Between brackets is the number of accepted species

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- Mollusca (132 738)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (24 984)
- Class Caudofoveata (143)
- Class Cephalopoda (1 830)
- Class Conchifera accepted as Bivalvia
- Class Cricoconarida † (1)
- Class Gastropoda (102 673)
- Subclass Amphigastropoda † (387)
- Subclass Angiogastropoda represented as Gastropoda
- Subclass Apogastropoda
- Subclass Caenogastropoda (53 618)
- Subclass Gastropoda incertae sedis (308)
- Subclass Heterobranchia (39 153)
- Infraclass "Lower Heterobranchia" (1 137)
- Infraclass Euthyneura (37 430)
- Subterclass Acteonimorpha (411)
- Subterclass Ringipleura (2 917)
- Subterclass Tectipleura (34 102)
- Superorder Acochlidiimorpha (48)
- Superorder Ascoglossa accepted as Sacoglossa
- Superorder Basommatophora accepted as Hygrophila
- Superorder Eupulmonata (25 566)
- 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)
- Subfamily Aplexinae Starobogatov, 1967 (73)
- Subfamily Physinae Fitzinger, 1833 (130)
- Genus Archiphysa D. W. Taylor, 2003 accepted as Physella Haldeman, 1842
- Genus Beringophysa Starobogatov & Budnikova, 1976 (1)
- Genus Chiapaphysa D. W. Taylor, 2003 (2)
- Genus Costatella Dall, 1870 accepted as Physella (Costatella) Dall, 1870
- Genus Haitia Clench & Aguayo, 1932 accepted as Physella (Acutiana) Fagot, 1883
- Genus Laurentiphysa D. W. Taylor, 2003 accepted as Physa Draparnaud, 1801
- Genus Physa Draparnaud, 1801 (87)
- Genus Physella Haldeman, 1842 (36)
- Genus Rivicola Fitzinger, 1833 accepted as Physa Draparnaud, 1801
- Genus Stenophysa E. von Martens, 1898 (3)
- Genus Ultraphysella D. W. Taylor, 2003 (1)
- Genus Utahphysa D. W. Taylor, 2003 accepted as Physella Haldeman, 1842
- Genus Berellaia de Laubrière & Carez, 1881 † (5)
- Genus Hannibalina G. D. Hanna & Gester, 1963 † (1)
- Genus Petrophysa Pilsbry, 1926 accepted as Physella Haldeman, 1842
- Genus Prophysa Bandel, 1991 † (1)
- 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