Between brackets is the number of accepted species
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- Mollusca (132 888)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (25 022)
- Class Caudofoveata (143)
- Class Cephalopoda (1 838)
- Class Conchifera accepted as Bivalvia
- Class Cricoconarida † (1)
- Class Gastropoda (102 777)
- Subclass Amphigastropoda † (396)
- Subclass Angiogastropoda represented as Gastropoda
- Subclass Apogastropoda
- Subclass Caenogastropoda (53 684)
- Subclass Gastropoda incertae sedis (309)
- Subclass Heterobranchia (39 180)
- Infraclass "Lower Heterobranchia" (1 137)
- Infraclass Euthyneura (37 457)
- Subterclass Acteonimorpha (411)
- Subterclass Ringipleura (2 917)
- Subterclass Tectipleura (34 129)
- Superorder Acochlidiimorpha (48)
- Superorder Ascoglossa accepted as Sacoglossa
- Superorder Basommatophora accepted as Hygrophila
- Superorder Eupulmonata (25 591)
- Order Aillyida accepted as Achatinina
- Order Ellobiida (579)
- Order Gymnomorpha accepted as Systellommatophora
- Order Stylommatophora (24 788)
- Suborder Achatinina (2 912)
- Suborder Elasmognatha accepted as Succineoidei
- Suborder Helicina (21 636)
- 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 (1 587)
- 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)
- Family Tornatellinidae Sykes, 1900 accepted as Tornatellininae Sykes, 1900
- Family Valloniidae E. S. Morse, 1864 (128)
- Family Vertiginidae Fitzinger, 1833 (305)
- Subfamily Nesopupinae Steenberg, 1925 (131)
- Genus Bothriopupa Pilsbry, 1898 (6)
- Genus Costigo O. Boettger, 1891 (3)
- Genus Cylindrovertilla O. Boettger, 1881 (4)
- Genus Glandicula F. Sandberger, 1875 † (2)
- Genus Helenopupa Pilsbry & C. M. Cooke, 1920 accepted as Nesopupa (Helenopupa) Pilsbry & C. M. Cooke, 1920
- Genus Indopupa Pilsbry & C. M. Cooke, 1920 (2)
- Genus Insulipupa Pilsbry & C. M. Cooke, 1920 (10)
- Genus Lyropupa Pilsbry, 1900 (23)
- Subgenus Lyropupa (Lyropupa) Pilsbry, 1900 represented as Lyropupa Pilsbry, 1900
- Subgenus Lyropupa (Lyropupilla) Pilsbry & C. M. Cooke, 1920 represented as Lyropupa Pilsbry, 1900
- Subgenus Lyropupa (Mirapupa) C. M. Cooke & Pilsbry, 1920 represented as Lyropupa Pilsbry, 1900
- Species Lyropupa anceyana C. M. Cooke & Pilsbry, 1920
- Species Lyropupa antiqua C. M. Cooke & Pilsbry, 1920 †
- Species Lyropupa carbonaria Ancey, 1904 accepted as Lyropupa lyrata (A. Gould, 1843)
- Species Lyropupa carbonifera [sic] accepted as Lyropupa carbonaria Ancey, 1904
- Species Lyropupa clathratula Ancey, 1904
- Species Lyropupa cookei Clench, 1952 accepted as Lyropupa anceyana C. M. Cooke & Pilsbry, 1920
- Species Lyropupa costata (Pease, 1871)
- Species Lyropupa cubana (Dall, 1890)
- Species Lyropupa cyrta C. M. Cooke & Pilsbry, 1920
- Species Lyropupa hawaiiensis Ancey, 1904
- Species Lyropupa kahoolavensis Pilsbry & C. M. Cooke, 1920 accepted as Lyropupa costata (Pease, 1871)
- Species Lyropupa lyrata (A. Gould, 1843)
- Species Lyropupa magdalenae (Ancey, 1892) accepted as Lyropupa lyrata (A. Gould, 1843)
- Species Lyropupa micra C. M. Cooke & Pilsbry, 1920
- Species Lyropupa microthauma Ancey, 1904
- Species Lyropupa mirabilis (Ancey, 1890)
- Species Lyropupa ovatula C. M. Cooke & Pilsbry, 1920
- Species Lyropupa perlonga (Pease, 1871)
- Species Lyropupa plagioptyx Pilsbry & C. M. Cooke, 1920
- Species Lyropupa prisca Ancey, 1904
- Species Lyropupa rhabdota C. M. Cooke & Pilsbry, 1920
- Species Lyropupa scabra Pilsbry & C. M. Cooke, 1920
- Species Lyropupa spaldingi Pilsbry & C. M. Cooke, 1920
- Species Lyropupa sparna C. M. Cooke & Pilsbry, 1920
- Species Lyropupa striatula (Pease, 1871)
- Species Lyropupa thaanumi C. M. Cooke & Pilsbry, 1920
- Species Lyropupa thaumasia C. M. Cooke & Pilsbry, 1920
- Species Lyropupa truncata C. M. Cooke, 1908
- Genus Minacilla H. Nordsieck, 2014 † (1)
- Genus Negulopsis H. Nordsieck, 2014 † (9)
- Genus Nesopupa Pilsbry, 1900 (52)
- Genus Nesopuparia Pilsbry, 1926 (1)
- Genus Nesopupilla Pilsbry & C. M. Cooke, 1920 accepted as Nesopupa (Nesopupilla) Pilsbry & C. M. Cooke, 1920
- Genus Nesoropupa Gargominy, 2008 (4)
- Genus Pagodella H. Adams, 1867 accepted as Nesopupa (Insulipupa) Pilsbry & C. M. Cooke, 1920
- Genus Paracraticula Oppenheim, 1890 † (2)
- Genus Pronesopupa Iredale, 1913 (11)
- Genus Ptychochilus O. Boettger, 1881 accepted as Nesopupa Pilsbry, 1900
- Genus Somniopupa Iredale, 1937 accepted as Nesopupa Pilsbry, 1900
- Genus Staurodon R. T. Lowe, 1852 accepted as Vertigo (Staurodon) R. T. Lowe, 1852
- Genus Trigonopupa H. Nordsieck, 2014 † (1)
- Subfamily Vertigininae Fitzinger, 1833 (170)
- Genus Acmopupa O. Boettger, 1889 † (1)
- Genus Propupa Stworzewicz & Pokryszko, 2006 † (1)
- Genus Pseudelix O. Boettger, 1889 † (1)
- Genus Tetoripupa Isaji, 2010 † (1)
- Genus Wallivertilla Iredale, 1937 accepted as Cylindrovertilla O. Boettger, 1881
- 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 (1 036)
- 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 (6 783)
- 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
