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)
- Subfamily Acellinae Hannibal, 1912 accepted as Lymnaeinae Rafinesque, 1815
- Subfamily Amphipepleinae Pini, 1877 (167)
- Subfamily Lancinae Hannibal, 1914 accepted as Lancini Hannibal, 1914
- Subfamily Lymnaeinae Rafinesque, 1815 (313)
- Tribe Lancini Hannibal, 1914 (8)
- Tribe Lymnaeinae incertae sedis (151)
- Genus Acella Haldeman, 1841 (6)
- Genus Bulimnea Haldeman, 1841 (3)
- Genus Dallirhytis Kruglov & Starobogatov, 1989 (1)
- Genus Erinna H. Adams & A. Adams, 1855 (2)
- Genus Galba Schrank, 1803 (101)
- Genus Hinkleyia F. C. Baker, 1928 (2)
- Genus Ladislavella B. Dybowski, 1913 (28)
- Genus Pectinidens Pilsbry, 1911 (1)
- Genus Polyrhytis Meek, 1876 † (1)
- Genus Pseudisidora Thiele, 1931 (3)
- Subgenus Pseudisidora (Pseudisidora) Thiele, 1931 represented as Pseudisidora Thiele, 1931
- Subgenus Pseudisidora (Pseudobulinus) Kruglov & Starobogatov, 1993 represented as Pseudisidora Thiele, 1931
- Species Pseudisidora producta (Mighels, 1845)
- Species Pseudisidora reticulata (A. Gould, 1847)
- Species Pseudisidora rubella (I. Lea, 1841)
- Genus Pseudosuccinea F. C. Baker, 1908 (2)
- Genus Walterigalba Kruglov & Starobogatov, 1985 (1)
- Tribe Lymnaeini Rafinesque, 1815 (145)
- Tribe Omphiscolini Bolotov, Vinarski & Aksenova, 2023 (9)
- Genus Bakerilymnaea Weyrauch, 1964 accepted as Galba (Bakerilymnaea) Weyrauch, 1964
- Genus Berlaniana Kruglov & Starobogatov, 1986 accepted as Stagnicola Jeffreys, 1830
- Genus Catascopia Meier-Brook & Bargues, 2002 accepted as Ladislavella B. Dybowski, 1913
- Genus Corvusiana Servain, 1882 accepted as Stagnicola (Corvusiana) Servain, 1882
- Genus Costolimnaea B. Dybowski, 1913 accepted as Stagnicola Jeffreys, 1830
- Genus Fossaria Westerlund, 1885 accepted as Galba Schrank, 1803
- Genus Leptolimnaea Tryon, 1884 accepted as Omphiscola Rafinesque, 1819
- Genus Limnaea Blainville, 1824 accepted as Lymnaea Lamarck, 1799
- Genus Limnaeus C. Pfeiffer, 1821 accepted as Lymnaea Lamarck, 1799
- Genus Limnea accepted as Lymnaea Lamarck, 1799
- Genus Limneus F. Sandberger, 1875 accepted as Lymnaea Lamarck, 1799
- Genus Limneus Draparnaud, 1801 accepted as Lymnaea Lamarck, 1799
- Genus Limnoea [sic] accepted as Lymnaea Lamarck, 1799
- Genus Limnophysa Fitzinger, 1833 accepted as Stagnicola Jeffreys, 1830
- Genus Lymanaea [sic] accepted as Lymnaea Lamarck, 1799
- Genus Lymnaeus [sic] accepted as Lymnaea Lamarck, 1799
- Genus Lymnea [sic] accepted as Lymnaea Lamarck, 1799
- Genus Lymneus A. Férussac, 1807 accepted as Lymnaea Lamarck, 1799
- Genus Lymnoea [sic] accepted as Lymnaea Lamarck, 1799
- Genus Lymnoeus Michelin, 1831 accepted as Lymnaea Lamarck, 1799
- Genus Lymnula Rafinesque, 1819 accepted as Lymnaea Lamarck, 1799
- Genus Lymnus Montfort, 1810 accepted as Lymnaea Lamarck, 1799
- Genus Microlimnaea W. Dybowski, 1908 accepted as Stagnicola Jeffreys, 1830
- Genus Palustria W. Dybowski, 1908 accepted as Stagnicola Jeffreys, 1830
- Genus Peplimnea Iredale, 1943 accepted as Bullastra Bergh, 1901
- Genus Sphaerogalba Kruglov & Starobogatov, 1985 accepted as Hinkleyia F. C. Baker, 1928
- Genus Turrilimnaea W. Dybowski, 1908 accepted as Stagnicola Jeffreys, 1830
- Genus Walhiana Servain, 1882 accepted as Limnaea Blainville, 1824
- Subfamily Radicinae Vinarski, 2013 accepted as Radicini Vinarski, 2013
- Subfamily Valencienniinae Gorjanović-Kramberger, 1923 † (36)
- Genus Delminiella Kochansky-Devidé & Slišković, 1972 † (3)
- Genus Eosuccinea X.-H. Yu, 1987 † (5)
- Genus Hiscerus Gorjanović-Kramberger, 1923 † (2)
- Genus Leptolimnea Swainson, 1840 accepted as Omphiscola Rafinesque, 1819
- Genus Limnoperegra Chiamenti, 1899
- Genus Limnoturgida Chiamenti, 1899 accepted as Lymnaea Lamarck, 1799
- Genus Lutea T. Brown, 1827
- Genus Lutrilimnea D. W. Taylor, 1981 † (3)
- Genus Pleurolimnaea Meek, 1866 † (4)
- Genus Telankhedilymnaea Delvene, Munt, S. Paul & Gangopadhyay, 2024 † (1)
- Genus Velutinellus Marinescu, 1970 † (2)
- Family Physidae Fitzinger, 1833 (210)
- Family Planorbidae Rafinesque, 1815 (1 042)
- 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