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)
- Order Neogastropoda (23 275)
- Superfamily Buccinoidea Rafinesque, 1815 (5 198)
- Family Alectrionidae Dall, 1908 accepted as Nassariinae Iredale, 1916 (1835)
- Family Anachidae A. N. Golikov & Starobogatov, 1972 accepted as Atiliinae Cossmann, 1901
- Family Arculariidae Iredale, 1915 accepted as Nassariinae Iredale, 1916 (1835)
- Family Austrosiphonidae Cotton & Godfrey, 1938 (58)
- Family Belomitridae Kantor, Puillandre, Rivasseau & Bouchet, 2012 (32)
- Family Beringiidae A. N. Golikov & Starobogatov, 1975 accepted as Beringiinae A. N. Golikov & Starobogatov, 1975
- Family Buccinanopsidae Galindo, Puillandre, Lozouet & Bouchet, 2016 (7)
- Family Buccinidae Rafinesque, 1815 (510)
- Family Buccinoidea incertae sedis (150)
- Family Buccinulidae H. J. Finlay, 1928 accepted as Tudiclidae Cossmann, 1901
- Family Busyconidae Wade, 1917 (1867) (28)
- Family Cassidulidae Gray, 1854 accepted as Melongenidae Gill, 1871 (1854)
- Family Chauvetiidae Kantor, Fedosov, Kosyan, Puillandre, Sorokin, Kano, R. Clark & Bouchet, 2021 (60)
- Family Colidae J. E. Gray, 1857 (32)
- Family Colubrariidae Dall, 1904 (162)
- Family Columbellidae Swainson, 1840 (1 190)
- Family Cominellidae J. E. Gray, 1857 (75)
- Family Cyclopsidae Chenu, 1859 accepted as Nassariinae Iredale, 1916 (1835)
- Family Cyrtulidae MacDonald, 1869 accepted as Fusininae Wrigley, 1927
- Family Dolicholatiridae Kantor, Fedosov, Kosyan, Puillandre, Sorokin, Kano, R. Clark & Bouchet, 2021 (43)
- Family Donovaniidae T. L. Casey, 1904 accepted as Chauvetiidae Kantor, Fedosov, Kosyan, Puillandre, Sorokin, Kano, R. Clark & Bouchet, 2021
- Family Echinofulguridae Petuch, 1994 † (12)
- Family Eosiphonidae Kantor, Fedosov, Kosyan, Puillandre, Sorokin, Kano, R. Clark & Bouchet, 2021 (72)
- Family Fasciolariidae Gray, 1853 (874)
- Family Fulguridae Stoliczka, 1867 accepted as Busyconinae Wade, 1917 (1867)
- Family Galeodidae Thiele, 1925 accepted as Melongenidae Gill, 1871 (1854)
- Family Heligmotomidae Adegoke, 1977 † accepted as Melongenidae Gill, 1871 (1854)
- Family Latiridae Iredale, 1929 accepted as Fasciolariinae Gray, 1853
- Family Melongenidae Gill, 1871 (1854) (88)
- Subfamily Melongeninae Gill, 1871 (1854) accepted as Melongenidae Gill, 1871 (1854) (1)
- Genus Brunneifusus Dekkers, 2018 (3)
- Genus Cassidulus Gray, 1854 accepted as Pugilina Schumacher, 1817
- Genus Cornulina Conrad, 1853 † (6)
- Genus Galeodes Röding, 1798 accepted as Melongena Schumacher, 1817
- Genus Hemifusus Swainson, 1840 (15)
- Genus Lenifusus Dekkers, 2018 accepted as Brunneifusus Dekkers, 2018
- Genus Lomirosa Stephenson, 1941 † (1)
- Genus Mayeria Bellardi, 1873 † (2)
- Genus Melongena Schumacher, 1817 (19)
- Genus Myristica Swainson, 1840 accepted as Volema Röding, 1798
- Genus Palaeatractus Gabb, 1869 † (1)
- Genus Pugilina Schumacher, 1817 (14)
- Genus Saginafusus Wenz, 1943 (2)
- Genus Saturnus Saul & Popenoe, 1993 † (1)
- Genus Semifusus Agassiz, 1846 accepted as Hemifusus Swainson, 1840
- Genus Serrifusus Meek, 1876 †
- Genus Surculofusus É. Vincent, 1895 † (1)
- Genus Sycostoma L. R. Cox, 1931 † (8)
- Genus Sycum Bayle, 1880 † accepted as Sycostoma L. R. Cox, 1931 †
- Genus Taphon H. Adams & A. Adams, 1853 (2)
- Genus Texaficus Garvie, 2013 † (1)
- Species Texaficus obesus Garvie, 2013 †
- Genus Thalessa H. Adams & A. Adams, 1853 accepted as Volema Röding, 1798
- Genus Volegalea Iredale, 1938 (5)
- Genus Volema Röding, 1798 (6)
- Family Nassariidae Iredale, 1916 (1835) (1 075)
- Family Neptuneidae W. Stimpson, 1865 accepted as Neptuneinae W. Stimpson, 1865
- Family Peristerniidae Tryon, 1880 accepted as Peristerniinae Tryon, 1880
- Family Pisaniidae J. E. Gray, 1857 (314)
- Family Prodotiidae Kantor, Fedosov, Kosyan, Puillandre, Sorokin, Kano, R. Clark & Bouchet, 2021 (27)
- Family Prosiphonidae A. W. B. Powell, 1951 (165)
- Family Pusiostomatidae Iredale, 1940 accepted as Pisaniidae J. E. Gray, 1857
- Family Pyrenidae Suter, 1909 accepted as Atiliinae Cossmann, 1901
- Family Retimohniidae Kantor, Fedosov, Kosyan, Puillandre, Sorokin, Kano, R. Clark & Bouchet, 2021 (31)
- Family Tudiclidae Cossmann, 1901 (193)
- Family Volemidae Winckworth, 1945 accepted as Melongenidae Gill, 1871 (1854)
- Superfamily Cancellarioidea Forbes & Hanley, 1851 accepted as Volutoidea Rafinesque, 1815
- Superfamily Conoidea J. Fleming, 1822 (8 453)
- Superfamily Mitroidea Swainson, 1831 (621)
- Superfamily Muricacea accepted as Muricoidea Rafinesque, 1815
- Superfamily Muricoidea Rafinesque, 1815 (2 834)
- Superfamily Neogastropoda incertae sedis (295)
- Superfamily Olivoidea Latreille, 1825 (734)
- Superfamily Pholidotomoidea Cossmann, 1896 † (54)
- Superfamily Pseudolivoidea De Gregorio, 1880 accepted as Olivoidea Latreille, 1825
- Superfamily Pyrifusoidea Bandel & Dockery, 2001 † accepted as Pholidotomoidea Cossmann, 1896 †
- Superfamily Sarganoidea Stephenson, 1923 † accepted as Pholidotomoidea Cossmann, 1896 †
- Superfamily Toxoglossa Troschel, 1848 accepted as Conoidea J. Fleming, 1822
- Superfamily Turbinelloidea Swainson, 1835 (1 228)
- Superfamily Volutoidea Rafinesque, 1815 (3 858)
- 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