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Mollusca (132 754)
Subphylum Aculifera
Subphylum Conchifera
Subphylum Placophora accepted as Polyplacophora
Superclass Aplacophora
Class Amphineura accepted as Aculifera
Class Bivalvia (24 992)
Class Caudofoveata (143)
Class Cephalopoda (1 832)
Class Conchifera accepted as Bivalvia
Class Cricoconarida † (1)
Class Gastropoda (102 679)
Subclass Amphigastropoda † (387)
Subclass Angiogastropoda represented as Gastropoda
Subclass Apogastropoda
Subclass Caenogastropoda (53 623)
Subclass Gastropoda incertae sedis (308)
Subclass Heterobranchia (39 154)
Infraclass "Lower Heterobranchia" (1 137)
Infraclass Euthyneura (37 431)
Subterclass Acteonimorpha (411)
Subterclass Ringipleura (2 917)
Subterclass Tectipleura (34 103)
Superorder Acochlidiimorpha (48)
Superorder Ascoglossa accepted as Sacoglossa
Superorder Basommatophora accepted as Hygrophila
Superorder Eupulmonata (25 567)
Superorder Hygrophila (2 005)
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)
Superfamily Bulloidea Gray, 1827 (262)
Superfamily Cylichnoidea H. Adams & A. Adams, 1854 (215)
Family Amphisphyridae J. E. Gray, 1857 accepted as Diaphanidae Odhner, 1914 (1857)
Family Colinatydidae Oskars, Bouchet & Malaquias, 2015 (1)
Family Cylichnidae H. Adams & A. Adams, 1854 (171)
Subfamily Semiretusinae Chaban, 2016 represented as Cylichnidae H. Adams & A. Adams, 1854
Subfamily Toledoniinae Warén, 1989 represented as Cylichnidae H. Adams & A. Adams, 1854
Genus Bogasonia Warén, 1989 (3)
Genus Bullinella R. B. Newton, 1891 accepted as Cylichna Lovén, 1846
Genus Cychlinella [sic] accepted as Cylichnella Gabb, 1873
Genus Cylichlinella [sic] accepted as Cylichnella Gabb, 1873
Genus Cylichna Lovén, 1846 (108)
Genus Cylichnania Marwick, 1931 † (8)
Genus Cylichnella Gabb, 1873 (13)
Genus Cylindrella Swainson, 1840 accepted as Cylichna Lovén, 1846
Genus Decorifer Iredale, 1937 (3)
Genus Eocylichna Kuroda & Habe, 1952 accepted as Cylichna Lovén, 1846 (2)
Genus Mamillocylichna F. Nordsieck, 1972 (2)
Species Mamillocylichna abyssicola Bouchet, 1975
Species Mamillocylichna richardi (Dautzenberg, 1889)
Genus Odostomiopsis Thiele, 1904 accepted as Toledonia Dall, 1902
Genus Ohlinia Strebel, 1905 accepted as Toledonia Dall, 1902
Genus Paracteocina Minichev, 1966 (1)
Genus Ptisanula Odhner, 1913 accepted as Toledonia Dall, 1902
Genus Semiretusa Thiele, 1925 (4)
Genus Sphaerocylichna Thiele, 1925 (2)
Genus Toledonia Dall, 1902 (20)
Genus Truncacteocina Kuroda & T. Habe, 1955 (5)
Family Diaphanidae Odhner, 1914 (1857) (25)
Family Eoscaphandridae Chaban & Kijashko, 2016 (7)
Family Mnestiidae Oskars, Bouchet & Malaquias, 2015 (10)
Family Notodiaphanidae Thiele, 1931 (1)
Superfamily Diaphanoidea Odhner, 1914 (1857) accepted as Cylichnoidea H. Adams & A. Adams, 1854
Superfamily Haminoeoidea Pilsbry, 1895 (143)
Superfamily Newnesioidea Moles, Wägele, Schrödl & C. Ávila, 2017 (3)
Superfamily Philinoidea J. E. Gray, 1850 (1815) (395)
Family Cephalaspidea incertae sedis (16)
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