Between brackets is the number of accepted species

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- Mollusca (132 708)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (24 984)
- Class Caudofoveata (143)
- Class Cephalopoda (1 827)
- Class Conchifera accepted as Bivalvia
- Class Cricoconarida † (1)
- Class Gastropoda (102 646)
- Subclass Amphigastropoda † (387)
- Subclass Angiogastropoda represented as Gastropoda
- Subclass Apogastropoda
- Subclass Caenogastropoda (53 590)
- Subterclass Sorbeoconcha (147)
- Superorder Hypsogastropoda
- Order Architaenioglossa (4 916)
- Order Caenogastropoda incertae sedis (7 676)
- Order Littorinimorpha (17 166)
- Order Neogastropoda (23 685)
- Superfamily Buccinoidea Rafinesque, 1815 (5 253)
- 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 (2 912)
- 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)
- Family Cancellariidae Forbes & Hanley, 1851 (855)
- Subfamily Admetinae Troschel, 1865 (129)
- Subfamily Cancellariinae Forbes & Hanley, 1851 (284)
- Subfamily Plesiotritoninae Beu & P. A. Maxwell, 1987 (87)
- Subfamily Trigonostomatinae Cossmann, 1899 accepted as Cancellariinae Forbes & Hanley, 1851
- Genus Admetula Cossmann, 1889 (34)
- Genus Anapepta H. J. Finlay, 1930 accepted as Brocchinia Jousseaume, 1887
- Genus Aneurystoma Cossmann, 1899 † (3)
- Genus Arizelostoma Iredale, 1936 accepted as Trigonostoma Blainville, 1827
- Genus Axelella Petit, 1988 (13)
- Genus Babylonella Conrad, 1865 † (2)
- Genus Bivetia Jousseaume, 1887 accepted as Cancellaria Lamarck, 1799
- Genus Bivetiella Wenz, 1943 (9)
- Genus Bivetopsia Jousseaume, 1887 (4)
- Genus Calcarata Jousseaume, 1887 † (5)
- Genus Cancellaphera Iredale, 1930 (3)
- Genus Charcolleria Olsson, 1942 † accepted as Massyla H. Adams & A. Adams, 1854
- Genus Coptostomella H. J. Finlay & Marwick, 1937 † (2)
- Genus Crawfordia Dall, 1918 accepted as Crawfordina Dall, 1919
- Genus Crawfordina Dall, 1919
- Genus Egerea Gábor, 1936 † (1)
- Genus Euclia H. Adams & A. Adams, 1854 (8)
- Genus Extractrix Korobkov, 1955 accepted as Trigonostoma Blainville, 1827
- Genus Fusiaphera Habe, 1961 (9)
- Genus Gerdiella Olsson & Bayer, 1973 (4)
- Genus Gergovia Cossmann, 1899 † (2)
- Genus Gulia Jousseaume, 1887 (4)
- Genus Habesolatia Kuroda, 1965 accepted as Cancellaria (Habesolatia) Kuroda, 1965
- Genus Hertleinia J. G. Marks, 1949 (2)
- Genus Inglisella H. J. Finlay, 1924 (19)
- Subgenus Inglisella (Anapepta) H. J. Finlay, 1930 accepted as Brocchinia Jousseaume, 1887
- Species Inglisella allophyla P. A. Maxwell, 1988 †
- Species Inglisella ampla Laws, 1935 †
- Species Inglisella awakinoensis Laws, 1935 †
- Species Inglisella caperata (Tate, 1889) †
- Species Inglisella capillata (Tate, 1889) †
- Species Inglisella cincta (F. W. Hutton, 1885) †
- Species Inglisella culminata Beu, 1970 † accepted as Brocchinia culminata (Beu, 1970) †
- Species Inglisella delli (Beu, 1970) †
- Species Inglisella disticha Marwick, 1965 †
- Species Inglisella etheridgei (R. M. Johnston, 1880)
- Species Inglisella hirta Laws, 1936 †
- Species Inglisella jocosa P. A. Maxwell, 1988 †
- Species Inglisella laterinensis P. A. Maxwell, 1988 †
- Species Inglisella marshalli (Vignal, 1921) †
- Species Inglisella marwicki (Dell, 1956)
- Species Inglisella nympha Garrard, 1975 accepted as Brocchinia exigua (E. A. Smith, 1891)
- Species Inglisella parva Laws, 1935 †
- Species Inglisella pukeuriensis (Suter, 1917) †
- Species Inglisella septentrionalis H. J. Finlay, 1930 accepted as Brocchinia septentrionalis (H. J. Finlay, 1930)
- Species Inglisella staffordensis P. A. Maxwell, 1992 †
- Species Inglisella turriculata (Tate, 1889) †
- Species Inglisella ventricosa P. A. Maxwell, 1992 †
- Genus Iphinoella Habe, 1958 accepted as Iphinopsis Dall, 1924
- Genus Iphinopsis Dall, 1924 (11)
- Genus Maorivetia Finlay, 1924 † (1)
- Genus Massyla H. Adams & A. Adams, 1854 (11)
- Genus Mericella Thiele, 1929 (6)
- Genus Microsveltia Iredale, 1925 (20)
- Genus Mirandaphera Bouchet & Petit, 2002 (4)
- Genus Momoebora Kuroda & Habe, 1971 accepted as Merica H. Adams & A. Adams, 1854
- Genus Narona H. Adams & A. Adams, 1854 (4)
- Genus Nevia Jousseaume, 1887 (1)
- Genus Nipponaphera Habe, 1961 (16)
- Genus Oamaruia H. J. Finlay, 1924 (6)
- Genus Olssonella Petit, 1970 accepted as Axelella Petit, 1988
- Genus Ovilia Jousseaume, 1887 † (10)
- Genus Palaeadmete Cossmann, 1920 accepted as Paladmete J. A. Gardner, 1916 †
- Genus Palaeocancellaria Kollmann, 1976 † (1)
- Genus Pallidonia Laseron, 1955 accepted as Pepta Iredale, 1925
- Genus Panarona Petit, 1975 accepted as Narona H. Adams & A. Adams, 1854
- Genus Pepta Iredale, 1925 (3)
- Genus Perplicaria Dall, 1890 (5)
- Genus Petitina Harzhauser & Landau, 2012 † (2)
- Genus Pezantia Cossmann, 1896 † (2)
- Genus Plesiocerithium Cossmann, 1889 † (2)
- Genus Pristimerica H. J. Finlay & Marwick, 1937 † (2)
- Genus Progabbia Dall, 1918 accepted as Cancellaria Lamarck, 1799
- Genus Pyruclia Olsson, 1932 (11)
- Genus Rhomboidestoma K. Martin, 1931 (1)
- Genus Scalptia Jousseaume, 1887 (57)
- Genus Solatia Jousseaume, 1887 (5)
- Genus Solutosveltia Habe, 1961 accepted as Brocchinia Jousseaume, 1887
- Genus Steiningeriella Harzhauser & Landau, 2012 † (1)
- Genus Sydaphera Iredale, 1929 (15)
- Genus Tatara C. A. Fleming, 1950 † (5)
- Genus Trigona G. Perry, 1811 accepted as Trigonostoma Blainville, 1827
- Genus Trigonaphera Iredale, 1936 (7)
- Genus Trigonophera [Habe & Okutani, 1985] accepted as Trigonaphera Iredale, 1936
- Genus Uxia Jousseaume, 1887 † accepted as Unitas K. van W. Palmer, 1947 †
- Genus Ventrilia Jousseaume, 1887 (19)
- Genus Vercomaris Garrard, 1975 accepted as Zeadmete H. J. Finlay, 1926
- Genus Waipaoa Marwick, 1931 † (3)
- Family Cystiscidae W. Stimpson, 1865 (552)
- Family Granulinidae G. A. Coovert & H. K. Coovert, 1995 (152)
- Family Marginellidae J. Fleming, 1828 (1 444)
- Family Marginellonidae Coan, 1965 (4)
- Family Paladmetidae Stephenson, 1941 † accepted as Admetinae Troschel, 1865
- Family Plesiocystiscidae G. A. Coovert & H. K. Coovert, 1995 accepted as Plesiocystiscinae G. A. Coovert & H. K. Coovert, 1995
- Family Volutidae Rafinesque, 1815 (866)
- 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