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)
- 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)
- 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)
- Subfamily Achatinellinae Gulick, 1873 (97)
- Genus Achatinella Swainson, 1828 (38)
- Genus Achatinellastrum L. Pfeiffer, 1854 accepted as Achatinella (Achatinellastrum) L. Pfeiffer, 1854
- Genus Apex E. von Martens, 1860 accepted as Achatinella Swainson, 1828
- Genus Bulimella L. Pfeiffer, 1854 accepted as Achatinella (Bulimella) L. Pfeiffer, 1854
- Genus Eburnella Pease, 1870 accepted as Partulina (Eburnella) Pease, 1870
- Genus Helicter Pease, 1862 accepted as Achatinella (Achatinellastrum) L. Pfeiffer, 1854
- Genus Helicterella Gulick, 1873 accepted as Achatinella (Achatinellastrum) L. Pfeiffer, 1854
- Genus Newcombia L. Pfeiffer, 1854 (8)
- Genus Partulina L. Pfeiffer, 1854 (42)
- Subgenus Partulina (Baldwinia) Ancey, 1899 represented as Partulina L. Pfeiffer, 1854
- Species Partulina (Baldwinia) confusa (Sykes, 1900) represented as Partulina confusa (Sykes, 1900)
- Species Partulina (Baldwinia) dubia (Newcomb, 1853) represented as Partulina dubia (Newcomb, 1853)
- Species Partulina (Baldwinia) errans Pilsbry & C. M. Cooke, 1913 represented as Partulina errans Pilsbry & C. M. Cooke, 1913
- Species Partulina (Baldwinia) grisea (Newcomb, 1854) represented as Partulina grisea (Newcomb, 1854)
- Species Partulina (Baldwinia) horneri Baldwin, 1895 represented as Partulina horneri (Baldwin, 1895)
- Species Partulina (Baldwinia) kapuana J. J. Gouveia & A. Gouveia, 1920 represented as Partulina kapuana J. J. Gouveia & A. Gouveia, 1920
- Species Partulina (Baldwinia) konana Pilsbry & C. M. Cooke, 1914 represented as Partulina konana Pilsbry & C. M. Cooke, 1914
- Species Partulina (Baldwinia) pexa (Gulick, 1856) accepted as Partulina dubia (Newcomb, 1853)
- Species Partulina (Baldwinia) physa (Newcomb, 1854) represented as Partulina physa (Newcomb, 1854)
- Species Partulina (Baldwinia) puupiliensis Severns, 2011 represented as Partulina puupiliensis Severns, 2011
- Species Partulina (Baldwinia) thaanumiana Pilsbry, 1913 represented as Partulina thaanumiana Pilsbry, 1913
- Subgenus Partulina (Eburnella) Pease, 1870 represented as Partulina L. Pfeiffer, 1854
- Subgenus Partulina (Partulina) L. Pfeiffer, 1854 represented as Partulina L. Pfeiffer, 1854
- Subgenus Partulina (Partulinella) Hyatt, 1914 accepted as Partulina (Partulina) L. Pfeiffer, 1854
- Subgenus Partulina (Perdicella) Pease, 1870 accepted as Perdicella Pease, 1870
- Species Partulina ampulla (Gulick, 1856) accepted as Partulina tappaniana ampulla (Gulick, 1856)
- Species Partulina anceyana (Baldwin, 1895)
- Species Partulina aptycha (L. Pfeiffer, 1855) accepted as Achatinella pulcherrima aptycha L. Pfeiffer, 1855
- Species Partulina aptycha L. Pfeiffer, 1855 sensu Cowie et al., 1995
- Species Partulina arnemanni C. M. Cooke & Y. Kondo, 1952
- Species Partulina carnicolor Baldwin, 1906 accepted as Partulina tappaniana carnicolor Baldwin, 1906
- Species Partulina compta Pease, 1869 accepted as Partulina dwightii compta Pease, 1869
- Species Partulina confusa (Sykes, 1900)
- Species Partulina cooperi Baldwin, 1906 accepted as Achatinella wailuaensis Sykes, 1900
- Species Partulina crassa (Newcomb, 1854)
- Species Partulina crocea (Gulick, 1856) accepted as Partulina lignaria crocea (Gulick, 1856)
- Species Partulina denselineata (Reeve, 1850) accepted as Partulina radiata (A. Gould, 1845)
- Species Partulina dolei (Baldwin, 1895)
- Species Partulina dubia (Newcomb, 1853)
- Species Partulina dubiosa (C. B. Adams, 1851)
- Species Partulina dwightii (Newcomb, 1855)
- Species Partulina errans Pilsbry & C. M. Cooke, 1913 accepted as Partulina physa errans Pilsbry & C. M. Cooke, 1913
- Species Partulina fasciata (Gulick, 1856)
- Species Partulina flemingi Baldwin, 1906 accepted as Partulina porcellana flemingi Baldwin, 1906
- Species Partulina fulvicans Baldwin, 1906 accepted as Partulina porcellana fulvicans Baldwin, 1906
- Species Partulina fusoidea (Newcomb, 1855) accepted as Partulina terebra fusoidea (Newcomb, 1855)
- Species Partulina germana (Newcomb, 1854)
- Species Partulina gouldi Newcomb, 1853 accepted as Achatinella gouldii Newcomb, 1853
- Species Partulina grisea (Newcomb, 1854)
- Species Partulina hayseldeni Baldwin, 1896 accepted as Partulina semicarinata hayseldeni Baldwin, 1896
- Species Partulina hobdyi Severns, 2011
- Species Partulina horneri (Baldwin, 1895)
- Species Partulina idae Borcherding, 1901 accepted as Partulina rufa idae Borcherding, 1901
- Species Partulina induta (Gulick, 1856)
- Species Partulina kaaeana Baldwin, 1906 accepted as Partulina induta kaaeana Baldwin, 1906
- Species Partulina kapuana J. J. Gouveia & A. Gouveia, 1920
- Species Partulina konana Pilsbry & C. M. Cooke, 1914 accepted as Partulina physa konana Pilsbry & C. M. Cooke, 1914
- Species Partulina lemmoni Baldwin, 1906 accepted as Partulina dolei (Baldwin, 1895)
- Species Partulina lignaria (Gulick, 1856)
- Species Partulina macrodon Borcherding, 1901 accepted as Partulina dwightii macrodon Borcherding, 1901
- Species Partulina marmorata (A. Gould, 1847)
- Species Partulina meyeri Borcherding, 1901 accepted as Partulina tessellata meyeri Borcherding, 1901
- Species Partulina mighelsiana (L. Pfeiffer, 1848)
- Species Partulina montagui Pilsbry, 1913
- Species Partulina mutabilis Baldwin, 1908
- Species Partulina nattii (Hartman, 1888)
- Species Partulina nivea (Baldwin, 1895) accepted as Partulina tappaniana tappaniana (C. B. Adams, 1851)
- Species Partulina perdix (Reeve, 1850)
- Species Partulina physa (Newcomb, 1854)
- Species Partulina plumbea (Gulick, 1856)
- Species Partulina porcellana (Newcomb, 1854)
- Species Partulina proxima (Pease, 1862)
- Species Partulina puupiliensis Severns, 2011
- Species Partulina radiata (A. Gould, 1845)
- Species Partulina redfieldi (Newcomb, 1853)
- Species Partulina redfieldii [sic] accepted as Partulina redfieldi (Newcomb, 1853)
- Species Partulina rufa (Newcomb, 1853)
- Species Partulina schauinslandi Borcherding, 1901 accepted as Partulina proxima schauinslandi Borcherding, 1901
- Species Partulina semicarinata (Newcomb, 1854)
- Species Partulina splendida (Newcomb, 1853)
- Species Partulina subpolita Pilsbry & C. M. Cooke, 1912
- Species Partulina talpina (Gulick, 1856) accepted as Partulina splendida (Newcomb, 1853)
- Species Partulina tappaniana (C. B. Adams, 1851)
- Species Partulina terebra (Newcomb, 1854)
- Species Partulina tessellata (Newcomb, 1853)
- Species Partulina thaanumiana Pilsbry, 1913
- Species Partulina theodorei (Baldwin, 1895)
- Species Partulina ustulata (Gulick, 1856)
- Species Partulina variabilis (Newcomb, 1854)
- Species Partulina virgulata (Mighels, 1845)
- Species Partulina winniei Baldwin, 1908 accepted as Partulina terebra winniei Baldwin, 1908
- Genus Perdicella Pease, 1870 (9)
- Genus Rugosella Coen, 1945 accepted as Partulina (Baldwinia) Ancey, 1899
- Subfamily Auriculellinae Odhner, 1921 (33)
- Subfamily Elasmatininae Iredale, 1937 (54)
- Subfamily Lamellideinae C. M. Cooke & Y. Kondo, 1961 accepted as Pacificellinae Steenberg, 1925
- Subfamily Pacificellinae Steenberg, 1925 (33)
- Subfamily Tekoulininae Solem, 1972 (1)
- Subfamily Tornatellidinae C. M. Cooke & Y. Kondo, 1961 (75)
- Subfamily Tornatellininae Sykes, 1900 (44)
- 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)
- 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
