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- Mollusca (132 738)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (24 984)
- Class Caudofoveata (143)
- Class Cephalopoda (1 830)
- Class Conchifera accepted as Bivalvia
- Class Cricoconarida † (1)
- Class Gastropoda (102 673)
- Subclass Amphigastropoda † (387)
- Subclass Angiogastropoda represented as Gastropoda
- Subclass Apogastropoda
- Subclass Caenogastropoda (53 618)
- Subterclass Sorbeoconcha (147)
- Superorder Hypsogastropoda
- Order Architaenioglossa (4 917)
- Order Caenogastropoda incertae sedis (7 675)
- Suborder Heteroglossa
- Suborder Ptenoglossa
- Superfamily Abyssochrysoidea Tomlin, 1927 (104)
- Superfamily Acteoninoidea Cossmann, 1895 †
- Superfamily Campaniloidea (288)
- Superfamily Cerithioidea J. Fleming, 1822 (3 706)
- Family Alabinidae Dall, 1927 accepted as Bittiinae Cossmann, 1906
- Family Amphimelaniidae P. Fischer & Crosse, 1891 (14)
- Family Anaplocamidae Dall, 1921 accepted as Pleuroceridae P. Fischer, 1885 (1863)
- Family Aplodontidae Kuroda, 1933 accepted as Modulidae P. Fischer, 1884
- Family Archimediellidae Starobogatov, 1982 accepted as Turritellinae Lovén, 1847
- Family Bathanaliidae Ancey, 1906 accepted as Hauttecoeuriinae Bourguignat, 1885
- Family Batillariidae Thiele, 1929 (99)
- Family Bittiidae accepted as Bittiinae Cossmann, 1906
- Family Brachytrematidae Cossmann, 1906 † (25)
- Family Ceriphasiidae Gill, 1863 accepted as Pleuroceridae P. Fischer, 1885 (1863)
- Family Cerithideidae Houbrick, 1988 accepted as Potamididae H. Adams & A. Adams, 1854
- Family Cerithiidae J. Fleming, 1822 (540)
- Subfamily Bittiinae Cossmann, 1906 (185)
- Subfamily Cerithiidae incertae sedis (36)
- Subfamily Cerithiinae J. Fleming, 1822 (305)
- Genus Aluco Link, 1807 accepted as Pseudovertagus Vignal, 1904
- Genus Bayericerithium Petuch, 2001 accepted as Cerithium Bruguière, 1789
- Genus Cerithioclava Olsson & Harbison, 1953 (2)
- Genus Cerithium Bruguière, 1789 (150)
- Genus Clava Jousseaume, 1883 accepted as Rhinoclavis Swainson, 1840
- Genus Clavocerithium Cossmann, 1920 (5)
- Genus Clypeomorus Jousseaume, 1888 (19)
- Species Clypeomorus admirabilis Houbrick, 1985
- Species Clypeomorus adunca (A. Gould, 1849)
- Species Clypeomorus alasaensis Wissema, 1947 †
- Species Clypeomorus batillariaeformis Habe & Kosuge, 1966
- Species Clypeomorus bifasciata (G. B. Sowerby II, 1855)
- Species Clypeomorus bifasciatum [sic] accepted as Clypeomorus bifasciata (G. B. Sowerby II, 1855)
- Species Clypeomorus bivaricatus Ludbrook, 1941 † accepted as Zeacumantus bivaricatus (Ludbrook, 1941) †
- Species Clypeomorus brevis (Quoy & Gaimard, 1834)
- Species Clypeomorus caeruleum (G. B. Sowerby II, 1855) accepted as Cerithium caeruleum G. B. Sowerby II, 1855
- Species Clypeomorus chemnitziana (Pilsbry, 1901) accepted as Clypeomorus petrosa chemnitziana (Pilsbry, 1901)
- Species Clypeomorus clypeomorus Jousseaume, 1888
- Species Clypeomorus concisus (Hombron & Jacquinot, 1848) accepted as Clypeomorus bifasciata (G. B. Sowerby II, 1855)
- Species Clypeomorus coralium (Kiener, 1841) accepted as Cerithium coralium Kiener, 1841
- Species Clypeomorus gennesi (H. Fischer & Vignal, 1901) accepted as Clypeomorus isselii (Pagenstecher, 1877)
- Species Clypeomorus humilis (Dunker, 1861) accepted as Clypeomorus bifasciata (G. B. Sowerby II, 1855)
- Species Clypeomorus inflata (Quoy & Gaimard, 1834)
- Species Clypeomorus irrorata (A. Gould, 1849)
- Species Clypeomorus isselii (Pagenstecher, 1877)
- Species Clypeomorus moniliferus (Kiener, 1841) accepted as Clypeomorus batillariaeformis Habe & Kosuge, 1966
- Species Clypeomorus morus (Lamarck, 1822) accepted as Clypeomorus bifasciata (G. B. Sowerby II, 1855)
- Species Clypeomorus multiliratus Ludbrook, 1941 † accepted as Zeacumantus multiliratus (Ludbrook, 1941) †
- Species Clypeomorus nympha Houbrick, 1985
- Species Clypeomorus pellucida (Hombron & Jacquinot, 1848)
- Species Clypeomorus penthusarus Iredale, 1929 accepted as Clypeomorus bifasciata (G. B. Sowerby II, 1855)
- Species Clypeomorus petrosa (W. Wood, 1828)
- Subspecies Clypeomorus petrosa chemnitziana (Pilsbry, 1901)
- Subspecies Clypeomorus petrosa gennesi (H. Fischer & Vignal, 1901) accepted as Clypeomorus isselii (Pagenstecher, 1877)
- Subspecies Clypeomorus petrosa isselii (Pagenstecher, 1877) accepted as Clypeomorus isselii (Pagenstecher, 1877)
- Subspecies Clypeomorus petrosa petrosa (W. Wood, 1828)
- Species Clypeomorus purpurastoma Houbrick, 1985
- Species Clypeomorus subbrevicula (Oostingh, 1925)
- Species Clypeomorus tjilonganensis (K. Martin, 1899) †
- Species Clypeomorus traillii (G. B. Sowerby II, 1855) accepted as Cerithium traillii G. B. Sowerby II, 1855
- Species Clypeomorus tuberculatus (Linnaeus, 1767) accepted as Cerithium tuberculatum (Linnaeus, 1767)
- Species Clypeomorus verbeekii (H. Woodward, 1880) †
- Species Clypeomorus wainingoli Ladd, 1972 †
- Species Clypeomorus woodwardi (K. Martin, 1884) †
- Species Clypeomorus zonatus (W. Wood, 1828) accepted as Cerithium zonatum (W. Wood, 1828)
- Genus Colina H. Adams & A. Adams, 1854 (18)
- Genus Colinia Cossmann, 1906 accepted as Colina H. Adams & A. Adams, 1854
- Genus Contumax Hedley, 1899 accepted as Cerithium Bruguière, 1789
- Genus Drillocerithium Monterosato, 1910 accepted as Cerithium Bruguière, 1789
- Genus Fastigiella Reeve, 1848 (3)
- Genus Gladiocerithium Monterosato, 1910 accepted as Cerithium Bruguière, 1789
- Genus Globulocerithium Pacaud, 2023 † (19)
- Genus Gourmierium Jousseaume, 1894 accepted as Cerithium Bruguière, 1789
- Genus Gourmya P. Fischer, 1884 (10)
- Genus Hirtocerithium Monterosato, 1910 accepted as Cerithium Bruguière, 1789
- Genus Indocerithium Chavan, 1952 accepted as Clavocerithium (Indocerithium) Chavan, 1952
- Genus Liocerithium Sacco, 1894 † accepted as Cerithium Bruguière, 1789
- Genus Liocerithium Tryon, 1887 (2)
- Genus Lithocerithium Monterosato, 1910 accepted as Cerithium Bruguière, 1789
- Genus Ochetoclava Woodring, 1928 accepted as Rhinoclavis Swainson, 1840
- Genus Orthochetus Cossmann, 1889 † (3)
- Genus Peraubium Dominici & Kowalke, 2014 † (1)
- Genus Pithocerithium † accepted as Cerithium Bruguière, 1789
- Genus Proclava Thiele, 1929 accepted as Rhinoclavis (Proclava) Thiele, 1929 (1)
- Genus Pseudovertagus Vignal, 1904 (13)
- Genus Ptychocerithium Sacco, 1895 † (17)
- Genus Rhinoclavis Swainson, 1840 (40)
- Genus Royella Iredale, 1912 (1)
- Genus Semivertagus Cossmann, 1889 accepted as Rhinoclavis (Semivertagus) Cossmann, 1889 (1)
- Genus Thericium Monterosato, 1890 accepted as Cerithium Bruguière, 1789
- Genus Vertagus Schumacher, 1817 accepted as Rhinoclavis Swainson, 1840
- Subfamily Colininae A. N. Golikov & Starobogatov, 1987 accepted as Cerithiinae J. Fleming, 1822
- Subfamily Probittiinae Bandel, 2006 † (1)
- Subfamily Pseudotritoniinae A. N. Golikov & Starobogatov, 1987 † accepted as Pseudotritoniidae A. N. Golikov & Starobogatov, 1987 †
- Subfamily Rhinoclavinae Gründel, 1982 accepted as Cerithiinae J. Fleming, 1822
- Subfamily Tiaracerithiinae Bouniol, 1981 † accepted as Batillariidae Thiele, 1929
- Genus Ashrafiella Nevesskaja, Goncharova & Iljina, 1986 † accepted as Bogatschevia A. A. Ali-Zade & Kabakova, 1969 †
- Genus Bogatschevia A. A. Ali-Zade & Kabakova, 1969 †
- Genus Chavanicerithium Ludbrook, 1957 † (8)
- Genus Conocerithium Sacco, 1895 † (2)
- Genus Elassum Woodring, 1946 † accepted as Alabina Dall, 1902
- Genus Manulona Ludbrook, 1941 † (2)
- Genus Occidentocerithium Nützel, Blodgett & Stanley, 2003 † (1)
- Genus Texania K. van W. Palmer, 1937 † accepted as Texmelanatria K. van W. Palmer, 1942 †
- Family Cerithioidea incertae sedis (5)
- Family Dialidae Kay, 1979 (18)
- Family Diastomatidae Cossmann, 1894 (32)
- Family Ellipstomatidae Hannibal, 1912 accepted as Pleuroceridae P. Fischer, 1885 (1863)
- Family Eustomatidae Cossmann, 1906 † (1)
- Family Faxiidae Ravn, 1933 † accepted as Sherborniidae Iredale, 1917
- Family Finellidae Thiele, 1929 accepted as Scaliolidae Jousseaume, 1912
- Family Fossaridae A. Adams, 1860 accepted as Fossarinae A. Adams, 1860
- Family Giraudiidae Bourguignat, 1885 accepted as Hauttecoeuriinae Bourguignat, 1885
- Family Glauconiidae Pchelintsev, 1953 † accepted as Cassiopidae Beurlen, 1967 †
- Family Hemisinidae P. Fischer & Crosse, 1891 (124)
- Family Hilacanthidae Bourguignat, 1886 accepted as Hauttecoeuriinae Bourguignat, 1885
- Family Juramelanatriidae Bandel, 2006 † accepted as Thiaridae Gill, 1871 (1823)
- Family Ladinulidae Bandel, 1992 † (3)
- Family Lavigeriidae Thiele, 1925 accepted as Paludomidae Stoliczka, 1868
- Family Limnotrochidae Ancey, 1906 accepted as Hauttecoeuriinae Bourguignat, 1885
- Family Litiopidae Gray, 1847 (65)
- Family Maoraxidae Bandel, Gründel & P. A. Maxwell, 2000 † (1)
- Family Melanatriidae Thiele, 1921 accepted as Pachychilidae P. Fischer & Crosse, 1892
- Family Melaniidae Children, 1823 accepted as Thiaridae Gill, 1871 (1823)
- Family Melanoididae Ihering, 1909 accepted as Thiaridae Gill, 1871 (1823)
- Family Melanopsidae H. Adams & A. Adams, 1854 (430)
- Family Modulidae P. Fischer, 1884 (50)
- Family Nassopsidae Kesteven, 1903 accepted as Hauttecoeuriinae Bourguignat, 1885
- Family Obtortionidae Thiele, 1925 accepted as Scaliolidae Jousseaume, 1912
- Family Omalaxidae Cossmann, 1916 † accepted as Omalaxinae Cossmann, 1916 †
- Family Pachychilidae P. Fischer & Crosse, 1892 (401)
- Family Pachymelaniidae Bandel & Kowalke, 1999 accepted as Hemisinidae P. Fischer & Crosse, 1891
- Family Paludomidae Stoliczka, 1868 (152)
- Family Paramelaniidae J. E. S. Moore, 1898 accepted as Hauttecoeuriinae Bourguignat, 1885
- Family Pelycidiidae Ponder & S. J. Hall, 1983 (17)
- Family Pickworthiidae Iredale, 1917 (98)
- Family Planaxidae J. E. Gray, 1850 (81)
- Family Pleuroceridae P. Fischer, 1885 (1863) (247)
- Family Popenellidae Bandel, 1992 † (1)
- Family Potadomatidae Pilsbry & Bequaert, 1927 accepted as Pachychilidae P. Fischer & Crosse, 1892
- Family Potamididae H. Adams & A. Adams, 1854 (226)
- Family Prisciphoridae Bandel, Gründel & P. A. Maxwell, 2000 † accepted as Eumetulinae A. N. Golikov & Starobogatov, 1975
- Family Procerithiidae Cossmann, 1906 † (35)
- Family Propupaspiridae Nützel, Pan & Erwin, 2002 † (2)
- Family Prostyliferidae Bandel, 1992 † (1)
- Family Pyrazidae Hacobjan, 1972 accepted as Batillariidae Thiele, 1929
- Family Reynellonidae Iredale, 1917 accepted as Pickworthiinae Iredale, 1917
- Family Rumellidae Ancey, 1906 accepted as Hauttecoeuriinae Bourguignat, 1885
- Family Scaliolidae Jousseaume, 1912 (67)
- Family Semisulcospiridae J. P. E. Morrison, 1952 (135)
- Family Sherborniidae Iredale, 1917 (2)
- Family Siliquariidae Anton, 1838 (57)
- Family Spekiidae Ancey, 1906 accepted as Hauttecoeuriinae Bourguignat, 1885
- Family Strepomatidae Haldeman, 1864 accepted as Pleuroceridae P. Fischer, 1885 (1863)
- Family Styliferinidae Bandel, 1992 accepted as Litiopidae Gray, 1847
- Family Syrnolopsidae Bourguignat, 1890 accepted as Hauttecoeuriinae Bourguignat, 1885
- Family Telescopiidae J. K. Allan, 1950 accepted as Potamididae H. Adams & A. Adams, 1854
- Family Tenagodidae Gill, 1871 accepted as Siliquariidae Anton, 1838
- Family Terebrellidae Delpey, 1941 † accepted as Metacerithiidae Cossmann, 1906 †
- Family Thiaridae Gill, 1871 (1823) (224)
- Family Tiphobiidae Bourguignat, 1886 accepted as Hauttecoeuriinae Bourguignat, 1885
- Family Turritellidae Lovén, 1847 (547)
- Family Vermiculariidae Dall, 1915 accepted as Turritellinae Lovén, 1847
- Family Zardinellopsidae Bandel, 2006 † (2)
- Family Zemelanopsidae Neiber & Glaubrecht, 2019 (4)
- Subfamily Aylacostomatinae Parodiz, 1969 accepted as Hemisinidae P. Fischer & Crosse, 1891
- Subfamily Hemisininae P. Fischer & Crosse, 1891 accepted as Hemisinidae P. Fischer & Crosse, 1891
- Superfamily Cerithiopsoidea accepted as Triphoroidea J. E. Gray, 1847
- Superfamily Epitonioidea S. S. Berry, 1910 (1812) (1 091)
- Superfamily Eulimacea accepted as Eulimoidea R. A. Philippi, 1853
- Superfamily Orthonematoidea Nützel & Bandel, 2000 † (107)
- Superfamily Palaeostyloidea Wenz, 1938 † (17)
- Superfamily Peruneloidea Frýda & Bandel, 1997 † (3)
- Superfamily Soleniscoidea Knight, 1931 † (52)
- Superfamily Subulitoidea Lindström, 1884 † (11)
- Superfamily Triphoroidea J. E. Gray, 1847 (2 157)
- Family Acanthonematidae Wenz, 1938 †
- Family Ampezzanildidae Bandel, 1994 † (1)
- Family Aqabarellidae Alhejoj, Bandel & Al-Najjar, 2016 accepted as Tornidae Sacco, 1896 (1884)
- Family Coelostylinidae Cossmann, 1908 † (16)
- Family Lyocyclidae Thiele, 1925 (37)
- Family Plicatusidae Pan & Erwin, 2002 †
- Family Pragoscutulidae Frýda, 1998 †
- Family Pseudomelaniidae R. Hoernes, 1884 † (81)
- Family Spanionematidae A. N. Golikov & Starobogatov, 1987 †
- Family Spirostylidae Cossmann, 1909 †
- Family Trajanellidae Pchelintsev, 1951 † accepted as Pseudomelaniidae R. Hoernes, 1884 †
- Genus Boreioconus Guzhov, 2015 † (1)
- Genus Costasphaera Gründel & Nützel, 2015 † (1)
- Genus Dicolpus R. A. Philippi, 1887 †
- Genus Nixipileolus Guzhov, 2015 † (1)
- Genus Sassenfjordia Kaim, Hryniewicz, C. Little & Nakrem, 2017 † (1)
- Genus Spirocyclina Kittl, 1894 † accepted as Spirocyclus Wenz, 1938 †
- Genus Spirocyclus Wenz, 1938 †
- Order Littorinimorpha (17 166)
- Order Neogastropoda (23 713)
- Order Stenoglossa accepted as Neogastropoda
- Subclass Gastropoda incertae sedis (308)
- Subclass Heterobranchia (39 153)
- 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