Between brackets is the number of accepted species

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- Mollusca (132 848)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (25 011)
- Class Caudofoveata (143)
- Class Cephalopoda (1 834)
- Class Conchifera accepted as Bivalvia
- Class Cricoconarida † (1)
- Class Gastropoda (102 752)
- Subclass Amphigastropoda † (396)
- Subclass Angiogastropoda represented as Gastropoda
- Subclass Apogastropoda
- Subclass Caenogastropoda (53 669)
- 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)
- Tribe Neniini Wenz, 1923 (14)
- Genus Gonionenia Pilsbry, 1926 (2)
- Genus Nenia H. Adams & A. Adams, 1855 (1)
- Subgenus Nenia (Andinia) Poliński, 1922 accepted as Andinia Poliński, 1922
- Subgenus Nenia (Columbinia) Poliński, 1924 accepted as Columbinia Poliński, 1924
- Subgenus Nenia (Cylindronenia) Ehrmann, 1949 accepted as Cylindronenia Ehrmann, 1949
- Subgenus Nenia (Gonionenia) Pilsbry, 1926 accepted as Gonionenia Pilsbry, 1926
- Subgenus Nenia (Gracilinenia) Poliński, 1922 accepted as Gracilinenia Poliński, 1922
- Subgenus Nenia (Hemicena) Pilsbry, 1949 accepted as Hemicena Pilsbry, 1949
- Subgenus Nenia (Incaglaia) Pilsbry, 1949 accepted as Incaglaia Pilsbry, 1949
- Subgenus Nenia (Nenia) H. Adams & A. Adams, 1855 represented as Nenia H. Adams & A. Adams, 1855
- Subgenus Nenia (Neniastrum) Bourguignat, 1876 accepted as Nenia H. Adams & A. Adams, 1855
- Subgenus Nenia (Neniatracta) Pilsbry, 1926 accepted as Neniatracta Pilsbry, 1926
- Subgenus Nenia (Neniops) Pilsbry, 1926 accepted as Neniops Pilsbry, 1926
- Subgenus Nenia (Nenisca) Rehder, 1939 accepted as Nenisca Rehder, 1939
- Subgenus Nenia (Paranenia) Rehder, 1939 accepted as Paranenia Rehder, 1939
- Subgenus Nenia (Steatonenia) Pilsbry, 1926 accepted as Columbinia (Steatonenia) Pilsbry, 1926
- Subgenus Nenia (Steeriana) Jousseaume, 1900 accepted as Steeriana Jousseaume, 1900
- Species Nenia acobambensis Pilsbry, 1845
- Species Nenia angrandi (Morelet, 1863) accepted as Incaglaia (Incaglaia) angrandi (Morelet, 1863)
- Species Nenia anoecia Ehrmann, 1949 accepted as Incania anoecia (Ehrmann, 1949)
- Species Nenia archidona Jousseaume, 1900 accepted as Neniops archidona (Jousseaume, 1900)
- Species Nenia argentina Hylton Scott, 1954 accepted as Incaglaia argentina (Hylton Scott, 1954)
- Species Nenia auriculina Jousseaume, 1900 accepted as Incania auriculina (Jousseaume, 1900)
- Species Nenia belahubbardi Pilsbry, 1922 accepted as Neniatracta belahubbardi (Pilsbry, 1922)
- Species Nenia bequaerti Arias, 1953 accepted as Neniops bequaerti (Arias, 1953)
- Species Nenia blandiana (L. Pfeiffer, 1856) accepted as Columbinia blandiana (L. Pfeiffer, 1856)
- Species Nenia bryantwalkeri Pilsbry, 1922 accepted as Columbinia bryantwalkeri (Pilsbry, 1922)
- Species Nenia callangana Ehrmann, 1905 accepted as Columbinia callangana (Ehrmann, 1905)
- Species Nenia callistoglypta Pilsbry, 1949 accepted as Incaglaia adusta callistoglypta (Pilsbry, 1949)
- Species Nenia canescens Poliński, 1922 accepted as Cylindronenia canescens (Poliński, 1922)
- Species Nenia cocaensis Jousseaume, 1900 accepted as Columbinia cocaensis (Jousseaume, 1900)
- Species Nenia columbiana Poliński, 1924 accepted as Columbinia columbiana (Poliński, 1924)
- Species Nenia cooki Pilsbry, 1919 accepted as Columbinia (Steatonenia) cooki (Pilsbry, 1919)
- Species Nenia cousini Jousseaume, 1900 accepted as Columbinia cousini (Jousseaume, 1900)
- Species Nenia eka Pilsbry, 1945 accepted as Parabalea eka (Pilsbry, 1945)
- Species Nenia eugeniae Poliński, 1922 accepted as Gracilinenia eugeniae (Poliński, 1922)
- Species Nenia femurina Jousseaume, 1900 accepted as Columbinia perezi (Jousseaume, 1887)
- Species Nenia flachi O. Boettger, 1889 accepted as Peruinia peruana flachi (O. Boettger, 1889)
- Species Nenia geayi Jousseaume, 1900 accepted as Neniops geayi (Jousseaume, 1900)
- Species Nenia horrida Mabille, 1887 accepted as Grandinenia ardouiniana (Heude, 1885)
- Species Nenia huancabambensis Rolle, 1904 accepted as Columbinia huancabambensis (Rolle, 1904)
- Species Nenia jelskii Poliński, 1922 accepted as Incania jelskii (Poliński, 1922)
- Species Nenia juninensis M. Smith, 1943 accepted as Columbinia juninensis (M. Smith, 1943)
- Species Nenia lubomirskii Poliński, 1922
- Species Nenia maranhonensis (Albers, 1854) accepted as Cylindronenia maranhonensis (Albers, 1854)
- Species Nenia marshalli Pilsbry, 1926 accepted as Columbinia marshalli (Pilsbry, 1926)
- Species Nenia minuscula Pilsbry, 1945 accepted as Parabalea eka (Pilsbry, 1945)
- Species Nenia orbignyi Ancey, 1892 accepted as Columbinia orbignyi (Ancey, 1892)
- Species Nenia orientalis Mabille, 1887 accepted as Tropidauchenia orientalis (Mabille, 1887)
- Species Nenia pampasensis (Pilsbry, 1910) accepted as Incaglaia pampasensis (Pilsbry, 1910)
- Species Nenia parcecostata Poliński, 1922 accepted as Temesa parcecostata (Poliński, 1922)
- Species Nenia perezi Jousseaume, 1887 accepted as Columbinia perezi (Jousseaume, 1887)
- Species Nenia pusilla Poliński, 1922 accepted as Temesa pusilla (Polinski, 1921)
- Species Nenia quadrata (O. Boettger, 1880) accepted as Ehrmanniella quadrata (O. Boettger, 1880)
- Species Nenia raimondii (R. A. Philippi, 1867) accepted as Incaglaia raimondii (R. A. Philippi, 1867)
- Species Nenia reyrei Jousseaume, 1887 accepted as Columbinia reyrei (Jousseaume, 1887)
- Species Nenia rochebrunii Jousseaume, 1900 accepted as Gonionenia rochebrunii (Jousseaume, 1900)
- Species Nenia smithiae Pilsbry, 1901 accepted as Neniops smithiae (Pilsbry, 1901)
- Species Nenia Steatonenia Pilsbry, 1926 accepted as Columbinia (Steatonenia) Pilsbry, 1926
- Species Nenia stylina Ancey, 1887 accepted as Columbinia stylina (Ancey, 1887)
- Species Nenia subarcuata Bofill, 1897 accepted as Bofilliella subarcuata (Bofill, 1897)
- Species Nenia sublutea O. Boettger, 1909 accepted as Columbinia sublutea (O. Boettger, 1909)
- Species Nenia sztolcmani Poliński, 1922 accepted as Andiniella sztolcmani (Poliński, 1922)
- Species Nenia tridens (Schweigger, 1820)
- Species Nenia versicolor Jousseaume, 1900 accepted as Incaglaia raimondii versicolor (Jousseaume, 1900)
- Species Nenia wagneri Polinski, 1921 accepted as Andiniella wagneri (Polinski, 1921)
- Species Nenia warszewiczi Poliński, 1924 accepted as Incania warszewiczi (Poliński, 1924)
- Species Nenia weyrauchi Pilsbry, 1945 accepted as Incaglaia angrandi weyrauchi (Pilsbry, 1945)
- Genus Neniops Pilsbry, 1926 (8)
- Genus Nenisca Rehder, 1939 (2)
- Genus Paranenia Rehder, 1939 (1)
- 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 (1 581)
- 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