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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)
- Subfamily Geomitrinae C. R. Boettger, 1909 (144)
- Subfamily Helicellinae Ihering, 1909 (257)
- Tribe Cernuellini Schileyko, 1991 (40)
- Tribe Helicellini Ihering, 1909 (74)
- Tribe Helicopsini H. Nordsieck, 1987 (49)
- Tribe Plentuisini Razkin, Gómez-Moliner, Prieto, Martínez-Ortí, Arrébola, Muñoz, Chueca & Madeira, 2015 (1)
- Tribe Trochoideini H. Nordsieck, 1987 (87)
- Genus Ereminella Pallary, 1919 accepted as Xerocrassa Monterosato, 1892
- Genus Heldia P. Hesse, 1926 accepted as Xerocrassa Monterosato, 1892
- Genus Ochthephila H. Beck, 1837 accepted as Trochoidea T. Brown, 1827
- Genus Trochoidea T. Brown, 1827 (11)
- Genus Trochula Schlüter, 1838 accepted as Trochoidea T. Brown, 1827
- Genus Tropidocochlis Locard, 1893 accepted as Xerosecta Monterosato, 1892
- Genus Turricula H. Beck, 1837 accepted as Trochoidea T. Brown, 1827
- Genus Xerocauta Monterosato, 1892 accepted as Xerocrassa Monterosato, 1892
- Genus Xeroclausa Monterosato, 1892 accepted as Trochoidea (Xeroclausa) Monterosato, 1892
- Genus Xeroclivia Monterosato, 1892 accepted as Trochoidea T. Brown, 1827
- Genus Xerocochlea Monterosato, 1892 accepted as Trochoidea T. Brown, 1827
- Genus Xerocrassa Monterosato, 1892 (76)
- Subgenus Xerocrassa (Amandana) Fagot, 1891 represented as Xerocrassa Monterosato, 1892
- Subgenus Xerocrassa (Xerobarcana) R. A. Brandt, 1959 accepted as Xerocrassa Monterosato, 1892
- Subgenus Xerocrassa (Xeroclausa) Monterosato, 1892 represented as Xerocrassa Monterosato, 1892
- Subgenus Xerocrassa (Xerocrassa) Monterosato, 1892 represented as Xerocrassa Monterosato, 1892
- Species Xerocrassa (Xerocrassa) amphiconus (Maltzan, 1883) represented as Xerocrassa amphiconus (Maltzan, 1883)
- Species Xerocrassa (Xerocrassa) berenice represented as Xerocrassa berenice (Kobelt, 1883)
- Species Xerocrassa (Xerocrassa) carinatoglobosa (F. Haas, 1934) represented as Xerocrassa carinatoglobosa (F. Haas, 1934)
- Species Xerocrassa (Xerocrassa) claudia Hausdorf & Welter-Schultes, 1998 represented as Xerocrassa claudia Hausdorf & Welter-Schultes, 1998
- Species Xerocrassa (Xerocrassa) claudiconus Hausdorf & Welter-Schultes, 1998 represented as Xerocrassa claudiconus Hausdorf & Welter-Schultes, 1998
- Species Xerocrassa (Xerocrassa) cretica (L. Pfeiffer, 1841) represented as Xerocrassa cretica (L. Pfeiffer, 1841)
- Species Xerocrassa (Xerocrassa) davidiana (Bourguignat, 1864) represented as Xerocrassa davidiana (Bourguignat, 1864)
- Species Xerocrassa (Xerocrassa) diensis (Maltzan, 1883) represented as Xerocrassa diensis (Maltzan, 1883)
- Species Xerocrassa (Xerocrassa) elevata (Pallary, 1924) represented as Xerocrassa elevata (Pallary, 1924)
- Species Xerocrassa (Xerocrassa) eremophila (L. Pfeiffer, 1853) represented as Xerocrassa eremophila (L. Pfeiffer, 1853)
- Species Xerocrassa (Xerocrassa) erkelii (Kobelt, 1878) represented as Xerocrassa erkelii (Kobelt, 1878)
- Species Xerocrassa (Xerocrassa) fourtaui (Pallary, 1902) represented as Xerocrassa fourtaui (Pallary, 1902)
- Species Xerocrassa (Xerocrassa) franciscoi Hausdorf & Sauer, 2009 represented as Xerocrassa franciscoi Hausdorf & Sauer, 2009
- Species Xerocrassa (Xerocrassa) grabusana Hausdorf & Sauer, 2009 represented as Xerocrassa grabusana Hausdorf & Sauer, 2009
- Species Xerocrassa (Xerocrassa) helleri (Forcart, 1976) represented as Xerocrassa helleri (Forcart, 1976)
- Species Xerocrassa (Xerocrassa) heraklea Hausdorf & Sauer, 2009 represented as Xerocrassa heraklea Hausdorf & Sauer, 2009
- Species Xerocrassa (Xerocrassa) huggani R. Brandt, 1959 represented as Xerocrassa huggani R. Brandt, 1959
- Species Xerocrassa (Xerocrassa) kydonia Hausdorf & Sauer, 2009 represented as Xerocrassa kydonia Hausdorf & Sauer, 2009
- Species Xerocrassa (Xerocrassa) lacertara (Bourguignat, 1863) represented as Xerocrassa lacertara (Bourguignat, 1863)
- Species Xerocrassa (Xerocrassa) langloisiana (Bourguignat, 1853) represented as Xerocrassa langloisiana (Bourguignat, 1853)
- Species Xerocrassa (Xerocrassa) lasithiensis Hausdorf & Sauer, 2009 represented as Xerocrassa lasithiensis Hausdorf & Sauer, 2009
- Species Xerocrassa (Xerocrassa) latastei (A. Letourneux, 1887) represented as Xerocrassa latastei (A. Letourneux, 1887)
- Species Xerocrassa (Xerocrassa) latasteopsis (A. Letourneux & Bourguignat, 1887) represented as Xerocrassa latasteopsis (A. Letourneux & Bourguignat, 1887)
- Species Xerocrassa (Xerocrassa) mesostena (Westerlund, 1879) represented as Xerocrassa mesostena (Westerlund, 1879)
- Species Xerocrassa (Xerocrassa) mienisi (Forcart, 1976) represented as Xerocrassa mienisi (Forcart, 1976)
- Species Xerocrassa (Xerocrassa) naisi (Pallary, 1939) represented as Xerocrassa naisi (Pallary, 1939)
- Species Xerocrassa (Xerocrassa) nicosiana (E. Gittenberger, 1991) represented as Xerocrassa nicosiana (E. Gittenberger, 1991)
- Species Xerocrassa (Xerocrassa) picardi (F. Haas, 1933) represented as Xerocrassa picardi (F. Haas, 1933)
- Species Xerocrassa (Xerocrassa) pilsbryi Forcart, 1976 represented as Xerocrassa pilsbryi Forcart, 1976
- Species Xerocrassa (Xerocrassa) poecilodoma (O. Boettger, 1894) represented as Xerocrassa poecilodoma (O. Boettger, 1894)
- Species Xerocrassa (Xerocrassa) pseudojacosta (Forcart, 1976) represented as Xerocrassa pseudojacosta (Forcart, 1976)
- Species Xerocrassa (Xerocrassa) rhabdota (Sturany, 1901) represented as Xerocrassa rhabdota (Sturany, 1901)
- Species Xerocrassa (Xerocrassa) rhithymna Hausdorf & Sauer, 2009 represented as Xerocrassa rhithymna Hausdorf & Sauer, 2009
- Species Xerocrassa (Xerocrassa) scharonica (F. Haas, 1936) represented as Xerocrassa scharonica (F. Haas, 1936)
- Species Xerocrassa (Xerocrassa) seetzeni (L. Pfeiffer, 1847) represented as Xerocrassa seetzeni (L. Pfeiffer, 1847)
- Species Xerocrassa (Xerocrassa) siderensis (Maltzan, 1883) represented as Xerocrassa siderensis (Maltzan, 1883)
- Species Xerocrassa (Xerocrassa) simulata (Ehrenberg, 1831) represented as Xerocrassa simulata (Ehrenberg, 1831)
- Species Xerocrassa (Xerocrassa) sinaica (E. von Martens, 1889) represented as Xerocrassa sinaica (E. von Martens, 1889)
- Species Xerocrassa (Xerocrassa) subvariegata (Maltzan, 1883) represented as Xerocrassa subvariegata (Maltzan, 1883)
- Species Xerocrassa (Xerocrassa) tuberculosa (Conrad, 1852) represented as Xerocrassa tuberculosa (Conrad, 1852)
- Species Xerocrassa (Xerocrassa) zilchi (Forcart, 1976) represented as Xerocrassa zilchi (Forcart, 1976)
- Species Xerocrassa amphiconus (Maltzan, 1883)
- Species Xerocrassa arturi (F. Haas, 1924) accepted as Xerocrassa ripacurcica ripacurcica (Bofill, 1886)
- Species Xerocrassa barceloi (Hidalgo, 1878)
- Species Xerocrassa berenice (Kobelt, 1883)
- Species Xerocrassa cardonae (Hidalgo, 1867) accepted as Xerocrassa nyeli (Mittre, 1842)
- Species Xerocrassa carinatoglobosa (F. Haas, 1934)
- Species Xerocrassa caroli (Dohrn & Heynemann, 1862)
- Species Xerocrassa chiae (Fagot, 1886)
- Species Xerocrassa cisternasi (Hidalgo, 1883)
- Species Xerocrassa claudia Hausdorf & Welter-Schultes, 1998
- Species Xerocrassa claudiconus Hausdorf & Welter-Schultes, 1998
- Species Xerocrassa claudinae (Gasull, 1964)
- Species Xerocrassa cobosi (Ortiz de Zárate López, 1962)
- Species Xerocrassa commeata (Mousson, 1874)
- Species Xerocrassa cremnophila (Charpentier, 1847) accepted as Xerocrassa eremophila (L. Pfeiffer, 1853)
- Species Xerocrassa cretica (L. Pfeiffer, 1841)
- Species Xerocrassa davidiana (Bourguignat, 1864)
- Species Xerocrassa derogata (Rossmässler, 1854)
- Species Xerocrassa diensis (Maltzan, 1883)
- Species Xerocrassa ebusitana (Hidalgo, 1869)
- Species Xerocrassa edmundi Martínez-Ortí, 2006
- Species Xerocrassa elevata (Pallary, 1924)
- Species Xerocrassa eremophila (L. Pfeiffer, 1853)
- Species Xerocrassa erkelii (Kobelt, 1878)
- Species Xerocrassa ferreri (Jaeckel, 1952) accepted as Xerocrassa newka (Dohrn & Heynemann, 1862)
- Species Xerocrassa formenterensis (F. Schröder, 1984)
- Species Xerocrassa fourtaui (Pallary, 1902)
- Species Xerocrassa franciscoi Hausdorf & Sauer, 2009
- Species Xerocrassa frater (Dohrn & Heynemann, 1862)
- Species Xerocrassa geyeri (Soós, 1926)
- Species Xerocrassa gharlapsi (Beckmann, 1987)
- Species Xerocrassa grabusana Hausdorf & Sauer, 2009
- Species Xerocrassa grata (F. Haas, 1924)
- Species Xerocrassa helleri (Forcart, 1976)
- Species Xerocrassa heraklea Hausdorf & Sauer, 2009
- Species Xerocrassa homeyeri (Dohrn & Heynemann, 1862)
- Species Xerocrassa huggani R. Brandt, 1959
- Species Xerocrassa jimenensis (Puente & Arrébola, 1996)
- Species Xerocrassa kydonia Hausdorf & Sauer, 2009
- Species Xerocrassa lacertara (Bourguignat, 1863)
- Species Xerocrassa lacipensis Torres Alba & Quintana Cardona, 2021
- Species Xerocrassa langloisiana (Bourguignat, 1853)
- Species Xerocrassa lasithiensis Hausdorf & Sauer, 2009
- Species Xerocrassa latastei (A. Letourneux, 1887)
- Species Xerocrassa latasteopsis (A. Letourneux & Bourguignat, 1887)
- Species Xerocrassa libyca (Kobelt, 1883)
- Species Xerocrassa madritensis (Rambur, 1868) accepted as Xerotricha madritensis (Rambur, 1868)
- Species Xerocrassa meda (Porro, 1840)
- Species Xerocrassa mesostena (Westerlund, 1879)
- Species Xerocrassa mienisi (Forcart, 1976)
- Species Xerocrassa molinae (Hidalgo, 1883)
- Species Xerocrassa montserratensis (Hidalgo, 1870)
- Species Xerocrassa moraguesi (Kobelt, 1883) accepted as Xerocrassa homeyeri homeyeri (Dohrn & Heynemann, 1862)
- Species Xerocrassa naisi (Pallary, 1939)
- Species Xerocrassa newka (Dohrn & Heynemann, 1862)
- Species Xerocrassa nicosiana (E. Gittenberger, 1991)
- Species Xerocrassa nyeli (Mittre, 1842)
- Species Xerocrassa pallaresica (Fagot, 1886) accepted as Xerocrassa madritensis (Rambur, 1868)
- Species Xerocrassa penalveri Martinez-Orti, 2022
- Species Xerocrassa penchinati (Bourguignat, 1868)
- Species Xerocrassa philamnia (Bourguignat, 1863)
- Species Xerocrassa picardi (F. Haas, 1933)
- Species Xerocrassa pilsbryi Forcart, 1976
- Species Xerocrassa poecilodoma (O. Boettger, 1894)
- Species Xerocrassa pollenzensis (Hidalgo, 1878)
- Species Xerocrassa prietoi (Hidalgo, 1878) accepted as Xerocrassa homeyeri homeyeri (Dohrn & Heynemann, 1862)
- Species Xerocrassa pseudojacosta (Forcart, 1976)
- Species Xerocrassa regimaensis R. Brandt, 1959
- Species Xerocrassa rhabdota (Sturany, 1901)
- Species Xerocrassa rhithymna Hausdorf & Sauer, 2009
- Species Xerocrassa ripacurcica (Bofill, 1886)
- Species Xerocrassa roblesi (Martínez-Ortí, 2000)
- Species Xerocrassa salvanae (Fagot, 1886) accepted as Xerotricha madritensis (Rambur, 1868)
- Species Xerocrassa scharonica (F. Haas, 1936)
- Species Xerocrassa seetzeni (L. Pfeiffer, 1847)
- Species Xerocrassa siderensis (Maltzan, 1883)
- Species Xerocrassa simulata (Ehrenberg, 1831)
- Species Xerocrassa sinaica (E. von Martens, 1889)
- Species Xerocrassa siphnica (Kobelt, 1883)
- Species Xerocrassa subrogata (L. Pfeiffer, 1853)
- Species Xerocrassa subvariegata (Maltzan, 1883)
- Species Xerocrassa tuberculosa (Conrad, 1852)
- Species Xerocrassa turolensis (Ortiz de Zárate López, 1963)
- Species Xerocrassa zaharensis (Puente & Arrébola, 1996)
- Species Xerocrassa zilchi (Forcart, 1976)
- Species Xerocrassa zviae Mienis, 2017
- Genus Xeronexa Monterosato, 1892 accepted as Trochoidea T. Brown, 1827
- Genus Xeroptyca Monterosato, 1892 accepted as Xerocrassa Monterosato, 1892
- Genus Kalitinaia Hudec & Lezhawa, 1967 (6)
- Subfamily Ochthephilinae Zilch, 1960 accepted as Geomitrini C. R. Boettger, 1909
- Genus Heliomanes [sic] accepted as Helicella A. Férussac, 1821
- Genus Peridotitea Torres Alba, D. T. Holyoak, G. A. Holyoak, Vázquez Toro & Ripoll, 2018 (1)
- 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)
- 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
