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)
- Subterclass Sorbeoconcha (147)
- Superorder Hypsogastropoda
- Order Architaenioglossa (4 918)
- Order Caenogastropoda incertae sedis (7 676)
- Order Littorinimorpha (17 179)
- Superfamily Calyptraeoidea Lamarck, 1809 (203)
- Superfamily Capuloidea J. Fleming, 1822 (218)
- Superfamily Cassoidea accepted as Tonnoidea Suter, 1913 (1825)
- Superfamily Cingulopsoidea Fretter & Patil, 1958 (193)
- Superfamily Crepiduloidea J. Fleming, 1822 accepted as Calyptraeoidea Lamarck, 1809
- Superfamily Cypraeoidea Rafinesque, 1815 (1 285)
- Superfamily Eulimoidea R. A. Philippi, 1853 accepted as Vanikoroidea Gray, 1840
- Superfamily Ficoidea Meek, 1864 (1840) (71)
- Superfamily Heteropoda Lamarck, 1812 accepted as Pterotracheoidea Rafinesque, 1814
- Superfamily Hipponicoidea Troschel, 1861 (99)
- Superfamily Littorinoidea Children, 1834 (1 372)
- Superfamily Naticoidea Guilding, 1834 (688)
- Superfamily Pterotracheoidea Rafinesque, 1814 (63)
- Superfamily Rissoacea accepted as Rissooidea Gray, 1847
- Superfamily Rissoinoidea W. Stimpson, 1865 accepted as Rissooidea Gray, 1847
- Superfamily Rissooidea Gray, 1847 (2 311)
- Superfamily Stromboidea Rafinesque, 1815 (835)
- Family Aporrhaidae J. E. Gray, 1850 (246)
- Family Aporrhaididae accepted as Aporrhaidae J. E. Gray, 1850
- Family Aporrhaiidae accepted as Aporrhaidae J. E. Gray, 1850
- Family Chenopidae Deshayes, 1865 accepted as Aporrhaidae J. E. Gray, 1850
- Family Colombellinidae P. Fischer, 1884 † (5)
- Family Columbellariidae Zittel, 1895 † accepted as Colombellinidae P. Fischer, 1884 †
- Family Dicrolomatidae Korotkov, 1992 † accepted as Aporrhaidae J. E. Gray, 1850
- Family Dilatilabridae Bandel, 2007 † (2)
- Family Hippochrenidae Bandel, 2007 † (25)
- Family Lamelliphoridae Korobkov, 1960 † (1)
- Family Neostromboidae S. J. Maxwell, Dekkers, Rymer & Congdon, 2019 accepted as Strombidae Rafinesque, 1815
- Family Onustidae H. Adams & A. Adams, 1854 accepted as Xenophoridae Troschel, 1852 (1840)
- Family Pereiraeidae Bandel, 2007 †
- Family Phoridae Gray, 1840 accepted as Xenophoridae Troschel, 1852 (1840)
- Family Pterocerellidae Bandel, 2007 † accepted as Pterocerellinae Bandel, 2007 †
- Family Pteroceridae Haller, 1892 accepted as Strombidae Rafinesque, 1815
- Family Pugnellidae Kiel & Bandel, 1999 † accepted as Pugnellinae Kiel & Bandel, 1999 † (4)
- Family Rimellidae R. B. Stewart, 1927 accepted as Rostellariidae Gabb, 1868
- Family Rostellariidae Gabb, 1868 (107)
- Family Seraphsidae Gray, 1853 (27)
- Family Spinigeridae Korotkov, 1992 † accepted as Spinilomatinae Gründel, Nützel & Schulbert, 2009
- Family Strombidae Rafinesque, 1815 (262)
- Family Struthiolariidae Gabb, 1868 (67)
- Family Terebellidae H. Adams & A. Adams, 1854 accepted as Seraphsidae Gray, 1853
- Family Thersiteidae Savornin, 1914 † (17)
- Genus Hemithersitea Savornin, 1914 † (5)
- Genus Oostrombus Sacco, 1893 † (2)
- Genus Orthaulax Gabb, 1873 † (8)
- Genus Pseudothersitea Savornin, 1914 † (1)
- Genus Thersitea Coquand, 1862 † (1)
- Family Tibiidae A. N. Golikov & Starobogatov, 1975 accepted as Rostellariidae Gabb, 1868
- Family Xenophoridae Troschel, 1852 (1840) (72)
- Family Zitteliidae Schilder, 1936 † accepted as Colombellinidae P. Fischer, 1884 †
- Superfamily Tonnoidea Suter, 1913 (1825) (788)
- Superfamily Truncatelloidea J. E. Gray, 1840 (6 902)
- Superfamily Vanikoroidea Gray, 1840 (1 331)
- Superfamily Velutinoidea Gray, 1840 (648)
- Superfamily Vermetoidea Rafinesque, 1815 (172)
- Superfamily Xenophoroidea Troschel, 1852 (1840) accepted as Stromboidea Rafinesque, 1815
- Order Neogastropoda (23 716)
- Order Stenoglossa accepted as Neogastropoda
- Subclass Gastropoda incertae sedis (308)
- Subclass Heterobranchia (39 156)
- 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