Between brackets is the number of accepted species
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- Mollusca (132 791)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (25 009)
- Class Caudofoveata (143)
- Class Cephalopoda (1 834)
- Class Conchifera accepted as Bivalvia
- Class Cricoconarida † (1)
- Class Gastropoda (102 697)
- Subclass Amphigastropoda † (390)
- Subclass Angiogastropoda represented as Gastropoda
- Subclass Apogastropoda
- Subclass Caenogastropoda (53 636)
- Subterclass Sorbeoconcha (147)
- Superorder Hypsogastropoda
- Order Architaenioglossa (4 918)
- Order Caenogastropoda incertae sedis (7 676)
- Order Littorinimorpha (17 179)
- Order Neogastropoda (23 716)
- Superfamily Buccinoidea Rafinesque, 1815 (5 253)
- 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)
- Genus Buccinanops A. d'Orbigny, 1841 (3)
- Subgenus Buccinanops (Perunassa) Olsson, 1932 †
- Species Buccinanops antarctica (Wilckens, 1910) † accepted as Chlanidota antarctica (Wilckens, 1910) †
- Species Buccinanops cochlidium (Dillwyn, 1817)
- Species Buccinanops deformis (P. P. King, 1832) accepted as Buccinastrum deforme (P. P. King, 1832)
- Species Buccinanops duartei Klappenbach, 1961 accepted as Buccinastrum duartei (Klappenbach, 1961)
- Species Buccinanops ellipticum (Whitefield, 1865) † accepted as Anbullina elliptica (Whitfield, 1865) †
- Species Buccinanops globulosum (Kiener, 1834) accepted as Buccinastrum deforme (P. P. King, 1832)
- Species Buccinanops gradatus (Deshayes, 1844) accepted as Buccinanops cochlidium (Dillwyn, 1817)
- Species Buccinanops lamarckii (Kiener, 1834) accepted as Buccinanops cochlidium (Dillwyn, 1817)
- Species Buccinanops latus Pastorino & Simone, 2021
- Species Buccinanops monilifer (Kiener, 1834)
- Species Buccinanops patulum (Deshayes, 1835) † accepted as Ancillopsis patula (Deshayes, 1835) †
- Species Buccinanops paytensis (Kiener, 1834) accepted as Buccinastrum paytense (Kiener, 1834)
- Species Buccinanops uruguayensis (Pilsbry, 1897) accepted as Buccinastrum uruguayense (Pilsbry, 1897)
- Species Buccinanops validus (Dunker, 1852) accepted as Pusionella valida (Dunker, 1852)
- Species Buccinanops vittatus (Linnaeus, 1767) accepted as Bullia vittata (Linnaeus, 1767)
- Genus Buccinastrum Pastorino & Simone, 2021 (4)
- Family Buccinidae Rafinesque, 1815 (512)
- Family Buccinoidea incertae sedis (154)
- Family Buccinulidae H. J. Finlay, 1928 accepted as Tudiclidae Cossmann, 1901
- Family Busyconidae Wade, 1917 (1867) (33)
- Family Cassidulidae Gray, 1854 accepted as Melongenidae Gill, 1871 (1854)
- Family Chauvetiidae Kantor, Fedosov, Kosyan, Puillandre, Sorokin, Kano, R. Clark & Bouchet, 2021 (61)
- Family Colidae J. E. Gray, 1857 (32)
- Family Colubrariidae Dall, 1904 (162)
- Family Columbellidae Swainson, 1840 (1 201)
- Family Cominellidae J. E. Gray, 1857 (76)
- 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 † (15)
- Family Eosiphonidae Kantor, Fedosov, Kosyan, Puillandre, Sorokin, Kano, R. Clark & Bouchet, 2021 (72)
- Family Fasciolariidae Gray, 1853 (883)
- 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) (90)
- Family Nassariidae Iredale, 1916 (1835) (1 083)
- 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 (321)
- 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 (195)
- 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 (8 674)
- Superfamily Mitroidea Swainson, 1831 (633)
- Superfamily Muricacea accepted as Muricoidea Rafinesque, 1815
- Superfamily Muricoidea Rafinesque, 1815 (2 940)
- Superfamily Neogastropoda incertae sedis (296)
- Superfamily Olivoidea Latreille, 1825 (740)
- Superfamily Pholidotomoidea Cossmann, 1896 † (55)
- 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 (1 252)
- Superfamily Volutoidea Rafinesque, 1815 (3 873)
- Order Stenoglossa accepted as Neogastropoda
- Subclass Gastropoda incertae sedis (308)
- Subclass Heterobranchia (39 156)
- 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
