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)
- Subterclass Sorbeoconcha (147)
- Superorder Hypsogastropoda
- Order Architaenioglossa (4 916)
- Order Caenogastropoda incertae sedis (7 676)
- Order Littorinimorpha (17 166)
- 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 (1 275)
- 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)
- Family Annulariidae J. B. Henderson & Bartsch, 1920 (716)
- Family Bembiciidae H. J. Finlay, 1928 accepted as Lacuninae Gray, 1857
- Family Bohaispiridae B.-Y. Huang, 1983 † (35)
- Family Cyclostomatidae Menke, 1828 accepted as Pomatiidae R. B. Newton, 1891 (1828)
- Family Ericiidae Wenz, 1915 accepted as Pomatiidae R. B. Newton, 1891 (1828)
- Family Lacunidae Gray, 1857 accepted as Littorinidae Children, 1834
- Family Leviathaniidae Harzhauser & S. Schneider, 2014 † (7)
- Family Littorinidae Children, 1834 (305)
- Subfamily Cremnoconchinae Preston, 1915 accepted as Lacuninae Gray, 1857
- Subfamily Echinininae Rosewater, 1972 accepted as Littorininae Children, 1834
- Subfamily Lacuninae Gray, 1857 (63)
- Subfamily Laevilitorininae D. Reid, 1989 (27)
- Subfamily Littorininae Children, 1834 (211)
- Genus Afrolittorina S. T. Williams, D. Reid & Littlewood, 2003 (4)
- Genus Algamorda Dall, 1918 accepted as Littorina A. Férussac, 1822
- Genus Algaroda Dall, 1918 accepted as Littorina A. Férussac, 1822
- Genus Amerolittorina D. Reid, 2009 accepted as Echinolittorina (Amerolittorina) D. Reid, 2009
- Genus Austrolittorina Rosewater, 1970 (5)
- Genus Bacalia Gray, 1840 accepted as Littorina A. Férussac, 1822
- Genus Brevilittorina A. N. Golikov, Dolgolenko, Maximovich & Scarlato, 1990 accepted as Littorina A. Férussac, 1822
- Genus Cenchritis E. von Martens, 1900 (1)
- Genus Cidaris Röding, 1798 accepted as Tectarius (Tectarius) Valenciennes, 1832
- Genus Cricostoma Mörch, 1857 accepted as Littorina A. Férussac, 1822
- Genus Echinella Swainson, 1840 accepted as Tectarius (Tectarius) Valenciennes, 1832
- Genus Echinellopsis Rovereto, 1899 accepted as Tectarius (Tectarius) Valenciennes, 1832
- Genus Echininus Clench & Abbott, 1942 accepted as Tectarius (Echininus) Clench & Abbott, 1942
- Genus Echinolittorina T. Habe, 1956 (64)
- Genus Ezolittorina Habe, 1958 accepted as Littorina A. Férussac, 1822
- Genus Fossarilittorina Rosewater, 1981 accepted as Echinolittorina (Fossarilittorina) Rosewater, 1981
- Genus Granulilittorina Habe & Kosuge, 1966 accepted as Echinolittorina (Granulilittorina) Habe & Kosuge, 1966
- Genus Litorina [sic] accepted as Littorina A. Férussac, 1822
- Genus Littoraria J. E. Gray, 1833 (46)
- Genus Littorelaea Leach, 1847 accepted as Littorina A. Férussac, 1822
- Genus Littorina A. Férussac, 1822 (34)
- Genus Littorina-capsula accepted as Peasiella G. Nevill, 1885
- Genus Littorinopsis Mörch, 1876 accepted as Littoraria (Littorinopsis) Mörch, 1876 (1)
- Genus Littorivaga Dall, 1918 accepted as Littorina A. Férussac, 1822
- Genus Mainwaringia G. Nevill, 1885 (3)
- Genus Melaraphe Menke, 1828 accepted as Melarhaphe Menke, 1828 (1)
- Genus Melarhaphe Menke, 1828 (16)
- Genus Neritrema Récluz, 1869 accepted as Littorina A. Férussac, 1822
- Genus Nina Gray, 1850 accepted as Tectarius (Echininus) Clench & Abbott, 1942
- Genus Nodilittorina E. von Martens, 1897 (3)
- Genus Pagodus Gray, 1839 accepted as Tectarius (Tectarius) Valenciennes, 1832
- Genus Peasiella G. Nevill, 1885 (16)
- Genus Prosthenodon Cossmann, 1888 † (2)
- Genus Risella Gray, 1842 accepted as Bembicium R. A. Philippi, 1846
- Genus Rufolacuna Ponder, 1976 accepted as Laevilitorina (Rufolacuna) Ponder, 1976
- Genus Tectaria accepted as Tectarius Valenciennes, 1832
- Genus Tectarium P. Fischer, 1885 accepted as Tectarius Valenciennes, 1832
- Genus Tectarius Valenciennes, 1832 (15)
- Genus Tectininus Clench & Abbott, 1942 accepted as Tectarius Valenciennes, 1832
- Genus Turbinarius Duméril, 1805 accepted as Littorina A. Férussac, 1822
- Subfamily Tectariinae Rosewater, 1972 accepted as Littorininae Children, 1834
- Genus Mirolacuna Wenz, 1939 † (2)
- Genus Poroa Marwick, 1953 † (1)
- Genus Procancellaria Wilckens, 1922 † (1)
- Genus Streblorhamphus Tate & Cossmann, 1897 † accepted as Mirolacuna Wenz, 1939 †
- Genus Tamanella [sic] accepted as Temanella Rovereto, 1899
- Family Melarhaphidae Starobogatov & Sitnikova, 1983 accepted as Littorininae Children, 1834
- Family Pomatiidae R. B. Newton, 1891 (1828) (281)
- Family Purpuroideidae Guzhov, 2004 † (7)
- Family Risellidae Kesteven, 1903 accepted as Lacuninae Gray, 1857
- Family Skeneopsidae Iredale, 1915 (4)
- Family Tripartellidae Gründel, 2001 †
- Family Zerotulidae Warén & Hain, 1996 (17)
- 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 (2 309)
- Superfamily Stromboidea Rafinesque, 1815 (835)
- Superfamily Tonnoidea Suter, 1913 (1825) (788)
- Superfamily Truncatelloidea J. E. Gray, 1840 (6 901)
- 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 (23 685)
- Order Stenoglossa accepted as Neogastropoda
- Subclass Gastropoda incertae sedis (308)
- Subclass Heterobranchia (39 154)
- 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