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)
- Subfamily Ariantinae Mörch, 1864 (153)
- Subfamily Helicinae Rafinesque, 1815 (320)
- Tribe Allognathini Westerlund, 1903 (95)
- Tribe Ereminini D. T. Holyoak, G. A. Holyoak, Gómez-Moliner & Chueca, 2020 accepted as Thebini Wenz, 1923
- Tribe Helicini Rafinesque, 1815 (98)
- Tribe Maculariini Neiber, Korábek, Glaubrecht & Hausdorf, 2021 (3)
- Tribe Otalini G. Pfeffer, 1930 accepted as Thebini Wenz, 1923
- Tribe Thebini Wenz, 1923 (74)
- Genus Alabastrina Kobelt, 1904 accepted as Loxana Pallary, 1899 (1)
- Genus Archelix Albers, 1850 accepted as Otala Schumacher, 1817
- Genus Atlasica Pallary, 1917 accepted as Loxana Pallary, 1899
- Genus Beaumieriana Pallary, 1926 accepted as Loxana Pallary, 1899
- Genus Cantarelus Pallary, 1929 accepted as Cantareus Risso, 1826
- Genus Cantareus Risso, 1826 (3)
- Genus Cornu Born, 1778 (5)
- Genus Cryptomphalus Charpentier, 1837 accepted as Cornu Born, 1778
- Genus Eobania P. Hesse, 1913 (5)
- Genus Erctella Monterosato, 1894 accepted as Cornu (Erctella) Monterosato, 1894
- Genus Eremia [sic] accepted as Eremina L. Pfeiffer, 1855
- Genus Eremina L. Pfeiffer, 1855 (10)
- Genus Eremiopsis C. R. Boettger, 1909 accepted as Eremina L. Pfeiffer, 1855
- Genus Eremophila Kobelt, 1871 accepted as Eremina L. Pfeiffer, 1855
- Genus Euparypha W. Hartmann, 1843 accepted as Theba Risso, 1826
- Species Euparypha cartaxensis (Roman, 1907) † accepted as Theba cartaxensis (Roman, 1907) †
- Species Euparypha comaliana (Bourguignat, 1882) accepted as Eremina desertella (Jickeli, 1872)
- Species Euparypha dehnei (Pallary, 1922) accepted as Theba subdentata dehnei (Rossmässler, 1846)
- Variety Euparypha dehnei var. bicolor Pallary, 1922 accepted as Theba subdentata dehnei (Rossmässler, 1846)
- Variety Euparypha dehnei var. depressa Pallary, 1922 accepted as Theba subdentata dehnei (Rossmässler, 1846)
- Variety Euparypha dehnei var. lineolata Pallary, 1922 accepted as Theba subdentata dehnei (Rossmässler, 1846)
- Variety Euparypha dehnei var. minor Pallary, 1922 accepted as Theba subdentata dehnei (Rossmässler, 1846)
- Variety Euparypha dehnei var. turgida Pallary, 1915 accepted as Theba subdentata subdentata (A. Férussac, 1821)
- Species Euparypha pisana (O. F. Müller, 1774) accepted as Theba pisana (O. F. Müller, 1774)
- Species Euparypha planata (A. Férussac, 1821) accepted as Theba subdentata helicella (W. Wood, 1828)
- Species Euparypha quintanellensis (Roman, 1907) † accepted as Theba quintanellensis (Roman, 1907) †
- Species Euparypha subdentata (A. Férussac, 1821) accepted as Theba subdentata (A. Férussac, 1821)
- Genus Exiliberus Iredale, 1942 accepted as Eremina L. Pfeiffer, 1855
- Genus Gaetulia Kobelt, 1898 accepted as Maurohelix P. Hesse, 1917
- Genus Gyrostoma P. Hesse, 1909 accepted as Gyrostomella P. Hesse, 1911
- Genus Gyrostomella P. Hesse, 1911 (3)
- Genus Hessea C. R. Boettger, 1911 accepted as Eremina L. Pfeiffer, 1855
- Genus Lechatelieria Pallary, 1926 accepted as Loxana Pallary, 1899
- Genus Leucochroa Beck, 1837 accepted as Theba Risso, 1826
- Genus Loxana Pallary, 1899 (7)
- Genus Massylaea Möllendorff, 1898 (3)
- Genus Maurohelix P. Hesse, 1917 accepted as Gyrostomella (Maurohelix) P. Hesse, 1917
- Genus Otala Schumacher, 1817 (15)
- Genus Pachydupotetia Pfeffer, 1930 † accepted as Otala (Dupotetia) Kobelt, 1904
- Genus Platyotala Pfeffer, 1930 † accepted as Massylaea Möllendorff, 1898
- Genus Rossmaessleria P. Hesse, 1907 (3)
- Genus Tapada J. E. Gray, 1840 accepted as Cantareus Risso, 1826
- Genus Theba Risso, 1826 (19)
- Genus Tingitana Pallary, 1919 accepted as Otala Schumacher, 1817
- Genus Wiegmannia P. Hesse, 1916 accepted as Maurohelix P. Hesse, 1917
- Genus Xerophila Held, 1838 accepted as Theba Risso, 1826
- Genus Creneatachea Zilch, 1960 † (1)
- Genus Frechenia Schlickum & Strauch, 1971 † (6)
- Genus Holcotachea Pfeffer, 1930 † accepted as Megalotachea Pfeffer, 1930 †
- Genus Megalotachea Pfeffer, 1930 † (14)
- Genus Mesotachea Pfeffer, 1930 † accepted as Palaeotachea Jooss, 1912 †
- Genus Metachloraea Pfeffer, 1930 † accepted as Parachloraea F. Sandberger, 1873 †
- Genus Odontotachea Pfeffer, 1930 † accepted as Palaeotachea Jooss, 1912 †
- Genus Palaeotachea Jooss, 1912 † (14)
- Genus Parachloraea F. Sandberger, 1873 † (11)
- Genus Schlickumia Truc, 1971 † (3)
- Genus Titthodomus Pfeffer, 1930 † (1)
- Genus Trachytachea Pfeffer, 1930 † accepted as Megalotachea Pfeffer, 1930 †
- 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 (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)
- 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