Between brackets is the number of accepted species

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- Mollusca (132 467)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (24 907)
- Class Caudofoveata (143)
- Class Cephalopoda (1 813)
- Class Conchifera accepted as Bivalvia
- Class Cricoconarida † (1)
- Class Gastropoda (102 496)
- Subclass Amphigastropoda † (382)
- Subclass Angiogastropoda represented as Gastropoda
- Subclass Apogastropoda
- Subclass Caenogastropoda (53 463)
- Subclass Gastropoda incertae sedis (308)
- Subclass Heterobranchia (39 144)
- Infraclass "Lower Heterobranchia" (1 137)
- Infraclass Euthyneura (37 421)
- Subterclass Acteonimorpha (411)
- Subterclass Ringipleura (2 916)
- Subterclass Tectipleura (34 094)
- Superorder Acochlidiimorpha (48)
- Superorder Ascoglossa accepted as Sacoglossa
- Superorder Basommatophora accepted as Hygrophila
- Superorder Eupulmonata (25 561)
- Superorder Hygrophila (2 004)
- Superfamily Acroloxoidea Thiele, 1931 accepted as Lymnaeoidea Rafinesque, 1815
- Superfamily Chilinoidea Dall, 1870 (61)
- Superfamily Lymnaeoidea Rafinesque, 1815 (1 943)
- Family Acroloxidae Thiele, 1931 (58)
- Family Ancylidae Rafinesque, 1815 accepted as Ancylinae Rafinesque, 1815
- Family Bulinidae P. Fischer & Crosse, 1880 (72)
- Family Burnupiidae Albrecht, 2017 (22)
- Family Clivunellidae Kochansky-Devidé & Slišković, 1972 † (4)
- Family Laevapicidae Hannibal, 1914 accepted as Planorbidae Rafinesque, 1815
- Family Lancidae Hannibal, 1914 accepted as Lancini Hannibal, 1914
- Family Limnophysidae W. Dybowski, 1903 accepted as Lymnaeidae Rafinesque, 1815
- Family Lymnaeidae Rafinesque, 1815 (536)
- Family Physidae Fitzinger, 1833 (210)
- Family Planorbidae Rafinesque, 1815 (1 041)
- Subfamily Ancylinae Rafinesque, 1815 (141)
- Subfamily Miratestinae P. Sarasin & F. Sarasin, 1897 (58)
- Subfamily Planorbidae incertae sedis (57)
- Subfamily Planorbinae Rafinesque, 1815 (784)
- Tribe Camptoceratini Dall, 1870 (8)
- Tribe Coretini J. E. Gray, 1847 (48)
- Tribe Drepanotrematini Zilch, 1959 (12)
- Tribe Helisomatini F. C. Baker, 1928 (188)
- Tribe Neoplanorbini Hannibal, 1912 (7)
- Tribe Planorbini Rafinesque, 1815 (444)
- Genus Africanogyrus Özdikmen & Darılmaz, 2007 accepted as Hovorbis D. S. Brown & Mandahl-Barth, 1973
- Genus Afrogyrorbis Starobogatov, 1967 (13)
- Genus Afrogyrus D. S. Brown & Mandahl-Barth, 1973 accepted as Hovorbis D. S. Brown & Mandahl-Barth, 1973
- Genus Anisus S. Studer, 1820 (48)
- Genus Armiger Hartmann, 1843 (15)
- Subgenus Armiger (Baicaloarmiger) B. Dybowski & Grochmalicki, 1920 accepted as Choanomphalus Gerstfeldt, 1859
- Species Armiger ambiguus Popova, 1981 †
- Species Armiger annandalei (Germain, 1918)
- Species Armiger bakeri Prozorova & Starobogatov, 1996
- Species Armiger bielzi (Kimakowicz, 1884)
- Species Armiger crista (Linnaeus, 1758)
- Species Armiger cristaeformis Gozhik & Prysjazhnjuk, 1978 †
- Species Armiger decorus Roshka, 1973 †
- Species Armiger eurasiaticus Prozorova & Starobogatov, 1996
- Species Armiger exigua A. B. Leonard, 1972 accepted as Armiger crista (Linnaeus, 1758)
- Species Armiger geniculatus (F. Sandberger, 1872) †
- Species Armiger gracilis Gozhik & Prysjazhnjuk, 1978 † accepted as Gyraulus gracilis (Gozhik & Prysjazhnjuk, 1978) †
- Species Armiger jankowskajae Izzatullaev, 1984
- Species Armiger khoresmicus Prozorova & Starobogatov, 1996
- Species Armiger lenapalus (Bourguignat, 1881) †
- Species Armiger lluecai (Royo Gómez, 1922) †
- Species Armiger nautiliformis Gozhik & Prysjazhnjuk, 1978 †
- Species Armiger planoconvexus Popova & Starobogatov, 1970 †
- Species Armiger schamaricus Izzatullaev, 1972
- Species Armiger subcostatus Yen, 1946 †
- Subspecies Armiger subcostatus obsoletus Yen, 1946 †
- Subspecies Armiger subcostatus subcostatus Yen, 1946 †
- Species Armiger subptychophorus (Halaváts, 1902) †
- Species Armiger tshuicus Popova & Starobogatov, 1970 †
- Genus Bathyomphalus Charpentier, 1837 (7)
- Genus Caillaudia Bourguignat, 1883 accepted as Gyraulus (Caillaudia) Bourguignat, 1883
- Genus Ceratophallus D. S. Brown & Mandahl-Barth, 1973 accepted as Afrogyrorbis Starobogatov, 1967
- Genus Choanomphalodes Lindholm, 1927 accepted as Gyraulus (Choanomphalodes) Lindholm, 1927
- Genus Choanomphalus Gerstfeldt, 1859 (28)
- Genus Discoidina Stein, 1850 accepted as Bathyomphalus Charpentier, 1837
- Genus Glyptanisus Iredale, 1943 accepted as Gyraulus (Gyraulus) Charpentier, 1837
- Genus Gyraulus Charpentier, 1837 (268)
- Genus Hovorbis D. S. Brown & Mandahl-Barth, 1973 (4)
- Genus Lamorbis Starobogatov, 1967 accepted as Gyraulus (Lamorbis) Starobogatov, 1967 (3)
- Genus Odontogyrorbis Lörenthey, 1906 † accepted as Anisus S. Studer, 1820
- Genus Omphalocrypta Tomlin, 1929 accepted as Choanomphalus Gerstfeldt, 1859
- Genus Orygoceras Brusina, 1882 † (14)
- Genus Paraspira Dall, 1905 accepted as Anisus S. Studer, 1820
- Genus Plananisus Iredale, 1943 accepted as Gyraulus Charpentier, 1837
- Genus Planaria T. Brown, 1827 accepted as Trochlea Haldeman, 1842
- Genus Planorbis O. F. Müller, 1773 (44)
- Genus Polygyrus Gray, 1847 accepted as Bathyomphalus Charpentier, 1837
- Genus Pseudocarinogyraulus Popova & Starobogatov, 1970 † accepted as Anisus (Pseudocarinogyraulus) Popova & Starobogatov, 1970 †
- Genus Ptychospira Slavík, 1869 † accepted as Gyraulus Charpentier, 1837
- Genus Pygmanisus Iredale, 1943 accepted as Gyraulus Charpentier, 1837
- Genus Spiralina E. von Martens, 1899 accepted as Anisus (Disculifer) C. R. Boettger, 1944
- Genus Spirulina [sic] accepted as Spiralina E. von Martens, 1899
- Genus Trochlea Haldeman, 1842 accepted as Gyraulus Charpentier, 1837
- Genus Tropidiscus Stein, 1850 accepted as Planorbis O. F. Müller, 1773
- Genus Valvatomphalus B. Dybowski & Grochmalicki, 1925 accepted as Choanomphalus Gerstfeldt, 1859
- Tribe Segmentinini F. C. Baker, 1945 (77)
- Genus Jaroslavia Zharnyl'skaya, 1965 † accepted as Proplanorbis Starobogatov, 1967 †
- Subfamily Rhodacmeinae B. Walker, 1917 accepted as Ancylini Rafinesque, 1815
- Subfamily Segmentininae F. C. Baker, 1945 accepted as Segmentinini F. C. Baker, 1945
- Genus Hypsogyra Lindholm, 1927 accepted as Planorbella Haldeman, 1843
- Genus Theratodocion D. S. Brown & Verdcourt, 1998 (1)
- Genus Zalophancylus Hannibal, 1912 †
- Family Rhodacmeidae B. Walker, 1917 accepted as Ancylinae Rafinesque, 1815
- Superfamily Planorboidea Rafinesque, 1815 accepted as Lymnaeoidea Rafinesque, 1815
- Superorder Pneumopulmonata
- Superorder Pylopulmonata (4 283)
- Superorder Sacoglossa (391)
- Superorder Siphonarimorpha (163)
- Order Anaspidea accepted as Aplysiida
- Order Aplysiida (101)
- Order Aplysiomorpha accepted as Aplysiida
- Order Archaeopulmonata accepted as Siphonarioidea Gray, 1827
- Order Bullomorpha accepted as Cephalaspidea
- Order Cephalaspidea (1 034)
- Order Heterostropha accepted as Pyramidellidae J. E. Gray, 1840
- Order Pteropoda (414)
- Order Runcinacea accepted as Runcinida
- Order Runcinida (80)
- Order Tectibranchiata
- Order Thecosomata
- Order Umbraculida (15)
- Superorder Euthyneura incertae sedis
- Infraclass Heterobranchia incertae sedis (478)
- Infraclass Mesoneura (108)
- Infraclass Opisthobranchia
- Infraclass Pulmonata
- Subclass Neomphaliones accepted as Vetigastropoda
- Subclass Neritimorpha (1 908)
- Subclass Orthogastropoda represented as Gastropoda
- Subclass Patellogastropoda (510)
- Subclass Prosobranchia
- Subclass Psilogastropoda represented as Gastropoda
- Subclass Vetigastropoda (6 781)
- 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