Between brackets is the number of accepted species

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- Mollusca (132 791)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (25 009)
- Class Caudofoveata (143)
- Class Cephalopoda (1 834)
- Class Conchifera accepted as Bivalvia
- Class Cricoconarida † (1)
- Class Gastropoda (102 697)
- Subclass Amphigastropoda † (390)
- Subclass Angiogastropoda represented as Gastropoda
- Subclass Apogastropoda
- Subclass Caenogastropoda (53 636)
- Subclass Gastropoda incertae sedis (308)
- Subclass Heterobranchia (39 156)
- Infraclass "Lower Heterobranchia" (1 137)
- Infraclass Euthyneura (37 433)
- Subterclass Acteonimorpha (411)
- Subterclass Ringipleura (2 917)
- Superorder Nudipleura (2 748)
- Order Notaspidea accepted as Pleurobranchomorpha
- Order Nudibranchia (2 651)
- Suborder Aeolidina accepted as Cladobranchia
- Suborder Anthobranchia accepted as Doridina
- Suborder Cladobranchia (1 092)
- Suborder Cladohepatica accepted as Cladobranchia
- Suborder Dexiarchia accepted as Cladobranchia
- Suborder Doridina (1 558)
- Infraorder Bathydoridoidei (8)
- Infraorder Doridoidei (1 550)
- Superfamily Chromodoridoidea Bergh, 1891 (482)
- Superfamily Doridoidea Rafinesque, 1815 (434)
- Superfamily Doridoidei incertae sedis
- Superfamily Onchidoridacea accepted as Onchidoridoidea Gray, 1827
- Superfamily Onchidoridoidea Gray, 1827 (278)
- Family Aegiretidae P. Fischer, 1883 accepted as Aegiridae P. Fischer, 1883
- Family Aegiridae P. Fischer, 1883 (31)
- Family Akiodorididae Millen & Martynov, 2005 (9)
- Family Ancylodorididae Thiele, 1926 accepted as Onchidorididae Gray, 1827
- Family Calycidorididae Roginskaya, 1972 (6)
- Family Corambidae Bergh, 1871 (12)
- Genus Corambe Bergh, 1869 (9)
- Genus Corambella Balch, 1899 accepted as Corambe Bergh, 1869
- Genus Doridella A. E. Verrill, 1870 accepted as Corambe Bergh, 1869
- Genus Gulbinia Martynov, 1994 accepted as Corambe Bergh, 1869
- Genus Hypobranchiaea A. Adams, 1847
- Genus Loy Martynov, 1994 (3)
- Genus Neocorambe Swennen & R. Dekker, 1995 accepted as Corambe Bergh, 1869
- Genus Paracorambe Swennen & R. Dekker, 1995 accepted as Corambe Bergh, 1869
- Genus Proloy Martynov, 1994 accepted as Loy Martynov, 1994
- Genus Psammodoris Martynov, 1994 accepted as Loy Martynov, 1994
- Species Psammodoris thompsoni (Millen & Nybakken, 1991) accepted as Loy thompsoni (Millen & Nybakken, 1991)
- Genus Quasicorambe Martynov, 1994 accepted as Corambe Bergh, 1869
- Genus Suhinia Martynov, 1994 accepted as Corambe Bergh, 1869
- Family Goniodorididae H. Adams & A. Adams, 1854 (172)
- Family Lamellidorididae Pruvot-Fol, 1933 accepted as Onchidorididae Gray, 1827
- Family Notodorididae Eliot, 1910 accepted as Aegiridae P. Fischer, 1883
- Family Okeniidae Iredale & O'Donoghue, 1923 accepted as Goniodorididae H. Adams & A. Adams, 1854
- Family Onchidorididae Gray, 1827 (48)
- Superfamily Phyllidioidea Rafinesque, 1814 (156)
- Superfamily Polyceroidea Alder & Hancock, 1845 (200)
- Superfamily Porodoridacea Odhner, 1968 accepted as Phyllidioidea Rafinesque, 1814
- Superfamily Porostomata Bergh, 1876 accepted as Phyllidioidea Rafinesque, 1814
- Infraorder Gnathodoridacea accepted as Bathydoridoidei
- Suborder Euctenidiacea accepted as Doridina
- Suborder Holohepatica accepted as Doridina
- Suborder Nudibranchia incertae sedis (1)
- Order Pleurobranchida (97)
- Genus Abranchus [sic] accepted as Abrancha van Hasselt, 1824
- Genus Spongiodoris Pruvot-Fol, 1933
- Superorder Ringiculimorpha (169)
- Order Pleurobranchomorpha accepted as Pleurobranchida
- Genus Abrancha van Hasselt, 1824
- Subterclass Tectipleura (34 105)
- Superorder Euthyneura incertae sedis
- Infraclass Heterobranchia incertae sedis (478)
- Infraclass Mesoneura (108)
- Infraclass Opisthobranchia
- Infraclass Pulmonata
- Subclass Neomphaliones accepted as Vetigastropoda
- Subclass Neritimorpha (1 914)
- Subclass Orthogastropoda represented as Gastropoda
- Subclass Patellogastropoda (511)
- Subclass Prosobranchia
- Subclass Psilogastropoda represented as Gastropoda
- Subclass Vetigastropoda (6 782)
- Class Lamellibranchiata accepted as Bivalvia
- Class Loricata accepted as Polyplacophora
- Class Mollusca incertae sedis † (372)
- Class Monoplacophora (229)
- Class Pelecypoda accepted as Bivalvia
- Class Polyplacophora (1 377)
- Class Polyplaxiphora accepted as Polyplacophora
- Class Rostroconchia † (64)
- Class Scaphopoda (752)
- Class Solenoconchia accepted as Scaphopoda
- Class Solenogastres (313)
- Subclass Chaetodermomorpha accepted as Caudofoveata