Between brackets is the number of accepted species
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- Mollusca (132 754)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (24 992)
- Class Caudofoveata (143)
- Class Cephalopoda (1 832)
- Class Conchifera accepted as Bivalvia
- Class Cricoconarida † (1)
- Class Gastropoda (102 679)
- Subclass Amphigastropoda † (387)
- Subclass Angiogastropoda represented as Gastropoda
- Subclass Apogastropoda
- Subclass Caenogastropoda (53 623)
- Subterclass Sorbeoconcha (147)
- Superorder Hypsogastropoda
- Order Architaenioglossa (4 917)
- Order Caenogastropoda incertae sedis (7 675)
- Order Littorinimorpha (17 171)
- 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 (1 279)
- 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 (2 309)
- 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)
- 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)
- Genus Cadium Link, 1807 accepted as Tonna Brünnich, 1771
- Genus Cadus Röding, 1798 accepted as Tonna Brünnich, 1771
- Genus Doliopsis Monterosato, 1872 accepted as Eudolium Dall, 1889
- Genus Dolium Lamarck, 1801 accepted as Tonna Brünnich, 1771
- Genus Eudolium Dall, 1889 (9)
- Genus Foratidolium Rovereto, 1899 accepted as Tonna Brünnich, 1771
- Genus Macgillivrayia Forbes, 1852 accepted as Tonna Brünnich, 1771
- Genus Malea Valenciennes, 1832 (12)
- Genus Parvitonna Iredale, 1931 accepted as Tonna Brünnich, 1771
- Genus Perdix Montfort, 1810 accepted as Tonna Brünnich, 1771
- Genus Quimalea Iredale, 1929 accepted as Malea Valenciennes, 1832
- Genus Tonna Brünnich, 1771 (30)
- Subgenus Tonna (Cadus) Röding, 1798 accepted as Tonna Brünnich, 1771
- Subgenus Tonna (Eudolium) Dall, 1889 accepted as Eudolium Dall, 1889
- Subgenus Tonna (Malea) Valenciennes, 1832 accepted as Malea Valenciennes, 1832
- Species Tonna (Malea) densecostata Rutsch, 1934 † accepted as Malea densecostata (Rutsch, 1934) †
- Species Tonna (Malea) pomum (Linnaeus, 1758) accepted as Malea pomum (Linnaeus, 1758)
- Subspecies Tonna (Malea) pomum macgregori (Iredale, 1931) accepted as Malea pomum (Linnaeus, 1758)
- Subspecies Tonna (Malea) pomum pomum (Linnaeus, 1758) accepted as Malea pomum (Linnaeus, 1758)
- Species Tonna (Malea) ringens (Swainson, 1822) accepted as Malea ringens (Swainson, 1822)
- Subgenus Tonna (Tonna) Brünnich, 1771 accepted as Tonna Brünnich, 1771
- Species Tonna alanbeui Vos, 2005
- Species Tonna allium (Dillwyn, 1817)
- Species Tonna ampullacea (R. A. Philippi, 1845)
- Species Tonna berthae Vos, 2005
- Species Tonna boucheti Vos, 2005
- Species Tonna bozzettii T. Cossignani, 2021
- Species Tonna canaliculata (Linnaeus, 1758)
- Species Tonna cepa (Röding, 1798) accepted as Tonna canaliculata (Linnaeus, 1758)
- Species Tonna cerevisina Hedley, 1919 accepted as Tonna tankervillii (Hanley, 1860)
- Species Tonna chinensis (Dillwyn, 1817)
- Species Tonna costata (Menke, 1828) accepted as Tonna allium (Dillwyn, 1817)
- Species Tonna cumingii (Reeve, 1849)
- Species Tonna deshayesii (Reeve, 1849)
- Species Tonna dolium (Linnaeus, 1758)
- Species Tonna dunkeri (Hanley, 1860)
- Species Tonna fasciata (Bruguière, 1789) accepted as Tonna sulcosa (Born, 1778)
- Species Tonna favannii (Hanley, 1860) accepted as Tonna luteostoma (Küster, 1857)
- Species Tonna fimbriata (G. B. Sowerby I, 1827) accepted as Tonna allium (Dillwyn, 1817)
- Species Tonna galea (Linnaeus, 1758)
- Species Tonna hardyi Bozzetti & Ferrario, 2005 accepted as Tonna allium (Dillwyn, 1817)
- Species Tonna haurakiensis Hedley, 1919 accepted as Tonna tankervillii (Hanley, 1860)
- Species Tonna hawaiiensis Vos, 2007
- Species Tonna lischkeana (Küster, 1857)
- Species Tonna luteostoma (Küster, 1857)
- Species Tonna maculata (Lamarck, 1822) accepted as Tonna tessellata (Lamarck, 1816)
- Species Tonna maculosa (Dillwyn, 1817) accepted as Tonna pennata (Mörch, 1853)
- Species Tonna maoria A. W. B. Powell, 1938 accepted as Tonna cumingii (Reeve, 1849)
- Species Tonna marginata (Philippi, 1845) accepted as Dolium marginatum Philippi, 1845
- Species Tonna melanostoma (J. C. Jay, 1839)
- Species Tonna morrisoni Vos, 2005
- Species Tonna niasensis Wissema, 1947 † accepted as Tonna sulcosa (Born, 1778)
- Species Tonna oentoengi Vos, 2005
- Species Tonna olearium (Linnaeus, 1758) accepted as Tonna galea (Linnaeus, 1758)
- Species Tonna parvula (Tapparone Canefri, 1878) accepted as Tonna tessellata (Lamarck, 1816)
- Species Tonna pennata (Mörch, 1853)
- Species Tonna perdix (Linnaeus, 1758)
- Species Tonna planicostata Dodge, 1956 accepted as Tonna canaliculata (Linnaeus, 1758)
- Species Tonna poppei Vos, 2005
- Species Tonna pyriformis (G. B. Sowerby III, 1914) accepted as Eudolium crosseanum (Monterosato, 1869)
- Species Tonna rosemaryae Vos, 1999
- Species Tonna sulcosa (Born, 1778)
- Species Tonna tankervillii (Hanley, 1860)
- Species Tonna tenebrosa (Hanley, 1860)
- Species Tonna tessellata (Lamarck, 1816)
- Species Tonna tetracotula Hedley, 1919
- Species Tonna variegata (Lamarck, 1822)
- Species Tonna zonata (Green, 1830)
- 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 (23 713)
- Order Stenoglossa accepted as Neogastropoda
- Subclass Gastropoda incertae sedis (308)
- Subclass Heterobranchia (39 154)
- 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
