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)
- Superfamily Helicoidea Rafinesque, 1815 (5 491)
- Family Ariantidae Mörch, 1864 accepted as Ariantinae Mörch, 1864
- Family Bradybaenidae Pilsbry, 1934 (1898) accepted as Camaenidae Pilsbry, 1895
- Family Calyciidae Iredale, 1941 accepted as Hadrinae Iredale, 1937
- Family Camaenidae Pilsbry, 1895 (2 898)
- Family Canariellidae Schileyko, 1991 (56)
- Family Cepolidae Ihering, 1909 (102)
- Family Chloritidae Iredale, 1938 accepted as Hadrinae Iredale, 1937
- Family Cochlicellidae Schileyko, 1972 accepted as Cochlicellini Schileyko, 1972
- Family Cochlicellinae Schileyko, 1972 accepted as Cochlicellini Schileyko, 1972
- Family Cochlostylidae Möllendorff, 1890 accepted as Helicostylinae Ihering, 1909 (1890)
- Family Echinichidae F. G. Thompson & Naranjo-García, 2012 accepted as Echinichinae F. G. Thompson & Naranjo-García, 2012
- Family Elonidae E. Gittenberger, 1977 (63)
- Family Epiphragmophoridae Hoffmann, 1928 (72)
- Family Eulotidae Möllendorff, 1898 accepted as Bradybaenini Pilsbry, 1934 (1898)
- Family Geomitridae C. R. Boettger, 1909 (402)
- Family Helicellidae Ihering, 1909 accepted as Hygromiidae Tryon, 1866
- Family Helicidae Rafinesque, 1815 (500)
- Family Helicodontidae Kobelt, 1904 (26)
- Family Helminthoglyptidae Pilsbry, 1939 accepted as Helminthoglyptinae Pilsbry, 1939
- Family Humboldtianidae Pilsbry, 1939 accepted as Humboldtianinae Pilsbry, 1939
- Family Hygromiidae Tryon, 1866 (460)
- Family Jacostidae Pilsbry, 1948 accepted as Helicellini Ihering, 1909
- Family Labyrinthidae Borrero, Sei, D. G. Robinson & Rosenberg, 2017 (58)
- Family Lampadiidae Winckworth, 1945 accepted as Labyrinthidae Borrero, Sei, D. G. Robinson & Rosenberg, 2017
- Family Leucochroidae Westerlund, 1886 accepted as Sphincterochilinae Zilch, 1960 (1886)
- Family Lysinoidae Hoffmann, 1928 accepted as Lysinoinae Hoffmann, 1928
- Family Monadeniidae H. Nordsieck, 1987 accepted as Monadeniinae H. Nordsieck, 1987
- Family Papuinidae Iredale, 1938 accepted as Hadrinae Iredale, 1937
- Family Pentataeniidae Mörch, 1864 accepted as Helicini Rafinesque, 1815
- Family Planispiridae Iredale, 1941 accepted as Hadrinae Iredale, 1937
- Family Pleurodontidae Ihering, 1912 (57)
- Family Polygyridae Pilsbry, 1895 (311)
- Subfamily Polygyrinae Pilsbry, 1895 (93)
- Genus Acutidens Pilsbry, 1956 accepted as Linisa Pilsbry, 1930
- Genus Anchistoma H. Adams & A. Adams, 1855 accepted as Polygyra Say, 1818
- Genus Cyclodoma Swainson, 1840 accepted as Polygyra Say, 1818
- Genus Daedalochila H. Beck, 1837 (31)
- Genus Erectidens Pilsbry, 1953 (1)
- Genus Erymodon Pilsbry, 1956 accepted as Linisa Pilsbry, 1930
- Genus Giffordius Pilsbry, 1930 (2)
- Genus Linisa Pilsbry, 1930 (25)
- Species Linisa acutedentata (W. G. Binney, 1857)
- Species Linisa adamnis (Dall, 1890) †
- Species Linisa albicostulata (Pilsbry, 1896)
- Species Linisa anilis (Gabb, 1865)
- Species Linisa ariadnae (L. Pfeiffer, 1849)
- Species Linisa aulacomphala (Pilsbry & Hinkley, 1907)
- Species Linisa behrii (Gabb, 1865)
- Species Linisa bicruris (L. Pfeiffer, 1857)
- Species Linisa cantralli (Solem, 1957)
- Species Linisa couloni (Shuttleworth, 1852) accepted as Polygyra couloni (Shuttleworth, 1852)
- Species Linisa dissecta (E. von Martens, 1892) accepted as Polygyra dissecta E. von Martens, 1892
- Species Linisa dysoni (Shuttleworth, 1852) accepted as Polygyra dysoni (Shuttleworth, 1852)
- Species Linisa euglypta (Pilsbry, 1896)
- Species Linisa hertleini (F. Haas, 1961)
- Species Linisa hindsi (L. Pfeiffer, 1846)
- Species Linisa idiogenes (Pilsbry, 1956) accepted as Daedalochila idiogenes (Pilsbry, 1956)
- Species Linisa implicata (E. von Martens, 1865)
- Species Linisa matermontana (Pilsbry, 1896)
- Species Linisa nelsoni (Dall, 1897)
- Species Linisa oppilata (Morelet, 1849)
- Species Linisa pergrandis (Solem, 1959)
- Species Linisa plagioglossa (L. Pfeiffer, 1859) accepted as Polygyra plagioglossa (L. Pfeiffer, 1859)
- Species Linisa polita (Pilsbry & Hinkley, 1907)
- Species Linisa ponsonbyi (Pilsbry, 1896)
- Species Linisa rhoadsi (Pilsbry, 1899)
- Species Linisa richardsoni (E. von Martens, 1892)
- Species Linisa suprazonata (Pilsbry, 1899)
- Species Linisa tamaulipasensis (I. Lea, 1857)
- Species Linisa texasiana (S. Moricand, 1834)
- Species Linisa ventrosula (L. Pfeiffer, 1846)
- Species Linisa yucatanea (Morelet, 1849) accepted as Polygyra yucatanea (Morelet, 1849)
- Genus Lobosculum Pilsbry, 1930 (2)
- Genus Millerelix K. C. Emberton, 1995 accepted as Daedalochila H. Beck, 1837
- Genus Monophysis Pilsbry, 1956 accepted as Linisa Pilsbry, 1930
- Genus Polygira [sic] accepted as Polygyra Say, 1818
- Genus Polygra [sic] accepted as Polygyra Say, 1818
- Genus Polygyra Say, 1818 (13)
- Genus Praticola Strebel & Pfeffer, 1879 accepted as Praticolella E. von Martens, 1892
- Genus Praticolella E. von Martens, 1892 (18)
- Genus Solidens Pilsbry, 1956 accepted as Linisa Pilsbry, 1930
- Genus Trifaux H. B. Baker, 1935 (1)
- Genus Ulostoma Albers, 1850 accepted as Polygyra Say, 1818
- Subfamily Triodopsinae Pilsbry, 1940 (217)
- Genus Linisca [sic] accepted as Linisa Pilsbry, 1930
- Genus Zhenjiangospira W. Yü, 1977 † (1)
- Family Rhagadidae Iredale, 1938 accepted as Hadrinae Iredale, 1937
- Family Sphincterochilidae Zilch, 1960 (1886) (41)
- Family Thysanophoridae Pilsbry, 1926 (42)
- Family Trichodiscinidae H. Nordsieck, 1987 (11)
- Family Trissexodontidae H. Nordsieck, 1987 (46)
- Family Xanthonychidae Strebel & Pfeffer, 1880 (345)
- Tribe Canariellini Schileyko, 1991 accepted as Canariellidae Schileyko, 1991
- Genus Laxecostula Harzhauser & Neubauer, 2020 † (1)
- Superfamily Sagdoidea Pilsbry, 1895 (199)
- Infraorder Limacoidei (4 250)
- Infraorder Oleacinoidei (497)
- Infraorder Orthalicoidei (1 578)
- Infraorder Partuloinei accepted as Pupilloidei
- Infraorder Pupilloidei (3 436)
- 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