Between brackets is the number of accepted species

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- Mollusca (132 848)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (25 011)
- Class Caudofoveata (143)
- Class Cephalopoda (1 834)
- Class Conchifera accepted as Bivalvia
- Class Cricoconarida † (1)
- Class Gastropoda (102 752)
- Subclass Amphigastropoda † (396)
- Subclass Angiogastropoda represented as Gastropoda
- Subclass Apogastropoda
- Subclass Caenogastropoda (53 669)
- Subclass Gastropoda incertae sedis (308)
- Subclass Heterobranchia (39 172)
- Infraclass "Lower Heterobranchia" (1 137)
- Infraclass Euthyneura (37 449)
- Subterclass Acteonimorpha (411)
- Subterclass Ringipleura (2 917)
- Subterclass Tectipleura (34 121)
- Superorder Acochlidiimorpha (48)
- Superorder Ascoglossa accepted as Sacoglossa
- Superorder Basommatophora accepted as Hygrophila
- Superorder Eupulmonata (25 585)
- 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)
- 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 Helicorbis W. H. Benson, 1855 (10)
- Genus Hippeutis Charpentier, 1837 (26)
- Subgenus Hippeutis (Helicorbis) W. H. Benson, 1855 accepted as Helicorbis W. H. Benson, 1855
- Subgenus Hippeutis (Hippeutis) Charpentier, 1837 represented as Hippeutis Charpentier, 1837
- Subgenus Hippeutis (Menetus) H. Adams & A. Adams, 1855 accepted as Menetus H. Adams & A. Adams, 1855
- Species Hippeutis acuticarinatus (Dunker, 1853) †
- Species Hippeutis ambiguus (Deshayes, 1863) †
- Species Hippeutis applanatus X.-H. Yu, 1987 †
- Species Hippeutis badae (Bollinger, 1914)
- Species Hippeutis bajandaicus (Popova, 1981) †
- Species Hippeutis bureaui (Cossmann, 1919) †
- Species Hippeutis caenosus (W. H. Benson, 1850) accepted as Helicorbis umbilicalis (W. H. Benson, 1836)
- Species Hippeutis chertieri (Deshayes, 1863) †
- Species Hippeutis clathratus (G.-X. Zhu, 1980) †
- Species Hippeutis complanatus (Linnaeus, 1758)
- Species Hippeutis discotus G.-X. Zhu, 1980 †
- Species Hippeutis dongdausuensis [sic] † accepted as Hippeutis dongdawusuensis G.-X. Zhu, 1976 †
- Species Hippeutis dongdawusuensis G.-X. Zhu, 1976 † accepted as Helisoma dongdawusuensis (G.-X. Zhu, 1976) †
- Species Hippeutis eysdenensis (É. Vincent, 1930) †
- Species Hippeutis fasciata Gottschick, 1920 † accepted as Hippeutis fasciatus Gottschick, 1920 †
- Species Hippeutis fasciatus Gottschick, 1920 †
- Species Hippeutis headonensis (Jodot, 1942) †
- Species Hippeutis inflatus (Deshayes, 1825) †
- Species Hippeutis junodi Connolly, 1922 accepted as Lentorbis junodi (Connolly, 1922)
- Species Hippeutis langxiensis H.-Z. Pan, 1982 †
- Species Hippeutis lens (Brongniart, 1810) †
- Species Hippeutis luminosa W. Yü, 1965 †
- Species Hippeutis muzzolonicus (Oppenheim, 1895) †
- Species Hippeutis obtusus (J. Sowerby, 1816) †
- Species Hippeutis patella (F. Sandberger, 1871) †
- Species Hippeutis rouvillei (Matheron, 1868) †
- Species Hippeutis rouxi (Noulet, 1863) †
- Species Hippeutis schubarti F. Haas, 1938 accepted as Drepanotrema lucidum (L. Pfeiffer, 1839)
- Species Hippeutis sowerbyi (Bronn, 1838) †
- Species Hippeutis stossichi (Clessin, 1881)
- Species Hippeutis subfontanus (Clessin, 1877) †
- Subspecies Hippeutis subfontanus latior Gottschick, 1920 †
- Subspecies Hippeutis subfontanus subfontanus (Clessin, 1877) †
- Species Hippeutis thienemanni B. Rensch, 1934 accepted as Helicorbis thienemanni (B. Rensch, 1934)
- Species Hippeutis triangulatus X.-H. Yu, 1987 †
- Species Hippeutis umbilicalis (W. H. Benson, 1836) accepted as Helicorbis cantori (W. H. Benson, 1850)
- Species Hippeutis ungeri (Reuss, 1849) †
- Species Hippeutis vicentinus (Oppenheim, 1895) †
- Genus Hyppeutis Charpentier, 1837 accepted as Hippeutis Charpentier, 1837
- Genus Intha Annandale, 1922 (1)
- Genus Kolhymorbis Starobogatov & Streletzkaja, 1967 (4)
- Genus Lentorbis Mandahl-Barth, 1954 (3)
- Genus Pingiella F. C. Baker, 1945 accepted as Helicorbis W. H. Benson, 1855 (1)
- Genus Polypylis Pilsbry, 1906 (9)
- Genus Segmentina J. Fleming, 1818 (17)
- Genus Segmentorbis Mandahl-Barth, 1954 (4)
- Genus Segnitila Cotton & Godfrey, 1938 accepted as Helicorbis W. H. Benson, 1855
- Genus Trochorbis W. H. Benson, 1855 (2)
- 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