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)
- Order Neogastropoda (23 713)
- 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)
- 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)
- Subfamily Anentominae E. E. Strong, Galindo & Kantor, 2017 (20)
- Subfamily Buccinanopsinae Galindo, Puillandre, Lozouet & Bouchet, 2016 accepted as Buccinanopsidae Galindo, Puillandre, Lozouet & Bouchet, 2016
- Subfamily Bulliinae Allmon, 1990 (47)
- Subfamily Cyclonassinae Gill, 1871 accepted as Nassariinae Iredale, 1916 (1835)
- Subfamily Cylleninae Bellardi, 1882 (29)
- Genus Cyllene J. E. Gray, 1834 (28)
- Subgenus Cyllene (Cyllene) J. E. Gray, 1834 represented as Cyllene J. E. Gray, 1834
- Subgenus Cyllene (Cyllenina) Bellardi, 1882 † accepted as Cyllenina Bellardi, 1882 †
- Species Cyllene angsanana K. Martin, 1921 †
- Species Cyllene cernohorskyi F. Fernandes & Rolán, 1992
- Species Cyllene chelonia Lorenz, 2023
- Species Cyllene concinna A. Adams, 1851
- Species Cyllene degrangei Peyrot, 1927 † accepted as Cyllene desnoyersi (Basterot, 1825) †
- Species Cyllene desnoyersi (Basterot, 1825) †
- Species Cyllene fuscata A. Adams, 1851
- Species Cyllene gibba A. Adams, 1870
- Species Cyllene glabrata A. Adams, 1851 accepted as Cyllene pulchella A. Adams & Reeve, 1850
- Species Cyllene gracilenta (Yokoyama, 1928) †
- Species Cyllene grayi Reeve, 1846
- Species Cyllene helvetica Peyrot, 1927 † accepted as Cyllenina helvetica (Peyrot, 1927) †
- Species Cyllene incisa Oostingh, 1939 †
- Species Cyllene japonica Pilsbry, 1904
- Species Cyllene lactea A. Adams & Angas, 1864
- Species Cyllene lamarcki Cernohorsky, 1975
- Species Cyllene lugubris A. Adams & Reeve, 1850
- Species Cyllene lyrata (Lamarck, 1822) accepted as Cyllene desnoyersi lamarcki Cernohorsky, 1975
- Species Cyllene oblonga Schepman, 1911
- Species Cyllene orientalis A. Adams, 1851
- Species Cyllene owenii J. E. Gray, 1834
- Species Cyllene pallida A. Adams, 1851 accepted as Cyllene fuscata A. Adams, 1851
- Species Cyllene parvula Bozzetti, 2014
- Species Cyllene plumbea G. B. Sowerby II, 1859 accepted as Cyllene fuscata A. Adams, 1851
- Species Cyllene pretiosa Vredenburg, 1924 †
- Species Cyllene pulchella A. Adams & Reeve, 1850
- Species Cyllene pumila (Tate, 1888) †
- Species Cyllene royana (Iredale, 1924)
- Species Cyllene rubrolineata G. B. Sowerby II, 1870
- Species Cyllene satoi Amano, 2019 †
- Species Cyllene senegalensis Petit de la Saussaye, 1853 accepted as Cyllene owenii J. E. Gray, 1834
- Species Cyllene sibogae Schepman, 1911
- Species Cyllene smithi K. Martin, 1884 †
- Species Cyllene striata A. Adams, 1851 accepted as Cyllene pulchella A. Adams & Reeve, 1850
- Species Cyllene sulcata G. B. Sowerby II, 1859
- Species Cyllene sulcata H. Adams & A. Adams, 1854 accepted as Cyllene sulcata G. B. Sowerby II, 1859
- Species Cyllene unimaculata A. Adams, 1855
- Species Cyllene varians Cossmann, 1903 † accepted as Cyllene fuscata A. Adams, 1851
- Species Cyllene vredenburgi B. B. Gupta, 1930 †
- Genus Neoteron Pilsbry & H. N. Lowe, 1932 (1)
- Genus Radulphus Iredale, 1924 accepted as Cyllene J. E. Gray, 1834
- Subfamily Dorsaninae Cossmann, 1901 (73)
- Subfamily Duplicatinae Muskhelishvili, 1967 † accepted as Dorsaninae Cossmann, 1901
- Subfamily Nassariidae incertae sedis (4)
- Subfamily Nassariinae Iredale, 1916 (1835) (722)
- Subfamily Nassinae Swainson, 1835 accepted as Nassariinae Iredale, 1916 (1835)
- Subfamily Photinae J. E. Gray, 1857 (118)
- Subfamily Tomliniinae Kantor, Fedosov, Kosyan, Puillandre, Sorokin, Kano, R. Clark & Bouchet, 2021 (70)
- Genus Sudonassarius Stilwell & Zinsmeister, 1992 † accepted as Chlanidota E. von Martens, 1878
- 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 (8 671)
- 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 (39 154)
- 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