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)
- Subclass Gastropoda incertae sedis (308)
- Subclass Heterobranchia (39 156)
- Infraclass "Lower Heterobranchia" (1 137)
- Infraclass Euthyneura (37 433)
- Subterclass Acteonimorpha (411)
- Subterclass Ringipleura (2 917)
- Subterclass Tectipleura (34 105)
- Superorder Acochlidiimorpha (48)
- Superorder Ascoglossa accepted as Sacoglossa
- Superorder Basommatophora accepted as Hygrophila
- Superorder Eupulmonata (25 569)
- Superorder Hygrophila (2 005)
- Superfamily Acroloxoidea Thiele, 1931 accepted as Lymnaeoidea Rafinesque, 1815
- Superfamily Chilinoidea Dall, 1870 (61)
- Superfamily Lymnaeoidea Rafinesque, 1815 (1 944)
- 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 (1 042)
- Subfamily Ancylinae Rafinesque, 1815 (141)
- Subfamily Miratestinae P. Sarasin & F. Sarasin, 1897 (58)
- Subfamily Planorbidae incertae sedis (57)
- Subfamily Planorbinae Rafinesque, 1815 (785)
- Tribe Camptoceratini Dall, 1870 (8)
- Tribe Coretini J. E. Gray, 1847 (48)
- Genus Coretus J. E. Gray, 1847 accepted as Planorbarius Duméril, 1805
- Species Coretus barettii (Sacco, 1886) † accepted as Planorbarius barettii (Sacco, 1886) †
- Species Coretus belnensis (Tournouër, 1866) † accepted as Planorbarius belnensis (Tournouër, 1866) †
- Species Coretus borellii (Brusina, 1892) † accepted as Planorbarius borellii (Brusina, 1892) †
- Species Coretus choffati (Maillard, 1886) † accepted as Planorbarius choffati (Maillard, 1886) †
- Species Coretus corneus (Linnaeus, 1758) accepted as Planorbarius corneus (Linnaeus, 1758)
- Species Coretus cornu (Brongniart, 1810) † accepted as Planorbarius cornu (Brongniart, 1810) †
- Subspecies Coretus cornu cornu (Brongniart, 1810) † accepted as Planorbarius cornu (Brongniart, 1810) †
- Subspecies Coretus cornu cornucopia (W. H. Baily, 1858) † accepted as Planorbarius cornucopia (W. H. Baily, 1858) †
- Subspecies Coretus cornu heriacensis (Fontannes, 1876) † accepted as Planorbarius heriacensis (Fontannes, 1876) †
- Subspecies Coretus cornu incrassatus (Rambur, 1862) † accepted as Planorbarius incrassatus (Rambur, 1862) †
- Subspecies Coretus cornu mantelli (Dunker, 1848) † accepted as Planorbarius mantelli (Dunker, 1848) †
- Species Coretus crassus (de Serres, 1844) † accepted as Planorbarius crassus (de Serres, 1844) †
- Species Coretus grandis (Halaváts, 1902) † accepted as Planorbarius halavatsi Neubauer, Harzhauser, Kroh, Georgopoulou & Mandic, 2014 †
- Species Coretus heriacensis (Fontannes, 1876) † accepted as Planorbarius heriacensis (Fontannes, 1876) †
- Species Coretus isseli (Sacco, 1886) † accepted as Planorbarius isseli (Sacco, 1886) †
- Species Coretus kittli (Rzehak, 1893) † accepted as Mioplatytaphius kittli (Rzehak, 1893) †
- Species Coretus margoi (Lörenthey, 1894) † accepted as Planorbarius margoi (Lörenthey, 1894) †
- Species Coretus philippei (Locard, 1883) † accepted as Planorbarius philippei (Locard, 1883) †
- Species Coretus praecorneus (P. Fischer & Tournouër, 1873) † accepted as Planorbarius praecorneus (P. Fischer & Tournouër, 1873) †
- Species Coretus radmanesti (T. Fuchs, 1870) † accepted as Fuchsogyra radmanesti (T. Fuchs, 1870) †
- Species Coretus sansaniensis (Noulet, 1854) † accepted as Planorbarius sansaniensis (Noulet, 1854) †
- Species Coretus sulekianus (Brusina, 1874) † accepted as Planorbarius sulekianus (Brusina, 1874) †
- Species Coretus thiollierei [sic] † accepted as Planorbarius thiollieri (Michaud, 1855) †
- Species Coretus turkovici (Gorjanović-Kramberger, 1899) † accepted as Planorbarius turkovici (Gorjanović-Kramberger, 1899) †
- Species Coretus vezici (Brusina, 1897) † accepted as Planorbarius vezici (Brusina, 1897) †
- Genus Planorbarius Duméril, 1805 (48)
- Tribe Drepanotrematini Zilch, 1959 (12)
- Tribe Helisomatini F. C. Baker, 1928 (188)
- Tribe Neoplanorbini Hannibal, 1912 (7)
- Tribe Planorbini Rafinesque, 1815 (445)
- 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 (4 285)
- 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 (1 914)
- 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