Between brackets is the number of accepted species

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- Mollusca (133 145)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (25 075)
- Class Caudofoveata (143)
- Class Cephalopoda (1 877)
- Class Conchifera accepted as Bivalvia
- Class Cricoconarida † (1)
- Class Gastropoda (102 937)
- Subclass Amphigastropoda † (423)
- Subclass Angiogastropoda represented as Gastropoda
- Subclass Apogastropoda
- Subclass Caenogastropoda (53 772)
- Subclass Gastropoda incertae sedis (309)
- Subclass Heterobranchia (39 216)
- Infraclass "Lower Heterobranchia" (1 139)
- Infraclass Euthyneura (37 491)
- Subterclass Acteonimorpha (411)
- Subterclass Ringipleura (2 917)
- Subterclass Tectipleura (34 163)
- Superorder Acochlidiimorpha (48)
- Superorder Ascoglossa accepted as Sacoglossa
- Superorder Basommatophora accepted as Hygrophila
- Superorder Eupulmonata (25 623)
- Order Aillyida accepted as Achatinina
- Order Ellobiida (579)
- Order Gymnomorpha accepted as Systellommatophora
- Order Stylommatophora (24 820)
- Suborder Achatinina (2 912)
- Suborder Elasmognatha accepted as Succineoidei
- Suborder Helicina (21 668)
- Infraorder Arionoidei (140)
- Infraorder Clausilioidei (1 859)
- Infraorder Helicina incertae sedis (3 210)
- Infraorder Helicoidei (5 698)
- Superfamily Helicoidea Rafinesque, 1815 (5 498)
- 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 (2 901)
- 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 (403)
- Family Helicellidae Ihering, 1909 accepted as Hygromiidae Tryon, 1866
- Family Helicidae Rafinesque, 1815 (501)
- Subfamily Ariantinae Mörch, 1864 (153)
- Genus Agalactochilus Kadolsky, H. Binder & Neubauer, 2016 † (6)
- Genus Arianta W. Turton, 1831 (9)
- Subgenus Arianta (Altarianta) Schileyko, 2013 accepted as Arianta W. Turton, 1831
- Subgenus Arianta (Arianta) W. Turton, 1831 accepted as Arianta W. Turton, 1831
- Species Arianta aethyops (M. Bielz, 1851)
- Species Arianta arbustorum (Linnaeus, 1758)
- Subspecies Arianta arbustorum alpicola (A. Férussac, 1821)
- Subspecies Arianta arbustorum arbustorum (Linnaeus, 1758)
- Subspecies Arianta arbustorum canigonensis (Boubée, 1833)
- Subspecies Arianta arbustorum doriae (Paulucci, 1878)
- Subspecies Arianta arbustorum gaillardi (Germain, 1912) †
- Subspecies Arianta arbustorum picea (Rossmässler, 1837)
- Subspecies Arianta arbustorum pseudorudis (Schlesch, 1924)
- Subspecies Arianta arbustorum repellini (Reeve, 1852)
- Subspecies Arianta arbustorum styriaca (Frauenfeld, 1868)
- Subspecies Arianta arbustorum vareliensis Ripken & Falkner, 2000
- Variety Arianta arbustorum var. roseolabiata Schlesch, 1908 accepted as Arianta arbustorum (Linnaeus, 1758)
- Species Arianta chamaeleon (L. Pfeiffer, 1868)
- Species Arianta frangepanii (Kobelt, 1906)
- Species Arianta hessei (M. Kimakowicz, 1883)
- Species Arianta petrii (M. Kimakowicz, 1890)
- Species Arianta schmidtii (Rossmässler, 1836)
- Species Arianta stenzii (Rossmässler, 1835)
- Species Arianta xatartii (Farines, 1834)
- Genus Arionta E. von Martens, 1860 accepted as Arianta W. Turton, 1831
- Genus Botteria Brusina, 1904 accepted as Liburnica Kobelt, 1904
- Genus Campylaea H. Beck, 1837 (10)
- Genus Campylaeopsis A. J. Wagner, 1914 (1)
- Genus Cattania Brusina, 1904 (19)
- Genus Causa Schileyko, 1971 (1)
- Genus Chilostoma Fitzinger, 1833 (9)
- Genus Chilotrema W. Turton, 1831 accepted as Helicigona A. Férussac, 1821
- Genus Cochlopupa Jan, 1830 accepted as Cylindrus Fitzinger, 1833
- Genus Corneola Held, 1838 (4)
- Genus Cylindrus Fitzinger, 1833 (1)
- Genus Delphinatia P. Hesse, 1931 (2)
- Genus Dinarica Kobelt, 1902 (4)
- Genus Drobacia Brusina, 1904 (2)
- Genus Eucampylaea Westerlund, 1876 accepted as Campylaea H. Beck, 1837
- Genus Faustina Kobelt, 1904 (6)
- Genus Hazaya Soós, 1908 accepted as Vidovicia Brusina, 1904
- Genus Helicigona A. Férussac, 1821 (7)
- Genus Isognomostoma Fitzinger, 1833 (1)
- Genus Josephinella F. Haas, 1936 (17)
- Genus Kollarix Groenenberg, Subai & E. Gittenberger, 2016 (1)
- Genus Kosicia Brusina, 1904 (3)
- Genus Latomus Fitzinger, 1833 accepted as Helicigona A. Férussac, 1821
- Genus Lenticula Held, 1838 accepted as Helicigona A. Férussac, 1821
- Genus Liburnica Kobelt, 1904 (18)
- Genus Mesodontopsis Pilsbry, 1895 † (6)
- Genus Metacampylaea Pilsbry, 1895 † (2)
- Genus Paradrobacia H. Nordsieck, 2014 † (6)
- Genus Partschia C. R. Boettger, 1911 accepted as Drobacia Brusina, 1904
- Genus Plicostoma Schlüter, 1838 accepted as Isognomostoma Fitzinger, 1833
- Genus Pseudoklikia H. Nordsieck, 2018 † (1)
- Genus Pseudotrizona Groenenberg, Subai & E. Gittenberger, 2016
- Genus Superba Subai & Fehér, 2006 accepted as Liburnica (Superba) Subai & Fehér, 2006
- Genus Thiessea Kobelt, 1904 (16)
- Genus Vidovicia Brusina, 1904 (1)
- Genus Wladislawia A. J. Wagner, 1928 accepted as Cattania Brusina, 1904
- Subfamily Helicinae Rafinesque, 1815 (321)
- Subfamily Murellinae P. Hesse, 1918 (25)
- Tribe Clausiliana J. E. Gray, 1855 accepted as Clausiliidae J. E. Gray, 1855
- Genus Cingulifera Held, 1838 accepted as Chilostoma (Cingulifera) Held, 1838
- Genus Nanhaispira W. Yü & X.-Q. Zhang, 1982 † (1)
- Genus Pachytachea Pfeffer, 1930 † accepted as Palaeotachea Jooss, 1912 †
- Genus Praecampylaea Pfeffer, 1930 † (1)
- Genus Procampylaea Gaál, 1910 † accepted as Pseudochloritis C. R. Boettger, 1909 †
- 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 (462)
- 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)
- Tribe Canariellini Schileyko, 1991 accepted as Canariellidae Schileyko, 1991
- Genus Laxecostula Harzhauser & Neubauer, 2020 † (1)
- Superfamily Sagdoidea Pilsbry, 1895 (200)
- Infraorder Limacoidei (4 247)
- Infraorder Oleacinoidei (497)
- Infraorder Orthalicoidei (1 587)
- Infraorder Partuloinei accepted as Pupilloidei
- Infraorder Pupilloidei (3 466)
- Infraorder Rhytidoidei (580)
- 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 (2 008)
- Superorder Pneumopulmonata
- Superorder Pylopulmonata (4 284)
- 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 (1 915)
- Subclass Orthogastropoda represented as Gastropoda
- Subclass Patellogastropoda (514)
- Subclass Prosobranchia
- Subclass Psilogastropoda represented as Gastropoda
- Subclass Vetigastropoda (6 788)
- 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 (1 381)
- Class Polyplaxiphora accepted as Polyplacophora
- Class Rostroconchia † (64)
- Class Scaphopoda (753)
- Class Solenoconchia accepted as Scaphopoda
- Class Solenogastres (313)
- Subclass Chaetodermomorpha accepted as Caudofoveata