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)
- Family Amphiperatidae J. E. Gray, 1853 accepted as Ovulidae J. Fleming, 1822
- Family Cypraeidae Rafinesque, 1815 (817)
- Family Eocypraeidae F. A. Schilder, 1924 (74)
- Family Ovulidae J. Fleming, 1822 (394)
- Subfamily Aclyvolvinae Fehse, 2007 (4)
- Subfamily Cypraediinae F. A. Schilder, 1927 (76)
- Subfamily Jenneriinae Thiele, 1929 accepted as Cypraediini F. A. Schilder, 1927 †
- Subfamily Ovulinae J. Fleming, 1828 (56)
- Genus Amphiperas Herrmannsen, 1846 accepted as Ovula Bruguière, 1789
- Genus Birostra Swainson, 1840 accepted as Volva Röding, 1798
- Genus Birostris O. Fabricius, 1823 accepted as Volva Röding, 1798
- Genus Calcarovula C. N. Cate, 1973 (6)
- Genus Kurodaovula Azuma, 1987 (1)
- Genus Ovula Bruguière, 1789 (8)
- Genus Ovulum G. B. Sowerby I, 1828 accepted as Ovula Bruguière, 1789
- Genus Parlicium Schilder, 1939 accepted as Ovula Bruguière, 1789
- Genus Pellasimnia Schilder, 1939 (8)
- Genus Phenacovoluva [sic] accepted as Phenacovolva Iredale, 1930
- Genus Phenacovolva Iredale, 1930 (26)
- Genus Radius Montfort, 1810 accepted as Volva Röding, 1798
- Genus Takasagovolva Azuma, 1974 (2)
- Genus Volva Röding, 1798 (5)
- Subfamily Pediculariinae Gray, 1853 (28)
- Subfamily Prionovolvinae Fehse, 2007 (161)
- Subfamily Simniinae F. A. Schilder, 1927 (65)
- Genus Calpurna accepted as Calpurnus Montfort, 1810
- Genus Hiata C. N. Cate, 1973 accepted as Hiatavolva C. N. Cate, 1973
- Genus Kuroshiovolva M. Azuma & C. N. Cate, 1971 (2)
- Genus Margovula Iredale, 1935 accepted as Margovula C. N. Cate, 1973
- Genus Quasisimnia Lorenz & Fehse, 2009 (2)
- Genus Simia [sic] accepted as Simnia Risso, 1826
- Genus Turbovula C. N. Cate, 1973 accepted as Phenacovolva Iredale, 1930
- Genus Ultimus Montfort, 1810 accepted as Cyphoma Röding, 1798
- Family Pediculariidae Gray, 1853 accepted as Pediculariinae Gray, 1853
- 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)
- 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