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)
- Family Capulidae J. Fleming, 1822 (192)
- Genus Actita Fischer von Waldheim, 1823 accepted as Capulus Montfort, 1810
- Genus Antitrichotropis A. W. B. Powell, 1951 accepted as Torellia Jeffreys, 1867
- Genus Ariadna P. Fischer, 1864 accepted as Ariadnaria Habe, 1961
- Genus Ariadnaria Habe, 1961 (9)
- Genus Blackdownia Kollmann, 1976 † (1)
- Genus Brocchia Bronn, 1828 accepted as Capulus Montfort, 1810
- Genus Capulonix Iredale, 1929 accepted as Capulus Montfort, 1810
- Genus Capulus Montfort, 1810 (40)
- Genus Cerithioderma Conrad, 1860 (7)
- Genus Ciliatotropis A. N. Golikov, 1986 (3)
- Genus Cryocapulus Schiaparelli, Bouchet, Fassio & Oliverio, 2020 (1)
- Genus Discotrichoconcha A. W. B. Powell, 1951
- Genus Dolichosirius Iredale, 1931 accepted as Sirius Hedley, 1900
- Genus Eosirius P. A. Maxwell, 1966 † accepted as Trichosirius (Eosirius) P. A. Maxwell, 1966 †
- Genus Hyalorisia Dall, 1889 (13)
- Genus Icuncula Iredale, 1924 (4)
- Genus Iphinoe H. Adams & A. Adams, 1856 accepted as Neoiphinoe T. Habe, 1978
- Genus Latticosta S.-I Huang & M.-H. Lin, 2021 (4)
- Genus Lippistes Montfort, 1810 (4)
- Genus Mesostoma Deshayes, 1861 † accepted as Cerithioderma Conrad, 1860
- Genus Neoconcha E. A. Smith, 1907 accepted as Torellia (Neoconcha) E. A. Smith, 1907
- Genus Neoiphinoe T. Habe, 1978 (9)
- Genus Opposirius Iredale, 1931 accepted as Sirius Hedley, 1900
- Genus Pilaeopsis [sic] accepted as Capulus Montfort, 1810
- Genus Pileopsis Lamarck, 1822 accepted as Capulus Montfort, 1810
- Genus Profusinus Bandel, 2000 †
- Genus Separatista Gray, 1847 (3)
- Genus Sirius Hedley, 1900 (13)
- Genus Torellia Jeffreys, 1867 (15)
- Genus Trachysma G. O. Sars, 1878 accepted as Torellia Jeffreys, 1867
- Genus Trichamathina Habe, 1962 (6)
- Genus Trichoconcha E. A. Smith, 1907 accepted as Torellia Jeffreys, 1867
- Genus Trichosirius H. J. Finlay, 1926 (10)
- Genus Trichotropis Broderip & G. B. Sowerby I, 1829 (12)
- Genus Turritropis Habe, 1961 (5)
- Genus Vermeijia Amano, 2019 † (2)
- Genus Verticosta S.-I Huang & M.-H. Lin, 2020 (30)
- Genus Zelippistes H. J. Finlay, 1926 (1)
- Family Cerithiodermatidae Hacobjan, 1976 accepted as Capulidae J. Fleming, 1822
- Family Gyrotropidae Bandel & Dockery, 2012 †
- Family Haloceratidae Warén & Bouchet, 1991 (26)
- Family Lippistidae Iredale, 1924 accepted as Capulidae J. Fleming, 1822
- Family Pileopsidae Chenu, 1859 accepted as Capulidae J. Fleming, 1822
- Family Siriidae Iredale, 1931 accepted as Capulidae J. Fleming, 1822
- Family Trachysmatidae Thiele, 1925 accepted as Capulidae J. Fleming, 1822
- Family Trichotropidae J. E. Gray, 1850 accepted as Capulidae J. Fleming, 1822
- 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)
- 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