Between brackets is the number of accepted species

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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)
- Order Aillyida accepted as Achatinina
- Order Ellobiida (579)
- Order Gymnomorpha accepted as Systellommatophora
- Order Stylommatophora (24 788)
- Suborder Achatinina (2 912)
- Suborder Elasmognatha accepted as Succineoidei
- Suborder Helicina (21 636)
- Infraorder Arionoidei (140)
- Infraorder Clausilioidei (1 859)
- Superfamily Clausilioidea J. E. Gray, 1855 (1 859)
- Family Clausiliidae J. E. Gray, 1855 (1 762)
- Subfamily Alopiinae A. J. Wagner, 1913 (434)
- Tribe Alopiini A. J. Wagner, 1913 (103)
- Tribe Cochlodinini Lindholm, 1925 (1923) (42)
- Tribe Delimini R. Brandt, 1956 (62)
- Tribe Medorini H. Nordsieck, 1997 (227)
- Genus Agathylla H. Adams & A. Adams, 1855 (12)
- Genus Albinaria Vest, 1867 (122)
- Genus Angiticosta H. Nordsieck, 1977 accepted as Carinigera Möllendorff, 1873
- Genus Bathyclista O. Boettger, 1885 accepted as Isabellaria Vest, 1867
- Genus Callopleura Pallary, 1939 accepted as Cristataria Vest, 1867
- Genus Carinigera Möllendorff, 1873 (20)
- Genus Cathariella Lindholm, 1925 accepted as Albinaria (Cathariella) Lindholm, 1925
- Genus Charites Westerlund, 1901 accepted as Isabellaria Vest, 1867
- Genus Clausilina Ehrenberg, 1831 accepted as Cristataria Vest, 1867
- Genus Cristaria Westerlund, 1884 accepted as Cristataria Vest, 1867
- Genus Cristataria Vest, 1867 (29)
- Genus Graeca O. Boettger, 1877 accepted as Albinaria (Graeca) O. Boettger, 1877
- Genus Inchoatia E. Gittenberger & Uit de Weerd, 2006 (3)
- Genus Interstriata O. Boettger, 1878 accepted as Albinaria (Mirabellina) O. Boettger, 1878
- Genus Isabellaria Vest, 1867 (12)
- Genus Lamellifera Monterosato, 1892 accepted as Muticaria Lindholm, 1925
- Genus Lampedusa O. Boettger, 1877 (3)
- Subgenus Lampedusa (Imitatrix) Westerlund, 1884 represented as Lampedusa O. Boettger, 1877
- Subgenus Lampedusa (Lampedusa) O. Boettger, 1877 represented as Lampedusa O. Boettger, 1877
- Species Lampedusa (Lampedusa) lopadusae (Calcara, 1846) represented as Lampedusa lopadusae (Calcara, 1846)
- Subspecies Lampedusa (Lampedusa) lopadusae lopadusae (Calcara, 1846) represented as Lampedusa lopadusae lopadusae (Calcara, 1846)
- Subspecies Lampedusa (Lampedusa) lopadusae nodulosa (Monterosato, 1892) represented as Lampedusa lopadusae nodulosa (Monterosato, 1892)
- Species Lampedusa imitatrix (O. Boettger, 1879)
- Species Lampedusa lopadusae (Calcara, 1846)
- Species Lampedusa melitensis (Caruana Gatto, 1892)
- Genus Leucostigma A. J. Wagner, 1919 (1)
- Genus Lopadusaria Monterosato, 1892 accepted as Lampedusa O. Boettger, 1877
- Genus Medora H. Adams & A. Adams, 1855 (17)
- Genus Medorella B. B. Woodward, 1924 accepted as Medora H. Adams & A. Adams, 1855
- Genus Mundaria Lindholm, 1924 accepted as Albinaria (Cathariella) Lindholm, 1925
- Genus Muticaria Lindholm, 1925 (5)
- Genus Naevosa O. Boettger, 1878 accepted as Albinaria (Graja) O. Boettger, 1878
- Genus Olympicosta H. Nordsieck, 1972 accepted as Carinigera Möllendorff, 1873
- Genus Pistillum O. Boettger, 1892 accepted as Albinaria (Laconica) O. Boettger, 1878
- Genus Priodelima A. J. Wagner, 1924 accepted as Albinaria (Cretica) O. Boettger, 1878
- Genus Protalbinaria A. J. Wagner, 1923 accepted as Isabellaria Vest, 1867
- Genus Sericata O. Boettger, 1878 accepted as Isabellaria Vest, 1867
- Genus Strigilodelima A. J. Wagner, 1924 (2)
- Genus Vallatia E. Gittenberger & Uit de Weerd, 2006 (1)
- Genus Venusta O. Boettger, 1877 accepted as Isabellaria Vest, 1867
- Subfamily Clausiliinae J. E. Gray, 1855 (288)
- Subfamily Cochlodininae Lindholm, 1925 accepted as Cochlodinini Lindholm, 1925 (1923)
- Subfamily Constrictinae H. Nordsieck, 1981 † (7)
- Subfamily Eualopiinae H. Nordsieck, 1978 † (30)
- Subfamily Euxininae I. M. Likharev, 1962 accepted as Clausiliinae J. E. Gray, 1855
- Subfamily Garnieriinae C. R. Boettger, 1926 (61)
- Subfamily Laminiferinae Wenz, 1923 (24)
- Subfamily Mentissoideinae Lindholm, 1924 accepted as Mentissoideini Lindholm, 1924
- Subfamily Neniinae Wenz, 1923 (14)
- Subfamily Peruiniinae H. Nordsieck, 2005 (144)
- Subfamily Phaedusinae A. J. Wagner, 1922 (758)
- Subfamily Serrulininae Ehrmann, 1927 accepted as Serrulinini Ehrmann, 1927
- Subfamily Synprosphyminae H. Nordsieck, 2007 accepted as Phaedusinae A. J. Wagner, 1922
- Genus Cirrobasis Conrad, 1874 † (1)
- Genus Dactylius F. Sandberger, 1872 † accepted as Filholia Bourguignat, 1877 †
- Genus Dactylomorpha Gude, 1911 † accepted as Filholia Bourguignat, 1877 †
- Genus Dextroformosana O. Boettger & Schmacker, 1894 accepted as Formosana O. Boettger, 1877
- Genus Dextrospira Hrubesch, 1965 † (1)
- Genus Distortiphaedusa Grego & Szekeres, 2011 accepted as Oospira (Distortiphaedusa) Grego & Szekeres, 2011
- Genus Pirostoma Möllendorff, 1873 accepted as Macrogastra W. Hartmann, 1841
- Family Filholiidae Wenz, 1923 † (82)
- Family Palaeostoidae H. Nordsieck, 1986 † (15)
- Infraorder Helicina incertae sedis (3 210)
- Infraorder Helicoidei (5 691)
- Infraorder Limacoidei (4 251)
- Infraorder Oleacinoidei (497)
- Infraorder Orthalicoidei (1 587)
- Infraorder Partuloinei accepted as Pupilloidei
- Infraorder Pupilloidei (3 436)
- Infraorder Rhytidoidei (581)
- Infraorder Sagdoinei accepted as Helicoidei
- Infraorder Succineoidei (384)
- Suborder Orthurethra accepted as Pupilloidei
- Suborder Scolodontina (165)
- Suborder Sigmurethra accepted as Helicina
- Suborder Stylommatophora incertae sedis (75)
- Order Systellommatophora (224)
- 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 (1 036)
- 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