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)
- Subfamily Archaicinae Schileyko, 1978 accepted as Archaicini Schileyko, 1978
- Subfamily Euomphaliinae Schileyko, 1978 accepted as Monachaini Wenz, 1930 (1904)
- Subfamily Hygromiinae Tryon, 1866 (32)
- Subfamily Leptaxinae C. R. Boettger, 1909 (34)
- Subfamily Metafruticicolinae Schileyko, 1972 (31)
- Genus Cretigena Schileyko, 1972 accepted as Metafruticicola (Cretigena) Schileyko, 1972
- Genus Cyrnotheba Germain, 1928 (1)
- Genus Elbasania Schileyko & Fehér, 2017 (1)
- Genus Hiltrudia H. Nordsieck, 1993 (3)
- Genus Latonia Westerlund, 1889 accepted as Metafruticicola (Westerlundia) Kobelt, 1904
- Genus Metafruticicola Ihering, 1892 (26)
- Subgenus Metafruticicola (Caucasocressa) P. Hesse, 1921 accepted as Caucasocressa P. Hesse, 1921
- Subgenus Metafruticicola (Cretigena) Schileyko, 1972 represented as Metafruticicola Ihering, 1892
- Subgenus Metafruticicola (Elbasania) Schileyko & Fehér, 2017 accepted as Elbasania Schileyko & Fehér, 2017
- Subgenus Metafruticicola (Metafruticicola) Ihering, 1892 represented as Metafruticicola Ihering, 1892
- Subgenus Metafruticicola (Rothifruticicola) Bank, E. Gittenberger & Neubert, 2013 represented as Metafruticicola Ihering, 1892
- Subgenus Metafruticicola (Westerlundia) Kobelt, 1904 represented as Metafruticicola Ihering, 1892
- Species Metafruticicola (Westerlundia) andria (E. von Martens, 1889) represented as Metafruticicola andria (E. von Martens, 1889)
- Species Metafruticicola (Westerlundia) berytensis (L. Pfeiffer, 1841) represented as Metafruticicola berytensis (L. Pfeiffer, 1841)
- Species Metafruticicola (Westerlundia) coartata A. Fuchs & Käufel, 1936 represented as Metafruticicola coartata A. Fuchs & Käufel, 1936
- Species Metafruticicola (Westerlundia) genezarethana (Mousson, 1861) represented as Metafruticicola genezarethana (Mousson, 1861)
- Species Metafruticicola (Westerlundia) hermonensis Forcart, 1981 represented as Metafruticicola hermonensis Forcart, 1981
- Species Metafruticicola (Westerlundia) naxiana (A. Férussac, 1832) represented as Metafruticicola naxiana (A. Férussac, 1832)
- Species Metafruticicola (Westerlundia) noverca (L. Pfeiffer, 1853) represented as Metafruticicola noverca (L. Pfeiffer, 1853)
- Species Metafruticicola (Westerlundia) occidentalis Subai, 1999 accepted as Elbasania occidentalis (Subai, 1999)
- Species Metafruticicola andria (E. von Martens, 1889)
- Species Metafruticicola berytensis (L. Pfeiffer, 1841)
- Species Metafruticicola coartata A. Fuchs & Käufel, 1936
- Species Metafruticicola crassicosta Bank, E. Gittenberger & Neubert, 2013
- Species Metafruticicola dedegoelensis Hausdorf, Gümüş & Yıldırım, 2004
- Species Metafruticicola delabris (Mousson, 1863) accepted as Caucasocressa joannis (Mortillet, 1854)
- Species Metafruticicola dictaea (E. von Martens, 1889)
- Species Metafruticicola diva Örstan & Yıldırım, 2022
- Species Metafruticicola genezarethana (Mousson, 1861)
- Species Metafruticicola giurica (O. Boettger, 1892) accepted as Metafruticicola noverca (L. Pfeiffer, 1853)
- Species Metafruticicola grelloisii (Bourguignat, 1857) accepted as Metafruticicola redtenbacheri (L. Pfeiffer, 1856)
- Species Metafruticicola hermonensis Forcart, 1981
- Species Metafruticicola hikmeti Hudec, 1971 accepted as Metafruticicola schuberti (J. R. Roth, 1839)
- Species Metafruticicola kavafis Bitzilekis, Vardinoyannis & Mylonas, 2023
- Species Metafruticicola kizildagensis Gümüş & Neubert, 2012
- Species Metafruticicola monticola Bank, E. Gittenberger & Neubert, 2013
- Species Metafruticicola naxiana (A. Férussac, 1832)
- Species Metafruticicola nicosiana (Mousson, 1854)
- Species Metafruticicola noverca (L. Pfeiffer, 1853)
- Species Metafruticicola occidentalis Subai, 1999 accepted as Elbasania occidentalis (Subai, 1999)
- Species Metafruticicola oerstani Hausdorf, Gümüş & Yıldırım, 2004
- Species Metafruticicola ottmari Falkner, 2013
- Species Metafruticicola pellita (A. Férussac, 1832)
- Species Metafruticicola pieperi Bank, E. Gittenberger & Neubert, 2013
- Species Metafruticicola pratensis (L. Pfeiffer, 1846) accepted as Hesseola pratensis (L. Pfeiffer, 1846)
- Species Metafruticicola redtenbacheri (L. Pfeiffer, 1856)
- Species Metafruticicola rugosissima Bank, E. Gittenberger & Neubert, 2013
- Species Metafruticicola saninensis Pallary, 1939 accepted as Monacha saninensis (Pallary, 1939)
- Species Metafruticicola schuberti (J. R. Roth, 1839)
- Species Metafruticicola sublecta (Maltzan, 1884)
- Species Metafruticicola uluborluensis Bank, E. Gittenberger & Neubert, 2013
- Species Metafruticicola yatagana Schütt, 1985 †
- Species Metafruticicola zonella (L. Pfeiffer, 1865)
- Subfamily Paedhoplitinae Schileyko, 1978 accepted as Archaicini Schileyko, 1978
- Subfamily Trochulininae Lindholm, 1927 (332)
- Genus Archygromia Pfeffer, 1930 † (3)
- Genus Cernuellopsis Manganelli & Fo. Giusti, 1988 (1)
- Genus Helicotricha Fo. Giusti, Manganelli & Crisci, 1992 (1)
- Genus Hemistenotrema O. Boettger, 1897 † (1)
- Genus Hochheimia Harzhauser & Neubauer, 2021 † (1)
- Genus Ichnusomunda Fo. Giusti & Manganelli, 1998 (2)
- Genus Jacosta J. E. Gray, 1821 accepted as Xerosecta Monterosato, 1892
- Genus Leucochroopsis O. Boettger, 1908 † (14)
- Genus Loganiopharynx Wenz, 1919 † (3)
- Genus Numidia Issel, 1885 accepted as Xeroplana Monterosato, 1892
- Genus Pseudomonacha Pfeffer, 1930 † (3)
- Genus Pseudoxerotricha C. R. Boettger, 1911 † (2)
- Genus Trochulinae Lindholm, 1927 accepted as Trochulininae Lindholm, 1927
- Genus Xerofalsa Monterosato, 1892 accepted as Xeroplana Monterosato, 1892
- 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
