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)
- 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)
- 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)
- 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)
- Genus Agallospira W. Yü, 1977 † (1)
- Genus Coelostrobilops Pilsbry, 1931 (1)
- Genus Discostrobilops Pilsbry, 1927 (8)
- Genus Enteroplax Gude, 1899 (8)
- Genus Eostrobilops Pilsbry, 1927 (25)
- Genus Nesostrobilops Pilsbry, 1931 (1)
- Genus Palaeostrobilops H.-L. Gu, 1988 † (1)
- Genus Prionolabium W. Yü, 1982 † (2)
- Genus Strobila E. S. Morse, 1864 accepted as Strobilops Pilsbry, 1893
- Genus Strobilops Pilsbry, 1893 (37)
- Subgenus Strobilops (Coelostrobilops) Pilsbry, 1931 accepted as Coelostrobilops Pilsbry, 1931
- Subgenus Strobilops (Discostrobilops) Pilsbry, 1927 accepted as Discostrobilops Pilsbry, 1927
- Species Strobilops (Discostrobilops) hubbardi (A. D. Brown, 1861) represented as Discostrobilops hubbardi (A. D. Brown, 1861)
- Species Strobilops (Discostrobilops) lata H.-J. Wang, 1977 † accepted as Discostrobilops latus (H.-J. Wang, 1977) †
- Species Strobilops (Discostrobilops) pilsbryi J. P. E. Morrison, 1953 represented as Strobilops pilsbryi J. P. E. Morrison, 1953
- Species Strobilops (Discostrobilops) sinaloa J. P. E. Morrison, 1953 accepted as Discostrobilops sinaloa (J. P. E. Morrison, 1953)
- Species Strobilops (Discostrobilops) uniplicatus (A. Braun, 1851) † accepted as Discostrobilops uniplicatus (A. Braun, 1851) †
- Subgenus Strobilops (Enteroplax) Gude, 1899 accepted as Enteroplax Gude, 1899
- Subgenus Strobilops (Eostrobilops) Pilsbry, 1927 accepted as Eostrobilops Pilsbry, 1927
- Subgenus Strobilops (Nesostrobilops) Pilsbry, 1931 accepted as Nesostrobilops Pilsbry, 1931
- Subgenus Strobilops (Palaeostrobilops) Krumbiegel, 1962 † represented as Strobilops Pilsbry, 1893
- Subgenus Strobilops (Strobilops) Pilsbry, 1893 represented as Strobilops Pilsbry, 1893
- Species Strobilops aenea Pilsbry, 1926 accepted as Strobilops aeneus Pilsbry, 1926
- Species Strobilops aeneus Pilsbry, 1926
- Species Strobilops affinis Pilsbry, 1893
- Species Strobilops bilamellatus (Clessin, 1885) † accepted as Strobilops costatus (Clessin, 1877) †
- Species Strobilops boettgeri (Andreae, 1902) † accepted as Eostrobilops boettgeri (Andreae, 1902) †
- Species Strobilops brasilianus F. Baker, 1914
- Species Strobilops californica W. B. Miller & Christensen, 1980 accepted as Strobilops californicus W. B. Miller & Christensen, 1980
- Species Strobilops californicus W. B. Miller & Christensen, 1980
- Species Strobilops carbonaria Krumbiegel, 1962 †
- Species Strobilops coreana Pilsbry, 1927 accepted as Eostrobilops coreanus (Pilsbry, 1927)
- Species Strobilops costata (Clessin, 1877) † accepted as Strobilops costatus (Clessin, 1877) †
- Species Strobilops costatus (Clessin, 1877) †
- Species Strobilops desmarestinus (Brongniart, 1810) †
- Species Strobilops diptyx (O. Boettger, 1869) † accepted as Eostrobilops diptyx (O. Boettger, 1869) †
- Species Strobilops fischeri Wenz, 1915 † accepted as Eostrobilops fischeri (Wenz, 1915) †
- Species Strobilops floridanus Pilsbry, 1909 accepted as Strobilops texasianus Pilsbry & Ferriss, 1906
- Species Strobilops gedanensis (Klebs, 1886) †
- Species Strobilops hannai Pilsbry, 1931
- Species Strobilops headonensis (F. E. Edwards, 1852) †
- Species Strobilops helleri (Dall, 1900) accepted as Nesostrobilops helleri (Dall, 1900)
- Species Strobilops hirasei Pilsbry, 1908 accepted as Eostrobilops hirasei (Pilsbry, 1908)
- Species Strobilops hubbardi (A. D. Brown, 1861) accepted as Discostrobilops hubbardi (A. D. Brown, 1861)
- Species Strobilops joossii (Gottschick, 1911) †
- Species Strobilops kongoensis Kuroda & Miyanaga, 1939 accepted as Eostrobilops kongoensis (Kuroda & Miyanaga, 1939)
- Species Strobilops labyrinthica (Say, 1817) accepted as Strobilops labyrinthicus (Say, 1817)
- Species Strobilops labyrinthiculus (Michaud, 1855) †
- Species Strobilops labyrinthicus (Say, 1817)
- Species Strobilops lata H.-J. Wang, 1977 † accepted as Discostrobilops latus (H.-J. Wang, 1977) †
- Species Strobilops lonsdalei Ho & A. B. Leonard, 1961 accepted as Strobilops texasianus Pilsbry & Ferriss, 1906
- Species Strobilops luosigangensis W. Yü, 1982 †
- Species Strobilops mauryae C. S. Ferreira & Coelho, 1971 † accepted as Brasilennea arethusae Maury, 1935 †
- Species Strobilops menardi (Brongniart, 1810) †
- Species Strobilops menneri Prysjazhnjuk, 1978 †
- Species Strobilops monilia (Deshayes, 1863) †
- Species Strobilops morsei (Dall, 1885)
- Species Strobilops multidenticulata H.-J. Wang, 1982 † accepted as Strobilops multidenticulus H.-J. Wang, 1982 †
- Species Strobilops multidenticulus H.-J. Wang, 1982 †
- Species Strobilops nipponica Pilsbry, 1927 accepted as Eostrobilops nipponicus (Pilsbry, 1927)
- Species Strobilops pachychila Soós, 1955 † accepted as Strobilops pachychilus Soós, 1955 †
- Species Strobilops pachychilus Soós, 1955 †
- Species Strobilops pappi Schlickum, 1970 †
- Species Strobilops pilsbryi J. P. E. Morrison, 1953 accepted as Strobilops hubbardi (A. D. Brown, 1861)
- Species Strobilops piratica Pilsbry, 1930 accepted as Strobilops piraticus Pilsbry, 1930
- Species Strobilops piraticus Pilsbry, 1930
- Species Strobilops planus (Clessin, 1885) †
- Species Strobilops pseudolabyrinthicus (F. Sandberger, 1871) †
- Species Strobilops quadrasi (Möllendorff, 1893) accepted as Enteroplax quadrasi (Möllendorff, 1893)
- Species Strobilops romani Wenz, 1915 †
- Species Strobilops salvini (Tristram, 1863)
- Species Strobilops sandbergeri (Łomnicki, 1886) †
- Species Strobilops sinaloa J. P. E. Morrison, 1953 accepted as Discostrobilops sinaloa (J. P. E. Morrison, 1953)
- Species Strobilops sparsicostata F. C. Baker, 1938 † accepted as Strobilops sparsicostatus F. C. Baker, 1938 †
- Species Strobilops sparsicostatus F. C. Baker, 1938 †
- Species Strobilops steklovi Prysjazhnjuk, 1978 †
- Species Strobilops stenostoma W. Yü & X.-Q. Zhang, 1982 †
- Species Strobilops strebeli (L. Pfeiffer, 1861)
- Species Strobilops texasianus Pilsbry & Ferriss, 1906
- Species Strobilops tiarula (F. Sandberger, 1886) †
- Species Strobilops trochospira (Möllendorff, 1893) accepted as Enteroplax trochospira (Möllendorff, 1887)
- Species Strobilops ukrainicaeformis Prysjazhnjuk, 1978 †
- Species Strobilops ukrainicus Steklov, 1966 †
- Species Strobilops uniplicata (A. Braun, 1851) † accepted as Discostrobilops uniplicatus (A. Braun, 1851) †
- Species Strobilops uniplicatus (A. Braun, 1851) † accepted as Discostrobilops uniplicatus (A. Braun, 1851) †
- Species Strobilops vanderdusseni Karnekamp, 2000 †
- Species Strobilops veracruzensis Pilsbry, 1927
- Species Strobilops virgo Pilsbry, 1893 accepted as Strobilops labyrinthicus (Say, 1817)
- Species Strobilops wenzianus Pilsbry, 1930 accepted as Coelostrobilops wenzianus (Pilsbry, 1930)
- Genus Strobilus "E. S. Morse, 1864" accepted as Strobila E. S. Morse, 1864
- Genus Xuanchengospira W. Yü, 1982 † (1)
- 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