Between brackets is the number of accepted species

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- Mollusca (133 259)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (25 079)
- Class Caudofoveata (143)
- Class Cephalopoda (1 917)
- Class Conchifera accepted as Bivalvia
- Class Cricoconarida † (1)
- Class Gastropoda (103 007)
- Subclass Amphigastropoda † (434)
- Subclass Angiogastropoda represented as Gastropoda
- Subclass Apogastropoda
- Subclass Caenogastropoda (53 817)
- Subclass Gastropoda incertae sedis (313)
- Subclass Heterobranchia (39 224)
- Infraclass "Lower Heterobranchia" (1 139)
- Infraclass Euthyneura (37 498)
- Subterclass Acteonimorpha (413)
- Subterclass Ringipleura (2 917)
- Subterclass Tectipleura (34 168)
- Superorder Acochlidiimorpha (48)
- Superorder Ascoglossa accepted as Sacoglossa
- Superorder Basommatophora accepted as Hygrophila
- Superorder Eupulmonata (25 623)
- Superorder Hygrophila (2 009)
- Superfamily Acroloxoidea Thiele, 1931 accepted as Lymnaeoidea Rafinesque, 1815
- Superfamily Chilinoidea Dall, 1870 (61)
- Superfamily Lymnaeoidea Rafinesque, 1815 (1 948)
- 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 (538)
- Subfamily Acellinae Hannibal, 1912 accepted as Lymnaeinae Rafinesque, 1815
- Subfamily Amphipepleinae Pini, 1877 (167)
- Tribe Amphipepleini Pini, 1877 (3)
- Tribe Austropepleini Bolotov, Vinarski & Aksenova, 2023 (17)
- Tribe Peregrianini Bolotov, Vinarski & Aksenova, 2023 (15)
- Tribe Radicini Vinarski, 2013 (104)
- Tribe Radicini incertae sedis (2)
- Tribe Tibetoradicini Bolotov, Vinarski & Aksenova, 2023 (6)
- Genus Adelina Cantraine, 1841 † accepted as Corymbina Bukowski, 1892 †
- Genus Adelinella Wenz, 1922 † accepted as Corymbina Bukowski, 1892 †
- Genus Amphipeplea Nilsson, 1823 accepted as Myxas G. B. Sowerby I, 1822
- Genus Auriculariana Servain, 1882 accepted as Radix Montfort, 1810
- Genus Boskovicia Brusina, 1884 † (4)
- Genus Cerasina Kobelt, 1881 accepted as Radix Montfort, 1810
- Genus Corymbina Bukowski, 1892 † (6)
- Genus Cyclolimnaea Dall, 1905 accepted as Myxas G. B. Sowerby I, 1822
- Genus Glacilimnea Iredale, 1943 accepted as Austropeplea Cotton, 1942
- Genus Gulnaria W. Turton, 1831 accepted as Radix Montfort, 1810
- Genus Kutikina Ponder & Waterhouse, 1997 accepted as Austropeplea (Kutikina) Ponder & Waterhouse, 1997
- Genus Limnovata Chiamenti, 1899
- Genus Lytostoma Brusina, 1884 † accepted as Radix (Lytostoma) Brusina, 1884 †
- Genus Neristoma H. Adams & A. Adams, 1855 accepted as Neritostoma H. Adams & A. Adams, 1855
- Genus Neritostoma H. Adams & A. Adams, 1855 accepted as Radix Montfort, 1810
- Genus Omia Annandale & Prashad, 1919 accepted as Radix Montfort, 1810
- Genus Pacifimyxas Kruglov & Starobogatov, 1985 accepted as Kamtschaticana Kruglov & Starobogatov, 1984
- Genus Simlimnea Iredale, 1943 accepted as Austropeplea Cotton, 1942
- Genus Undulotheca Gorjanović-Kramberger, 1923 † (5)
- Genus Velutinopsis F. Sandberger, 1875 † (5)
- Species Velutinopsis amplecta (Gorjanović-Kramberger, 1901) † accepted as Hiscerus amplectus (Gorjanović-Kramberger, 1901) †
- Species Velutinopsis codapavonis Marinescu, 1970 †
- Species Velutinopsis halavatsi (Gorjanović-Kramberger, 1901) † accepted as Undulotheca halavatsi (Gorjanović-Kramberger, 1901) †
- Species Velutinopsis nobilis (Reuss, 1868) † accepted as Undulotheca nobilis (Reuss, 1868) †
- Species Velutinopsis pancici (Brusina, 1893) † accepted as Undulotheca nobilis (Reuss, 1868) †
- Species Velutinopsis rugosa (Gorjanović-Kramberger, 1901) †
- Species Velutinopsis simplex (Gorjanović-Kramberger, 1899) † accepted as Radix simplex (Gorjanović-Kramberger, 1899) †
- Species Velutinopsis spiralis W. Yü, 1982 †
- Species Velutinopsis transiens Moos, 1944 †
- Species Velutinopsis undulata (Gorjanović-Kramberger, 1901) † accepted as Hiscerus undulatus (Gorjanović-Kramberger, 1901) †
- Species Velutinopsis velutina (Deshayes, 1838) †
- Genus Viridigalba Kruglov & Starobogatov, 1985 accepted as Orientogalba Kruglov & Starobogatov, 1985
- Subfamily Lancinae Hannibal, 1914 accepted as Lancini Hannibal, 1914
- Subfamily Lymnaeinae Rafinesque, 1815 (315)
- 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 (1 044)
- 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 (1 039)
- 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 (109)
- Infraclass Opisthobranchia
- Infraclass Pulmonata
- Subclass Neomphaliones accepted as Vetigastropoda
- Subclass Neritimorpha (1 916)
- Subclass Orthogastropoda represented as Gastropoda
- Subclass Patellogastropoda (514)
- Subclass Prosobranchia
- Subclass Psilogastropoda represented as Gastropoda
- Subclass Vetigastropoda (6 789)
- 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 (1 381)
- Class Polyplaxiphora accepted as Polyplacophora
- Class Rostroconchia † (64)
- Class Scaphopoda (753)
- Class Solenoconchia accepted as Scaphopoda
- Class Solenogastres (313)
- Subclass Chaetodermomorpha accepted as Caudofoveata