Between brackets is the number of accepted species

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- Mollusca (132 848)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (25 011)
- Class Caudofoveata (143)
- Class Cephalopoda (1 834)
- Class Conchifera accepted as Bivalvia
- Class Cricoconarida † (1)
- Class Gastropoda (102 752)
- Subclass Amphigastropoda † (396)
- Subclass Angiogastropoda represented as Gastropoda
- Subclass Apogastropoda
- Subclass Caenogastropoda (53 669)
- Subterclass Sorbeoconcha (147)
- Superorder Hypsogastropoda
- Order Architaenioglossa (4 919)
- Superfamily Ampullarioidea Gray, 1824 (250)
- Superfamily Cyclophoroidea J. E. Gray, 1847 (3 905)
- 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)
- 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 (421)
- Subfamily Liareinae A. W. B. Powell, 1946 (49)
- Subfamily Pupinellinae Kobelt, 1902 (149)
- Subfamily Pupininae L. Pfeiffer, 1853 (197)
- Genus Alpinipupina J. Stanisic, 2010 (1)
- Genus Ambipupina Iredale, 1937 accepted as Necopupina Iredale, 1937
- Genus Callia J. E. Gray, 1840 accepted as Callianella R. B. Newton, 1891
- Genus Callianella R. B. Newton, 1891 (6)
- Genus Chuatienpupa D. S. Do & T. S. Nguyen, 2023 (1)
- Genus Cordillerapina J. Stanisic, 2010 (1)
- Genus Diplopupina Iredale, 1937 accepted as Signepupina Iredale, 1937
- Genus Dolopupina Iredale, 1937 accepted as Signepupina Iredale, 1937
- Genus Estopupina Iredale, 1937 accepted as Necopupina Iredale, 1937
- Genus Eupupina L. Pfeiffer, 1875 accepted as Pupina Vignard, 1829
- Genus Hargravesia H. Adams, 1871 (5)
- Genus Helaposa Iredale, 1941 accepted as Signepupina Iredale, 1937
- Genus Hildapina Iredale, 1940 (2)
- Genus Hyalopsis Pease, 1871 accepted as Hargravesia H. Adams, 1871
- Genus Kanapa Clench, 1949 accepted as Pupina (Kanapa) Clench, 1949 (1)
- Genus Lopupina Iredale, 1937 accepted as Signepupina Iredale, 1937
- Genus Mesostoma Heude, 1886 accepted as Tylotoechus Kobelt & Möllendorff, 1897
- Genus Moulinsia Grateloup, 1840 (19)
- Genus Necopupina Iredale, 1937 (9)
- Genus Parpupina Iredale, 1937 accepted as Signepupina Iredale, 1937
- Genus Porocallia Möllendorff, 1893 (7)
- Genus Pupina Vignard, 1829 (74)
- Genus Pupinesia Clench, 1949 accepted as Pupina (Pupinesia) Clench, 1949
- Genus Pupinoa Clench, 1949 accepted as Pupina (Pupinoa) Clench, 1949 (1)
- Species Pupinoa louisiadensis Clench, 1949
- Genus Signepupina Iredale, 1937 (21)
- Genus Siphonostyla Kobelt, 1897 (2)
- Genus Suavocallia Wenz, 1938 (4)
- Genus Sulapina Maassen & Kittel, 1996 (1)
- Genus Tylotoechus Kobelt & Möllendorff, 1897 (42)
- Subfamily Realiinae L. Pfeiffer, 1853 accepted as Liareinae A. W. B. Powell, 1946
- Genus Badchisestis Korobkov, 1964 † (3)
- Genus Burminella Balashov, Perkovsky & Vasilenko, 2021 † (1)
- Genus Calliopsis Wenz, 1923 † accepted as Protocallia Wenz, 1925 †
- Genus Cretadiostoma T.-T. Yu, D. Zhuo & Páll-Gergely, 2023 † (2)
- Genus Cretatortulosa T. Yu, B. Wang & H. Pan, 2018 † (3)
- Genus Cyclomastoma Hrubesch, 1965 † (1)
- Genus Ischurostoma Bourguignat, 1874 † (12)
- Genus Macropupina D. A. Bullis, Herhold, Czekanski-Moir, Grimaldi & Rundell, 2020 † (1)
- Genus Mellaca Mabille, 1889 accepted as Pseudopomatias Möllendorff, 1885
- Genus Perlisia Tomlin, 1948 accepted as Tortulosa J. E. Gray, 1847
- Genus Praebadchisestis Hrubesch, 1965 † (1)
- Genus Protocallia Wenz, 1925 † (1)
- Genus Regestoma van Hasselt, 1823 accepted as Registoma van Hasselt, 1823
- Genus Registoma van Hasselt, 1823
- Genus Rognacia Oppenheim, 1895 † (1)
- Genus Xenostoma D. A. Bullis, Herhold, Czekanski-Moir, Grimaldi & Rundell, 2020 † accepted as Euthema T. Yu, B. Wang & H. Pan, 2018 †
- 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 (17 189)
- 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