Between brackets is the number of accepted species
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- Mollusca (132 791)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (25 009)
- Class Caudofoveata (143)
- Class Cephalopoda (1 834)
- Class Conchifera accepted as Bivalvia
- Class Cricoconarida † (1)
- Class Gastropoda (102 697)
- Subclass Amphigastropoda † (390)
- Subclass Angiogastropoda represented as Gastropoda
- Subclass Apogastropoda
- Subclass Caenogastropoda (53 636)
- Subclass Gastropoda incertae sedis (308)
- Subclass Heterobranchia (39 156)
- Infraclass "Lower Heterobranchia" (1 137)
- Infraclass Euthyneura (37 433)
- Subterclass Acteonimorpha (411)
- Subterclass Ringipleura (2 917)
- Subterclass Tectipleura (34 105)
- Superorder Acochlidiimorpha (48)
- Superorder Ascoglossa accepted as Sacoglossa
- Superorder Basommatophora accepted as Hygrophila
- Superorder Eupulmonata (25 569)
- Order Aillyida accepted as Achatinina
- Order Ellobiida (579)
- Order Gymnomorpha accepted as Systellommatophora
- Order Stylommatophora (24 766)
- Suborder Achatinina (2 900)
- Suborder Elasmognatha accepted as Succineoidei
- Suborder Helicina (21 626)
- Infraorder Arionoidei (140)
- Infraorder Clausilioidei (1 859)
- Infraorder Helicina incertae sedis (3 210)
- Infraorder Helicoidei (5 690)
- Infraorder Limacoidei (4 251)
- Infraorder Oleacinoidei (497)
- Infraorder Orthalicoidei (1 578)
- Infraorder Partuloinei accepted as Pupilloidei
- Infraorder Pupilloidei (3 436)
- Superfamily Achatinelloidea Gulick, 1873 accepted as Pupilloidea W. Turton, 1831
- Superfamily Azecoidea H. Watson, 1920 (44)
- Superfamily Chondrinoidea Steenberg, 1925 (183)
- Superfamily Cionelloidea L. Pfeiffer, 1879 accepted as Cochlicopoidea Pilsbry, 1900 (1879)
- Superfamily Cochlicopoidea Pilsbry, 1900 (1879) accepted as Pupilloidea W. Turton, 1831
- Superfamily Dendropupoidea Wenz, 1938 † (11)
- Superfamily Enoidea B. B. Woodward, 1903 (1880) accepted as Pupilloidea W. Turton, 1831
- Superfamily Orculoidea Pilsbry, 1918 accepted as Pupilloidea W. Turton, 1831
- Superfamily Partuloidea Pilsbry, 1900 accepted as Pupilloidea W. Turton, 1831
- Superfamily Pupilloidea W. Turton, 1831 (3 198)
- Family Achatinellidae Gulick, 1873 (337)
- Family Agardhiellidae Harl & Páll-Gergely, 2017 (32)
- Family Amastridae Pilsbry, 1910 (318)
- Family Argnidae Hudec, 1965 (16)
- Family Cerastidae Wenz, 1923 (259)
- Family Cerastuidae Wenz, 1930 accepted as Cerastidae Wenz, 1923
- Family Chondrulidae A. J. Wagner, 1928 accepted as Chondrulini Wenz, 1923
- Family Cionellidae L. Pfeiffer, 1879 accepted as Cochlicopidae Pilsbry, 1900 (1879)
- Family Cochlicopidae Pilsbry, 1900 (1879) (22)
- Family Cylindrovertillidae Iredale, 1940 accepted as Nesopupinae Steenberg, 1925
- Family Draparnaudiidae Solem, 1962 (6)
- Family Elasmiatidae Kuroda & T. Habe, 1949 accepted as Elasmiatini Kuroda & T. Habe, 1949
- Family Enidae B. B. Woodward, 1903 (1880) (687)
- Subfamily Andronakiinae Schileyko, 1998 accepted as Enini B. B. Woodward, 1903 (1880)
- Subfamily Buliminusinae Kobelt, 1880 (41)
- Subfamily Chondrulopsininae Schileyko, 1978 accepted as Multidentulini Schileyko, 1978
- Subfamily Eninae B. B. Woodward, 1903 (1880) (643)
- Tribe Chondrulini Wenz, 1923 (97)
- Tribe Enini B. B. Woodward, 1903 (1880) (513)
- Genus Akramovskiella Schileyko, 1984
- Genus Amphiscopus Westerlund, 1887 (3)
- Genus Anatolya Páll-Gergely & Bank, 2016 (1)
- Genus Andronakia Lindholm, 1913 (1)
- Genus Apoecus Möllendorff, 1902 (28)
- Genus Aridenus Schileyko, 1984 accepted as Pseudonapaeus Westerlund, 1887
- Genus Boninena Habe, 1956 (4)
- Genus Bulinus S. Studer, 1820 accepted as Ena W. Turton, 1831
- Genus Chondritortus Monterosato, 1908 accepted as Jaminia Risso, 1826
- Genus Chondrulopsis Westerlund, 1887 accepted as Pseudonapaeus Westerlund, 1887
- Genus Cirna Pallary, 1928 (1)
- Genus Clausilioides Lindholm, 1925 (4)
- Genus Clausiliopsis Möllendorff, 1901 (10)
- Genus Coccoderma Möllendorff, 1901 accepted as Apoecus Möllendorff, 1902
- Genus Coniconapaeus Abbes, Nouira & Neubert, 2009 (3)
- Genus Differena Schileyko, 1984 (1)
- Genus Dolichena Pilsbry, 1934 (2)
- Genus Ena W. Turton, 1831 (12)
- Genus Geminula Lindholm, 1925 (7)
- Genus Holcauchen Möllendorff, 1901 (18)
- Species Holcauchen anceyi (Hilber, 1883)
- Species Holcauchen brookedolani (Pilsbry, 1934)
- Species Holcauchen clausiliaeformis (Möllendorff, 1901)
- Species Holcauchen compressicollis (Ancey, 1882)
- Species Holcauchen entocraspedius (Möllendorff, 1901)
- Species Holcauchen gregoriana (Annandale, 1923)
- Species Holcauchen hyacinthi (Gredler, 1898)
- Species Holcauchen kangdingensis W.-H. Zhang, D.-N. Chen & G.-Q. Zhang, 2003
- Species Holcauchen markamensis D.-N. Chen & G.-Q. Zhang, 2000
- Species Holcauchen micropeas (Möllendorff, 1901)
- Species Holcauchen multicostatus Z.-G. Chen, G.-L. Xie, P. Wang & X.-P. Wu, 2024
- Species Holcauchen nanping M. Wu & Y.-X. Fang, 2012
- Species Holcauchen nordsiecki D.-B. Wang & M. Wu, 2012
- Species Holcauchen rhabdites (Gredler, 1898)
- Species Holcauchen rhaphis (Möllendorff, 1901)
- Species Holcauchen rhusius (Möllendorff, 1901)
- Species Holcauchen strangnlatus (Möllendorff, 1901) accepted as Holcauchen strangulatus (Möllendorff, 1901)
- Species Holcauchen strangulatus (Möllendorff, 1901)
- Species Holcauchen sulcatus (Möllendorff, 1901)
- Genus Imparietinia Lindholm, 1925 (2)
- Genus Imparietula Lindholm, 1925 (6)
- Genus Jaminia Risso, 1826 (3)
- Genus Kabylia Pallary, 1928 (2)
- Genus Labroena Lindholm, 1927 accepted as Pseudonapaeus Westerlund, 1887
- Genus Laevozebrinus Lindholm, 1925 (6)
- Genus Ljudmilena Schileyko, 1984 (7)
- Genus Lophauchen Möllendorff, 1901 (1)
- Genus Luchuena T. Habe, 1956 (8)
- Genus Mastoides Westerlund, 1896 (3)
- Genus Mauronapaeus Kobelt, 1899 (3)
- Genus Megalena Hausdorf, 1999 (1)
- Genus Mirus Albers, 1850 (49)
- Genus Napaeinus P. Hesse, 1933 accepted as Napaeus Albers, 1850
- Genus Napaeopsis Sturany & A. J. Wagner, 1914 (5)
- Genus Napaeus Albers, 1850 (86)
- Genus Nepaliena Schileyko & Frank, 1994 (1)
- Genus Omphaloconus Westerlund, 1887 (1)
- Genus Ottorosenia Muratov, 1992 (1)
- Genus Petraeomastus Möllendorff, 1901 (26)
- Genus Pseudochondrula P. Hesse, 1933 (9)
- Genus Pseudojaminia Páll-Gergely & Bank, 2016 (5)
- Genus Pseudonapaeus Westerlund, 1887 (107)
- Genus Pupinidius Möllendorff, 1901 (17)
- Genus Pupopsis Gredler, 1898 (16)
- Genus Retowskia O. Boettger, 1881 (2)
- Genus Serina Gredler, 1898 (14)
- Genus Severtzovia Kobelt, 1904 accepted as Pseudonapaeus Westerlund, 1887
- Genus Sewertzowia Kobelt, 1888 accepted as Pseudonapaeus Westerlund, 1887
- Genus Siraphorus Lindholm, 1925 accepted as Pseudonapaeus Westerlund, 1887
- Genus Spaniodonta Kobelt & Möllendorff, 1902 (2)
- Genus Subzebrinus Westerlund, 1887 accepted as Pseudonapaeus Westerlund, 1887
- Genus Triangustoma Schileyko, 1984 (1)
- Genus Turanena Lindholm, 1922 (34)
- Genus Yakuena T. Habe, 1956 accepted as Luchuena T. Habe, 1956
- Tribe Multidentulini Schileyko, 1978 (33)
- Subfamily Euchondrinae Schileyko, 1998 accepted as Multidentulini Schileyko, 1978
- Subfamily Jaminiinae Thiele, 1931 accepted as Enini B. B. Woodward, 1903 (1880)
- Subfamily Merdigerinae Schileyko, 1984 accepted as Multidentulini Schileyko, 1978
- Subfamily Multidentulinae Schileyko, 1978 accepted as Multidentulini Schileyko, 1978
- Subfamily Napaeinae A. J. Wagner, 1928 accepted as Eninae B. B. Woodward, 1903 (1880)
- Subfamily Pseudonapaeinae Schileyko, 1978 accepted as Eninae B. B. Woodward, 1903 (1880)
- Subfamily Retowskiinae Schileyko, 1978 accepted as Eninae B. B. Woodward, 1903 (1880)
- Subfamily Spelaeoconchinae A. J. Wagner, 1928 accepted as Spelaeoconchidae A. J. Wagner, 1928
- Genus Palaeomastus H. Nordsieck, 2014 † (3)
- Family Fauxulidae Harl & Páll-Gergely, 2017 (21)
- Family Gastrocoptidae Pilsbry, 1918 (491)
- Family Hypselostomatidae Zilch, 1959 accepted as Hypselostomatinae Zilch, 1959
- Family Lauriidae Steenberg, 1925 (92)
- Family Odontocycladidae Hausdorf, 1996 (2)
- Family Orculidae Pilsbry, 1918 (85)
- Family Pachnodidae Steenberg, 1925 accepted as Cerastidae Wenz, 1923
- Family Pacificellidae Steenberg, 1925 accepted as Pacificellinae Steenberg, 1925
- Family Pagodulinidae Pilsbry, 1924 (12)
- Family Partulidae Pilsbry, 1900 (106)
- Family Pleurodiscidae Wenz, 1923 (11)
- Family Pupidae J. Fleming, 1822 accepted as Cerionidae Pilsbry, 1901
- Family Pupillidae W. Turton, 1831 (140)
- Family Pupisomatidae Iredale, 1940 accepted as Valloniidae E. S. Morse, 1864
- Family Pupoididae Iredale, 1939 accepted as Pupoidinae Iredale, 1939
- Family Pyramidulidae Kennard & B. B. Woodward, 1914 (19)
- Family Spelaeoconchidae A. J. Wagner, 1928 (1)
- Family Spelaeodiscidae Steenberg, 1925 (23)
- Family Strobilidae Jooss, 1911 accepted as Strobilopsidae Wenz, 1915
- Family Strobilopsidae Wenz, 1915 (85)
- Family Tornatellinidae Sykes, 1900 accepted as Tornatellininae Sykes, 1900
- Family Valloniidae E. S. Morse, 1864 (128)
- Family Vertiginidae Fitzinger, 1833 (305)
- Family Zuidae Bourguignat, 1884 accepted as Cochlicopidae Pilsbry, 1900 (1879)
- Superfamily Vertiginoidea Fitzinger, 1833 accepted as Pupilloidea W. Turton, 1831
- 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
