknown author
Family: Tylodinidae Gray, 1847
Family: Umbraculidae Dall, 1889

Superfamily: PLEUROBRANCHOIDEA  de Férussac, 1822
Family: Pleurobranchidae de Férussac, 1822

Order: THECOSOMATA de Blainville, 1823
Suborder:EUTHECOSOMATA Meisenheimer, 1905
Family: Limacinidae de Blainville, 1823
Family: Cavoliniidae Gray, 1850
Suborder:PSEUDOTHECOSOMATA Meisenheimer, 1905
Family: Peraclidae Tesch, 1913
Family: Cymbuliidae Cantraine, 1841
Family: Desmopteridae Chun, 1889

Order: GYMNOSOMATA de Blainville, 1824
Family: Clionidae Rafinesque, 1815
Family: Thliptodontidae unknown author
Family: Cliopsidae Costa, O.G., 1873
Family: Hydromylidae Pruvot-Fol, 1954
Family: Notobranchaeidae Pelseneer, 1886
Family: Pneumodermatidae Latreille, 1825

Order: NUDIBRANCHIA de Blainville, 1814
Suborder: DORIDINA Odhner, 1934
Superfamily: ANADORIDOIDEA Odhner, 1934
Family: Corambidae Bergh, 1871
Family: Goniodorididae Adams, H. & A., 1854
Family: Onchidorididae Gray, 1827
Family: Akiodorididae Millen & Martynov, 2005
Family: Polyceridae Alder & Hancock, 1845
Family: Gymnodorididae Odhner, 1941
Family: Aegiretidae Fischer, P., 1883
Family: Vayssiereidae Thiele, 1931

Superfamily: EUDORIDOIDEA Odhner, 1934
Family: Hexabranchidae Bergh, 1891
Family: Actinocyclidae Pruvot-Fol, 1934
Family: Dorididae Rafinesque, 1815
Family: Chromodorididae Bergh, 1891
Family: Dendrodorididae O'Donoghue, 1924
Family: Mandeliidae Valdés & Gosliner, 1999
Family: Phyllidiidae Rafinesque, 1814

Superfamily: GNATHODORIDOIDEA Odhner, 1968
Family: Bathydorididae Bergh, 1891
Family: Doridoxidae Bergh, 1900

Suborder: DENDRONOTINAOdhner, 1934
Family: Tritoniidae Lamarck, 1809
Family: Bornellidae Fischer, 1883
Family: Marianidae Odhner, 1968
Family: Dendronotidae Alder & Hancock, 1864
Family: Hancockiidae MacFarland, 1923
Family: Dotidae Gray, 1853
Family: Scyllaeidae Alder & Hancock, 1855
Family: Tethyidae Fischer, 1886
Family: Phylliroidae de Férussac, 1821
Family: Lomanotidae Bergh, 1890

Suborder: ARMININA Odhner, 1934
Family: Arminidae Iredale & O'Donoghue, 1923
Family: Doridomorphidae Odhner, 1968
Family: Charcotiidae Odhner, 1926
Family: Dironidae Eliot, 1910
Family: Madrellidae Preston, 1911
Family: Zephyrinidae Iredale & O'Donogue, 1923
Family: Heroidae Gray, 1857
Family: Pinufiidae Marcus & Marcus, 1960