Between brackets is the number of accepted species

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- Mollusca (133 273)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (25 082)
- Class Caudofoveata (143)
- Class Cephalopoda (1 917)
- Class Conchifera accepted as Bivalvia
- Class Cricoconarida † (1)
- Class Gastropoda (103 018)
- Subclass Amphigastropoda † (434)
- Subclass Angiogastropoda represented as Gastropoda
- Subclass Apogastropoda
- Subclass Caenogastropoda (53 827)
- Subterclass Sorbeoconcha (147)
- Superorder Hypsogastropoda
- Order Architaenioglossa (4 921)
- Order Caenogastropoda incertae sedis (7 701)
- Order Littorinimorpha (17 230)
- Superfamily Calyptraeoidea Lamarck, 1809 (203)
- Superfamily Capuloidea J. Fleming, 1822 (220)
- 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 (1 299)
- 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 (689)
- Family Naticidae Guilding, 1834 (689)
- Subfamily Globisininae A. W. B. Powell, 1933 (24)
- Subfamily Naticidae incertae sedis (8)
- Subfamily Naticinae Guilding, 1834 (262)
- Subfamily Polinicinae J. E. Gray, 1847 (263)
- Subfamily Sininae Woodring, 1928 (82)
- Genus Calinaticina J. Q. Burch & G. B. Campbell, 1963 (1)
- Genus Catinus Oken, 1835 accepted as Sinum Röding, 1798
- Genus Cryptostoma accepted as Cryptostomus Blainville, 1818
- Genus Cryptostomus Blainville, 1818 accepted as Sinum Röding, 1798
- Genus Ectosinum Iredale, 1931 accepted as Sinum Röding, 1798
- Genus Eunaticina P. Fischer, 1885 (17)
- Genus Gennaeosinum Iredale, 1929 (3)
- Genus Heliconatica Dall, 1924 accepted as Eunaticina P. Fischer, 1885
- Genus Naticina J. E. Gray, 1847 accepted as Eunaticina P. Fischer, 1885
- Genus Pervisinum Iredale, 1931 accepted as Eunaticina P. Fischer, 1885
- Genus Propesinum Iredale, 1924 accepted as Eunaticina P. Fischer, 1885
- Genus Sigaretotrema Sacco, 1890 † (4)
- Genus Sigaretus Lamarck, 1799 accepted as Sinum Röding, 1798
- Genus Sigatica O. Meyer & Aldrich, 1886 (13)
- Subgenus Sigatica (Sigaretopsis) Cossmann, 1888 † represented as Sigatica O. Meyer & Aldrich, 1886
- Species Sigatica abducta (Deshayes, 1864) †
- Species Sigatica bathyraphe (Pilsbry, 1911)
- Species Sigatica boettgeri (O. Meyer & Aldrich, 1886) †
- Species Sigatica carolinensis (Dall, 1889)
- Species Sigatica cubana Espinosa, Ortea & Fernández-Garcés, 2007
- Species Sigatica hantoniensis (Pilkington, 1804) †
- Species Sigatica infundibulum (Watelet, 1853) †
- Species Sigatica mienisi (Kilburn, 1988)
- Species Sigatica obovata (J. De C. Sowerby, 1850) †
- Species Sigatica peleum (Iredale, 1929) accepted as Gennaeosinum peleum Iredale, 1929
- Species Sigatica pomatiella (Melvill, 1893)
- Species Sigatica repanda (Deshayes, 1864) †
- Species Sigatica semisulcata (J. E. Gray, 1839)
- Species Sigatica woodi (Deshayes, 1864) †
- Genus Sinum Röding, 1798 (44)
- Genus Amauropsina Chelot, 1885 † (3)
- Genus Amauropsona H. J. Finlay & Marwick, 1937 † (2)
- Genus Austrocochlis H. J. Finlay & Marwick, 1937 † (2)
- Genus Bensonia J. E. Gray, 1847 accepted as Laguncula W. H. Benson, 1842
- Genus Benthobulbus J. H. McLean, 1995 (2)
- Genus Carinacca Marwick, 1924 † (4)
- Genus Cepatia J. E. Gray, 1842 † (2)
- Genus Darwinices Griffin & Pastorino, 2013 † (3)
- Genus Laguncula W. H. Benson, 1842 (1)
- Genus Magnatica Marwick, 1924 † (13)
- Genus Maxwellinatica Beu & B. A. Marshall, 2011 † (1)
- Genus Nanggulania K. Martin, 1914 † (1)
- Genus Natiria de Koninck, 1881 † (1)
- Genus Pliconacca K. Martin, 1914 † (6)
- Genus Polinella Marwick, 1931 † (9)
- Genus Prisconatica Gabb, 1877 †
- Genus Scarlatia Schileyko, 1977 accepted as Laguncula W. H. Benson, 1842
- Genus Uba [sic] † accepted as Uber R. A. Philippi, 1853
- Family Polynicidae [sic!] accepted as Polinicinae J. E. Gray, 1847
- 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 (839)
- Superfamily Tonnoidea Suter, 1913 (1825) (787)
- Superfamily Truncatelloidea J. E. Gray, 1840 (6 933)
- 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 (23 828)
- Order Stenoglossa accepted as Neogastropoda
- Subclass Gastropoda incertae sedis (313)
- Subclass Heterobranchia (39 225)
- Subclass Neomphaliones accepted as Vetigastropoda
- Subclass Neritimorpha (1 916)
- Subclass Orthogastropoda represented as Gastropoda
- Subclass Patellogastropoda (514)
- Subclass Prosobranchia
- Subclass Psilogastropoda represented as Gastropoda
- Subclass Vetigastropoda (6 789)
- 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 (1 381)
- Class Polyplaxiphora accepted as Polyplacophora
- Class Rostroconchia † (64)
- Class Scaphopoda (753)
- Class Solenoconchia accepted as Scaphopoda
- Class Solenogastres (313)
- Subclass Chaetodermomorpha accepted as Caudofoveata