Between brackets is the number of accepted species

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- Mollusca (132 950)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (25 036)
- Class Caudofoveata (143)
- Class Cephalopoda (1 845)
- Class Conchifera accepted as Bivalvia
- Class Cricoconarida † (1)
- Class Gastropoda (102 818)
- Subclass Amphigastropoda † (408)
- Subclass Angiogastropoda represented as Gastropoda
- Subclass Apogastropoda
- Subclass Caenogastropoda (53 710)
- Subterclass Sorbeoconcha (147)
- Superorder Hypsogastropoda
- Order Architaenioglossa (4 920)
- Superfamily Ampullarioidea Gray, 1824 (250)
- Superfamily Cyclophoroidea J. E. Gray, 1847 (3 906)
- Family Aciculidae J. E. Gray, 1850 (104)
- Family Acmeidae Pollonera, 1905 accepted as Aciculidae J. E. Gray, 1850
- Family Alycaeidae W. T. Blanford, 1864 accepted as Alycaeinae W. T. Blanford, 1864
- Family Bolaniidae Wenz, 1915 accepted as Craspedopomatidae Kobelt & Möllendorff, 1898
- Family Cochlostomatidae Kobelt, 1902 (118)
- Family Craspedopomatidae Kobelt & Möllendorff, 1898 (21)
- Family Cyclophoridae J. E. Gray, 1847 (1 604)
- Subfamily Alycaeinae W. T. Blanford, 1864 (370)
- Subfamily Craspedopomatinae Kobelt & Möllendorff, 1898 accepted as Craspedopomatidae Kobelt & Möllendorff, 1898
- Subfamily Cyclophoridae incertae sedis (36)
- Subfamily Cyclophorinae J. E. Gray, 1847 (1 105)
- Tribe Caspicyclotini Wenz, 1938 (4)
- Genus Caspicyclotus Forcart, 1935 (4)
- Tribe Cyathopomatini Kobelt & Möllendorff, 1897 (134)
- Tribe Cyclophorini J. E. Gray, 1847 (672)
- Tribe Cyclotini L. Pfeiffer, 1853 (162)
- Tribe Pterocyclini Kobelt & Möllendorff, 1897 (126)
- Genus Aulopoma Troschel, 1847 (4)
- Genus Pholeoteras Sturany, 1904 (3)
- Subfamily Ferussininae Wenz, 1923 (1915) † (8)
- Subfamily Platyrhaphidinae Páll-Gergely, 2024 (76)
- Subfamily Spirostomatinae Tielecke, 1940 (4)
- Genus Allardia Nicolas, 1898 †
- Genus Diaspira Soós, 1911 accepted as Ditropopsis E. A. Smith, 1897
- Genus Eotrichophorus D. A. Bullis, Herhold, Czekanski-Moir, Grimaldi & Rundell, 2020 † (2)
- Genus Lagochilus P. Fischer, 1885 accepted as Lagocheilus W. T. Blanford, 1864
- Genus Lagochilus W. T. Blanford, 1864 accepted as Lagocheilus W. T. Blanford, 1864
- Genus Perissocyclos D. A. Bullis, Herhold, Czekanski-Moir, Grimaldi & Rundell, 2020 † (1)
- Genus Strophites J. W. Dawson, 1880 † accepted as Dendropupa R. Owen, 1859 †
- Genus Trotopyrgula X.-H. Yu, 1987 † (2)
- Family Cytoridae Climo, 1969 accepted as Liareinae A. W. B. Powell, 1946
- Family Dicristidae A. N. Golikov & Starobogatov, 1975 accepted as Neocyclotidae Kobelt & Möllendorff, 1897
- Family Diplommatinidae L. Pfeiffer, 1856 (1 026)
- Family Ferussinidae Wenz, 1923 (1915) † accepted as Ferussininae Wenz, 1923 (1915) †
- Family Hainesiidae Thiele, 1929 (220)
- Family Lagocheilidae Stoliczka, 1872 accepted as Cyclophoridae J. E. Gray, 1847
- Family Maizaniidae Tielecke, 1940 (40)
- Family Megalomastomatidae W. T. Blanford, 1864 (100)
- Family Megalostomatidae [sic] accepted as Megalomastomatidae W. T. Blanford, 1864
- Family Neocyclotidae Kobelt & Möllendorff, 1897 (242)
- Family Pollicariidae Thiele, 1929 (6)
- Family Pupinidae L. Pfeiffer, 1853 (422)
- Family Strophostomatidae Wenz, 1915 † accepted as Ferussininae Wenz, 1923 (1915) †
- Genus Carinomphalus W. Yü, 1974 † (1)
- Genus Diplommoptychia Maillard, 1884 †
- Genus Loriolina Huckriede, 1967 † (1)
- Genus Maillardinus Bandel, 1991 † (1)
- Superfamily Viviparoidea Gray, 1847 (764)
- Order Caenogastropoda incertae sedis (7 677)
- Order Littorinimorpha (17 189)
- Order Neogastropoda (23 777)
- Order Stenoglossa accepted as Neogastropoda
- Subclass Gastropoda incertae sedis (309)
- Subclass Heterobranchia (39 179)
- Subclass Neomphaliones accepted as Vetigastropoda
- Subclass Neritimorpha (1 914)
- Subclass Orthogastropoda represented as Gastropoda
- Subclass Patellogastropoda (514)
- Subclass Prosobranchia
- Subclass Psilogastropoda represented as Gastropoda
- Subclass Vetigastropoda (6 784)
- 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