Between brackets is the number of accepted species

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- Mollusca (132 851)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (25 013)
- Class Caudofoveata (143)
- Class Cephalopoda (1 834)
- Class Conchifera accepted as Bivalvia
- Class Cricoconarida † (1)
- Class Gastropoda (102 753)
- Subclass Amphigastropoda † (396)
- Subclass Angiogastropoda represented as Gastropoda
- Subclass Apogastropoda
- Subclass Caenogastropoda (53 670)
- Subterclass Sorbeoconcha (147)
- Superorder Hypsogastropoda
- Order Architaenioglossa (4 919)
- Order Caenogastropoda incertae sedis (7 677)
- Order Littorinimorpha (17 189)
- Superfamily Calyptraeoidea Lamarck, 1809 (203)
- 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 (1 294)
- 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 (99)
- Superfamily Littorinoidea Children, 1834 (1 372)
- Superfamily Naticoidea Guilding, 1834 (688)
- 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 (2 312)
- Superfamily Stromboidea Rafinesque, 1815 (835)
- Superfamily Tonnoidea Suter, 1913 (1825) (788)
- 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 (254)
- Subfamily Cassinae Latreille, 1825 (140)
- Genus Benthodolium A. E. Verrill, 1884 accepted as Oocorys P. Fischer, 1884
- Genus Casis [sic] accepted as Cassis Scopoli, 1777
- Genus Cassidaria Lamarck, 1816 accepted as Galeodea Link, 1807 (1)
- Subgenus Cassidaria (Galeodea) Link, 1807 accepted as Galeodea Link, 1807
- Species Cassidaria aquensis Magne & Vergneau-Saubade, 1973 † accepted as Cassis retusa Michelotti, 1861 †
- Species Cassidaria arntzenii K. Martin, 1914 † accepted as Galeodea arntzenii (K. Martin, 1914) †
- Species Cassidaria bistriata Settepassi, 1970 accepted as Galeodea echinophora (Linnaeus, 1758)
- Species Cassidaria brevidentata Aldrich, 1885 †
- Species Cassidaria bucquoyi Locard, 1886 accepted as Galeodea echinophora (Linnaeus, 1758)
- Species Cassidaria cahuzaci Magne & Saubade, 1976 † accepted as Galeodea megacephala cahuzaci (Magne & Saubade, 1976) †
- Species Cassidaria cingulata Lamarck, 1822 accepted as Linatella caudata (Gmelin, 1791)
- Species Cassidaria coronata Deshayes, 1830 † accepted as Galeodea coronata (Deshayes, 1830) †
- Species Cassidaria cretacea J. Müller, 1851 † accepted as Trochactaeon cretaceus (J. Müller, 1851) †
- Species Cassidaria cythara (Brocchi, 1814) † accepted as Morum cythara (Brocchi, 1814) †
- Species Cassidaria dautzenbergi Locard, 1886 accepted as Galeodea echinophora (Linnaeus, 1758)
- Species Cassidaria depressa R. A. Philippi, 1844 accepted as Galeodea rugosa (Linnaeus, 1771)
- Species Cassidaria depressa Buch, 1831 † accepted as Galeodea depressa (Buch, 1831) †
- Species Cassidaria deshayesii Duval, 1841 accepted as Fusimorio deshayesii (Duval, 1841)
- Species Cassidaria desori d'Archiac & Haime, 1854 † accepted as Galeodea desori (d'Archiac & Haime, 1854) †
- Species Cassidaria dubia Aldrich, 1885 †
- Species Cassidaria echinophora (Linnaeus, 1758) accepted as Galeodea echinophora (Linnaeus, 1758)
- Subspecies Cassidaria echinophora coronata Settepassi, 1970 accepted as Galeodea echinophora (Linnaeus, 1758)
- Subspecies Cassidaria echinophora ingens Settepassi, 1970 accepted as Galeodea echinophora (Linnaeus, 1758)
- Variety Cassidaria echinophora var. adriatica Mascarini, 1884 accepted as Galeodea echinophora (Linnaeus, 1758)
- Variety Cassidaria echinophora var. densetuberculata Settepassi, 1970 accepted as Galeodea echinophora (Linnaeus, 1758)
- Variety Cassidaria echinophora var. dentata Settepassi, 1970 accepted as Galeodea echinophora (Linnaeus, 1758)
- Variety Cassidaria echinophora var. dilatata Settepassi, 1970 accepted as Galeodea echinophora (Linnaeus, 1758)
- Variety Cassidaria echinophora var. dubia Cerulli-Irelli, 1911 accepted as Galeodea rugosa (Linnaeus, 1771)
- Variety Cassidaria echinophora var. globosa Bucquoy, Dautzenberg & Dollfus, 1882 accepted as Galeodea echinophora (Linnaeus, 1758)
- Variety Cassidaria echinophora var. globosocordonata Settepassi, 1970 accepted as Galeodea echinophora (Linnaeus, 1758)
- Variety Cassidaria echinophora var. minima Settepassi, 1970 accepted as Galeodea echinophora (Linnaeus, 1758)
- Variety Cassidaria echinophora var. multituberculata Settepassi, 1970 accepted as Galeodea echinophora (Linnaeus, 1758)
- Variety Cassidaria echinophora var. mutica Tiberi, 1863 accepted as Galeodea echinophora (Linnaeus, 1758)
- Variety Cassidaria echinophora var. obsoleta Bucquoy, Dautzenberg & Dollfus, 1882 accepted as Galeodea echinophora (Linnaeus, 1758)
- Variety Cassidaria echinophora var. solida Bucquoy, Dautzenberg & Dollfus, 1882 accepted as Galeodea echinophora (Linnaeus, 1758)
- Variety Cassidaria echinophora var. subdiadema Settepassi, 1970 accepted as Galeodea echinophora (Linnaeus, 1758)
- Variety Cassidaria echinophora var. subnodulosa Bucquoy, Dautzenberg & Dollfus, 1882 accepted as Galeodea echinophora (Linnaeus, 1758)
- Species Cassidaria enodis Deshayes, 1865 † accepted as Galeodea enodis (Deshayes, 1865) †
- Species Cassidaria erbi Haanstra & Spiker, 1932 † accepted as Galeodea erbi (Haanstra & Spiker, 1932) †
- Species Cassidaria formosa Alekseev, 1963 †
- Species Cassidaria funiculosa Deshayes, 1835 † accepted as Galeodea funiculosa (Deshayes, 1835) †
- Species Cassidaria gradata Tate, 1889 † accepted as Galeodea gradata (Tate, 1889) †
- Species Cassidaria harpaeformis Grateloup, 1827 † accepted as Morum cythara (Brocchi, 1814) †
- Species Cassidaria javana K. Martin, 1879 † accepted as Eudolium crosseanum (Monterosato, 1869)
- Species Cassidaria laevigata G. B. Sowerby I, 1850 † accepted as Sconsia laevigata (G. B. Sowerby I, 1850) †
- Species Cassidaria laevigata Grateloup, 1834 †
- Species Cassidaria lintea Conrad, 1847 †
- Species Cassidaria minbuensis Noetling, 1895 † accepted as Fusimorio minbuensis (Noetling, 1895) †
- Species Cassidaria mirabilis Wilckens, 1910 †
- Species Cassidaria mutica Michelotti, 1861 † accepted as Eudolium muticum (Michelotti, 1861) †
- Species Cassidaria orbigny Bellardi, 1852 † accepted as Sconsia orbigny (Bellardi, 1852) †
- Species Cassidaria planotecta O. Meyer & Aldrich, 1886 † accepted as Morio planotecta (O. Meyer & Aldrich, 1886) †
- Species Cassidaria plicata Calcara, 1840 accepted as Galeodea echinophora (Linnaeus, 1758)
- Species Cassidaria pliocenica Settepassi, 1970 accepted as Galeodea echinophora (Linnaeus, 1758)
- Species Cassidaria pretiosa Deshayes, 1865 † accepted as Galeodea pretiosa (Deshayes, 1865) †
- Species Cassidaria pschischica Korobkov, 1949 †
- Species Cassidaria pseudobistriata Settepassi, 1970 accepted as Galeodea echinophora (Linnaeus, 1758)
- Species Cassidaria scilla Risso, 1826 † accepted as Galeodea echinophora (Linnaeus, 1758)
- Species Cassidaria singularis Deshayes, 1865 † accepted as Galeodea singularis (Deshayes, 1865) †
- Species Cassidaria striata Lamarck, 1816 accepted as Sconsia grayi A. Adams, 1855
- Species Cassidaria striatula Bonelli, 1825 †
- Species Cassidaria sublaevigata Guppy, 1866 †
- Species Cassidaria sulcata F. W. Hutton, 1873 † accepted as Galeodea sulcata (F. W. Hutton, 1873) †
- Species Cassidaria textiliosa Deshayes, 1835 † accepted as Galeodea textiliosa (Deshayes, 1835) †
- Species Cassidaria tuberculata Risso, 1826 † accepted as Galeodea echinophora (Linnaeus, 1758)
- Species Cassidaria tuberculifera Hupé, 1854 † accepted as Echinophoria monilifera (G. B. Sowerby I, 1846) †
- Species Cassidaria tyrrhena (Gmelin, 1791) accepted as Galeodea rugosa (Linnaeus, 1771)
- Species Cassidaria uniseriata Settepassi, 1970 accepted as Galeodea echinophora (Linnaeus, 1758)
- Species Cassidaria washingtoniana C. E. Weaver, 1912 † accepted as Olequahia washingtoniana (C. E. Weaver, 1912) †
- Species Cassidaria wilsoni Tate, 1889 † accepted as Galeodea wilsoni (Tate, 1889) †
- Genus Cassidea Bruguière, 1789 accepted as Cassis Scopoli, 1777
- Genus Cassis Scopoli, 1777 (55)
- Genus Cassisoma Rovereto, 1899 † accepted as Cassis Scopoli, 1777
- Genus Cypraecassis Stutchbury, 1837 (10)
- Genus Cypraeicassis Cossmann, 1903 accepted as Cypraecassis Stutchbury, 1837
- Genus Dalium Dall, 1889 (3)
- Genus Echinora Schumacher, 1817 accepted as Galeodea Link, 1807
- Genus Eucorys Beu, 2008 (2)
- Genus Galeodea Link, 1807 (46)
- Genus Galeodosconsia Sacco, 1890 † accepted as Sconsia J. E. Gray, 1847
- Genus Galeoocorys Kuroda & T. Habe, 1957 accepted as Galeodea Link, 1807
- Genus Goniogalea Mörch, 1857 accepted as Cassis Scopoli, 1777
- Genus Hadroocorys Quinn, 1980 accepted as Oocorys P. Fischer, 1884
- Genus Haydenia Gabb, 1864 † (2)
- Genus Hypocassis Iredale, 1927 accepted as Cassis (Hypocassis) Iredale, 1927
- Genus Levenia Gray, 1847 accepted as Cypraecassis (Levenia) Gray, 1847
- Genus Microsconsia Beu, 2008 (1)
- Genus Morio Montfort, 1810 accepted as Galeodea Link, 1807
- Genus Nannocassis Iredale, 1927 accepted as Cassis (Hypocassis) Iredale, 1927
- Genus Oocorys P. Fischer, 1884 (5)
- Genus Sconsia J. E. Gray, 1847 (15)
- Genus Taieria Finlay & Marwick, 1937 † accepted as Galeodea Link, 1807
- Subfamily Oocorythinae P. Fischer, 1885 accepted as Cassinae Latreille, 1825
- Subfamily Phaliinae Beu, 1981 (113)
- Genus Morionassa Sacco, 1890 †
- Genus Sconsodolium Beu, 2005 † (1)
- Family Charoniidae A. W. B. Powell, 1933 (14)
- 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 (6 902)
- Superfamily Vanikoroidea Gray, 1840 (1 331)
- Superfamily Velutinoidea Gray, 1840 (648)
- Superfamily Vermetoidea Rafinesque, 1815 (172)
- Superfamily Xenophoroidea Troschel, 1852 (1840) accepted as Stromboidea Rafinesque, 1815
- Order Neogastropoda (23 738)
- Order Stenoglossa accepted as Neogastropoda
- Subclass Gastropoda incertae sedis (308)
- Subclass Heterobranchia (39 172)
- 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