Between brackets is the number of accepted species
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- Mollusca (132 851)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (25 013)
- Class Caudofoveata (143)
- Class Cephalopoda (1 834)
- Class Conchifera accepted as Bivalvia
- Class Cricoconarida † (1)
- Class Gastropoda (102 753)
- Subclass Amphigastropoda † (396)
- Subclass Angiogastropoda represented as Gastropoda
- Subclass Apogastropoda
- Subclass Caenogastropoda (53 670)
- Subterclass Sorbeoconcha (147)
- Superorder Hypsogastropoda
- Order Architaenioglossa (4 919)
- Order Caenogastropoda incertae sedis (7 677)
- Order Littorinimorpha (17 189)
- 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 (1 294)
- 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)
- Subfamily Abbottellinae Watters, 2016 (132)
- Subfamily Annulariinae J. B. Henderson & Bartsch, 1920 (84)
- Subfamily Chondropomatinae J. B. Henderson & Bartsch, 1920 (263)
- Subfamily Licininae J. E. Gray, 1857 accepted as Tudorinae Watters, 2006
- Subfamily Rhytidopomatinae J. B. Henderson & Bartsch, 1920 (46)
- Subfamily Tudorinae Watters, 2006 (187)
- Genus Annularita J. B. Henderson & Bartsch, 1920 (1)
- Species Annularita majuscula (Morelet, 1851)
- Subspecies Annularita majuscula catalinensis (C. de la Torre & Bartsch, 1941)
- Subspecies Annularita majuscula crassilabris (C. de la Torre & Bartsch, 1941)
- Subspecies Annularita majuscula cumbrensis (C. de la Torre & Bartsch, 1941)
- Subspecies Annularita majuscula excelsa (C. de la Torre & Bartsch, 1941)
- Subspecies Annularita majuscula macta (Poey, 1852)
- Subspecies Annularita majuscula mactra [sic] accepted as Annularita majuscula macta (Poey, 1852)
- Subspecies Annularita majuscula majuscula (Morelet, 1851)
- Subspecies Annularita majuscula milarai (Jaume, 1984)
- Subspecies Annularita majuscula narcisi (C. de la Torre & Bartsch, 1941)
- Genus Articulipoma Bartsch, 1946 (9)
- Genus Choanopomops H. B. Baker, 1928 (1)
- Genus Chondropomartes J. B. Henderson & Bartsch, 1920 (3)
- Genus Chondropomella Bartsch, 1932 (3)
- Genus Chondropometes J. B. Henderson & Bartsch, 1920 (12)
- Genus Chondropomium J. B. Henderson & Bartsch, 1920 (10)
- Genus Chondrothyra J. B. Henderson & Bartsch, 1920 (33)
- Genus Chondrothyrella C. de la Torre & Bartsch, 1938 accepted as Chondrothyra (Chondrothyrella) C. de la Torre & Bartsch, 1938
- Genus Chondrothyretes J. B. Henderson & Bartsch, 1920 accepted as Chondrothyra J. B. Henderson & Bartsch, 1920
- Genus Chondrothyroma J. B. Henderson & Bartsch, 1920 accepted as Chondropometes J. B. Henderson & Bartsch, 1920
- Genus Clydonopoma Pilsbry, 1933 (9)
- Genus Colobostylus Crosse & P. Fischer, 1888 (18)
- Genus Dallsiphona C. de la Torre & Bartsch, 1941 (1)
- Genus Eutudora J. B. Henderson & Bartsch, 1920 (10)
- Genus Eutudorella J. B. Henderson & Bartsch, 1920 accepted as Eutudora J. B. Henderson & Bartsch, 1920
- Genus Eutudorisca J. B. Henderson & Bartsch, 1920 accepted as Eutudora J. B. Henderson & Bartsch, 1920
- Genus Eutudorops J. B. Henderson & Bartsch, 1920 accepted as Ramsdenia Preston, 1913
- Genus Fossularia C. de la Torre & Bartsch, 1941 accepted as Eutudora (Annularodella) C. de la Torre & Bartsch, 1941
- Genus Gouldipoma Watters, 2006 (14)
- Genus Graypoma Bartsch, 1946 accepted as Licina J. E. Gray, 1847
- Genus Gundlachtudora C. de la Torre & Bartsch, 1941 accepted as Tudora J. E. Gray, 1850
- Genus Gutierrezium C. de la Torre & Bartsch, 1938 (7)
- Genus Halotudora Watters, 2006 (7)
- Genus Hendersonina C. de la Torre & Bartsch, 1938 accepted as Turrithyra C. de la Torre & Bartsch, 1938
- Genus Kisslingia Bartsch, 1946 accepted as Licina J. E. Gray, 1847
- Genus Licina J. E. Gray, 1847 (14)
- Genus Paradoxipoma Watters, 2014 (1)
- Genus Plicathyrella C. de la Torre & Bartsch, 1938 accepted as Chondrothyra (Chondrothyrella) C. de la Torre & Bartsch, 1938
- Genus Sallepoma Bartsch, 1946 (6)
- Genus Samanicola Watters, 2006 (2)
- Genus Superbipoma Watters & Larson, 2017 (2)
- Genus Tudora J. E. Gray, 1850 (8)
- Genus Tudorata H. B. Baker, 1924 accepted as Tudora J. E. Gray, 1850
- Genus Tudorellata J. B. Henderson & Bartsch, 1920 accepted as Annularisca (Annularella) J. B. Henderson & Bartsch, 1920
- Genus Tudorina C. de la Torre & Bartsch, 1941 (1)
- Genus Tudorisca J. B. Henderson & Bartsch, 1920 (3)
- Genus Turrithyra C. de la Torre & Bartsch, 1938 (12)
- Genus Turrithyretes C. de la Torre & Bartsch, 1938 accepted as Turrithyra C. de la Torre & Bartsch, 1938
- Genus Incertipoma Bartsch, 1946 (1)
- Genus Tessaripoma Watters, 2016 (3)
- 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)
- 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 (2 312)
- 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 (23 738)
- Order Stenoglossa accepted as Neogastropoda
- Subclass Gastropoda incertae sedis (308)
- Subclass Heterobranchia (39 172)
- 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
