Between brackets is the number of accepted species

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- Mollusca (132 754)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (24 992)
- Class Caudofoveata (143)
- Class Cephalopoda (1 832)
- Class Conchifera accepted as Bivalvia
- Class Cricoconarida † (1)
- Class Gastropoda (102 679)
- Subclass Amphigastropoda † (387)
- Subclass Angiogastropoda represented as Gastropoda
- Subclass Apogastropoda
- Subclass Caenogastropoda (53 623)
- 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)
- Order Anisobranchia accepted as Trochidae Rafinesque, 1815
- Order Cocculinida (69)
- Order Lepetellida (1 205)
- Order Neomphalida (63)
- Order Pleurotomariida (695)
- Order Seguenziida (923)
- Order Trochida (3 799)
- Superfamily Angarioidea Gray, 1857 accepted as Trochoidea Rafinesque, 1815
- Superfamily Phasianelloidea Swainson, 1840 accepted as Trochoidea Rafinesque, 1815
- Superfamily Trochoidea Rafinesque, 1815 (3 799)
- Family Angariidae J. E. Gray, 1857 (59)
- Family Anomphalidae Wenz, 1938 † (16)
- Family Araeonematidae Nützel, 2012 † (10)
- Family Areneidae J. H. McLean, 2012 (56)
- Genus Arene H. Adams & A. Adams, 1854 (38)
- Subgenus Arene (Marevalvata) Olsson & Harbison, 1953 accepted as Arene H. Adams & A. Adams, 1854
- Species Arene (Marevalvata) bitleri Olsson & McGinty, 1958 represented as Arene bitleri Olsson & McGinty, 1958
- Species Arene (Marevalvata) laguairana Weisbord, 1962 represented as Arene laguairana Weisbord, 1962
- Species Arene adusta J. H. McLean, 1970
- Species Arene alta Rubio & Rolán, 2018
- Species Arene bairdii (Dall, 1889)
- Species Arene balboai (A. M. Strong & Hertlein, 1939)
- Species Arene bitleri Olsson & McGinty, 1958
- Species Arene boucheti Leal, 1991
- Species Arene brasiliana (Dall, 1927)
- Species Arene briarea (Dall, 1881)
- Species Arene carinata (P. P. Carpenter, 1857)
- Species Arene centrifuga (Dall, 1896)
- Species Arene cruentata (Megerle von Mühlfeld, 1824)
- Species Arene curacoana Pilsbry, 1934
- Species Arene descensa Rubio & Rolán, 2018
- Species Arene echinacantha (Melvill & Standen, 1903)
- Species Arene echinata J. H. McLean, 1970
- Species Arene ferruginosa J. H. McLean, 1970
- Species Arene flexispina Leal & Coelho, 1985
- Species Arene fricki (Crosse, 1865)
- Species Arene guttata J. H. McLean, 1970
- Species Arene guyanensis Rubio & Rolán, 2018
- Species Arene hindsiana Pilsbry & H. N. Lowe, 1932
- Species Arene laguairana Weisbord, 1962
- Species Arene lucasensis (A. M. Strong, 1934) accepted as Haplocochlias lucasensis (A. M. Strong, 1934)
- Species Arene lurida (Dall, 1913)
- Species Arene lychee Cavallari & Simone, 2018
- Species Arene mcleani Kiel & Bandel, 2002 † accepted as Mcleanarene taluniya Pacaud, 2023 †
- Species Arene mcleani Squires, 1988 †
- Species Arene metaltilana Ladd, 1966 †
- Species Arene microforis (Dall, 1889)
- Species Arene miniata (Dall, 1889)
- Species Arene notialis Marini, 1975
- Species Arene olivacea (Dall, 1918)
- Species Arene pulex Faber, 2009
- Species Arene riisei Rehder, 1943
- Species Arene socorroensis (A. M. Strong, 1934)
- Species Arene stellata J. H. McLean, 1970
- Species Arene tamsiana [sic] accepted as Arene tamsii (R. A. Philippi, 1852)
- Species Arene tamsii (R. A. Philippi, 1852)
- Species Arene tricarinata (Stearns, 1872)
- Species Arene truncatosphaera Sohl, 1998 † accepted as Xamaycarene truncatosphaera (Sohl, 1998) †
- Species Arene vanhyningi Rehder, 1943 accepted as Arene cruentata (Megerle von Mühlfeld, 1824)
- Species Arene variabilis (Dall, 1889)
- Species Arene venusta (Woodring, 1928)
- Species Arene venustula Aguayo & Rehder, 1936
- Species Arene winslowae Pilsbry & H. N. Lowe, 1932 accepted as Arene olivacea (Dall, 1918)
- Genus Cinysca Kilburn, 1970 (10)
- Genus Cynisca H. Adams & A. Adams, 1854 accepted as Cinysca Kilburn, 1970 (1)
- Genus Marevalvata Olsson & Harbison, 1953 accepted as Arene H. Adams & A. Adams, 1854
- Genus Mcleanarene Pacaud, 2023 † (1)
- Genus Pictarene Pacaud, 2023 † (5)
- Genus Xamaycarene Pacaud, 2023 † (1)
- Family Ataphridae Cossmann, 1915 † (16)
- Family Calliostomatidae Thiele, 1924 (1847) (617)
- Family Colloniidae Cossmann, 1917 (362)
- Family Conradiidae A. N. Golikov & Starobogatov, 1987 (109)
- Family Crosseolidae Hickman, 2013 accepted as Conradiidae A. N. Golikov & Starobogatov, 1987
- Family Cyclostrematidae P. Fischer, 1885 accepted as Liotiidae Gray, 1850
- Family Delphinulidae Stoliczka, 1868 accepted as Angariidae J. E. Gray, 1857
- Family Elasmonematidae Knight, 1956 † (11)
- Family Epulotrochidae Gründel, Keupp & F. Lang, 2017 † (10)
- Family Eucochlidae Bandel, 2002 † (3)
- Family Fossarinidae Bandel, 2009 accepted as Fossarininae Bandel, 2009
- Family Gazidae Hickman & J. H. McLean, 1990 accepted as Margaritidae Thiele, 1924
- Family Liotiidae Gray, 1850 (154)
- Family Liotinidae Nomura, 1932 accepted as Liotiidae Gray, 1850
- Family Margaritidae Thiele, 1924 (76)
- Family Margaritinae Stoliczka, 1868 accepted as Margaritidae Thiele, 1924
- Family Metriomphalidae Gründel, Keupp & F. Lang, 2017 † (8)
- Family Microdomatidae Wenz, 1938 † (12)
- Family Nododelphinulidae L. R. Cox, 1960 † (17)
- Family Paleophasianellidae Chaix & Plicot, 2024 † (2)
- Family Phasianellidae Swainson, 1840 (84)
- Family Proconulidae L. R. Cox, 1960 † (10)
- Family Sclarotrardidae Gründel, Keupp & F. Lang, 2017 † (1)
- Family Skeneidae W. Clark, 1851 (440)
- Family Solariellidae A. W. B. Powell, 1951 (272)
- Family Stomatellidae J. E. Gray, 1840 accepted as Stomatellinae J. E. Gray, 1840
- Family Stomatiidae P. P. Carpenter, 1861 accepted as Stomatellinae J. E. Gray, 1840
- Family Talopiidae Finlay, 1928 accepted as Umboniinae H. Adams & A. Adams, 1854 (1840)
- Family Tegulidae Kuroda, Habe & Oyama, 1971 (120)
- Family Tricoliidae Woodring, 1928 accepted as Tricoliinae Woodring, 1928
- Family Trochidae Rafinesque, 1815 (1 043)
- Family Trochoidea incertae sedis (15)
- Family Turbinidae Rafinesque, 1815 (275)
- Family Tychobraheidae Horný, 1992 † (1)
- Family Velainellidae Vasseur, 1880 †
- Subfamily Minoliinae Kuroda, T. Habe & Oyama, 1971 accepted as Solariellidae A. W. B. Powell, 1951
- Subfamily Parataphrinae Calzada, 1989 † accepted as Proconulidae L. R. Cox, 1960 †
- Superfamily Fissurellacea accepted as Fissurelloidea J. Fleming, 1822
- Superfamily Trochacea accepted as Trochoidea Rafinesque, 1815
- Superfamily Turbinoidea Rafinesque, 1815 accepted as Trochoidea Rafinesque, 1815
- Superfamily Vetigastropoda incertae sedis (28)
- 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