Between brackets is the number of accepted species

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- Mollusca (132 851)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (25 013)
- Class Caudofoveata (143)
- Class Cephalopoda (1 834)
- Class Conchifera accepted as Bivalvia
- Class Cricoconarida † (1)
- Class Gastropoda (102 753)
- Subclass Amphigastropoda † (396)
- Subclass Angiogastropoda represented as Gastropoda
- Subclass Apogastropoda
- Subclass Caenogastropoda (53 670)
- Subterclass Sorbeoconcha (147)
- Superorder Hypsogastropoda
- Order Architaenioglossa (4 919)
- Order Caenogastropoda incertae sedis (7 677)
- Order Littorinimorpha (17 189)
- Order Neogastropoda (23 738)
- Superfamily Buccinoidea Rafinesque, 1815 (5 253)
- Superfamily Cancellarioidea Forbes & Hanley, 1851 accepted as Volutoidea Rafinesque, 1815
- Superfamily Conoidea J. Fleming, 1822 (8 694)
- 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 † (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 (3 873)
- Family Cancellariidae Forbes & Hanley, 1851 (855)
- Subfamily Admetinae Troschel, 1865 (129)
- Subfamily Cancellariinae Forbes & Hanley, 1851 (284)
- Genus Agatrix Petit, 1967 (6)
- Genus Aphera H. Adams & A. Adams, 1854 (10)
- Genus Bonellitia Jousseaume, 1887 (17)
- Genus Cancellaria Lamarck, 1799 (84)
- Genus Contortia Sacco, 1894 † (11)
- Genus Coptostoma Cossmann, 1899 † (4)
- Genus Merica H. Adams & A. Adams, 1854 (29)
- Subgenus Merica (Gergovia) Cossmann, 1899 † accepted as Gergovia Cossmann, 1899 †
- Subgenus Merica (Merica) H. Adams & A. Adams, 1854 represented as Merica H. Adams & A. Adams, 1854
- Species Merica (Merica) aqualica (Petit & Harasewych, 1986) represented as Merica aqualica (Petit & Harasewych, 1986)
- Species Merica (Merica) ektyphos Petit & Harasewych, 2000 represented as Merica ektyphos Petit & Harasewych, 2000
- Species Merica (Merica) melanostoma (G. B. Sowerby II, 1849) represented as Merica melanostoma (G. B. Sowerby II, 1849)
- Species Merica (Merica) purpuriformis (Kiener, 1841) represented as Merica purpuriformis (Kiener, 1841)
- Subgenus Merica (Sydaphera) Iredale, 1929 represented as Sydaphera Iredale, 1929
- Species Merica admirabilis Lozouet, 2019 †
- Species Merica aqualica (Petit & Harasewych, 1986)
- Species Merica asperella (Lamarck, 1822)
- Species Merica asprella [sic] accepted as Merica asperella (Lamarck, 1822)
- Species Merica boucheti (Petit & Harasewych, 1986)
- Species Merica canaliculata (A. W. Janssen, 1972) †
- Species Merica crenata (M. Hörnes, 1856) †
- Species Merica deynzeri Petit & Harasewych, 2000
- Species Merica ektyphos Petit & Harasewych, 2000
- Species Merica elegans (G. B. Sowerby I, 1822)
- Species Merica estotiensis Lozouet, 2019 †
- Species Merica fenestrata (Eichwald, 1830) † accepted as Contortia fenestrata (Eichwald, 1830) †
- Species Merica gerthi K. Martin, 1931 †
- Species Merica gigantea (Y.-C. Lee & T. C. Lan, 2002)
- Species Merica haweraensis Laws, 1940 † accepted as Scalptia haweraensis (Laws, 1940) †
- Species Merica kaiparaensis Laws, 1939 † accepted as Scalptia kaiparaensis (Laws, 1939) †
- Species Merica kobayashii (Yokoyama, 1927) †
- Species Merica krocki Z. Kovács & Vicián, 2016 †
- Species Merica laticosta (Löbbecke, 1881)
- Species Merica lussii Petit & Harasewych, 2000
- Species Merica macrospira (A. Adams & Reeve, 1850) accepted as Fusiaphera macrospira (A. Adams & Reeve, 1850)
- Species Merica marisca Bouchet & Petit, 2002
- Species Merica melanostoma (G. B. Sowerby II, 1849)
- Species Merica mioquadrata Sacco, 1894 † accepted as Perplicaria mioquadrata (Sacco, 1894) †
- Species Merica mutabilis Lozouet, 2019 †
- Species Merica oblonga (G. B. Sowerby I, 1825)
- Species Merica obsoleta (M. Hörnes, 1856) †
- Species Merica petiti (Ladd, 1982) †
- Species Merica pilasensis Verhecken, 2018
- Species Merica pukeuriensis Finlay, 1930 † accepted as Scalptia pukeuriensis (Finlay, 1930) †
- Species Merica purpuriformis (Kiener, 1841)
- Species Merica semperiana (Crosse, 1863)
- Species Merica sinensis (Reeve, 1856)
- Species Merica stuardoi (J. H. McLean & H. Andrade, 1982)
- Species Merica succineiformis (O. Boettger, 1906) †
- Species Merica undulata (G. B. Sowerby II, 1849) accepted as Sydaphera undulata (G. B. Sowerby II, 1849)
- Species Merica verbeeki (K. Martin, 1895) †
- Species Merica westralis (Garrard, 1975)
- Genus Rotatrigonostoma Landau, Breitenberger & Harzhauser, 2020 † (2)
- Genus Semitriton Cossmann, 1903 † (3)
- Genus Sveltia Jousseaume, 1887 (24)
- Genus Tribia Jousseaume, 1887 (12)
- Genus Trigonostoma Blainville, 1827 (42)
- Genus Unitas K. van W. Palmer, 1947 † (40)
- 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)
- 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 (39 172)
- 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