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Mollusca (133 260)
Subphylum Aculifera
Subphylum Conchifera
Subphylum Placophora accepted as Polyplacophora
Superclass Aplacophora
Class Amphineura accepted as Aculifera
Class Bivalvia (25 078)
Class Caudofoveata (143)
Class Cephalopoda (1 917)
Class Conchifera accepted as Bivalvia
Class Cricoconarida † (1)
Class Gastropoda (103 009)
Subclass Amphigastropoda † (434)
Subclass Angiogastropoda represented as Gastropoda
Subclass Apogastropoda
Subclass Caenogastropoda (53 818)
Subclass Gastropoda incertae sedis (313)
Subclass Heterobranchia (39 225)
Infraclass "Lower Heterobranchia" (1 140)
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)
Family Physidae Fitzinger, 1833 (210)
Family Planorbidae Rafinesque, 1815 (1 044)
Subfamily Ancylinae Rafinesque, 1815 (141)
Subfamily Miratestinae P. Sarasin & F. Sarasin, 1897 (59)
Subfamily Planorbidae incertae sedis (57)
Subfamily Planorbinae Rafinesque, 1815 (786)
Tribe Camptoceratini Dall, 1870 (8)
Tribe Coretini J. E. Gray, 1847 (48)
Tribe Drepanotrematini Zilch, 1959 (12)
Tribe Helisomatini F. C. Baker, 1928 (188)
Genus Acrorbis Odhner, 1937 (1)
Genus Afroplanorbis Thiele, 1931 accepted as Biomphalaria Preston, 1910
Genus Armigerus Clessin, 1886 accepted as Biomphalaria Preston, 1910
Genus Australorbis Pilsbry, 1934 accepted as Biomphalaria Preston, 1910 (6)
Genus Biomphalaria Preston, 1910 (84)
Genus Carinifex W. G. Binney, 1864 accepted as Helisoma Swainson, 1840
Genus Dilatata Clessin, 1884 (3)
Genus Discus Haldeman, 1840 accepted as Planorbula Haldeman, 1840
Genus Helisoma Swainson, 1840 (20)
Genus Heterodiscus Westerlund, 1903 accepted as Biomphalaria Preston, 1910
Genus Lateorbis F. C. Baker, 1945 accepted as Biomphalaria Preston, 1910
Genus Menetus H. Adams & A. Adams, 1855 (14)
Genus Micromenetus F. C. Baker, 1945 accepted as Dilatata Clessin, 1884
Genus Obstructio F. Haas, 1939 accepted as Biomphalaria Preston, 1910
Genus Parapholyx G. D. Hanna, 1922 accepted as Vorticifex (Parapholyx) G. D. Hanna, 1922
Genus Pecosorbis D. W. Taylor, 1985 (1)
Genus Planorbella Haldeman, 1843 (35)
Genus Planorbina Haldeman, 1843 accepted as Biomphalaria Preston, 1910
Genus Planorbula Haldeman, 1840 (6)
Genus Platytaphius Pilsbry, 1924 accepted as Biomphalaria Preston, 1910
Genus Pompholycodea Lindholm, 1927 accepted as Parapholyx G. D. Hanna, 1922
Genus Pompholyx I. Lea, 1856 accepted as Parapholyx G. D. Hanna, 1922
Genus Promenetus F. C. Baker, 1935 (2)
Genus Seminolina Pilsbry, 1934 accepted as Planorbella Haldeman, 1843
Genus Syrioplanorbis F. C. Baker, 1945 accepted as Biomphalaria Preston, 1910
Species Syrioplanorbis hardmani (Wade, 1924) † accepted as Biomphalaria hardmani (Wade, 1924) †
Genus Taphius H. Adams & A. Adams, 1855 accepted as Biomphalaria Preston, 1910
Genus Tropicorbis A. P. Brown & Pilsbry, 1914 accepted as Biomphalaria Preston, 1910
Genus Vorticifex Meek, 1870 (16)
Tribe Neoplanorbini Hannibal, 1912 (7)
Tribe Planorbini Rafinesque, 1815 (446)
Tribe Segmentinini F. C. Baker, 1945 (77)
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 (1 039)
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