Between brackets is the number of accepted species
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- Mollusca (133 046)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (25 043)
- Class Caudofoveata (143)
- Class Cephalopoda (1 863)
- Class Conchifera accepted as Bivalvia
- Class Cricoconarida † (1)
- Class Gastropoda (102 884)
- Subclass Amphigastropoda † (414)
- Subclass Angiogastropoda represented as Gastropoda
- Subclass Apogastropoda
- Subclass Caenogastropoda (53 764)
- 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)
- 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)
- Subfamily Diplommatininae L. Pfeiffer, 1856 (580)
- Subfamily Laotiinae Páll-Gergely, 2024 (5)
- Genus Laotia Saurin, 1953 (3)
- Genus Messageria Bavay & Dautzenberg, 1904 (2)
- Species Messageria scalarioides (Bavay & Dautzenberg, 1904)
- Subspecies Messageria scalarioides donghiana Z.-Y. Chen & L.-W. Lin, 2021
- Subspecies Messageria scalarioides scalarioides (Bavay & Dautzenberg, 1904)
- Species Messageria sinica Z.-Y. Chen & L.-W. Lin, 2021
- Genus Anostomella E. von Martens, 1867 accepted as Palaina O. Semper, 1865
- Genus Cardiostoma F. Sandberger, 1870 † (2)
- Genus Cylindropalaina Möllendorff, 1897 accepted as Palaina O. Semper, 1865
- Genus Diancta E. von Martens, 1864 (24)
- Genus Eclogarinia Wenz, 1939 (1)
- Genus Eclogarinia Iredale, 1933 accepted as Eclogarinia Wenz, 1939
- Genus Entypogyra Hrubesch, 1965 † (1)
- Genus Eudiplommatina Kobelt & Möllendorff, 1898 accepted as Diplommatininae L. Pfeiffer, 1856
- Genus Eupalaina Kobelt & Möllendorff, 1898 accepted as Palaina (Eupalaina) Kobelt & Möllendorff, 1898
- Genus Euthema T. Yu, B. Wang & H. Pan, 2018 † (8)
- Genus Fermepalaina Iredale, 1945 (2)
- Genus Gastroptychia Kobelt & Möllendorff, 1900 (11)
- Genus Geothauma Crosse, 1893 accepted as Plectostoma H. Adams, 1865
- Genus Habeastrum Simone, 2019 (3)
- Genus Helicomorpha Möllendorff, 1890 (9)
- Genus Hungerfordia R. H. Beddome, 1889 (41)
- Genus Kontschania Páll-Gergely & Grego, 2020 (1)
- Genus Luzonocoptis Páll-Gergely & Hunyadi, 2017 (2)
- Genus Macropalaina Möllendorff, 1897 accepted as Palaina O. Semper, 1865
- Genus Moderata Páll-Gergely, 2020 (1)
- Genus Moussonia O. Semper, 1865 (24)
- Genus Niahia Vermeulen, 1996 (1)
- Genus Nicida W. T. Blanford, 1868 (14)
- Genus Notharinia Vermeulen, Phung & Truong, 2007 (12)
- Genus Occidentina Harzhauser & Neubauer, 2018 † (2)
- Genus Palaina O. Semper, 1865 (180)
- Genus Paleodiplommatina D. A. Bullis, Herhold, Czekanski-Moir, Grimaldi & Rundell, 2020 † accepted as Euthema T. Yu, B. Wang & H. Pan, 2018 †
- Genus Palmatina Iredale, 1944 (3)
- Genus Paradiancta Möllendorff, 1895 (1)
- Genus Paxillus H. Adams & A. Adams, 1851 accepted as Gastroptychia Kobelt & Möllendorff, 1900
- Genus Plectostoma H. Adams, 1865 (82)
- Genus Pseudonicida Hrubesch, 1965 † (1)
- Genus Pugnellia Oppenheim, 1895 † (1)
- Genus Pulchraspira T. Yu, Salvador & Jarzembowski, 2021 † (1)
- Genus Pupoidea Pease, 1865 accepted as Palaina O. Semper, 1865
- Genus Sinoarinia Z.-Y. Chen & M. Wu, 2020 (4)
- Genus Sohtsuia Z.-Y. Chen, 2023 (1)
- Genus Styx Oppenheim, 1895 † (1)
- Genus Velepalaina Iredale, 1937 (5)
- Genus Whittenia T.-S. Liew & Clements, 2020 (2)
- 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 (7 676)
- Order Littorinimorpha (17 219)
- Order Neogastropoda (23 802)
- Order Stenoglossa accepted as Neogastropoda
- Subclass Gastropoda incertae sedis (309)
- Subclass Heterobranchia (39 186)
- 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 (6 783)
- 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 (753)
- Class Solenoconchia accepted as Scaphopoda
- Class Solenogastres (313)
- Subclass Chaetodermomorpha accepted as Caudofoveata
