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)
- Order Neogastropoda (23 752)
- Superfamily Buccinoidea Rafinesque, 1815 (5 255)
- 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) (92)
- 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)
- 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)
- Genus Aciculina A. Adams, 1853 accepted as Nassarius (Aciculina) A. Adams, 1853
- Genus Alectrion Montfort, 1810 accepted as Nassarius Duméril, 1805 (2)
- Subgenus Alectrion (Hima) [sic] accepted as Hinia Leach, 1847
- Subgenus Alectrion (Phrontis) H. Adams & A. Adams, 1853 accepted as Nassarius (Phrontis) H. Adams & A. Adams, 1853
- Subgenus Alectrion (Tritia) A. Adams, 1853 accepted as Tritia Risso, 1826
- Subgenus Alectrion (Zeuxis) H. Adams & A. Adams, 1853 accepted as Nassarius (Zeuxis) H. Adams & A. Adams, 1853
- Species Alectrion alumensis (Olsson, 1916) †
- Species Alectrion brassica Maury, 1925 †
- Species Alectrion brassoensis Mansfield, 1925 †
- Species Alectrion capensis (Dunker, 1846) accepted as Nassarius capensis (Dunker, 1846)
- Species Alectrion consensa (Ravenel, 1861) accepted as Alectrion consensus (Ravenel, 1861)
- Species Alectrion consensus (Ravenel, 1861) accepted as Nassarius consensus (Ravenel, 1861)
- Species Alectrion cornelliana (Olsson, 1914) †
- Species Alectrion crawfordi (G. B. Sowerby III, 1892) accepted as Nassarius kochianus (Dunker, 1846)
- Species Alectrion dissimilis (R. B. Watson, 1886) accepted as Nassarius ephamillus (R. B. Watson, 1882)
- Species Alectrion edwardsi (P. Fischer, 1882) accepted as Nassarius turulosus (Risso, 1826)
- Species Alectrion ephamillus (R. B. Watson, 1882) accepted as Nassarius ephamillus (R. B. Watson, 1882)
- Species Alectrion floridana Mansfield, 1930 †
- Species Alectrion gardnerae Dall, 1915 † accepted as Phyllonotus trophoniformis (Heilprin, 1887) †
- Species Alectrion gaudiosus (Hinds, 1844) accepted as Nassarius gaudiosus (Hinds, 1844)
- Species Alectrion glans (Linnaeus, 1758) accepted as Nassarius glans (Linnaeus, 1758)
- Species Alectrion grammatus Dall, 1917 † accepted as Nassarius grammatus (Dall, 1917) †
- Species Alectrion insculptus (P. P. Carpenter, 1864) accepted as Nassarius insculptus (P. P. Carpenter, 1864)
- Variety Alectrion insculptus var. eupleura Dall, 1917 accepted as Nassarius insculptus (P. P. Carpenter, 1864)
- Species Alectrion kochianus (Dunker, 1846) accepted as Nassarius kochianus (Dunker, 1846)
- Species Alectrion kraussianus (Dunker, 1846) accepted as Nassarius kraussianus (Dunker, 1846)
- Species Alectrion latecostatus Suter, 1917 † accepted as Austrofusus latecostatus (Suter, 1917) †
- Species Alectrion limacinus Dall, 1917 accepted as Nassarius limacinus (Dall, 1917)
- Species Alectrion mendicus (A. Gould, 1850) accepted as Nassarius mendicus (A. Gould, 1850)
- Species Alectrion oldroydae Dall & Ochsner, 1928 †
- Species Alectrion onchodes Dall, 1917 accepted as Nassarius onchodes (Dall, 1917)
- Species Alectrion papillosus (Linnaeus, 1758) accepted as Nassarius papillosus (Linnaeus, 1758)
- Species Alectrion plicosa (Dunker, 1846) accepted as Nassarius speciosus (A. Adams, 1852)
- Species Alectrion polistes Dall, 1917 accepted as Nassarius polistes (Dall, 1917)
- Species Alectrion pyramidalis (A. Adams, 1853) accepted as Nassarius pyramidalis (A. Adams, 1853)
- Species Alectrion quadridentata Mansfield, 1930 †
- Species Alectrion quantulus (A. Gould, 1860) accepted as Nassarius quantulus (A. Gould, 1860)
- Species Alectrion socialis (F. W. Hutton, 1885) † accepted as Nassarius socialis (F. W. Hutton, 1885) †
- Species Alectrion spiratus (A. Adams, 1852) accepted as Nassarius spiratus (A. Adams, 1852)
- Species Alectrion splendidulus (Dunker, 1846) accepted as Nassarius splendidulus (Dunker, 1846)
- Species Alectrion sufflatus (A. Gould, 1860) accepted as Nassarius sufflatus (A. Gould, 1860)
- Species Alectrion tropicalis Dall & Ochsner, 1928 †
- Species Alectrion victorianus Iredale, 1915 accepted as Nassarius pyrrhus (Menke, 1843)
- Genus Alectryon Berthold, 1827 accepted as Nassarius (Alectrion) Montfort, 1810
- Genus Allanassa Iredale, 1929 accepted as Nassarius Duméril, 1805
- Genus Amycla H. Adams & A. Adams, 1853 accepted as Tritia Risso, 1826
- Genus Amyclina Iredale, 1918 accepted as Tritia Risso, 1826
- Genus Arcularia Link, 1807 accepted as Nassarius Duméril, 1805
- Genus Arculia Jousseaume, 1888 accepted as Arcularia Link, 1807
- Genus Austronassaria C. Laseron & J. Laseron, 1956 accepted as Nassarius Duméril, 1805
- Genus Bathynassa Ladd, 1976 † accepted as Nassarius Duméril, 1805
- Genus Bilinassa Jousseaume, 1894 accepted as Tritia Risso, 1826
- Genus Buccitriton Conrad, 1865 †
- Genus Caesia H. Adams & A. Adams, 1853 (4)
- Genus Cencus Gistel, 1848 accepted as Cyclope Risso, 1826
- Genus Chelenassa Shuto, 1969 † accepted as Nassarius (Plicarcularia) Thiele, 1929
- Genus Cyclonassa Swainson, 1840 accepted as Cyclope Risso, 1826
- Genus Cyclope Risso, 1826 accepted as Tritia Risso, 1826
- Genus Cyclops Montfort, 1810 accepted as Cyclope Risso, 1826
- Genus Demoulea [sic] accepted as Demoulia Gray, 1838
- Genus Demoulia Gray, 1838 (8)
- Genus Demoulinsia accepted as Demoulia Gray, 1838
- Genus Desmoulea accepted as Demoulia Gray, 1838
- Genus Desmoulinsia accepted as Demoulia Gray, 1838
- Genus Eione Risso, 1826 accepted as Nassarius (Plicarcularia) Thiele, 1929
- Genus Glabrinassa Shuto, 1969 accepted as Nassarius (Zeuxis) H. Adams & A. Adams, 1853
- Genus Hebra H. Adams & A. Adams, 1853 accepted as Nassarius Duméril, 1805
- Genus Hima [sic] accepted as Tritia Risso, 1826
- Genus Hinia Leach, 1847 accepted as Tritia Risso, 1826
- Genus Ilyanassa W. Stimpson, 1865 (3)
- Genus Leptarius Woodring, 1964 † accepted as Psilarius Woodring, 1964 †
- Genus Mirua Marwick, 1931 † accepted as Tritia Risso, 1826
- Genus Moulinsia Tournouer, 1874 accepted as Demoulia Gray, 1838
- Genus Nana Schumacher, 1817 accepted as Cyclope Risso, 1826
- Genus Nanina Risso, 1826 accepted as Cyclope Risso, 1826
- Genus Nassa Lamarck, 1799 accepted as Tritia Risso, 1826 (2)
- Genus Nassarius Duméril, 1805 (508)
- Genus Nassodonta H. Adams, 1867 (2)
- Genus Naytia H. Adams & A. Adams, 1853 (6)
- Genus Naytiopsis Thiele, 1929 accepted as Tritia Risso, 1826
- Genus Neritula H. Adams & A. Adams, 1853 accepted as Cyclope Risso, 1826
- Genus Niotha H. Adams & A. Adams, 1853 accepted as Nassarius (Niotha) H. Adams & A. Adams, 1853
- Genus Pallacera Woodring, 1964 accepted as Nassarius (Pallacera) Woodring, 1964
- Genus Panormella O. G. Costa, 1840 accepted as Cyclope Risso, 1826
- Genus Parcanassa Iredale, 1936 accepted as Tritia Risso, 1826
- Genus Phrontis H. Adams & A. Adams, 1853 (14)
- Genus Plicarcularia Thiele, 1929 accepted as Nassarius (Plicarcularia) Thiele, 1929
- Genus Profundinassa Thiele, 1929 accepted as Nassarius (Profundinassa) Thiele, 1929
- Genus Proneritula Thiele, 1929 accepted as Tritia Risso, 1826
- Genus Psilarius Woodring, 1964 † (4)
- Genus Pygmaeonassa Annandale, 1924 accepted as Nassarius (Pygmaeonassa) Annandale, 1924
- Genus Reticarcularia Shuto, 1969 accepted as Nassarius (Plicarcularia) Thiele, 1929
- Genus Reticunassa Iredale, 1936 (36)
- Genus Scabronassa Peile, 1939 accepted as Nassarius Duméril, 1805
- Genus Schizopyga Conrad, 1856 accepted as Caesia H. Adams & A. Adams, 1853
- Genus Sphaeronassa Locard, 1886 accepted as Tritia Risso, 1826
- Genus Streptorhega Bronn, 1856 accepted as Demoulia Gray, 1838
- Genus Tarazeuxis Iredale, 1936 accepted as Nassarius Duméril, 1805
- Genus Tavaniotha Iredale, 1936 accepted as Nassarius Duméril, 1805
- Genus Telasco H. Adams & A. Adams, 1853 accepted as Tritia Risso, 1826
- Genus Tritia Risso, 1826 (132)
- Genus Tritonella A. Adams, 1852 accepted as Nassarius (Hima) [sic]
- Genus Uzita H. Adams & A. Adams, 1853 accepted as Tritia Risso, 1826
- Genus Varicinassa Habe, 1946 accepted as Nassarius Duméril, 1805
- Genus Venassa E. von Martens, 1881 accepted as Nassarius (Zeuxis) H. Adams & A. Adams, 1853
- Genus Yemeninassoides Bonfitto, 2024 (1)
- Genus Zeuxis H. Adams & A. Adams, 1853 accepted as Nassarius (Zeuxis) H. Adams & A. Adams, 1853
- 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 (8 696)
- Superfamily Mitroidea Swainson, 1831 (633)
- Superfamily Muricacea accepted as Muricoidea Rafinesque, 1815
- Superfamily Muricoidea Rafinesque, 1815 (2 941)
- Superfamily Neogastropoda incertae sedis (296)
- Superfamily Olivoidea Latreille, 1825 (740)
- Superfamily Pholidotomoidea Cossmann, 1896 † (56)
- 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 (1 253)
- Superfamily Volutoidea Rafinesque, 1815 (3 882)
- 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