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)
- 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)
- Genus Atractus Agassiz, 1839 accepted as Colus Röding, 1798
- Genus Colicryptus Iredale, 1918 accepted as Turrisipho Dautzenberg & H. Fischer, 1912
- Genus Colus Röding, 1798 (26)
- Genus Kryptos Dautzenberg & H. Fischer, 1896 (2)
- Genus Sipho Mörch, 1852 accepted as Colus Röding, 1798
- Subgenus Sipho (Anomalisipho) Dautzenberg & H. Fischer, 1912 accepted as Anomalisipho Dautzenberg & H. Fischer, 1912
- Subgenus Sipho (Eosipho) Thiele, 1929 accepted as Eosipho Thiele, 1929
- Subgenus Sipho (Mohnia) Friele, 1879 accepted as Mohnia Friele, 1879
- Subgenus Sipho (Parasipho) Dautzenberg & H. Fischer, 1912 accepted as Plicifusus Dall, 1902
- Subgenus Sipho (Siphonorbis) Mörch, 1869 accepted as Colus Röding, 1798
- Subgenus Sipho (Tritonofusus) H. Beck, 1847 accepted as Colus Röding, 1798
- Subgenus Sipho (Turrisipho) Dautzenberg & H. Fischer, 1912 accepted as Turrisipho Dautzenberg & H. Fischer, 1912
- Species Sipho angustus E. A. Smith, 1880
- Species Sipho antarctidis Pelseneer, 1903 accepted as Prosipho antarctidis (Pelseneer, 1903)
- Species Sipho asperulus Tate, 1888 † accepted as Penion asperula (Tate, 1888) †
- Species Sipho astrolabiensis Strebel, 1908 accepted as Prosipho astrolabiensis (Strebel, 1908)
- Species Sipho aurorae Shikama, 1977
- Species Sipho brevispira Brøgger, 1900 accepted as Colus sabini (J. E. Gray, 1824)
- Species Sipho caelatulus A. E. Verrill, 1884 accepted as Retimohnia caelata (A. E. Verrill, 1880)
- Species Sipho caelatus (A. E. Verrill, 1880) accepted as Retimohnia caelata (A. E. Verrill, 1880)
- Species Sipho chordatus Strebel, 1908 accepted as Prosipho chordatus (Strebel, 1908)
- Species Sipho clathratulus Cossmann, 1889 † accepted as Syphopsis clathratula (Cossmann, 1889) †
- Species Sipho columbelloides Cossmann, 1889 † accepted as Columbellisipho columbelloides (Cossmann, 1889) †
- Species Sipho costiferus Posselt & A. S. Jensen, 1898 accepted as Turrisipho lachesis (Mörch, 1869)
- Species Sipho crassifunis Cossmann, 1889 † accepted as Andoniopsis crassifunis (Cossmann, 1889) †
- Species Sipho crebrigranosus Tate, 1888 † accepted as Varicosipho crebrigranosus (Tate, 1888) †
- Species Sipho dalli Friele, 1881 accepted as Mohnia dalli (Friele, 1881)
- Species Sipho esychus (Dall, 1907) accepted as Aulacofusus esychus (Dall, 1907)
- Species Sipho gaini E. Lamy, 1910 accepted as Belaturricula gaini (E. Lamy, 1910)
- Species Sipho geministriatus [sic] accepted as Retifusus latericeus (Møller, 1842)
- Species Sipho geminostriatus G. Pfeffer, 1886 accepted as Retifusus latericeus (Møller, 1842)
- Species Sipho glaber Verkrüzen, 1876 accepted as Colus gracilis (da Costa, 1778)
- Species Sipho glyptus A. E. Verrill, 1882 accepted as Retimohnia glypta (A. E. Verrill, 1882)
- Species Sipho gracilis (da Costa, 1778) accepted as Colus gracilis (da Costa, 1778)
- Species Sipho hallii Dall, 1873 accepted as Latisipho hallii (Dall, 1873)
- Species Sipho hebes A. E. Verrill, 1884 accepted as Retimohnia caelata (A. E. Verrill, 1880)
- Species Sipho hispidulus A. E. Verrill, 1885 accepted as Mohnia abyssorum (P. Fischer, 1884)
- Species Sipho infraeocaenicus Cossmann, 1889 † accepted as Parvisipho infraeocaenicus (Cossmann, 1889) †
- Species Sipho islandicus (Mohr, 1786) accepted as Colus islandicus (Mohr, 1786)
- Species Sipho jonkeri Koperberg, 1931 † accepted as Manaria koperbergae Fraussen & Stahlschmidt, 2016 †
- Species Sipho krampi Thorson, 1951 accepted as Mohnia krampi (Thorson, 1951)
- Species Sipho labrosus Tate, 1888 † accepted as Varicosipho labrosus (Tate, 1888) †
- Species Sipho leptaleus A. E. Verrill, 1884 accepted as Taranis leptalea (A. E. Verrill, 1884)
- Species Sipho lindahli Posselt & A. S. Jensen, 1898 accepted as Retimohnia glypta (A. E. Verrill, 1882)
- Species Sipho loustauae Cossmann, 1889 † accepted as Amplosipho loustauae (Cossmann, 1889) †
- Species Sipho martensi A. Krause, 1885 accepted as Anomalisipho martensi (A. Krause, 1885)
- Species Sipho mimeticus Tate, 1893 accepted as Austrotriton mimeticus (Tate, 1893)
- Species Sipho nodulosus Cossmann, 1889 † accepted as Syphopsis nodulosa (Cossmann, 1889) †
- Species Sipho obesiformis Yokoyama, 1920 † accepted as Colus obesiformis (Yokoyama, 1920) †
- Species Sipho obesus A. E. Verrill, 1884 accepted as Retimohnia caelata (A. E. Verrill, 1880)
- Species Sipho parvus A. E. Verrill & S. Smith, 1882 accepted as Mohnia parva (A. E. Verrill & S. Smith, 1882)
- Species Sipho pezanti Cossmann, 1892 † accepted as Coptosipho pezanti (Cossmann, 1892) †
- Species Sipho plicatus A. Adams, 1864 accepted as Plicifusus kroyeri (Møller, 1842)
- Species Sipho polysarca Cossmann, 1889 † accepted as Syphopsis polysarca (Cossmann, 1889) †
- Species Sipho profundicola A. E. Verrill & S. Smith, 1884 accepted as Mohnia abyssorum (P. Fischer, 1884)
- Variety Sipho profundicola var. dispar A. E. Verrill, 1884 accepted as Mohnia abyssorum (P. Fischer, 1884)
- Species Sipho pubescens A. E. Verrill, 1882 accepted as Colus pubescens (A. E. Verrill, 1882)
- Species Sipho pygmaeus (A. Gould, 1841) accepted as Colus pygmaeus (A. Gould, 1841)
- Species Sipho raristria Cossmann, 1889 † accepted as Syphopsis raristria (Cossmann, 1889) †
- Species Sipho sarsi G. O. Sars, 1878 accepted as Turrisipho moebii (Dunker & Metzger, 1875)
- Species Sipho simplex A. E. Verrill, 1884 accepted as Mohnia simplex (A. E. Verrill, 1884)
- Species Sipho stimpsonii (Mörch, 1868) accepted as Colus stimpsoni (Mörch, 1868)
- Species Sipho tatei Cossmann, 1898 † accepted as Sipho asperulus Tate, 1888 †
- Species Sipho tenuiplicatus Cossmann, 1889 † accepted as Syphopsis tenuiplicata (Cossmann, 1889) †
- Species Sipho togatus (Mörch, 1869) accepted as Colus sabini (J. E. Gray, 1824)
- Species Sipho tortuosus (Reeve, 1855) accepted as Colus holboelli
- Species Sipho turgidulus (Friele, 1877) accepted as Colus turgidulus (Friele, 1877)
- Species Sipho turritus (M. Sars, 1859) accepted as Colus jeffreysianus (P. Fischer, 1868)
- Species Sipho undulatus Friele, 1881 accepted as Turrisipho lachesis (Mörch, 1869)
- Species Sipho valdeconicus Cossmann, 1896 † accepted as Parvisipho valdeconicus (Cossmann, 1896) †
- Species Sipho venemai Koperberg, 1931 accepted as Manaria venemai (Koperberg, 1931) †
- Species Sipho verkruezeni Kobelt, 1876 accepted as Anomalisipho verkruezeni (Kobelt, 1876)
- Species Sipho verkrüzeni Kobelt, 1876 accepted as Sipho verkruezeni Kobelt, 1876
- Genus Siphonorbis Mörch, 1869 accepted as Colus Röding, 1798
- Genus Tritonofusus Beck, 1847 accepted as Colus Röding, 1798
- Genus Turrisipho Dautzenberg & H. Fischer, 1912 (4)
- 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