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)
- 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)
- Genus Abyssocomitas Sysoev & Kantor, 1986 (1)
- Genus Aguilaria J. D. Taylor & F. E. Wells, 1994 (1)
- Genus Anticomitas A. W. B. Powell, 1942 (1)
- Genus Antimelatoma A. W. B. Powell, 1942 (2)
- Genus Antiplanes Dall, 1902 (23)
- Genus Aquilaria J. D. Taylor & F. E. Wells, 1994 accepted as Aguilaria J. D. Taylor & F. E. Wells, 1994
- Genus Benthodaphne Oyama, 1962 (1)
- Genus Boreocomitas Hickman, 1976 † (4)
- Genus Brachytoma Swainson, 1840 (5)
- Genus Burchia Bartsch, 1944 (2)
- Genus Buridrillia Olsson, 1942 (3)
- Genus Calcatodrillia Kilburn, 1988 (2)
- Genus Carinodrillia Dall, 1919 (17)
- Genus Carinoturris Bartsch, 1944 (3)
- Genus Cheungbeia J. D. Taylor & F. E. Wells, 1994 (4)
- Genus Clavatoma A. W. B. Powell, 1942 † (1)
- Genus Cleospira J. H. McLean, 1971 (1)
- Genus Comitas H. J. Finlay, 1926 (88)
- Genus Compsodrillia Woodring, 1928 (32)
- Genus Conorbela A. W. B. Powell, 1951 (1)
- Genus Conticosta Laseron, 1954 (1)
- Genus Crassiclava J. H. McLean, 1971 (3)
- Genus Crassispira Swainson, 1840 (219)
- Genus Cretaspira Kuroda & Oyama, 1971 (1)
- Genus Dallspira Bartsch, 1950
- Genus Doxospira J. H. McLean, 1971 (1)
- Genus Epidirella Iredale, 1931 (2)
- Genus Funa Kilburn, 1988 (12)
- Genus Hindsiclava Hertlein & A. M. Strong, 1955 (15)
- Genus Hormospira S. S. Berry, 1958 (1)
- Genus Inquisitor Hedley, 1918 (94)
- Genus Integradrillia A. W. B. Powell, 1942 † (1)
- Genus Kantoria Landau & Harzhauser, 2023 † (5)
- Genus Knefastia Dall, 1919 (16)
- Genus Kurilohadalia Sysoev & Kantor, 1986 (2)
- Genus Kurodadrillia M. Azuma, 1975 (1)
- Genus Leucosyrinx Dall, 1889 (37)
- Genus Lioglyphostoma Woodring, 1928 (12)
- Genus Lioglyphostomella Shuto, 1970 accepted as Otitoma Jousseaume, 1898
- Genus Macrosinus Beu, 1970 accepted as Paracomitas (Macrosinus) Beu, 1970
- Genus Maesiella J. H. McLean, 1971 (4)
- Genus Megasurcula T. L. Casey, 1904 (7)
- Genus Meggittia H. C. Ray, 1977 (1)
- Genus Miraclathurella Woodring, 1928 (9)
- Genus Monilispira Bartsch & Rehder, 1939 (5)
- Genus Naudedrillia Kilburn, 1988 (8)
- Genus Otitoma Jousseaume, 1898 (35)
- Genus Paracomitas A. W. B. Powell, 1942 (8)
- Subgenus Paracomitas (Macrosinus) Beu, 1970 represented as Paracomitas A. W. B. Powell, 1942
- Subgenus Paracomitas (Paracomitas) A. W. B. Powell, 1942 represented as Paracomitas A. W. B. Powell, 1942
- Species Paracomitas augusta (Murdoch & Suter, 1906)
- Species Paracomitas beui P. A. Maxwell, 1988 †
- Species Paracomitas flemingi (Beu, 1970) †
- Species Paracomitas gemmea (Murdoch, 1900) †
- Species Paracomitas gypsata (R. B. Watson, 1881) accepted as Gymnobela gypsata (R. B. Watson, 1881)
- Species Paracomitas haumuria Beu, 1979
- Species Paracomitas protransenna (P. Marshall & Murdoch, 1923) †
- Species Paracomitas rodgersi MacNeil, 1961 †
- Species Paracomitas undosa (Schepman, 1913)
- Genus Pilsbryspira Bartsch, 1950 (25)
- Genus Plicisyrinx Sysoev & Kantor, 1986 (4)
- Genus Pseudomelatoma Dall, 1918 (5)
- Genus Pseudotaranis J. H. McLean, 1995 (2)
- Genus Ptychobela Thiele, 1925 (16)
- Genus Pyrgospira J. H. McLean, 1971 (5)
- Genus Rectiplanes Bartsch, 1944 accepted as Antiplanes Dall, 1902
- Genus Rectisulcus Habe, 1958 accepted as Antiplanes Dall, 1902
- Genus Rhodopetoma Bartsch, 1944 (3)
- Genus Schepmania Shuto, 1970 accepted as Shutonia van der Bijl, 1993
- Genus Sediliopsis Petuch, 1988 (5)
- Genus Shutonia van der Bijl, 1993 (1)
- Genus Strictispira J. H. McLean, 1971 (8)
- Genus Striospira Bartsch, 1950 accepted as Crassispira Swainson, 1840
- Genus Thelecythara Woodring, 1928 (4)
- Genus Thelecytharella Shuto, 1969 accepted as Otitoma Jousseaume, 1898
- Genus Thelycytharella auctt accepted as Thelecytharella Shuto, 1969
- Genus Tiariturris S. S. Berry, 1958 (2)
- Genus Turrigemma S. S. Berry, 1958 accepted as Hindsiclava Hertlein & A. M. Strong, 1955
- Genus Viridrillia Bartsch, 1943 (4)
- Genus Viridrillina Bartsch, 1943 accepted as Viridrillia Bartsch, 1943
- Genus Vixinquisitor A. W. B. Powell, 1942 † (1)
- Genus Zonulispira Bartsch, 1950 (4)
- 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