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)
- Superfamily Clausilioidea J. E. Gray, 1855 (1 859)
- Family Clausiliidae J. E. Gray, 1855 (1 762)
- Subfamily Alopiinae A. J. Wagner, 1913 (434)
- Tribe Alopiini A. J. Wagner, 1913 (103)
- Tribe Cochlodinini Lindholm, 1925 (1923) (42)
- Tribe Delimini R. Brandt, 1956 (62)
- Genus Adriaca Westerlund, 1884 accepted as Delima (Semirugata) O. Boettger, 1877
- Genus Alpidelima A. J. Wagner, 1924 accepted as Charpentieria Stabile, 1864
- Genus Barcania R. Brandt, 1956 (8)
- Genus Benoitiella Sparacio, Liberto, Reitano, R. Viviano & De Mattia, 2025 (1)
- Genus Binodata O. Boettger, 1877 accepted as Delima W. Hartmann, 1842
- Genus Charpentieria Stabile, 1864 (4)
- Subgenus Charpentieria (Charpentieria) Stabile, 1864 represented as Charpentieria Stabile, 1864
- Subgenus Charpentieria (Dilataria) Vest, 1867 accepted as Dilataria Vest, 1867
- Subgenus Charpentieria (Gibbularia) Cecconi, 1908 accepted as Gibbularia Cecconi, 1908
- Subgenus Charpentieria (Itala) O. Boettger, 1877 accepted as Charpentieria Stabile, 1864
- Subgenus Charpentieria (Mauritanica) O. Boettger, 1879 accepted as Mauritanica O. Boettger, 1879
- Subgenus Charpentieria (Siciliaria) Vest, 1867 accepted as Siciliaria Vest, 1867
- Subgenus Charpentieria (Stigmatica) O. Boettger, 1877 accepted as Stigmatica O. Boettger, 1877
- Species Charpentieria calcarae (R. A. Philippi, 1844) accepted as Siciliaria calcarae (R. A. Philippi, 1844)
- Species Charpentieria clavata (Rossmässler, 1836) accepted as Charpentieria itala clavata (Rossmässler, 1836)
- Species Charpentieria crassicostata (L. Pfeiffer, 1856) accepted as Sicania crassicostata (L. Pfeiffer, 1856)
- Species Charpentieria dyodon (S. Studer, 1820)
- Species Charpentieria eminens (A. Schmidt, 1868) accepted as Sicania eminens (A. Schmidt, 1868)
- Species Charpentieria ernae (Fauer, 1978) accepted as Stigmatica ernae (Fauer, 1978)
- Species Charpentieria ferrox (R. A. Brandt, 1961) accepted as Siciliaria ferrox R. A. Brandt, 1961
- Species Charpentieria gibbula (Rossmässler, 1836) accepted as Gibbularia gibbula (Rossmässler, 1836)
- Subspecies Charpentieria gibbula gibbula (Rossmässler, 1836) accepted as Gibbularia gibbula gibbula (Rossmässler, 1836)
- Subspecies Charpentieria gibbula honii (Tiberi, 1878) accepted as Gibbularia gibbula honii (Tiberi, 1878)
- Subspecies Charpentieria gibbula multiplex (Westerlund, 1884) accepted as Gibbularia gibbula multiplex (Westerlund, 1884)
- Subspecies Charpentieria gibbula niethammeri (B. Rensch, 1934) accepted as Gibbularia gibbula niethammeri (B. Rensch, 1934)
- Subspecies Charpentieria gibbula pelagosana (O. Boettger, 1877) accepted as Gibbularia gibbula pelagosana (O. Boettger, 1877)
- Subspecies Charpentieria gibbula sanctangeli (A. J. Wagner, 1925) accepted as Gibbularia gibbula sanctangeli (A. J. Wagner, 1925)
- Subspecies Charpentieria gibbula selecta (Monterosato, 1908) accepted as Gibbularia gibbula selecta (Monterosato, 1908)
- Species Charpentieria grohmanniana (Rossmässler, 1836) accepted as Siciliaria grohmanniana (Rossmässler, 1836)
- Species Charpentieria incerta (Küster, 1861) accepted as Stigmatica incerta (Küster, 1861)
- Species Charpentieria itala (G. von Martens, 1824)
- Species Charpentieria kobeltiana (Küster, 1876) accepted as Stigmatica kobeltiana (Küster, 1876)
- Species Charpentieria lamellata (Rossmässler, 1836) accepted as Stigmatica lamellata (Rossmässler, 1836)
- Species Charpentieria leucophryna (L. Pfeiffer, 1862) accepted as Siciliaria leucophryna (L. Pfeiffer, 1862)
- Species Charpentieria nobilis (L. Pfeiffer, 1848) accepted as Sicania nobilis (L. Pfeiffer, 1848)
- Species Charpentieria ornata (Rossmässler, 1836)
- Species Charpentieria paestana (R. A. Philippi, 1836) accepted as Stigmatica paestana (R. A. Philippi, 1836)
- Species Charpentieria pantocratoris (O. Boettger, 1889) accepted as Stigmatica pantocratoris (O. Boettger, 1889)
- Species Charpentieria perforata (O. Boettger, 1877) † accepted as Cochlodina (Miophaedusa) perforata (O. Boettger, 1877) †
- Species Charpentieria piceata (Rossmässler, 1836) accepted as Stigmatica piceata (Rossmässler, 1836)
- Species Charpentieria riberothi (R. A. Brandt, 1961) accepted as Siciliaria riberothi R. A. Brandt, 1961
- Species Charpentieria scarificata (L. Pfeiffer, 1856) accepted as Mauritanica scarificata (L. Pfeiffer, 1856)
- Species Charpentieria septemplicata (R. A. Philippi, 1836) accepted as Siciliaria septemplicata (R. A. Philippi, 1836)
- Species Charpentieria spezialensis (H. Nordsieck, 1984) accepted as Sicania nobilis spezialensis (H. Nordsieck, 1984)
- Species Charpentieria splendens (H. Nordsieck, 1996) accepted as Stigmatica pantocratoris splendens (H. Nordsieck, 1996)
- Species Charpentieria stenzii (Rossmässler, 1836)
- Species Charpentieria stigmatica (Rossmässler, 1836) accepted as Stigmatica stigmatica (Rossmässler, 1836)
- Species Charpentieria tiberii (A. Schmidt, 1868) accepted as Siciliaria tiberii (A. Schmidt, 1868)
- Species Charpentieria vulcanica (Benoit, 1860) accepted as Stigmatica vulcanica (Benoit, 1881)
- Genus Dalmatica O. Boettger, 1877 accepted as Delima W. Hartmann, 1842
- Genus Delima W. Hartmann, 1842 (18)
- Genus Dilataria Vest, 1867 (5)
- Genus Gibbula O. Boettger, 1877 accepted as Charpentieria (Gibbularia) Cecconi, 1908
- Genus Gibbularia Cecconi, 1908 (1)
- Genus Itala O. Boettger, 1877 accepted as Charpentieria Stabile, 1864
- Genus Laevissima O. Boettger, 1877 accepted as Delima W. Hartmann, 1842
- Genus Mauritanica O. Boettger, 1879 (4)
- Genus Papillifera W. Hartmann, 1842 (2)
- Genus Pedemontiana Pini, 1885 accepted as Charpentieria Stabile, 1864
- Genus Piceata O. Boettger, 1877 accepted as Charpentieria (Stigmatica) O. Boettger, 1877
- Genus Pollinia De Betta, 1870 accepted as Charpentieria Stabile, 1864
- Genus Robusta O. Boettger, 1877 accepted as Delima (Semirugata) O. Boettger, 1877
- Genus Sicania Tomlin, 1929 (3)
- Genus Siciliaria Vest, 1867 (7)
- Genus Stigmatica O. Boettger, 1877 (9)
- Genus Substricta O. Boettger, 1877 accepted as Delima W. Hartmann, 1842
- Genus Tirolica O. Boettger, 1877 accepted as Charpentieria Stabile, 1864
- Genus Torbana R. Brandt, 1956 accepted as Barcania R. Brandt, 1956
- Genus Trinacria O. Boettger, 1877 accepted as Charpentieria (Siciliaria) Vest, 1867
- Tribe Medorini H. Nordsieck, 1997 (227)
- Subfamily Clausiliinae J. E. Gray, 1855 (288)
- Subfamily Cochlodininae Lindholm, 1925 accepted as Cochlodinini Lindholm, 1925 (1923)
- Subfamily Constrictinae H. Nordsieck, 1981 † (7)
- Subfamily Eualopiinae H. Nordsieck, 1978 † (30)
- Subfamily Euxininae I. M. Likharev, 1962 accepted as Clausiliinae J. E. Gray, 1855
- Subfamily Garnieriinae C. R. Boettger, 1926 (61)
- Subfamily Laminiferinae Wenz, 1923 (24)
- Subfamily Mentissoideinae Lindholm, 1924 accepted as Mentissoideini Lindholm, 1924
- Subfamily Neniinae Wenz, 1923 (14)
- Subfamily Peruiniinae H. Nordsieck, 2005 (144)
- Subfamily Phaedusinae A. J. Wagner, 1922 (758)
- Subfamily Serrulininae Ehrmann, 1927 accepted as Serrulinini Ehrmann, 1927
- Subfamily Synprosphyminae H. Nordsieck, 2007 accepted as Phaedusinae A. J. Wagner, 1922
- Genus Cirrobasis Conrad, 1874 † (1)
- Genus Dactylius F. Sandberger, 1872 † accepted as Filholia Bourguignat, 1877 †
- Genus Dactylomorpha Gude, 1911 † accepted as Filholia Bourguignat, 1877 †
- Genus Dextroformosana O. Boettger & Schmacker, 1894 accepted as Formosana O. Boettger, 1877
- Genus Dextrospira Hrubesch, 1965 † (1)
- Genus Distortiphaedusa Grego & Szekeres, 2011 accepted as Oospira (Distortiphaedusa) Grego & Szekeres, 2011
- Genus Pirostoma Möllendorff, 1873 accepted as Macrogastra W. Hartmann, 1841
- Family Filholiidae Wenz, 1923 † (82)
- Family Palaeostoidae H. Nordsieck, 1986 † (15)
- Infraorder Helicina incertae sedis (3 210)
- Infraorder Helicoidei (5 691)
- 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