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)
- Subfamily Argobuccininae Kilias, 1973
- Genus Afrocanidea Connolly, 1929 accepted as Gutturnium Mörch, 1852
- Genus Apollon Montfort, 1810 accepted as Gyrineum Link, 1807
- Genus Aquillus Montfort, 1810 accepted as Cabestana Röding, 1798
- Genus Argobuccinum Herrmannsen, 1846 (2)
- Genus Austrosassia H. J. Finlay, 1931 (8)
- Genus Austrotriton Cossmann, 1903 (17)
- Genus Biplex Perry, 1810 accepted as Gyrineum Link, 1807
- Genus Cabestana Röding, 1798 (7)
- Genus Cabestanimorpha Iredale, 1936 accepted as Monoplex G. Perry, 1810
- Species Cabestanimorpha euclia Cotton, 1945 accepted as Monoplex exaratus (Reeve, 1844)
- Genus Cassitriton Craig & Tracey, 2020 † (1)
- Genus Charoniella Thiele, 1929 accepted as Austrotriton Cossmann, 1903
- Genus Charoniella A. W. B. Powell & Bartrum, 1929 accepted as Proxicharonia A. W. B. Powell, 1938
- Genus Cryotritonium E. von Martens, 1904 accepted as Fusitriton Cossmann, 1903
- Genus Cymatiella Iredale, 1924 (22)
- Genus Cymatilesta Iredale, 1936 accepted as Cabestana Röding, 1798
- Genus Cymatium Röding, 1798 (6)
- Genus Cymatona Iredale, 1929 (2)
- Genus Distorsomina Beu, 1998 (1)
- Genus Dolarium Schlüter, 1838 accepted as Cabestana Röding, 1798
- Genus Eocymatium Beu, 1988 † (1)
- Genus Eusassia Craig & Tracey, 2020 † (2)
- Genus Fusitriton Cossmann, 1903 (8)
- Genus Gelagna Schaufuss, 1869 (2)
- Genus Gondwanula Finlay, 1926 accepted as Argobuccinum Herrmannsen, 1846
- Genus Gutturnium Mörch, 1852 (1)
- Genus Gyrinella Dall, 1924 accepted as Gyrineum Link, 1807
- Genus Gyrineum Link, 1807 (23)
- Genus Halgyrineum Beu, 1998 (1)
- Genus Haurokoa C. A. Fleming, 1955 † (3)
- Genus Lampusia Schumacher, 1817 accepted as Monoplex G. Perry, 1810
- Genus Linatella Gray, 1857 (2)
- Genus Lotoria W. K. Emerson & Old, 1963 (4)
- Genus Lotorium Montfort, 1810 accepted as Cymatium Röding, 1798
- Genus Luterium Herrmannsen, 1847 accepted as Cymatium Röding, 1798
- Genus Microsassia Craig & Tracey, 2020 † (1)
- Genus Microtriton Craig & Tracey, 2020 † (3)
- Genus Monocirsus Cossmann, 1889 † accepted as Sassia Bellardi, 1873
- Genus Monoplex G. Perry, 1810 (45)
- Genus Nassitriton Craig & Tracey, 2020 † (2)
- Genus Negyrina Iredale, 1929 accepted as Austrotriton Cossmann, 1903
- Genus Neptunella Gray, 1854 accepted as Cabestana Röding, 1798
- Genus Paralagena Dall, 1904 accepted as Gelagna Schaufuss, 1869
- Genus Parasassia Craig & Tracey, 2020 † (10)
- Genus Particymatium Iredale, 1936 accepted as Turritriton Dall, 1904
- Genus Personella Conrad, 1865 (2)
- Genus Phanozesta Iredale, 1936 accepted as Sassia Bellardi, 1873
- Genus Planitriton Craig & Tracey, 2020 † (1)
- Genus Protoplex Craig & Tracey, 2020 † (3)
- Genus Proxicharonia A. W. B. Powell, 1938 (2)
- Genus Pseudosassia Vicián & Z. Kovács, 2022 † (16)
- Genus Ranularia Schumacher, 1817 (26)
- Genus Reticutriton Habe & Kosuge, 1966 (4)
- Genus Retusum Jousseaume, 1892 accepted as Ranularia Schumacher, 1817
- Genus Sassia Bellardi, 1873 (34)
- Genus Sassiella Craig & Tracey, 2020 † (14)
- Genus Sassoia Rovereto, 1900 accepted as Sassia Bellardi, 1873
- Genus Septa G. Perry, 1810 (13)
- Genus Simpulum Mörch, 1852 accepted as Septa G. Perry, 1810
- Genus Tritocurrus R. P. Lesson, 1842 accepted as Cymatium Röding, 1798
- Genus Tritoniscus Dall, 1904 accepted as Turritriton Dall, 1904
- Genus Tritonocauda Dall, 1904 accepted as Ranularia Schumacher, 1817
- Genus Turritriton Dall, 1904 (8)
- Genus Vernotriton Iredale, 1936 accepted as Cymatiella Iredale, 1924
- 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 (23 713)
- 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