Between brackets is the number of accepted species

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- Mollusca (132 791)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (25 009)
- Class Caudofoveata (143)
- Class Cephalopoda (1 834)
- Class Conchifera accepted as Bivalvia
- Class Cricoconarida † (1)
- Class Gastropoda (102 697)
- Subclass Amphigastropoda † (390)
- Subclass Angiogastropoda represented as Gastropoda
- Subclass Apogastropoda
- Subclass Caenogastropoda (53 636)
- Subclass Gastropoda incertae sedis (308)
- Subclass Heterobranchia (39 156)
- Infraclass "Lower Heterobranchia" (1 137)
- Infraclass Euthyneura (37 433)
- Subterclass Acteonimorpha (411)
- Subterclass Ringipleura (2 917)
- Subterclass Tectipleura (34 105)
- Superorder Acochlidiimorpha (48)
- Superorder Ascoglossa accepted as Sacoglossa
- Superorder Basommatophora accepted as Hygrophila
- Superorder Eupulmonata (25 569)
- Order Aillyida accepted as Achatinina
- Order Ellobiida (579)
- Order Gymnomorpha accepted as Systellommatophora
- Order Stylommatophora (24 766)
- Suborder Achatinina (2 900)
- Suborder Elasmognatha accepted as Succineoidei
- Suborder Helicina (21 626)
- 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)
- 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)
- Subfamily Echinichinae F. G. Thompson & Naranjo-García, 2012 (3)
- Subfamily Epiphragmophorinae Hoffmann, 1928 accepted as Epiphragmophoridae Hoffmann, 1928
- Subfamily Helminthoglyptinae Pilsbry, 1939 (235)
- Tribe Helminthoglyptini Pilsbry, 1939 (136)
- Genus Cahuillus B. Roth, 1996 (5)
- Genus Chamaearionta S. S. Berry, 1930 (1)
- Genus Eremarionta Pilsbry, 1913 (10)
- Genus Eremariontoides W. B. Miller, 1981 accepted as Eremarionta Pilsbry, 1913
- Genus Greggelix W. B. Miller, 1972 (3)
- Genus Helminthoglypta Ancey, 1887 (73)
- Subgenus Helminthoglypta (Charodotes) Pilsbry, 1939 represented as Helminthoglypta Ancey, 1887
- Subgenus Helminthoglypta (Coyote) Reeder & B. Roth, 1988 represented as Helminthoglypta Ancey, 1887
- Subgenus Helminthoglypta (Helminthoglypta) Ancey, 1887 represented as Helminthoglypta Ancey, 1887
- Subgenus Helminthoglypta (Rothelix) W. B. Miller, 1985 accepted as Rothelix W. B. Miller, 1985
- Species Helminthoglypta allynsmithi Pilsbry, 1939
- Species Helminthoglypta arrosa (W. G. Binney, 1858)
- Species Helminthoglypta avus (Bartsch, 1916)
- Species Helminthoglypta ayresiana (Newcomb, 1861)
- Species Helminthoglypta benitoensis H. N. Lowe, 1930
- Species Helminthoglypta berryi G. D. Hanna, 1929
- Species Helminthoglypta bozemanensis B. Roth, 1986 †
- Species Helminthoglypta californiensis (I. Lea, 1838)
- Species Helminthoglypta callistoderma (Pilsbry & Ferriss, 1917)
- Species Helminthoglypta carpenteri (Newcomb, 1861)
- Species Helminthoglypta caruthersi Willett, 1934
- Species Helminthoglypta coelata (Bartsch, 1916)
- Species Helminthoglypta concolor B. Roth & Hochberg, 1988
- Species Helminthoglypta contracostae (Pilsbry, 1895)
- Species Helminthoglypta crotalina S. S. Berry, 1928
- Species Helminthoglypta cuyama G. D. Hanna & A. G. Smith, 1937
- Species Helminthoglypta cuyamacensis
- Species Helminthoglypta cypreophila (W. G. Binney & Bland, 1869)
- Species Helminthoglypta diabloensis (J. G. Cooper, 1869)
- Species Helminthoglypta dupetithouarsi (Deshayes, 1839)
- Species Helminthoglypta dupetithouarsii [sic] accepted as Helminthoglypta dupetithouarsi (Deshayes, 1839)
- Species Helminthoglypta edwardsi Gregg & W. B. Miller, 1976
- Species Helminthoglypta euomphalodes S. S. Berry, 1938
- Species Helminthoglypta exarata (L. Pfeiffer, 1857)
- Species Helminthoglypta expansilabris (Pilsbry, 1898)
- Species Helminthoglypta ferrissi Pilsbry, 1924
- Species Helminthoglypta fieldi Pilsbry, 1930
- Species Helminthoglypta fisheri (Bartsch, 1904)
- Species Helminthoglypta fontiphila Gregg, 1931
- Species Helminthoglypta graniticola S. S. Berry, 1926
- Species Helminthoglypta greggi Willett, 1931
- Species Helminthoglypta hannai Pilsbry, 1927
- Species Helminthoglypta hertleini G. D. Hanna & A. G. Smith, 1937
- Species Helminthoglypta huberi Thach, 2017 accepted as Hemiplecta lanxangnica Inkhavilay & Panha, 2019
- Species Helminthoglypta imperforata Pilsbry, 1939 accepted as Helminthoglypta tudiculata imperforata Pilsbry, 1939
- Species Helminthoglypta inglesi S. S. Berry, 1938
- Species Helminthoglypta intersessa B. Roth, 1987 accepted as Noyo intersessa (B. Roth, 1987)
- Species Helminthoglypta isabella S. S. Berry, 1938
- Species Helminthoglypta jaegeri S. S. Berry, 1928
- Species Helminthoglypta liodoma S. S. Berry, 1938
- Species Helminthoglypta mailliardi Pilsbry, 1926
- Species Helminthoglypta martini (G. D. Hanna, 1920) †
- Species Helminthoglypta micrometalleoides W. B. Miller, 1970
- Species Helminthoglypta milleri Reeder, 1986
- Species Helminthoglypta misiona E. P. Chace, 1937
- Species Helminthoglypta mohaveana S. S. Berry, 1927
- Species Helminthoglypta montezuma Reeder & W. B. Miller, 1986
- Species Helminthoglypta morroensis (Hemphill, 1911)
- Species Helminthoglypta napaea S. S. Berry, 1938
- Species Helminthoglypta nickliniana (I. Lea, 1838)
- Species Helminthoglypta obtusa F. M. Anderson & G. D. Hanna, 1925 † accepted as Labyrinthus obtusus (F. M. Anderson & G. D. Hanna, 1925) †
- Species Helminthoglypta orina S. S. Berry, 1938
- Species Helminthoglypta petricola (S. S. Berry, 1916)
- Species Helminthoglypta phlyctaena (Bartsch, 1916)
- Species Helminthoglypta piutensis Willett, 1938
- Species Helminthoglypta proles (Hemphill, 1892)
- Species Helminthoglypta reederi W. B. Miller, 1981
- Species Helminthoglypta reediana Willett, 1932
- Species Helminthoglypta riparia S. S. Berry, 1928 accepted as Helminthoglypta mohaveana S. S. Berry, 1927
- Species Helminthoglypta salviae B. Roth, 1987
- Species Helminthoglypta sanctaecrucis Pilsbry, 1927
- Species Helminthoglypta sequoia Pilsbry, 1928 accepted as Helminthoglypta tularensis sequoia Pilsbry, 1928
- Species Helminthoglypta sequoicola (J. G. Cooper, 1866)
- Species Helminthoglypta similans G. D. Hanna & A. G. Smith, 1937
- Species Helminthoglypta sonoma Pilsbry, 1937
- Species Helminthoglypta stageri Willett, 1938
- Species Helminthoglypta stiversiana (J. G. Cooper, 1875)
- Species Helminthoglypta talmadgei B. Roth, 1988
- Species Helminthoglypta taylori Reeder & B. Roth, 1988
- Species Helminthoglypta tejonis S. S. Berry, 1930
- Species Helminthoglypta thermimontis S. S. Berry, 1953
- Species Helminthoglypta traski (Newcomb, 1861) accepted as Helminthoglypta traskii (Newcomb, 1861)
- Species Helminthoglypta traskii (Newcomb, 1861)
- Species Helminthoglypta tudiculata (A. Binney, 1843)
- Subspecies Helminthoglypta tudiculata angelena S. S. Berry, 1938 accepted as Helminthoglypta tudiculata convicta (Pilsbry, 1913)
- Subspecies Helminthoglypta tudiculata convicta (Pilsbry, 1913)
- Subspecies Helminthoglypta tudiculata fairbanksi Reeder & W. B. Miller, 1986
- Subspecies Helminthoglypta tudiculata grippii (Pilsbry, 1913)
- Subspecies Helminthoglypta tudiculata imperforata Pilsbry, 1939
- Subspecies Helminthoglypta tudiculata kermensis S. S. Berry, 1929 accepted as Helminthoglypta cypreophila kernensis S. S. Berry, 1929
- Subspecies Helminthoglypta tudiculata kernensis S. S. Berry, 1930 accepted as Helminthoglypta cypreophila kernensis S. S. Berry, 1929
- Subspecies Helminthoglypta tudiculata subdola (Hemphill, 1890)
- Subspecies Helminthoglypta tudiculata tudiculata (A. Binney, 1843)
- Species Helminthoglypta tularensis (Hemphill, 1892)
- Species Helminthoglypta umbilicata (Pilsbry, 1898)
- Species Helminthoglypta uvasana B. Roth & Hochberg, 1992
- Species Helminthoglypta vasquezi B. Roth & Hochberg, 1992
- Species Helminthoglypta venturensis (Bartsch, 1916)
- Species Helminthoglypta walkeriana (Hemphill, 1911)
- Species Helminthoglypta waltoni Gregg & W. B. Miller, 1976
- Species Helminthoglypta willetti (S. S. Berry, 1920)
- Genus Herpeteros S. S. Berry, 1947 (6)
- Genus Martirelix W. B. Miller, 1982 (2)
- Genus Micrarionta Ancey, 1880 (10)
- Genus Noyo B. Roth, 1996 (1)
- Genus Plesarionta Pilsbry, 1939 accepted as Xerarionta (Plesarionta) Pilsbry, 1939
- Genus Rothelix W. B. Miller, 1985 (4)
- Genus Sonorelix S. S. Berry, 1943 (8)
- Genus Xerarionta Pilsbry, 1913 (13)
- Tribe Sonorelicini B. Roth, 1996 accepted as Helminthoglyptini Pilsbry, 1939
- Tribe Sonorellini Pilsbry, 1939 (95)
- Genus Glypterpes Pilsbry, 1893 † (3)
- Genus Mesoglypterpes Yen, 1952 † (1)
- Genus Pseudolisinoe Wenz, 1923 † accepted as Glypterpes Pilsbry, 1893 †
- Subfamily Humboldtianinae Pilsbry, 1939 (63)
- Subfamily Lysinoinae Hoffmann, 1928 (20)
- Subfamily Metostracinae H. Nordsieck, 1987 accepted as Metostracini H. Nordsieck, 1987
- Subfamily Monadeniinae H. Nordsieck, 1987 (19)
- Subfamily Xanthonychinae Strebel & Pfeffer, 1880 (5)
- Tribe Canariellini Schileyko, 1991 accepted as Canariellidae Schileyko, 1991
- Genus Laxecostula Harzhauser & Neubauer, 2020 † (1)
- Superfamily Sagdoidea Pilsbry, 1895 (199)
- Infraorder Limacoidei (4 251)
- 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