Between brackets is the number of accepted species

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- Mollusca (132 888)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (25 022)
- Class Caudofoveata (143)
- Class Cephalopoda (1 838)
- Class Conchifera accepted as Bivalvia
- Class Cricoconarida † (1)
- Class Gastropoda (102 777)
- Subclass Amphigastropoda † (396)
- Subclass Angiogastropoda represented as Gastropoda
- Subclass Apogastropoda
- Subclass Caenogastropoda (53 684)
- 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)
- 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)
- Subfamily Charoniinae A. W. B. Powell, 1933 accepted as Charoniidae A. W. B. Powell, 1933
- Subfamily Cymatiinae Iredale, 1913 (1854) accepted as Cymatiidae Iredale, 1913 (1854)
- Subfamily Pisanianurinae Warén & Bouchet, 1990 accepted as Laubierinidae Warén & Bouchet, 1990
- Subfamily Ranellinae Gray, 1854 accepted as Ranellidae Gray, 1854
- Genus Ameranella Beu, 1988 † (3)
- Genus Antarctiranella Stilwell, Zinsmeister & Oleinik, 2004 † (1)
- Genus Crassicymatium Beu, 2010 † (1)
- Genus Dissentoma Pilsbry, 1945 accepted as Monoplex G. Perry, 1810
- Genus Eugyrina Dall, 1904 accepted as Ranella Lamarck, 1816
- Genus Gyrina Schumacher, 1817 accepted as Ranella Lamarck, 1816
- Genus Gyrinopsis Dall, 1925 † accepted as Ranella Lamarck, 1816
- Genus Liohindsia Coen, 1947 accepted as Priene H. Adams & A. Adams, 1858
- Genus Mayena Iredale, 1917 accepted as Ranella Lamarck, 1816
- Genus Mediargo Terry, 1968 † accepted as Argobuccinum Herrmannsen, 1846
- Genus Obscuranella Kantor & Harasewych, 2000 (1)
- Genus Priene H. Adams & A. Adams, 1858 (1)
- Genus Ranella Lamarck, 1816 (12)
- Genus Trachytriton Meek, 1864 † (2)
- Species Trachytriton eliseae Schnetler & M. S. Nielsen, 2018 †
- Species Trachytriton vinculum (J. Hall & Meek, 1855) †
- 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 (23 752)
- Order Stenoglossa accepted as Neogastropoda
- Subclass Gastropoda incertae sedis (309)
- Subclass Heterobranchia (39 180)
- 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 (6 783)
- 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