Between brackets is the number of accepted species
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- Mollusca (132 791)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (25 009)
- Class Caudofoveata (143)
- Class Cephalopoda (1 834)
- Class Conchifera accepted as Bivalvia
- Class Cricoconarida † (1)
- Class Gastropoda (102 697)
- Subclass Amphigastropoda † (390)
- Subclass Angiogastropoda represented as Gastropoda
- Subclass Apogastropoda
- Subclass Caenogastropoda (53 636)
- Subterclass Sorbeoconcha (147)
- Superorder Hypsogastropoda
- Order Architaenioglossa (4 918)
- Order Caenogastropoda incertae sedis (7 676)
- Order Littorinimorpha (17 179)
- 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 (1 285)
- 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 (2 311)
- Superfamily Stromboidea Rafinesque, 1815 (835)
- Superfamily Tonnoidea Suter, 1913 (1825) (788)
- Superfamily Truncatelloidea J. E. Gray, 1840 (6 902)
- Family Adeorbidae Monterosato, 1884 accepted as Tornidae Sacco, 1896 (1884)
- Family Amnicolidae Tryon, 1863 (132)
- Family Anabathridae Keen, 1971 (152)
- Family Ascorhiidae Ponder, Nimbs & Shea, 2023 (2)
- Family Assimineidae H. Adams & A. Adams, 1856 (428)
- Family Baicaliidae P. Fischer, 1885 (59)
- Family Beddomeiidae Ponder, Nimbs & Shea, 2023 (58)
- Family Benedictiidae Clessin, 1880 accepted as Benedictiinae Clessin, 1880
- Family Bithyniidae J. E. Gray, 1857 (366)
- Family Bythinellidae Locard, 1893 (213)
- Family Caecidae J. E. Gray, 1850 (286)
- Family Caledoniellidae Rosewater, 1969 (6)
- Family Calopiidae Ponder, 1999 (3)
- Family Circulidae Fretter & Graham, 1962 accepted as Vitrinellidae K. J. Bush, 1897
- Family Clenchiellidae D. W. Taylor, 1966 (14)
- Family Cochliopidae Tryon, 1866 (414)
- Family Coxiellidae Iredale, 1943 accepted as Tomichiidae Wenz, 1938
- Family Ctiloceratidae Iredale & Laseron, 1957 accepted as Ctiloceratinae Iredale & Laseron, 1957
- Family Cyclotropidae Iredale, 1941 accepted as Ekadantinae Thiele, 1929
- Family Elachisinidae Ponder, 1985 (71)
- Family Emmericiidae Brusina, 1870 (46)
- Family Epigridae Ponder, 1985 (4)
- Family Erhaiidae G. M. Davis & Y.-H. Kuo, 1985 (36)
- Family Fairbankiinae Thiele, 1928 accepted as Iravadiidae Thiele, 1928
- Family Falsicingulidae Slavoshevskaya, 1975 (5)
- Family Fontigentidae D. W. Taylor, 1966 (16)
- Family Helicostoidae Pruvot-Fol, 1937 accepted as Helicostoinae Pruvot-Fol, 1937
- Family Hyalidae A. N. Golikov & Starobogatov, 1975 accepted as Iravadiidae Thiele, 1928
- Family Hydrobiidae W. Stimpson, 1865 (2 110)
- Family Hydrococcidae Thiele, 1928 (1)
- Family Iravadiidae Thiele, 1928 (140)
- Family Kolhymamnicolidae Starobogatov, 1983 accepted as Amnicolinae Tryon, 1863
- Family Limnoreidae B. Dybowski, 1911 accepted as Baicaliidae P. Fischer, 1885
- Family Lithoglyphidae Tryon, 1866 (174)
- Family Lithoglyphulidae Radoman, 1973 accepted as Horatiinae D. W. Taylor, 1966
- Family Litthabitellidae Falniowski & Hofman, 2023 (4)
- Family Mesocochliopidae X.-H. Yu, 1987 † (6)
- Family Micromelaniidae B. Dybowski & Grochmalicki, 1913 accepted as Pyrgulinae Brusina, 1882
- Family Micropyrgulidae Radoman, 1973 accepted as Pyrgulinae Brusina, 1882
- Family Moitessieriidae Bourguignat, 1864 (315)
- Family Orientaliidae Radoman, 1973 accepted as Horatiinae D. W. Taylor, 1966
- Family Orientalinidae Radoman, 1978 accepted as Horatiinae D. W. Taylor, 1966
- Family Palaeobaicaliidae Sitnikova & Vinarski, 2023 † (11)
- Family Paludestrinidae R. B. Newton, 1891 accepted as Eatoniellidae Ponder, 1965
- Family Paludinellidae T. Habe, 1976 accepted as Ekadantinae Thiele, 1929
- Family Pomatiopsidae W. Stimpson, 1865 (261)
- Family Potamopyrgidae F. C. Baker, 1928 accepted as Tateidae Thiele, 1925
- Family Pseudomerelininae Starobogatov, 1989 accepted as Iravadiidae Thiele, 1928
- Family Pyrgulidae Brusina, 1882 (1869) accepted as Hydrobiidae W. Stimpson, 1865
- Family Spirostyliferinidae Layton, Middelfart, Tatarnic & N. G. Wilson, 2019 (2)
- Family Squamapicidae L.-J. Zhang & von Rintelen, 2024 (1)
- Family Stenothyridae Tryon, 1866 (123)
- Family Synceratidae Bartsch, 1920 accepted as Assimineinae H. Adams & A. Adams, 1856
- Family Tanousiidae Starobogatov, 1983 accepted as Horatiinae D. W. Taylor, 1966
- Family Tateidae Thiele, 1925 (435)
- Family Teinostomatidae Cossmann, 1917 (111)
- Family Terrestribythinellidae Sitnikova, Starobogatov & V. V. Anistratenko, 1992 accepted as Bythinellidae Locard, 1893
- Family Tomichiidae Wenz, 1938 (29)
- Family Tornidae Sacco, 1896 (1884) (405)
- Subfamily Teinostomatinae Cossmann, 1917 accepted as Teinostomatidae Cossmann, 1917
- Subfamily Torninae Sacco, 1896 (1884)
- Genus Adeorbella Briart & Cornet, 1887 † (4)
- Genus Adeorbis S. V. Wood, 1842 accepted as Tornus W. Turton & Kingston, 1830 (1)
- Genus Alleorus A. M. Strong, 1938 accepted as Discopsis de Folin, 1870
- Genus Anticlimax Pilsbry & McGinty, 1946 (58)
- Genus Aorotrema Schwengel & T. L. McGinty, 1942 (3)
- Genus Canimarina Aguayo & Borro, 1946 accepted as Anticlimax Pilsbry & McGinty, 1946
- Genus Cantaurea Landau, C. M. Silva & Heitz, 2016 † (1)
- Genus Caperella Laseron, 1958 (2)
- Genus Chamlongia Brandt, 1968 (1)
- Genus Circlotoma Laseron, 1958 accepted as Circulus Jeffreys, 1865
- Species Circlotoma bellatula W.-M. Feng, 1996 accepted as Pseudoliotia bellatula (W.-M. Feng, 1996)
- Species Circlotoma callusa Laseron, 1958 accepted as Solariorbis callusa (Laseron, 1958)
- Species Circlotoma planorbis Laseron, 1958 accepted as Circulus planorbis (Laseron, 1958)
- Species Circlotoma rotata Laseron, 1958 accepted as Circulus cinguliferus (A. Adams, 1850)
- Species Circlotoma transculpta Laseron, 1958 accepted as Circulus transculptus (Laseron, 1958)
- Species Circlotoma venusta (Hedley, 1901) accepted as Circulus venustus (Hedley, 1901)
- Genus Circuitus Rubio & Rolán, 2017 (6)
- Genus Circulter Laseron, 1958 (1)
- Genus Climacia Dall, 1903 accepted as Anticlimax Pilsbry & McGinty, 1946
- Genus Climacina Aguayo & Borro, 1946 accepted as Anticlimax Pilsbry & McGinty, 1946
- Genus Cochliolepis W. Stimpson, 1858 (18)
- Genus Cyclostremiscus Pilsbry & Olsson, 1945 (66)
- Genus Discopsis de Folin, 1870 (25)
- Genus Discreliotia Laseron, 1958 accepted as Pseudoliotia Tate, 1898
- Genus Elachorbis Iredale, 1915 accepted as Circulus Jeffreys, 1865
- Genus Episcynia Mörch, 1875 (7)
- Genus Esmeralda Pilsbry & Olsson, 1952 (3)
- Genus Laciniorbis E. von Martens, 1897 (3)
- Genus Liochrysta Laseron, 1958 accepted as Pseudoliotia Tate, 1898
- Genus Lioprora Laseron, 1958 accepted as Anticlimax Pilsbry & McGinty, 1946
- Genus Lophocochlias Pilsbry, 1921 (5)
- Genus Lydiphnis Melvill, 1906 accepted as Circulus Jeffreys, 1865 (7)
- Genus Megatyloma Cossmann, 1888 † (5)
- Genus Miralabrum Pilsbry & Olsson, 1945 accepted as Cyclostremiscus Pilsbry & Olsson, 1945
- Genus Moeniatoma Laseron, 1958 (1)
- Genus Neusas Warén & Bouchet, 2001 (5)
- Genus Ovini Simone, 2013 (1)
- Genus Palatinia Strausz, 1959 †
- Genus Panastoma Pilsbry & Olsson, 1945 (1)
- Genus Parvirota Cossmann, 1902 † accepted as Adeorbella Briart & Cornet, 1887 †
- Genus Parviturboides Pilsbry & T. L. McGinty, 1949 (8)
- Genus Peripitoma Laseron, 1958 (1)
- Genus Pleuromalaxis Pilsbry & T. L. McGinty, 1945 (2)
- Genus Ponocyclus Pilsbry, 1953 accepted as Cyclostremiscus Pilsbry & Olsson, 1945
- Genus Pseudoliotia Tate, 1898 (49)
- Genus Pterolabrella P. A. Maxwell, 1969 † (4)
- Genus Pygmaerota Kuroda & Habe, 1952 accepted as Pygmaeorota Kuroda & Habe, 1954
- Genus Scissilabra Bartsch, 1907 (1)
- Genus Scrupus H. J. Finlay, 1926 (5)
- Genus Solariorbis Conrad, 1865 (58)
- Genus Tornus W. Turton & Kingston, 1830 (35)
- Genus Tuberes Rubio & Rolán, 2017 (8)
- Genus Uzamakiella [sic] accepted as Uzumakiella Habe, 1958
- Genus Uzumakiella Habe, 1958 (3)
- Genus Vitridomus Pilsbry & Olsson, 1945 (2)
- Genus Vitrinorbis Pilsbry & Olsson, 1952 (4)
- Genus Woodringilla Pilsbry & Olsson, 1951 (1)
- Family Truncatellidae J. E. Gray, 1840 (125)
- Family Truncatelloidea incertae sedis (5)
- Family Tutuilanidae Hubendick, 1952 accepted as Omphalotropidinae Thiele, 1927
- Family Vitrinellidae K. J. Bush, 1897 (333)
- Subfamily Fontigentinae D. W. Taylor, 1966 accepted as Fontigentidae D. W. Taylor, 1966
- Subfamily Hemistomiinae Thiele, 1929 accepted as Tateidae Thiele, 1925
- Subfamily Orientalininae Radoman, 1978 accepted as Horatiinae D. W. Taylor, 1966
- Subfamily Stenothyrinae Tryon, 1866 accepted as Stenothyridae Tryon, 1866
- Subfamily Tomichiinae Wenz, 1938 accepted as Tomichiidae Wenz, 1938
- 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 (23 716)
- Order Stenoglossa accepted as Neogastropoda
- Subclass Gastropoda incertae sedis (308)
- Subclass Heterobranchia (39 156)
- 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
