Between brackets is the number of accepted species

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- Mollusca (132 851)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (25 013)
- Class Caudofoveata (143)
- Class Cephalopoda (1 834)
- Class Conchifera accepted as Bivalvia
- Class Cricoconarida † (1)
- Class Gastropoda (102 753)
- Subclass Amphigastropoda † (396)
- Subclass Angiogastropoda represented as Gastropoda
- Subclass Apogastropoda
- Subclass Caenogastropoda (53 670)
- Subclass Gastropoda incertae sedis (308)
- Subclass Heterobranchia (39 172)
- Infraclass "Lower Heterobranchia" (1 137)
- Infraclass Euthyneura (37 449)
- Subterclass Acteonimorpha (411)
- Subterclass Ringipleura (2 917)
- Subterclass Tectipleura (34 121)
- Superorder Acochlidiimorpha (48)
- Superorder Ascoglossa accepted as Sacoglossa
- Superorder Basommatophora accepted as Hygrophila
- Superorder Eupulmonata (25 585)
- Order Aillyida accepted as Achatinina
- Order Ellobiida (579)
- Order Gymnomorpha accepted as Systellommatophora
- Order Stylommatophora (24 782)
- Suborder Achatinina (2 912)
- Suborder Elasmognatha accepted as Succineoidei
- Suborder Helicina (21 630)
- 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)
- 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)
- Tribe Peruiniini H. Nordsieck, 2005 accepted as Peruiniinae H. Nordsieck, 2005
- Genus Andinia Poliński, 1922 (1)
- Genus Andiniastra H. Nordsieck, 2005 (1)
- Genus Andiniella Weyrauch, 1958 (3)
- Genus Bequaertinenia Weyrauch, 1964 (3)
- Genus Brevinenia Neubert & H. Nordsieck, 2005 (2)
- Genus Columbinia Poliński, 1924 (35)
- Genus Cyclonenia H. Nordsieck, 1999 (9)
- Genus Cylindronenia Ehrmann, 1949 (7)
- Genus Ehrmanniella Zilch, 1949 (2)
- Genus Exbalea Jousseaume, 1900 accepted as Temesa H. Adams & A. Adams, 1855
- Genus Gracilinenia Poliński, 1922 (4)
- Genus Hemicena Pilsbry, 1949 (2)
- Genus Incaglaia Pilsbry, 1949 (9)
- Subgenus Incaglaia (Gibbonenia) Zilch, 1954 represented as Incaglaia Pilsbry, 1949
- Subgenus Incaglaia (Incaglaia) Pilsbry, 1949 represented as Incaglaia Pilsbry, 1949
- Species Incaglaia (Incaglaia) adusta (O. Boettger, 1880) represented as Incaglaia adusta (O. Boettger, 1880)
- Subspecies Incaglaia (Incaglaia) adusta adusta (O. Boettger, 1880) represented as Incaglaia adusta adusta (O. Boettger, 1880)
- Subspecies Incaglaia (Incaglaia) adusta callistoglypta (Pilsbry, 1949) represented as Incaglaia adusta callistoglypta (Pilsbry, 1949)
- Subspecies Incaglaia (Incaglaia) adusta cuencaensis (Weyrauch, 1964) represented as Incaglaia adusta cuencaensis (Weyrauch, 1964)
- Subspecies Incaglaia (Incaglaia) adusta tumens (F. Haas, 1955) represented as Incaglaia adusta tumens (F. Haas, 1955)
- Species Incaglaia (Incaglaia) andecola (Morelet, 1863) represented as Incaglaia andecola (Morelet, 1863)
- Species Incaglaia (Incaglaia) angrandi (Morelet, 1863) represented as Incaglaia angrandi (Morelet, 1863)
- Species Incaglaia (Incaglaia) dextroversa (Pilsbry, 1949) represented as Incaglaia dextroversa (Pilsbry, 1949)
- Species Incaglaia (Incaglaia) huanucensis (Pilsbry, 1949) represented as Incaglaia huanucensis (Pilsbry, 1949)
- Species Incaglaia (Incaglaia) olssoni (Pilsbry, 1949) represented as Incaglaia olssoni (Pilsbry, 1949)
- Species Incaglaia (Incaglaia) pampasensis (Pilsbry, 1910) represented as Incaglaia pampasensis (Pilsbry, 1910)
- Subgenus Incaglaia (Leuconenia) H. Nordsieck, 2005 accepted as Leuconenia H. Nordsieck, 2005
- Species Incaglaia adusta (O. Boettger, 1880)
- Species Incaglaia andecola (Morelet, 1863)
- Species Incaglaia angrandi (Morelet, 1863)
- Species Incaglaia argentina (Hylton Scott, 1954)
- Species Incaglaia dextroversa (Pilsbry, 1949)
- Species Incaglaia huanucensis (Pilsbry, 1949)
- Species Incaglaia leucostoma Neubert & H. Nordsieck, 2005 accepted as Leuconenia leucostoma (Neubert & H. Nordsieck, 2005)
- Species Incaglaia olssoni (Pilsbry, 1949)
- Species Incaglaia pampasensis (Pilsbry, 1910)
- Species Incaglaia raimondii (R. A. Philippi, 1867)
- Genus Incania Poliński, 1922 (13)
- Genus Leuconenia H. Nordsieck, 2005 (1)
- Genus Miranenia Grego & Szekeres, 2004 accepted as Bequaertinenia (Miranenia) Grego & Szekeres, 2004
- Genus Neniaptyx H. Nordsieck, 2007 (1)
- Genus Neniatracta Pilsbry, 1926 (2)
- Genus Neniella Grego & Szekeres, 2004 (3)
- Genus Parabalea Ancey, 1882 (15)
- Genus Peruinia Poliński, 1922 (3)
- Genus Pfeifferiella Weyrauch, 1957 (3)
- Genus Pilsbrylia Hylton Scott, 1952 (3)
- Genus Pseudogracilinenia Loosjes & Loosjes-van Bemmel, 1984 (3)
- Genus Steatonenia Pilsbry, 1926 accepted as Columbinia (Steatonenia) Pilsbry, 1926
- Genus Steeriana Jousseaume, 1900 (5)
- Genus Symptychiella H. Nordsieck, 1999 (6)
- Genus Temesa H. Adams & A. Adams, 1855 (5)
- Genus Weyrauchiella Loosjes & Loosjes-van Bemmel, 1966 accepted as Incaglaia Pilsbry, 1949
- Genus Zilchiella Weyrauch, 1957 (3)
- 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 (1 581)
- 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