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Mollusca (132 888)
Subphylum Aculifera
Subphylum Conchifera
Subphylum Placophora accepted as Polyplacophora
Superclass Aplacophora
Class Amphineura accepted as Aculifera
Class Bivalvia (25 022)
Class Caudofoveata (143)
Class Cephalopoda (1 838)
Class Conchifera accepted as Bivalvia
Class Cricoconarida † (1)
Class Gastropoda (102 777)
Subclass Amphigastropoda † (396)
Subclass Angiogastropoda represented as Gastropoda
Subclass Apogastropoda
Subclass Caenogastropoda (53 684)
Subclass Gastropoda incertae sedis (309)
Subclass Heterobranchia (39 180)
Infraclass "Lower Heterobranchia" (1 137)
Infraclass Euthyneura (37 457)
Subterclass Acteonimorpha (411)
Subterclass Ringipleura (2 917)
Subterclass Tectipleura (34 129)
Superorder Acochlidiimorpha (48)
Superorder Ascoglossa accepted as Sacoglossa
Superorder Basommatophora accepted as Hygrophila
Superorder Eupulmonata (25 591)
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)
Tribe Ancylini Rafinesque, 1815 (99)
Tribe Laevapicini Hannibal, 1912 (33)
Genus Anancylus Gutiérrez Gregoric, 2012 accepted as Sineancylus Gutiérrez Gregoric, 2014
Genus Anisancylus Pilsbry, 1924 (3)
Species Anisancylus crequii (Bavay, 1904) accepted as Uncancylus crequii (Bavay, 1904)
Species Anisancylus dutrae (S. B. Santos, 1994)
Species Anisancylus gayanus (A. d'Orbigny, 1837) accepted as Anisancylus obliquus (Broderip, 1833)
Species Anisancylus lagunarum F. Haas, 1955
Species Anisancylus obliquus (Broderip, 1833)
Subspecies Anisancylus obliquus gayanus (A. d'Orbigny, 1837) accepted as Anisancylus obliquus (Broderip, 1833)
Subspecies Anisancylus obliquus maximus (Biese, 1948) accepted as Anisancylus obliquus (Broderip, 1833)
Subspecies Anisancylus obliquus rudolfi (Biese, 1948)
Genus Gundlachia L. Pfeiffer, 1849 (11)
Genus Haldemania Clessin, 1880 accepted as Laevapex B. Walker, 1903
Genus Hebetancylus Pilsbry, 1914 (6)
Genus Laevapex B. Walker, 1903 (6)
Genus Sineancylus Gutiérrez Gregoric, 2014 (1)
Genus Uncancylus Pilsbry, 1914 (6)
Genus Acrochasma Reuss, 1861
Genus Ancylina Bandel & F. Riedel, 1994 † (1)
Genus Forsancylus Iredale, 1944 accepted as Pettancylus Iredale, 1943
Genus Palaeancylus Yen, 1948 † (8)
Genus Palaeoancylus [sic] † accepted as Palaeancylus Yen, 1948 †
Subfamily Miratestinae P. Sarasin & F. Sarasin, 1897 (58)
Subfamily Planorbidae incertae sedis (57)
Subfamily Planorbinae Rafinesque, 1815 (785)
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 (1 036)
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 (6 783)
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