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)
- Subfamily Adustinae Cotton & Steadman, 1946 accepted as Erroneinae F. A. Schilder, 1927
- Subfamily Archicypraeinae F. A. Schilder, 1927 † accepted as Gisortiinae F. A. Schilder, 1927 †
- Subfamily Bernayinae Schilder, 1927 † accepted as Gisortiinae F. A. Schilder, 1927 †
- Subfamily Cypraeinae Rafinesque, 1815 (146)
- Subfamily Cypraeovulinae F. A. Schilder, 1927 (48)
- Subfamily Erosariinae Schilder, 1924 (118)
- Subfamily Erroneinae F. A. Schilder, 1927 (149)
- Tribe Bistolidini C. P. Meyer, 2003 (71)
- Tribe Erroneini F. A. Schilder, 1927 (63)
- Genus Adusta Jousseaume, 1884 accepted as Erronea Troschel, 1863
- Genus Blasicrura Iredale, 1930 (2)
- Genus Contradusta C. Meyer, 2003 (2)
- Genus Eclogavena Iredale, 1930 (7)
- Genus Erronea Troschel, 1863 (22)
- Genus Ficadusta T. Habe & Kosuge, 1966 (2)
- Genus Gratiadusta Iredale, 1930 accepted as Erronea Troschel, 1863
- Genus Ipserronea Iredale, 1935 accepted as Erronea Troschel, 1863
- Genus Melicerona Iredale, 1930 (2)
- Species Melicerona felina (Gmelin, 1791)
- Species Melicerona listeri (J. E. Gray, 1824)
- Species Melicerona melvilli (Hidalgo, 1906) accepted as Melicerona listeri melvilli (Hidalgo, 1906)
- Genus Opponaria Iredale, 1939 accepted as Purpuradusta F. A. Schilder, 1939
- Genus Palangerosa Iredale, 1930 accepted as Erronea Troschel, 1863
- Genus Palmulacypraea C. Meyer, 2003 (2)
- Genus Paradusta Lorenz, 2017 (2)
- Genus Purpuradusta F. A. Schilder, 1939 (8)
- Genus Ransonia Dolin & Lozouet, 2004 accepted as Ransoniella Dolin & Lozouet, 2005
- Genus Ransoniella Dolin & Lozouet, 2005 (14)
- Genus Solvadusta Iredale, 1935 accepted as Erronea Troschel, 1863
- Tribe Hiraseadustini Dolin, 2024 (15)
- Subfamily Gisortiinae F. A. Schilder, 1927 † (60)
- Subfamily Luriinae Schilder, 1932 (90)
- Subfamily Mandolininae Schilder, 1932 † accepted as Gisortiinae F. A. Schilder, 1927 †
- Subfamily Mauritiinae Steadman & Cotton, 1946 accepted as Mauritiini Steadman & Cotton, 1946
- Subfamily Pustulariinae Gill, 1871 (9)
- Subfamily Umbiliinae Schilder, 1932 (23)
- Subfamily Zoilinae Iredale, 1935 (35)
- Subfamily Zonariinae F. A. Schilder, 1932 (139)
- Genus Protopirula Rennie, 1930 † accepted as Cypraea Linnaeus, 1758
- Genus Sinusigera A. d'Orbigny, 1853
- Family Eocypraeidae F. A. Schilder, 1924 (74)
- Family Ovulidae J. Fleming, 1822 (394)
- 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