Between brackets is the number of accepted species

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- Mollusca (133 306)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (25 080)
- Class Caudofoveata (143)
- Class Cephalopoda (1 921)
- Class Conchifera accepted as Bivalvia
- Class Cricoconarida † (1)
- Class Gastropoda (103 048)
- Subclass Amphigastropoda † (434)
- Subclass Angiogastropoda represented as Gastropoda
- Subclass Apogastropoda
- Subclass Caenogastropoda (53 848)
- Subterclass Sorbeoconcha (147)
- Superorder Hypsogastropoda
- Order Architaenioglossa (4 921)
- Order Caenogastropoda incertae sedis (7 722)
- 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)
- 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)
- 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)
- Genus Dickdellia Warén & Hain, 1996 (1)
- Genus Frigidilacuna Tomlin, 1930 accepted as Frovina Thiele, 1912
- Genus Frovina Thiele, 1912 (3)
- Species Frovina angularis Warén & Hain, 1996
- Species Frovina indecora (Thiele, 1912)
- Species Frovina soror Thiele, 1912
- Genus Prolacuna Thiele, 1913 accepted as Frovina Thiele, 1912
- Genus Pseudonatica Simone, 2018 (2)
- Genus Sublacuna Thiele, 1912 accepted as Frovina Thiele, 1912
- Genus Trilirata Warén & Hain, 1996 (4)
- Genus Zerotula H. J. Finlay, 1926 (7)
- Superfamily Naticoidea Guilding, 1834 (689)
- 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 (2 310)
- Superfamily Stromboidea Rafinesque, 1815 (839)
- Superfamily Tonnoidea Suter, 1913 (1825) (787)
- Superfamily Truncatelloidea J. E. Gray, 1840 (6 935)
- Superfamily Vanikoroidea Gray, 1840 (1 330)
- 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 (39 231)
- Subclass Neomphaliones accepted as Vetigastropoda
- Subclass Neritimorpha (1 916)
- Subclass Orthogastropoda represented as Gastropoda
- Subclass Patellogastropoda (517)
- 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 (754)
- Class Solenoconchia accepted as Scaphopoda
- Class Solenogastres (313)
- Subclass Chaetodermomorpha accepted as Caudofoveata