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)
- Superfamily Cancellarioidea Forbes & Hanley, 1851 accepted as Volutoidea Rafinesque, 1815
- Superfamily Conoidea J. Fleming, 1822 (8 674)
- Family Acusidae J. E. Gray, 1853 accepted as Terebridae Mörch, 1852
- Family Borsoniidae Bellardi, 1875 (571)
- Family Bouchetispiridae Kantor, E. E. Strong & Puillandre, 2012 (2)
- Family Clathurellidae H. Adams & A. Adams, 1858 (334)
- Family Clavatulidae J. E. Gray, 1853 (438)
- Family Clavidae T. L. Casey, 1904 accepted as Drilliidae Olsson, 1964
- Family Clionellidae W. Stimpson, 1865 accepted as Clavatulidae J. E. Gray, 1853
- Family Cochlespiridae A. W. B. Powell, 1942 (114)
- Family Conidae J. Fleming, 1822 (1 393)
- Family Conilithidae J. K. Tucker & M. Tenorio, 2009 accepted as Conidae J. Fleming, 1822
- Family Conoidea incertae sedis (318)
- Family Conorbidae De Gregorio, 1880 (19)
- Family Conusidae J. Fleming, 1822 accepted as Conidae J. Fleming, 1822
- Family Cryptoconidae Cossmann, 1896 † (22)
- Family Drilliidae Olsson, 1964 (769)
- Genus Acinodrillia Kilburn, 1988 (3)
- Genus Agladrillia Woodring, 1928 (26)
- Genus Bellaspira Conrad, 1868 (15)
- Genus Brephodrillia Pilsbry & H. N. Lowe, 1932 accepted as Iredalea W. R. B. Oliver, 1915
- Genus Calliclava J. H. McLean, 1971 (13)
- Genus Cerodrillia Bartsch & Rehder, 1939 (23)
- Genus Clathrodrilla [sic] accepted as Clathrodrillia Dall, 1918
- Genus Clathrodrillia Dall, 1918 (28)
- Genus Clavicantha Swainson, 1840 accepted as Clavus Montfort, 1810
- Genus Clavus Montfort, 1810 (93)
- Genus Conopleura Hinds, 1844 (2)
- Genus Crassopleura Monterosato, 1884 (6)
- Genus Cruziturricula J. G. Marks, 1951 (4)
- Genus Cymatosyrinx Dall, 1889 (11)
- Genus Decoradrillia Fallon, 2016 (5)
- Genus Douglassia Bartsch, 1934 (6)
- Genus Drillia J. E. Gray, 1838 (135)
- Genus Elaeocyma Dall, 1918 (13)
- Genus Eldridgea Bartsch, 1934 accepted as Clavus Montfort, 1810
- Genus Eumetadrillia Woodring, 1928 (3)
- Genus Fenimorea Bartsch, 1934 (28)
- Genus Fusisyrinx Bartsch, 1934 accepted as Fusiturricula Woodring, 1928
- Genus Fusiturricula Woodring, 1928 (19)
- Genus Globidrillia Woodring, 1928 (7)
- Genus Hauturua A. W. B. Powell, 1942 (6)
- Genus Imaclava Bartsch, 1944 (5)
- Genus Iredalea W. R. B. Oliver, 1915 (11)
- Genus Kylix Dall, 1919 (11)
- Genus Leptadrillia Woodring, 1928 (19)
- Genus Lissodrillia Bartsch & Rehder, 1939 (12)
- Genus Neodrillia Bartsch, 1943 (5)
- Genus Nitidiclavus M. P. Bernasconi & Robba, 1984 † (6)
- Genus Orrmaesia Kilburn, 1988 (5)
- Genus Paracuneus Laseron, 1954 (2)
- Genus Plagiostropha Melvill, 1927 (15)
- Genus Pleurofusia De Gregorio, 1890 † (21)
- Genus Sedilia Fargo, 1953 (3)
- Genus Spirotropis G. O. Sars, 1878 (31)
- Genus Splendrillia Hedley, 1922 (133)
- Genus Stenodrillia Korobkov, 1955 (7)
- Species Stenodrillia acestra (Dall, 1889) accepted as Compsodrillia acestra (Dall, 1889)
- Species Stenodrillia allionii (Bellardi, 1875) †
- Species Stenodrillia bellardii (Desmoulins, 1842) †
- Species Stenodrillia eucosmia (Dall, 1889) accepted as Compsodrillia eucosmia (Dall, 1889)
- Species Stenodrillia gundlachi (Dall & C. T. Simpson, 1901) accepted as Compsodrillia gundlachi (Dall & C. T. Simpson, 1901)
- Species Stenodrillia haliostrephis (Dall, 1889) accepted as Compsodrillia haliostrephis (Dall, 1889)
- Species Stenodrillia horrenda (R. B. Watson, 1886)
- Species Stenodrillia inquisitoris Vera-Peláez, 2022 †
- Species Stenodrillia neuvillei (Peyrot, 1931) †
- Species Stenodrillia pseudoneuvillei Lozouet, 2017 †
- Species Stenodrillia scillae (Bellardi, 1877) †
- Genus Syntomodrillia Woodring, 1928 (31)
- Genus Turriclavus M. P. Bernasconi & Robba, 1984 † (3)
- Genus Tylotia Melvill, 1917 accepted as Clavus Montfort, 1810
- Genus Tylotiella T. Habe, 1958 accepted as Clavus Montfort, 1810 (1)
- Genus Wairarapa Vella, 1954 (2)
- Family Fusiturridae Abdelkrim, Aznar-Cormano, Fedosov, Kantor, Lozouet, Phuong, Zaharias & Puillandre, 2018 (19)
- Family Horaiclavidae Bouchet, Kantor, Sysoev & Puillandre, 2011 (315)
- Family Mangeliidae P. Fischer, 1883 (1 064)
- Family Marshallenidae Abdelkrim, Aznar-Cormano, Fedosov, Kantor, Lozouet, Phuong, Zaharias & Puillandre, 2018 (5)
- Family Melatomidae Gill, 1871 accepted as Clavatulidae J. E. Gray, 1853
- Family Mitrolumnidae Sacco, 1904 accepted as Mitromorphidae T. L. Casey, 1904
- Family Mitromorphidae T. L. Casey, 1904 (219)
- Family Pervicaciidae Rudman, 1969 accepted as Terebridae Mörch, 1852
- Family Pleurotomidae J. E. Gray, 1838 accepted as Turridae H. Adams & A. Adams, 1853 (1838)
- Family Pseudomelatomidae J. P. E. Morrison, 1966 (781)
- Family Raphitomidae Bellardi, 1875 (1 158)
- Family Strictispiridae J. H. McLean, 1971 accepted as Pseudomelatomidae J. P. E. Morrison, 1966
- Family Taranteconidae J. K. Tucker & M. Tenorio, 2009 accepted as Conidae J. Fleming, 1822
- Family Terebridae Mörch, 1852 (750)
- Family Thatcheriidae A. W. B. Powell, 1942 accepted as Raphitomidae Bellardi, 1875
- Family Turridae H. Adams & A. Adams, 1853 (1838) (383)
- Subfamily Andoniinae Vera-Peláez, 2002 † accepted as Raphitomidae Bellardi, 1875
- Subfamily Crassispirinae J. H. McLean, 1971 accepted as Pseudomelatomidae J. P. E. Morrison, 1966
- Subfamily Cytharinae Thiele, 1929 accepted as Mangeliidae P. Fischer, 1883
- Subfamily Daphnellinae T. L. Casey, 1904 accepted as Raphitomidae Bellardi, 1875
- Subfamily Diptychomitrinae Bellardi, 1888 accepted as Mitromorphidae T. L. Casey, 1904
- Subfamily Oenopotinae Bogdanov, 1987 accepted as Mangeliidae P. Fischer, 1883
- Subfamily Pleurotomellinae F. Nordsieck, 1968 accepted as Raphitomidae Bellardi, 1875
- Subfamily Pseudotominae Bellardi, 1875 accepted as Borsoniidae Bellardi, 1875
- Subfamily Pusionellinae J. E. Gray, 1853 accepted as Clavatulidae J. E. Gray, 1853
- Subfamily Taraninae T. L. Casey, 1904 accepted as Raphitomidae Bellardi, 1875
- Subfamily Turriculinae A. W. B. Powell, 1942 accepted as Clavatulidae J. E. Gray, 1853
- Subfamily Zemaciinae Sysoev, 2003 accepted as Borsoniidae Bellardi, 1875
- Subfamily Zonulispirinae J. H. McLean, 1971 accepted as Pseudomelatomidae J. P. E. Morrison, 1966
- 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