Between brackets is the number of accepted species

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- Mollusca (132 454)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (24 899)
- Class Caudofoveata (143)
- Class Cephalopoda (1 810)
- Class Conchifera accepted as Bivalvia
- Class Cricoconarida † (1)
- Class Gastropoda (102 494)
- Subclass Amphigastropoda † (382)
- Subclass Angiogastropoda represented as Gastropoda
- Subclass Apogastropoda
- Subclass Caenogastropoda (53 462)
- Subclass Gastropoda incertae sedis (307)
- Subclass Heterobranchia (39 144)
- Infraclass "Lower Heterobranchia" (1 137)
- Infraclass Euthyneura (37 421)
- Subterclass Acteonimorpha (411)
- Subterclass Ringipleura (2 916)
- Subterclass Tectipleura (34 094)
- Superorder Acochlidiimorpha (48)
- Superorder Ascoglossa accepted as Sacoglossa
- Superorder Basommatophora accepted as Hygrophila
- Superorder Eupulmonata (25 561)
- Order Aillyida accepted as Achatinina
- Order Ellobiida (580)
- Order Gymnomorpha accepted as Systellommatophora
- Order Stylommatophora (24 757)
- Suborder Achatinina (2 899)
- Suborder Elasmognatha accepted as Succineoidei
- Suborder Helicina (21 618)
- Infraorder Arionoidei (139)
- Infraorder Clausilioidei (1 859)
- Infraorder Helicina incertae sedis (3 208)
- Superfamily Coelociontoidea Iredale, 1937 (5)
- Superfamily Papillodermatoidea Wiktor, R. Martin & Castillejo, 1990 (1)
- Superfamily Plectopyloidea Möllendorff, 1898 (144)
- Superfamily Punctoidea E. S. Morse, 1864 (1 789)
- Family Charopidae F. W. Hutton, 1884 (1 118)
- Family Cystopeltidae T. D. A. Cockerell, 1891 (34)
- Family Dipnelicidae Iredale, 1937 accepted as Charopidae F. W. Hutton, 1884
- Family Discidae Thiele, 1931 (1866) (91)
- Family Endodontidae Pilsbry, 1895 (225)
- Genus Aaadonta Solem, 1976 (6)
- Genus Anceyodonta Solem, 1976 (14)
- Genus Australdonta Solem, 1976 (21)
- Genus Beilania Preston, 1913 (2)
- Genus Biplicatum S. Ouyang, W. Gan, X. P. Wu & X. F. Xu, 2010 (1)
- Genus Cookeconcha Solem, 1976 (19)
- Genus Endodonta Albers, 1850 (12)
- Genus Gambiodonta Solem, 1976 (6)
- Genus Garrettia Cossmann, 1900 accepted as Libera Garrett, 1881
- Genus Garrettina Thiele, 1931 accepted as Libera Garrett, 1881
- Genus Hebeispira Youluo, 1978 † (1)
- Genus Kleokyphus Solem, 1976 (3)
- Genus Kondoconcha Solem, 1976 (1)
- Genus Libera Garrett, 1881 (18)
- Species Libera bursatella (A. Gould, 1846)
- Species Libera cavernula (Hombron & Jacquinot, 1847)
- Species Libera coarctata Garrett, 1884 accepted as Libera dubiosa Ancey, 1889
- Species Libera cookeana Solem, 1976
- Species Libera dubiosa Ancey, 1889
- Species Libera fratercula (Pease, 1867)
- Species Libera garrettiana Solem, 1976
- Species Libera gregaria Garrett, 1884
- Species Libera heynemanni (L. Pfeiffer, 1862)
- Species Libera incognata Solem, 1976
- Species Libera jacquinoti (L. Pfeiffer, 1849) accepted as Libera cavernula (Hombron & Jacquinot, 1847)
- Species Libera kondoi Christensen, Khan & Kirch, 2018
- Species Libera micrasoma Solem, 1976
- Species Libera recedens Garrett, 1884
- Species Libera retunsa (Pease, 1865)
- Species Libera spuria Ancey, 1889
- Species Libera streptaxon (Reeve, 1852)
- Species Libera subcavernula (Tryon, 1887)
- Species Libera tumuloides (Garrett, 1872)
- Species Libera umbilicata Solem, 1976
- Genus Mautodontha Solem, 1976 (26)
- Genus Minidonta Solem, 1976 (29)
- Genus Nesodiscus Thiele, 1931 (9)
- Genus Nesophila Pilsbry, 1893 (4)
- Genus Opanara Solem, 1976 (9)
- Genus Orangia Solem, 1976 (3)
- Genus Planudonta Solem, 1976 (4)
- Genus Priceconcha Solem, 1973 (1)
- Genus Protoendodonta Solem, 1977 † (1)
- Genus Pseudolibera Solem, 1976 (9)
- Genus Rhysoconcha Solem, 1976 (2)
- Genus Rikitea Solem & C. M. Cooke, 1976 (2)
- Genus Ruatara Solem, 1976 (2)
- Genus Taipidon Solem, 1976 (10)
- Genus Thaumatodon Pilsbry, 1893 (9)
- Genus Zyzzyxdonta Solem, 1976 (1)
- Family Flammulinidae Crosse, 1895 accepted as Flammulininae Crosse, 1895
- Family Gonyodiscidae A. J. Wagner, 1928 accepted as Discidae Thiele, 1931 (1866)
- Family Hedleyoconchidae Iredale, 1942 accepted as Charopidae F. W. Hutton, 1884
- Family Helicodiscidae Pilsbry, 1927 (37)
- Family Laomidae Suter, 1913 accepted as Punctidae E. S. Morse, 1864
- Family Oopeltidae T. D. A. Cockerell, 1891 (11)
- Family Oreohelicidae Pilsbry, 1939 (68)
- Family Paralaomidae Iredale, 1941 accepted as Punctidae E. S. Morse, 1864
- Family Patulastridae Steenberg, 1925 accepted as Punctidae E. S. Morse, 1864
- Family Patulidae Tryon, 1866 accepted as Discidae Thiele, 1931 (1866)
- Family Phenacohelicidae Suter, 1892 accepted as Charopinae F. W. Hutton, 1884
- Family Pseudocharopidae Iredale, 1944 accepted as Charopidae F. W. Hutton, 1884
- Family Punctidae E. S. Morse, 1864 (203)
- Family Trachycystidae Schileyko, 1986 accepted as Trachycystinae Schileyko, 1986
- Genus Afrodontops Kadolsky, 2020 † (2)
- Superfamily Testacelloidea J. E. Gray, 1840 (20)
- Superfamily Urocoptoidea Pilsbry, 1898 (1868) (1 249)
- Infraorder Helicoidei (5 687)
- Infraorder Limacoidei (4 251)
- Infraorder Oleacinoidei (497)
- Infraorder Orthalicoidei (1 577)
- Infraorder Partuloinei accepted as Pupilloidei
- Infraorder Pupilloidei (3 435)
- 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 (2 004)
- Superorder Pneumopulmonata
- Superorder Pylopulmonata (4 283)
- 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 (1 908)
- Subclass Orthogastropoda represented as Gastropoda
- Subclass Patellogastropoda (510)
- Subclass Prosobranchia
- Subclass Psilogastropoda represented as Gastropoda
- Subclass Vetigastropoda (6 781)
- 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