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)
- Subfamily Aplexinae Starobogatov, 1967 (73)
- Genus Afrophysa Starobogatov, 1967 (1)
- Genus Amecanauta D. W. Taylor, 2003 (1)
- Genus Amuraplexa Starobogatov & Prozorova, 1989 (2)
- Genus Aplecta Herrmannsen, 1846 accepted as Aplexa J. Fleming, 1820
- Genus Aplexa J. Fleming, 1820 (44)
- Subgenus Aplexa (Amuraplexa) Starobogatov & Prozorova, 1989 accepted as Amuraplexa Starobogatov & Prozorova, 1989
- Subgenus Aplexa (Paraplexa) Starobogatov, 1989 accepted as Paraplexa Starobogatov, 1989
- Subgenus Aplexa (Stenophysa) E. von Martens, 1898 accepted as Stenophysa E. von Martens, 1898
- Species Aplexa adamsiana Tapparone Canefri, 1874 accepted as Glyptophysa novahollandica (Bowdich, 1822)
- Species Aplexa amurensis Starobogatov & Prozorova, 1989 accepted as Amuraplexa amurensis (Starobogatov & Prozorova, 1989)
- Species Aplexa atava (C. A. White, 1877) †
- Species Aplexa aurantia P. P. Carpenter, 1857 accepted as Mexinauta aurantius (P. P. Carpenter, 1857)
- Species Aplexa brevispirata (Cossmann & Pissarro, 1913) † accepted as Aplexa cotiensis Pacaud, 2022 †
- Species Aplexa breviturrita Y.-T. Li, 1983 †
- Species Aplexa canculae Pacaud, 2022 †
- Species Aplexa cotiensis Pacaud, 2022 †
- Species Aplexa cylindrica Yen, 1935 † accepted as Pseudophysa cylindrica (Yen, 1935) †
- Species Aplexa delicata Y.-T. Li, 1984 †
- Species Aplexa disjuncta (C. A. White, 1879) †
- Species Aplexa dumonti (Briart & Cornet, 1887) †
- Species Aplexa fusioidea Tolstikova, 1979 †
- Species Aplexa fuxinensis X.-H. Yu, 1987 †
- Species Aplexa galloprovincialis (Matheron, 1843) †
- Species Aplexa gardanensis (Matheron, 1843) †
- Species Aplexa gigantea (Michaud, 1837) †
- Species Aplexa grabaui Yen, 1935 † accepted as Pseudophysa grabaui (Yen, 1935) †
- Species Aplexa grasseti (Matheron, 1878) †
- Species Aplexa heberti (Deshayes, 1863) †
- Species Aplexa hypnorum (Linnaeus, 1758)
- Subspecies Aplexa hypnorum normalis H. Beck, 1838 accepted as Aplexa hypnorum (Linnaeus, 1758)
- Subspecies Aplexa hypnorum pilsbryi Brooks, 1935 accepted as Sibirenauta elongata (Say, 1821)
- Subspecies Aplexa hypnorum rhenanus H. Beck, 1838 accepted as Aplexa hypnorum (Linnaeus, 1758)
- Variety Aplexa hypnorum var. minor De Malzine, 1867 accepted as Aplexa hypnorum (Linnaeus, 1758)
- Variety Aplexa hypnorum var. tryoni (Currier, 1867) accepted as Sibirenauta elongata (Say, 1821)
- Species Aplexa iota Pacaud, 2022 †
- Species Aplexa jaimei (Hermite, 1879) †
- Species Aplexa kasekikabe Isaji, 2010 †
- Species Aplexa lipasma Y.-T. Li, 1984 †
- Species Aplexa lubrica W. Yü, 1965 †
- Species Aplexa macerata L. S. Russell, 1937 †
- Species Aplexa macilenta Y.-T. Li, 1983 †
- Species Aplexa magna Y.-T. Li, 1984 †
- Species Aplexa marmorata (Guilding, 1828) accepted as Stenophysa marmorata (Guilding, 1828)
- Species Aplexa microstriata Chamberlin & E. G. Berry, 1930 accepted as Utahphysa microstriata (Chamberlin & E. G. Berry, 1930)
- Species Aplexa militaria Yen & Reeside, 1946 †
- Species Aplexa montensis (Briart & Cornet, 1887) †
- Species Aplexa morrisonana Yen & Reeside, 1946 †
- Species Aplexa morrisoni MacNeil, 1939 †
- Species Aplexa moskvichevae Starobogatov & Zatravkin, 1989 accepted as Amuraplexa amurensis (Starobogatov & Prozorova, 1989)
- Species Aplexa normalis Y.-T. Li, 1985 †
- Species Aplexa orientalis Starobogatov & Prozorova, 1989 accepted as Amuraplexa amurensis (Starobogatov & Prozorova, 1989)
- Species Aplexa oryza Pacaud, 2022 †
- Species Aplexa ovicylindrica Youluo, 1978 †
- Species Aplexa panshanensis L.-S. Huang, 1987 †
- Species Aplexa praelonga (Matheron, 1861) †
- Species Aplexa preciosa Y.-T. Li, 1984 †
- Species Aplexa primigenia (Deshayes, 1863) †
- Species Aplexa princeps (J. S. Phillips, 1846) accepted as Mexinauta princeps (J. S. Phillips, 1846)
- Species Aplexa prisca (Noulet, 1854) †
- Species Aplexa pseudogigantea (F. Sandberger, 1870) †
- Species Aplexa pulchella (A. d'Orbigny, 1850) †
- Species Aplexa raris Y.-T. Li, 1984 †
- Species Aplexa ricei L. S. Russell, 1957 †
- Species Aplexa risleius Pacaud, 2022 †
- Species Aplexa rivalis (Maton & Rackett, 1807) accepted as Physella acuta (Draparnaud, 1805)
- Species Aplexa robusta Eames, 1952 † accepted as Limacina robusta (Eames, 1952) †
- Species Aplexa rubida Tate, 1882
- Species Aplexa subelongata (Meek & Hayden, 1856) †
- Species Aplexa subhypnorum Gottschick, 1920 †
- Species Aplexa tapanensis (Crosse & P. Fischer, 1882) accepted as Mayabina tapanensis (Crosse & P. Fischer, 1882)
- Species Aplexa turrita Tate, 1881 accepted as Glyptophysa novahollandica (Bowdich, 1822)
- Species Aplexa venezuelensis (E. von Martens, 1859)
- Species Aplexa xichuanensis Y.-T. Li, 1983 †
- Species Aplexa yangxiensis Y.-T. Li, 1987 †
- Species Aplexa zhui Pacaud, 2022 †
- Genus Austrinauta D. W. Taylor, 2003 (1)
- Genus Caribnauta D. W. Taylor, 2003 (1)
- Genus Mayabina D. W. Taylor, 2003 (10)
- Genus Mexinauta D. W. Taylor, 2003 (8)
- Genus Paraplexa Starobogatov, 1989 (1)
- Genus Sibirenauta Starobogatov & Streletzkaja, 1967 (3)
- Genus Tropinauta D. W. Taylor, 2003 (1)
- Subfamily Physinae Fitzinger, 1833 (130)
- 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