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)
- Subterclass Sorbeoconcha (147)
- Superorder Hypsogastropoda
- Order Architaenioglossa (4 918)
- Superfamily Ampullarioidea Gray, 1824 (250)
- Superfamily Cyclophoroidea J. E. Gray, 1847 (3 904)
- Family Aciculidae J. E. Gray, 1850 (103)
- Family Acmeidae Pollonera, 1905 accepted as Aciculidae J. E. Gray, 1850
- Family Alycaeidae W. T. Blanford, 1864 accepted as Alycaeinae W. T. Blanford, 1864
- Family Bolaniidae Wenz, 1915 accepted as Craspedopomatidae Kobelt & Möllendorff, 1898
- Family Cochlostomatidae Kobelt, 1902 (118)
- Genus Apolloniana Brandt, 1958 accepted as Cochlostoma Jan, 1830
- Genus Auritus Westerlund, 1883 accepted as Cochlostoma (Auritus) Westerlund, 1883
- Genus Cochlostoma Jan, 1830 (89)
- Subgenus Cochlostoma (Apolloniana) Brandt, 1958 accepted as Cochlostoma Jan, 1830
- Subgenus Cochlostoma (Auritus) Westerlund, 1883 represented as Cochlostoma Jan, 1830
- Subgenus Cochlostoma (Cinerascens) A. J. Wagner, 1897 represented as Cochlostoma Jan, 1830
- Subgenus Cochlostoma (Clessiniella) Zallot, Groenenberg, De Mattia, Fehér & E. Gittenberger, 2015 accepted as Cochlostoma (Neglecta) A. J. Wagner, 1897
- Subgenus Cochlostoma (Cochlostoma) Jan, 1830 represented as Cochlostoma Jan, 1830
- Subgenus Cochlostoma (Dalfreddia) Zallot, Groenenberg, De Mattia, Fehér & E. Gittenberger, 2015 represented as Cochlostoma Jan, 1830
- Subgenus Cochlostoma (Eupomatias) A. J. Wagner, 1897 represented as Cochlostoma Jan, 1830
- Subgenus Cochlostoma (Holcopoma) Kobelt & Möllendorff, 1899 accepted as Cochlostoma (Auritus) Westerlund, 1883
- Subgenus Cochlostoma (Lovcenia) Zallot, Groenenberg, De Mattia, Fehér & E. Gittenberger, 2015 represented as Cochlostoma Jan, 1830
- Subgenus Cochlostoma (Neglecta) A. J. Wagner, 1897 represented as Cochlostoma Jan, 1830
- Subgenus Cochlostoma (Obscurella) Clessin, 1889 accepted as Obscurella Clessin, 1889
- Subgenus Cochlostoma (Personatus) Westerlund, 1883 accepted as Cochlostoma (Auritus) Westerlund, 1883
- Subgenus Cochlostoma (Scalarina) A. J. Wagner, 1897 represented as Cochlostoma Jan, 1830
- Subgenus Cochlostoma (Titanopoma) A. J. Wagner, 1897 accepted as Cochlostoma (Auritus) Westerlund, 1883
- Subgenus Cochlostoma (Turritus) Westerlund, 1883 represented as Cochlostoma Jan, 1830
- Species Cochlostoma achaicum (O. Boettger, 1885)
- Species Cochlostoma acutum (Caziot, 1908)
- Species Cochlostoma adamii (Paulucci, 1879)
- Species Cochlostoma affine (Benoit, 1882)
- Species Cochlostoma agriotes (Paulucci, 1879)
- Species Cochlostoma alleryanum (Paulucci, 1879)
- Species Cochlostoma anomphale Boeckel, 1939
- Species Cochlostoma arnautorum (A. J. Wagner, 1906)
- Species Cochlostoma atlanticum (Bourguignat, 1868)
- Species Cochlostoma auritum (Rossmässler, 1837)
- Species Cochlostoma barcaense Brandt, 1958
- Species Cochlostoma barthelemianum (Schuttleworth, 1852)
- Species Cochlostoma bosnicum (Servain, 1884)
- Species Cochlostoma braueri (A. J. Wagner, 1897)
- Species Cochlostoma cassiniacum (Paulucci, 1878)
- Species Cochlostoma cinerascens (Rossmässler, 1837)
- Species Cochlostoma clessini (Hirc, 1880) accepted as Cochlostoma nanum (Westerlund, 1879)
- Species Cochlostoma corcyrense (Westerlund, 1885)
- Species Cochlostoma crassicosta (F. Sandberger, 1870) † accepted as Obscurella crassicosta (F. Sandberger, 1870) †
- Species Cochlostoma cretense (Maltzan, 1887)
- Species Cochlostoma crosseanum (Paulucci, 1879)
- Species Cochlostoma dalmatinum (L. Pfeiffer, 1863)
- Species Cochlostoma dubium (K. Miller, 1907) †
- Species Cochlostoma dubium (A. J. Wagner, 1897)
- Species Cochlostoma ebfraasii (Jooss, 1902) †
- Species Cochlostoma elegans (Clessin, 1879)
- Species Cochlostoma elongatum (Paulucci, 1879)
- Species Cochlostoma erika (A. J. Wagner, 1906)
- Species Cochlostoma esuanum Manganelli & Fo. Giusti, 1997 †
- Species Cochlostoma euboicum (Westerlund, 1885)
- Species Cochlostoma excellens (Jooss, 1912) †
- Species Cochlostoma fischerianum (Paulucci, 1879)
- Species Cochlostoma fontqueri F. Haas, 1924
- Species Cochlostoma fuchsi Fehér, 2004
- Species Cochlostoma georgi (A. J. Wagner, 1906)
- Species Cochlostoma gilvum (Paulucci, 1880) accepted as Cochlostoma adamii (Paulucci, 1879)
- Species Cochlostoma gracile (L. Pfeiffer, 1849)
- Species Cochlostoma hallgassi Zallot, Kamchev, Schilthuizen, Fehér, De Mattia & E. Gittenberger, 2024
- Species Cochlostoma hellenicum (Saint-Simon, 1869)
- Species Cochlostoma henricae (Strobel, 1851)
- Species Cochlostoma heterostoma (F. E. Edwards, 1852) † accepted as Obscurella heterostoma (F. E. Edwards, 1852) †
- Species Cochlostoma heterostomum (F. E. Edwards, 1852) † accepted as Obscurella heterostoma (F. E. Edwards, 1852) †
- Species Cochlostoma hochwaldense (Gutzwiller, 1905) †
- Species Cochlostoma hoyeri (Poliński, 1923)
- Species Cochlostoma jakschae Zallot, Fehér & E. Gittenberger, 2018
- Species Cochlostoma japygium (Westerlund, 1885)
- Species Cochlostoma kleciaki (M. Braun, 1887)
- Species Cochlostoma kontschani Zallot, Kamchev, Schilthuizen, Fehér, De Mattia & E. Gittenberger, 2024
- Species Cochlostoma labellum (Thomä, 1845) †
- Species Cochlostoma lacazei Zallot, Kamchev, Schilthuizen, Fehér, De Mattia & E. Gittenberger, 2024
- Species Cochlostoma lamellosum (F. Sandberger, 1871) † accepted as Obscurella lamellosa (F. Sandberger, 1871) †
- Species Cochlostoma lanatum Zallot, Fehér & E. Gittenberger, 2018
- Species Cochlostoma letourneuxi (Bourguignat, 1866)
- Species Cochlostoma macei (Bourguignat, 1870)
- Species Cochlostoma marcellanum (Oppenheim, 1890) †
- Species Cochlostoma maresi (A. Letourneux, 1870)
- Species Cochlostoma mariannae H. Nordsieck, 2011
- Species Cochlostoma martensianum (Möllendorff, 1873)
- Species Cochlostoma mienisi Schütt, 1978
- Species Cochlostoma mnelense (A. J. Wagner, 1914)
- Species Cochlostoma moloti (Cossmann, 1907) †
- Species Cochlostoma montanum (Issel, 1866)
- Species Cochlostoma monticola (Bourguignat, 1887) accepted as Cochlostoma letourneuxi (Bourguignat, 1866)
- Species Cochlostoma mostarense (A. J. Wagner, 1906)
- Species Cochlostoma muranyii Zallot, Kamchev, Schilthuizen, Fehér, De Mattia & E. Gittenberger, 2024
- Species Cochlostoma nanum (Westerlund, 1879)
- Species Cochlostoma oribates (Westerlund, 1885) accepted as Cochlostoma tessellatum tessellatum (Rossmässler, 1837)
- Species Cochlostoma pageti W. Klemm, 1962
- Species Cochlostoma paladilheanum (Saint-Simon, 1869)
- Species Cochlostoma pallgergelyi Zallot, Kamchev, Schilthuizen, Fehér, De Mattia & E. Gittenberger, 2024
- Species Cochlostoma parnonis Schütt, 1981
- Species Cochlostoma parvulum (Deshayes, 1863) †
- Species Cochlostoma patulum (Draparnaud, 1801)
- Subspecies Cochlostoma patulum fontqueri F. Haas, 1924 accepted as Cochlostoma fontqueri F. Haas, 1924
- Subspecies Cochlostoma patulum patulum (Draparnaud, 1801) accepted as Cochlostoma patulum (Draparnaud, 1801)
- Species Cochlostoma philippianum (Gredler, 1853)
- Species Cochlostoma pinteri Fehér, 2004
- Species Cochlostoma polonicum (Łomnicki, 1902) †
- Species Cochlostoma porroi (Strobel, 1850)
- Species Cochlostoma proximum (Cossmann, 1888) †
- Species Cochlostoma pupaeformis Simionescu & Barbu, 1940 † accepted as Chondrula pupaeformis (Simionescu & Barbu, 1940) †
- Species Cochlostoma reitteri (O. Boettger, 1880)
- Species Cochlostoma ressonii (de Raincourt, 1876) † accepted as Obscurella ressonii (de Raincourt, 1876) †
- Species Cochlostoma roseoli (A. J. Wagner, 1901)
- Species Cochlostoma salomoni (Geyer, 1914) †
- Species Cochlostoma sardoum (Westerlund, 1890)
- Species Cochlostoma scalariniforme (A. J. Wagner, 1906)
- Species Cochlostoma scalarinum (A. Villa & G. B. Villa, 1841)
- Species Cochlostoma septemspirale (Razoumowsky, 1789)
- Species Cochlostoma simrothi (Caziot, 1908)
- Species Cochlostoma sospes (Westerlund, 1879)
- Species Cochlostoma stelucarum Zallot, De Mattia, Fehér & E. Gittenberger, 2021
- Species Cochlostoma stossichi (Hirc, 1881)
- Species Cochlostoma sturanii (A. J. Wagner, 1897)
- Species Cochlostoma stussineri (A. J. Wagner, 1897)
- Species Cochlostoma subalpinum (Pini, 1885)
- Species Cochlostoma suevicum (F. Sandberger, 1875) †
- Species Cochlostoma susaense Brandt, 1958
- Species Cochlostoma tergestinum (Westerlund, 1878)
- Species Cochlostoma tessellatum (Rossmässler, 1837)
- Species Cochlostoma tropojanum Zallot, Fehér & E. Gittenberger, 2018
- Species Cochlostoma turriculatum (R. A. Philippi, 1836)
- Species Cochlostoma valsabianum (Pini, 1885)
- Species Cochlostoma vectiense (S. V. Wood, 1877) †
- Species Cochlostoma villae (Strobel, 1851)
- Species Cochlostoma waldemari (A. J. Wagner, 1897)
- Species Cochlostoma westerlundi (Paulucci, 1879)
- Species Cochlostoma zawinkanum (A. J. Wagner, 1906)
- Genus Electrea Klebs, 1886 † (1)
- Genus Elektrea [sic] † accepted as Electrea Klebs, 1886 †
- Genus Hartmannia R. B. Newton, 1891 accepted as Cochlostoma (Turritus) Westerlund, 1883
- Genus Holcopoma Kobelt & Möllendorff, 1899 accepted as Cochlostoma (Auritus) Westerlund, 1883
- Genus Imerezia Zallot, Groenenberg, De Mattia, Fehér & E. Gittenberger, 2015 accepted as Rara A. J. Wagner, 1897
- Genus Obscurella Clessin, 1889 (24)
- Genus Personatus Westerlund, 1883 accepted as Cochlostoma (Auritus) Westerlund, 1883
- Genus Pleuropoma A. J. Wagner, 1897 accepted as Cochlostoma (Auritus) Westerlund, 1883
- Genus Pleuropomatia Tomlin, 1929 accepted as Holcopoma Kobelt & Möllendorff, 1899
- Genus Proelektrea Hrubesch, 1965 † (1)
- Genus Rara A. J. Wagner, 1897 (1)
- Genus Rhabdotakra A. J. Wagner, 1897 (1)
- Genus Stereopoma A. J. Wagner, 1897 accepted as Cochlostoma (Turritus) Westerlund, 1883
- Genus Striolata A. J. Wagner, 1897 (1)
- Genus Strobelia Clessin, 1889 accepted as Cochlostoma (Eupomatias) A. J. Wagner, 1897
- Genus Toffolettia Fo. Giusti, 1971 accepted as Striolata A. J. Wagner, 1897
- Genus Wagneriola Zallot, Groenenberg, De Mattia, Fehér & E. Gittenberger, 2015 accepted as Cochlostoma (Scalarina) A. J. Wagner, 1897
- Family Craspedopomatidae Kobelt & Möllendorff, 1898 (21)
- Family Cyclophoridae J. E. Gray, 1847 (1 604)
- Family Cytoridae Climo, 1969 accepted as Liareinae A. W. B. Powell, 1946
- Family Dicristidae A. N. Golikov & Starobogatov, 1975 accepted as Neocyclotidae Kobelt & Möllendorff, 1897
- Family Diplommatinidae L. Pfeiffer, 1856 (1 026)
- Family Ferussinidae Wenz, 1923 (1915) † accepted as Ferussininae Wenz, 1923 (1915) †
- Family Hainesiidae Thiele, 1929 (220)
- Family Lagocheilidae Stoliczka, 1872 accepted as Cyclophoridae J. E. Gray, 1847
- Family Maizaniidae Tielecke, 1940 (40)
- Family Megalomastomatidae W. T. Blanford, 1864 (100)
- Family Megalostomatidae [sic] accepted as Megalomastomatidae W. T. Blanford, 1864
- Family Neocyclotidae Kobelt & Möllendorff, 1897 (242)
- Family Pupinidae L. Pfeiffer, 1853 (427)
- Family Strophostomatidae Wenz, 1915 † accepted as Ferussininae Wenz, 1923 (1915) †
- Genus Carinomphalus W. Yü, 1974 † (1)
- Genus Diplommoptychia Maillard, 1884 †
- Genus Loriolina Huckriede, 1967 † (1)
- Genus Maillardinus Bandel, 1991 † (1)
- Superfamily Viviparoidea Gray, 1847 (764)
- Order Caenogastropoda incertae sedis (7 676)
- Order Littorinimorpha (17 179)
- Order Neogastropoda (23 716)
- Order Stenoglossa accepted as Neogastropoda
- Subclass Gastropoda incertae sedis (308)
- Subclass Heterobranchia (39 156)
- 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