Between brackets is the number of accepted species
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- Mollusca (132 708)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (24 984)
- Class Caudofoveata (143)
- Class Cephalopoda (1 827)
- Class Conchifera accepted as Bivalvia
- Class Cricoconarida † (1)
- Class Gastropoda (102 646)
- Subclass Amphigastropoda † (387)
- Subclass Angiogastropoda represented as Gastropoda
- Subclass Apogastropoda
- Subclass Caenogastropoda (53 590)
- Subclass Gastropoda incertae sedis (308)
- Subclass Heterobranchia (39 154)
- Infraclass "Lower Heterobranchia" (1 137)
- Infraclass Euthyneura (37 431)
- Subterclass Acteonimorpha (411)
- Subterclass Ringipleura (2 918)
- Superorder Nudipleura (2 749)
- Order Notaspidea accepted as Pleurobranchomorpha
- Order Nudibranchia (2 652)
- Suborder Aeolidina accepted as Cladobranchia
- Suborder Anthobranchia accepted as Doridina
- Suborder Cladobranchia (1 093)
- Infraorder Pseudoeuctenidiacea accepted as Doridoxoidea Bergh, 1899
- Parvorder Aeolidida accepted as Aeolidioidea Gray, 1827
- Parvorder Dendronotida accepted as Dendronotoidea Allman, 1845
- Parvorder Dendronotina accepted as Dendronotoidea Allman, 1845
- Parvorder Euarminida accepted as Arminoidea Iredale & O'Donoghue, 1923 (1841)
- Section Acleioprocta accepted as Fionoidea Gray, 1857
- Section Cleioprocta accepted as Aeolidioidea Gray, 1827
- Section Pleuroprocta accepted as Flabellinoidea Bergh, 1889
- Superfamily Aeolidiacea accepted as Aeolidioidea Gray, 1827
- Superfamily Aeolidioidea Gray, 1827 (338)
- Superfamily Arminoidea Iredale & O'Donoghue, 1923 (1841) (102)
- Superfamily Cladobranchia incertae sedis (8)
- Superfamily Dendronotoidea Allman, 1845 (199)
- Superfamily Doridoxoidea Bergh, 1899 (2)
- Superfamily Fionoidea Gray, 1857 (304)
- Family Abronicidae Korshunova, Martynov, Bakken, Evertsen, Fletcher, Mudianta, Saito, Lundin, Schrödl & Picton, 2017 (4)
- Family Apataidae Korshunova, Martynov, Bakken, Evertsen, Fletcher, Mudianta, Saito, Lundin, Schrödl & Picton, 2017 (2)
- Family Calmidae Iredale & O'Donoghue, 1923 (2)
- Family Coryphellidae Bergh, 1889 (24)
- Family Cumanotidae Odhner, 1907 (3)
- Family Cuthonellidae M. C. Miller, 1977 (19)
- Family Cuthonidae Odhner, 1934 (44)
- Family Dotoidae accepted as Dotidae Gray, 1853
- Family Eubranchidae Odhner, 1934 (58)
- Family Fionidae Gray, 1857 (5)
- Family Magallanidae Ortea & Moro, 2020 (1)
- Family Murmaniidae Korshunova, Martynov, Bakken, Evertsen, Fletcher, Mudianta, Saito, Lundin, Schrödl & Picton, 2017 (5)
- Family Nossidae Odhner, 1968 accepted as Flabellinidae Bergh, 1889
- Family Paracoryphellidae M. C. Miller, 1971 (11)
- Family Pinufiidae Er. Marcus & Ev. Marcus, 1960 (1)
- Family Pseudovermidae Thiele, 1931 (12)
- Family Samlidae Korshunova, Martynov, Bakken, Evertsen, Fletcher, Mudianta, Saito, Lundin, Schrödl & Picton, 2017 (8)
- Genus Luisella Korshunova, Martynov, Bakken, Evertsen, Fletcher, Mudianta, Saito, Lundin, Schrödl & Picton, 2017 (1)
- Genus Samla Bergh, 1900 (7)
- Species Samla annuligera Bergh, 1900 accepted as Samla bicolor (Kelaart, 1858)
- Species Samla bicolor (Kelaart, 1858)
- Species Samla bilas (Gosliner & Willan, 1991)
- Species Samla macassarana (Bergh, 1905)
- Species Samla riwo (Gosliner & Willan, 1991)
- Species Samla rubropurpurata (Gosliner & Willan, 1991)
- Species Samla takashigei Korshunova, Martynov, Bakken, Evertsen, Fletcher, Mudianta, Saito, Lundin, Schrödl & Picton, 2017
- Species Samla telja (Ev. Marcus & Er. Marcus, 1967)
- Family Tergipedidae Bergh, 1889 (3)
- Family Trinchesiidae F. Nordsieck, 1972 (95)
- Family Unidentidae Millen & Hermosillo, 2012 accepted as Unidentiidae Millen & Hermosillo, 2012
- Family Unidentiidae Millen & Hermosillo, 2012 (6)
- Family Xenocratenidae Martynov, Lundin, Picton, Fletcher, Malmberg & Korshunova, 2020 (1)
- Superfamily Flabellinoidea Bergh, 1889 accepted as Fionoidea Gray, 1857
- Superfamily Proctonotoidea Gray, 1853 (49)
- Superfamily Tritonioidea Lamarck, 1809 (91)
- Suborder Cladohepatica accepted as Cladobranchia
- Suborder Dexiarchia accepted as Cladobranchia
- Suborder Doridina (1 558)
- 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 (34 102)
- 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
