Between brackets is the number of accepted species

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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)
- Order Aillyida accepted as Achatinina
- Order Ellobiida (579)
- Order Gymnomorpha accepted as Systellommatophora
- Order Stylommatophora (24 764)
- Suborder Achatinina (2 899)
- Suborder Elasmognatha accepted as Succineoidei
- Suborder Helicina (21 625)
- 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)
- Subfamily Clausiliinae J. E. Gray, 1855 (288)
- Tribe Acrotomini H. Nordsieck, 1979 (54)
- Tribe Baleini A. J. Wagner, 1913 (85)
- Genus Alinda H. Adams & A. Adams, 1855 (6)
- Genus Balea J. E. Gray, 1824 (15)
- Genus Balia Bourguignat, 1858 accepted as Balea J. E. Gray, 1824
- Genus Banatica O. Boettger, 1877 accepted as Alinda (Pseudalinda) O. Boettger, 1877
- Genus Bulgarica O. Boettger, 1877 (13)
- Genus Denticularia Lindholm, 1924 accepted as Strigillaria (Bulgarica) O. Boettger, 1877
- Genus Idylopsina Lindholm, 1924 accepted as Strigillaria (Bulgarica) O. Boettger, 1877
- Genus Iphigena [sic] accepted as Alinda H. Adams & A. Adams, 1855
- Genus Iphigenia J. E. Gray, 1840 accepted as Alinda H. Adams & A. Adams, 1855
- Genus Kuzmicia Brusina, 1870 accepted as Alinda H. Adams & A. Adams, 1855
- Genus Laciniaria W. Hartmann, 1842 (4)
- Genus Likharevia H. Nordsieck, 1975 (3)
- Genus Mentissa H. Adams & A. Adams, 1855 (3)
- Genus Mentissella H. Nordsieck, 1973 (1)
- Genus Micropontica O. Boettger, 1881 (7)
- Genus Mucronaria O. Boettger, 1877 (6)
- Genus Multiplicaria Lindholm, 1924 accepted as Mucronaria (Multiplicaria) Lindholm, 1924
- Genus Pavlovicia H. Nordsieck, 1973 (3)
- Genus Plicaphora W. Hartmann, 1841 accepted as Alinda H. Adams & A. Adams, 1855
- Genus Polyptychia O. Boettger, 1877 accepted as Mucronaria O. Boettger, 1877
- Genus Pseudalinda O. Boettger, 1877 (7)
- Genus Pseudocerva Schaufuss, 1869 accepted as Alinda H. Adams & A. Adams, 1855
- Genus Quadriplicata O. Boettger, 1878 (8)
- Genus Strigilecula Kennard & B. B. Woodward, 1923 accepted as Strigillaria Vest, 1867
- Genus Strigillaria Vest, 1867 (4)
- Genus Tristania O. Boettger, 1878 accepted as Balea J. E. Gray, 1824
- Genus Uncinaria Vest, 1867 accepted as Vestia P. Hesse, 1916
- Genus Vestia P. Hesse, 1916 (5)
- Subgenus Vestia (Brabenecia) H. Nordsieck, 1974 represented as Vestia P. Hesse, 1916
- Subgenus Vestia (Pavlovicia) H. Nordsieck, 1973 represented as Vestia P. Hesse, 1916
- Subgenus Vestia (Vestia) P. Hesse, 1916 represented as Vestia P. Hesse, 1916
- Subgenus Vestia (Vestiella) H. Nordsieck, 1977 represented as Vestia P. Hesse, 1916
- Species Vestia elata (Rossmässler, 1836)
- Species Vestia gulo (E. A. Bielz, 1859)
- Species Vestia pavlovici (H. Nordsieck, 1972)
- Species Vestia ranojevici (Pavlović, 1912)
- Species Vestia roschitzi (Brancsik, 1890) accepted as Pavlovicia roschitzi (Brancsik, 1890)
- Species Vestia turgida (Rossmässler, 1836)
- Subspecies Vestia turgida abdita (M. Kimakowicz, 1883)
- Subspecies Vestia turgida procera (E. A. Bielz, 1853)
- Subspecies Vestia turgida turgida (Rossmässler, 1836)
- Tribe Boettgeriini H. Nordsieck, 1979 (21)
- Tribe Clausiliini J. E. Gray, 1855 (68)
- Tribe Emarginariini H. Nordsieck, 2007 † (2)
- Tribe Euxinellini Neubert, 2002 (3)
- Tribe Filosini H. Nordsieck, 1979 (6)
- Tribe Graciliariini H. Nordsieck, 1979 (1)
- Tribe Mentissoideini Lindholm, 1924 (34)
- Tribe Olympicolini Neubert, 2002 (1)
- Tribe Strigileuxinini H. Nordsieck, 1994 (10)
- Tribe Strumosini H. Nordsieck, 1994 (2)
- Genus Scrobiferoides Neubert, 1996 † (1)
- 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 (5 690)
- Infraorder Limacoidei (4 250)
- Infraorder Oleacinoidei (497)
- Infraorder Orthalicoidei (1 578)
- 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 (1 034)
- 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