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)
- 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)
- Genus Ambages Gude, 1912 accepted as Labyrinthus H. Beck, 1837
- Genus Isomeria Albers, 1850 (30)
- Genus Labyrinthus H. Beck, 1837 (28)
- Subgenus Labyrinthus (Ambages) Gude, 1912 accepted as Labyrinthus H. Beck, 1837
- Subgenus Labyrinthus (Isomeria) Albers, 1850 accepted as Isomeria Albers, 1850
- Subgenus Labyrinthus (Labyrinthus) H. Beck, 1837 represented as Labyrinthus H. Beck, 1837
- Species Labyrinthus aenigma (Dohrn, 1875)
- Species Labyrinthus aenigmus [sic] accepted as Labyrinthus aenigma (Dohrn, 1875)
- Species Labyrinthus assimilans E. A. Smith, 1897 accepted as Labyrinthus otostomus assimilans E. A. Smith, 1897
- Species Labyrinthus baeri (Dautzenberg, 1902) accepted as Labyrinthus tarapotoensis baeri (Dautzenberg, 1902)
- Species Labyrinthus bifurcatus (Deshayes, 1838)
- Species Labyrinthus clappi (Pilsbry, 1901)
- Species Labyrinthus colombiensis S. I. Da Costa, 1901 accepted as Labyrinthus clappi (Pilsbry, 1901)
- Species Labyrinthus creveauxianus (Ancey, 1890)
- Species Labyrinthus diminutus Gude, 1903
- Species Labyrinthus dunkeri (Reeve, 1852)
- Species Labyrinthus ellipsostomus (Reeve, 1854)
- Species Labyrinthus euclausus R. H. Beddome, 1908
- Species Labyrinthus furcillatus (Hupé, 1853)
- Species Labyrinthus isodon (Reeve, 1853)
- Species Labyrinthus leprieurii (Petit de la Saussaye, 1840)
- Species Labyrinthus leucodon (L. Pfeiffer, 1847)
- Species Labyrinthus magdalenensis Solem, 1966
- Species Labyrinthus manueli E. T. Higgins, 1872
- Species Labyrinthus marmatensis Pilsbry, 1910
- Species Labyrinthus obtusus (F. M. Anderson & G. D. Hanna, 1925) †
- Species Labyrinthus otis ([Lightfoot], 1786)
- Species Labyrinthus otostomus (Reeve, 1852)
- Species Labyrinthus plicatus (Born, 1778)
- Species Labyrinthus pronus Pilsbry, 1932
- Species Labyrinthus quadridentatus (Broderip, 1832)
- Species Labyrinthus raimondii (R. A. Philippi, 1867)
- Species Labyrinthus sharmani (Gude, 1912)
- Species Labyrinthus sieversi (E. von Martens, 1889)
- Species Labyrinthus subplanatus (Petit de la Saussaye, 1843)
- Species Labyrinthus tamsianus (Dunker, 1847)
- Species Labyrinthus tarapotoensis (J. Moricand, 1858)
- Species Labyrinthus triplicatus (E. von Martens, 1868)
- Species Labyrinthus umbrus F. G. Thompson, 1957 accepted as Labyrinthus leucodon umbrus F. G. Thompson, 1957
- Species Labyrinthus unciger Solem, 1966 accepted as Labyrinthus uncigerus (Petit de la Saussaye, 1838)
- Species Labyrinthus uncigerus (Petit de la Saussaye, 1838)
- Subspecies Labyrinthus uncigerus chiriquensis (Pilsbry, 1910)
- Subspecies Labyrinthus uncigerus tau (Pilsbry, 1926)
- Subspecies Labyrinthus uncigerus uncigerus (Petit de la Saussaye, 1838)
- Species Labyrinthus vexans (Dohrn, 1875)
- Genus Lampadion Röding, 1798 accepted as Labyrinthus H. Beck, 1837
- Genus Lyrostoma Swainson, 1840 accepted as Labyrinthus H. Beck, 1837
- 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)
- Tribe Canariellini Schileyko, 1991 accepted as Canariellidae Schileyko, 1991
- Genus Laxecostula Harzhauser & Neubauer, 2020 † (1)
- Superfamily Sagdoidea Pilsbry, 1895 (200)
- Infraorder Limacoidei (4 251)
- Infraorder Oleacinoidei (497)
- Infraorder Orthalicoidei (1 587)
- 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 (1 036)
- 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