Between brackets is the number of accepted species
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- Mollusca (131 436)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (24 399)
- Class Caudofoveata (143)
- Class Cephalopoda (1 772)
- Class Conchifera accepted as Bivalvia
- Class Cricoconarida †
- Class Gastropoda (102 015)
- Subclass Amphigastropoda † (382)
- Subclass Angiogastropoda represented as Gastropoda
- Subclass Apogastropoda
- Subclass Caenogastropoda (53 059)
- Subterclass Sorbeoconcha (146)
- Superorder Hypsogastropoda
- Order Architaenioglossa (4 912)
- Order Caenogastropoda incertae sedis (7 640)
- Order Littorinimorpha (17 086)
- Superfamily Calyptraeoidea Lamarck, 1809 (202)
- Superfamily Capuloidea J. Fleming, 1822 (218)
- Superfamily Cassoidea accepted as Tonnoidea Suter, 1913 (1825)
- Superfamily Cingulopsoidea Fretter & Patil, 1958 (193)
- Superfamily Crepiduloidea J. Fleming, 1822 accepted as Calyptraeoidea Lamarck, 1809
- Superfamily Cypraeoidea Rafinesque, 1815 (1 213)
- Superfamily Eulimoidea R. A. Philippi, 1853 accepted as Vanikoroidea Gray, 1840
- Superfamily Ficoidea Meek, 1864 (1840) (71)
- Superfamily Heteropoda Lamarck, 1812 accepted as Pterotracheoidea Rafinesque, 1814
- Superfamily Hipponicoidea Troschel, 1861 (98)
- Superfamily Littorinoidea Children, 1834 (1 370)
- Superfamily Naticoidea Guilding, 1834 (687)
- Superfamily Pterotracheoidea Rafinesque, 1814 (63)
- Superfamily Rissoacea accepted as Rissooidea Gray, 1847
- Superfamily Rissoinoidea W. Stimpson, 1865 accepted as Rissooidea Gray, 1847
- Superfamily Rissooidea Gray, 1847 (2 309)
- Superfamily Stromboidea Rafinesque, 1815 (833)
- Superfamily Tonnoidea Suter, 1913 (1825) (786)
- Family Aquillidae Pilsbry, 1904 accepted as Cymatiidae Iredale, 1913 (1854)
- Family Bursidae Thiele, 1925 (89)
- Family Calcarellidae Schaufuss, 1869 accepted as Personidae Gray, 1854
- Family Cassidae Latreille, 1825 (252)
- Family Charoniidae A. W. B. Powell, 1933 (14)
- Subfamily Tritoninae Gray, 1847 accepted as Ranellidae Gray, 1854
- Genus Charonia Gistel, 1847 (7)
- Subgenus Charonia (Charoniella) A. W. B. Powell & Bartrum, 1929 † accepted as Proxicharonia A. W. B. Powell, 1938
- Subgenus Charonia (Sassia) Bellardi, 1873 † accepted as Sassia Bellardi, 1873
- Species Charonia (Sassia) angusta Traub, 1979 † accepted as Pseudosassia angusta (Traub, 1979) †
- Species Charonia (Sassia) danica Schnetler, 2001 † accepted as Pseudosassia danica (Schnetler, 2001) †
- Species Charonia (Sassia) karynjarynica Amitrov, 1971 † accepted as Pseudosassia karynjarynica (Amitrov, 1971) †
- Species Charonia (Sassia) menkrawitensis Beets, 1941 † accepted as Sassia menkrawitensis (Beets, 1941) †
- Species Charonia (Sassia) tarbelliana (Grateloup, 1833) † accepted as Pseudosassia turrita (Eichwald, 1830) †
- Subspecies Charonia (Sassia) tarbelliana transiens Báldi, 1973 † accepted as Pseudosassia turrita (Eichwald, 1830) †
- Species Charonia arthritica A. W. B. Powell & Bartrum, 1929 † accepted as Sassia arthritica (A. W. B. Powell & Bartrum, 1929) †
- Species Charonia capax H. J. Finlay, 1926 accepted as Charonia lampas (Linnaeus, 1758)
- Species Charonia clifdenensis H. J. Finlay, 1924 † accepted as Sassia neozelanica (P. Marshall & Murdoch, 1923) †
- Species Charonia crassa (Grateloup, 1847) † accepted as Charonia lampas (Linnaeus, 1758)
- Species Charonia digitalis (Reeve, 1844) accepted as Maculotriton serriale (Deshayes, 1833)
- Species Charonia euclia Hedley, 1914 accepted as Charonia lampas (Linnaeus, 1758)
- Species Charonia grandimaculatus (Reeve, 1844) accepted as Lotoria grandimaculata (Reeve, 1844)
- Species Charonia guichemerrei Lozouet, 1998 †
- Species Charonia lampas (Linnaeus, 1758)
- Species Charonia maculosum (Gmelin, 1791) accepted as Colubraria maculosa (Gmelin, 1791)
- Species Charonia marylenae Petuch & Berschauer, 2020
- Species Charonia mirabilis Parenzan, 1970 accepted as Charonia lampas (Linnaeus, 1758)
- Species Charonia multinodosa Traub, 1979 † accepted as Semiranella multinodosa (Traub, 1979) †
- Species Charonia nodifera (Lamarck, 1822) accepted as Charonia lampas (Linnaeus, 1758)
- Species Charonia poecilostoma (E. von Martens, 1904) accepted as Ranella gemmifera (Euthyme, 1889)
- Species Charonia powelli Cotton, 1957 accepted as Charonia lampas (Linnaeus, 1758)
- Species Charonia pustulata (Euthyme, 1889) accepted as Charonia lampas pustulata (Euthyme, 1889)
- Species Charonia rubicunda (G. Perry, 1811) accepted as Charonia lampas (Linnaeus, 1758)
- Species Charonia sauliae (Reeve, 1844) accepted as Charonia lampas (Linnaeus, 1758)
- Species Charonia seguenzae (Aradas & Benoit, 1871)
- Species Charonia tritonis (Linnaeus, 1758)
- Species Charonia variegata (Lamarck, 1816)
- Species Charonia veterior Lozouet, 1999 †
- Genus Eutriton accepted as Eutritonium Cossmann, 1904
- Genus Eutritonium Cossmann, 1904 accepted as Charonia Gistel, 1847 (1)
- Genus Nyctilochus Gistel, 1848 accepted as Cymatium Röding, 1798
- Genus Protocharonia Craig & Tracey, 2020 † (2)
- Genus Semiranella De Gregorio, 1880 † (4)
- Genus Triton Montfort, 1810 accepted as Charonia Gistel, 1847
- Genus Tritonium Röding, 1798 accepted as Charonia Gistel, 1847
- Family Cymatiidae Iredale, 1913 (1854) (297)
- Family Distorsioninae Beu, 1981 accepted as Personidae Gray, 1854
- Family Doliidae Latreille, 1825 accepted as Tonnidae Suter, 1913 (1825)
- Family Eosassiidae Bandel & Dockery, 2012 † accepted as Cymatiidae Iredale, 1913 (1854) (1)
- Family Galeodoliidae Sacco, 1891 accepted as Tonnidae Suter, 1913 (1825)
- Family Lampusiidae R. B. Newton, 1891 accepted as Cymatiidae Iredale, 1913 (1854)
- Family Laubierinidae Warén & Bouchet, 1990 (12)
- Family Lotoriidae G. F. Harris, 1897 accepted as Cymatiidae Iredale, 1913 (1854)
- Family Macgillivrayiidae H. Adams & A. Adams, 1854 accepted as Tonnidae Suter, 1913 (1825)
- Family Mataxidae Bandel & Dockery, 2012 † (2)
- Family Nyctilochidae Dall, 1912 accepted as Cymatiidae Iredale, 1913 (1854)
- Family Oocorythidae P. Fischer, 1885 accepted as Cassidae Latreille, 1825
- Family Personidae Gray, 1854 (42)
- Family Ranellidae Gray, 1854 (21)
- Family Septidae Dall & C. T. Simpson, 1901 accepted as Cymatiidae Iredale, 1913 (1854)
- Family Simpulidae Dautzenberg, 1900 accepted as Cymatiidae Iredale, 1913 (1854)
- Family Thalassocyonidae F. Riedel, 1995 (5)
- Family Tonnidae Suter, 1913 (1825) (51)
- Family Tritoniidae H. Adams & A. Adams, 1853 accepted as Ranellidae Gray, 1854
- Subfamily Personinae Gray, 1854 accepted as Personidae Gray, 1854
- Superfamily Truncatelloidea J. E. Gray, 1840 (6 892)
- Superfamily Vanikoroidea Gray, 1840 (1 332)
- Superfamily Velutinoidea Gray, 1840 (647)
- Superfamily Vermetoidea Rafinesque, 1815 (172)
- Superfamily Xenophoroidea Troschel, 1852 (1840) accepted as Stromboidea Rafinesque, 1815
- Order Neogastropoda (23 275)
- Order Stenoglossa accepted as Neogastropoda
- Subclass Gastropoda incertae sedis (298)
- Subclass Heterobranchia (39 107)
- Subclass Neomphaliones accepted as Vetigastropoda
- Subclass Neritimorpha (1 897)
- Subclass Orthogastropoda represented as Gastropoda
- Subclass Patellogastropoda (510)
- Subclass Prosobranchia
- Subclass Psilogastropoda represented as Gastropoda
- Subclass Vetigastropoda (6 762)
- Class Lamellibranchiata accepted as Bivalvia
- Class Loricata accepted as Polyplacophora
- Class Mollusca incertae sedis † (371)
- Class Monoplacophora (229)
- Class Pelecypoda accepted as Bivalvia
- Class Polyplacophora (1 378)
- Class Polyplaxiphora accepted as Polyplacophora
- Class Rostroconchia † (64)
- Class Scaphopoda (752)
- Class Solenoconchia accepted as Scaphopoda
- Class Solenogastres (313)
- Subclass Chaetodermomorpha accepted as Caudofoveata