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)
- Superfamily Fissurelloidea J. Fleming, 1822 (716)
- Family Clypidinidae A. N. Golikov & Starobogatov, 1989 accepted as Emarginulinae Children, 1834
- Family Emarginulidae Children, 1834 accepted as Emarginulinae Children, 1834
- Family Fissurellidae J. Fleming, 1822 (716)
- Subfamily Diodorinae Odhner, 1932 accepted as Fissurellideinae Pilsbry, 1890
- Subfamily Emarginulinae Children, 1834 (272)
- Genus Agariste Monterosato, 1892 (3)
- Genus Altrix K. van W. Palmer, 1942 (4)
- Genus Arginula K. van W. Palmer, 1937
- Genus Aviscutum Iredale, 1940 accepted as Scutus Montfort, 1810
- Genus Buchanania R. P. Lesson, 1831 (1)
- Species Buchanania onchidioides R. P. Lesson, 1831
- Genus Clathrosepta J. H. McLean & D. L. Geiger, 1998 (4)
- Genus Clypidella Swainson, 1840
- Genus Clypidina Gray, 1847 (2)
- Genus Emarginella Pilsbry, 1891 (12)
- Genus Emarginula Lamarck, 1801 (158)
- Genus Emarginulus Montfort, 1810 accepted as Emarginula Lamarck, 1801
- Genus Entomella Cotton, 1945 accepted as Emarginula Lamarck, 1801
- Genus Entomella Cossmann, 1888 † (4)
- Genus Fissurisepta G. Seguenza, 1863 (6)
- Genus Laeviemarginula Habe, 1953 (1)
- Genus Laevinesta Pilsbry & T. L. McGinty, 1952 (1)
- Genus Loxotoma P. Fischer, 1885 † accepted as Palaeoloxotoma Hansen, 2019 †
- Genus Manganesepta J. H. McLean & D. L. Geiger, 1998 (2)
- Genus Montfortula Iredale, 1915 (17)
- Genus Nannoscutum Iredale, 1937 accepted as Scutus Montfort, 1810
- Genus Notomella Cotton, 1957 accepted as Emarginula Lamarck, 1801
- Genus Palaeoloxotoma Hansen, 2019 † (2)
- Genus Parmaphorella Strebel, 1907 (3)
- Genus Parmophora Dubois, 1825 accepted as Scutus Montfort, 1810
- Genus Parmophoridea Wenz, 1938 accepted as Parmaphorella Strebel, 1907
- Genus Parmophorus Blainville, 1817 accepted as Scutus Montfort, 1810
- Genus Plagiorhytis P. Fischer, 1885 accepted as Montfortula Iredale, 1915
- Genus Pupillaea Gray, 1835 (2)
- Genus Rimulanax Iredale, 1924 accepted as Puncturella (Cranopsis) A. Adams, 1860
- Genus Rimularia Bronn, 1838 accepted as Rimula Defrance, 1827
- Genus Rixa Iredale, 1924 (1)
- Genus Scelidotoma J. H. McLean, 1966 (2)
- Genus Scutum P. Fischer, 1885 accepted as Scutus Montfort, 1810
- Genus Scutus Montfort, 1810 (15)
- Genus Semperia Crosse, 1867 accepted as Emarginula Lamarck, 1801
- Genus Stromboli S. S. Berry, 1954 (1)
- Genus Subzeidora Iredale, 1924 accepted as Emarginula (Subzeidora) Iredale, 1924
- Genus Tugali J. E. Gray, 1843 (22)
- Genus Tugalia [sic] accepted as Tugali J. E. Gray, 1843 (2)
- Genus Tugalina Habe, 1953 (4)
- Genus Vacerra Iredale, 1924 accepted as Vacerrena Iredale, 1958
- Genus Vacerrena Iredale, 1958 (3)
- Genus Variegemarginula J. H. McLean, 2011 accepted as Montfortula Iredale, 1915
- Subfamily Fissurellidae incertae sedis (5)
- Subfamily Fissurellideinae Pilsbry, 1890 (149)
- Subfamily Fissurellinae J. Fleming, 1822 (110)
- Subfamily Hemitominae Kuroda & Habe, 1971 accepted as Zeidorinae Naef, 1913
- Subfamily Rimulinae Anton, 1838 (20)
- Subfamily Zeidorinae Naef, 1913 (160)
- Family Rimulidae Anton, 1838 accepted as Rimulinae Anton, 1838
- Family Zeidoridae Naef, 1913 accepted as Zeidorinae Naef, 1913
- Superfamily Haliotoidea Rafinesque, 1815 (94)
- Superfamily Lepetelloidea Dall, 1882 (104)
- Superfamily Lepetodriloidea J. H. McLean, 1988 (34)
- Superfamily Scissurelloidea J. E. Gray, 1847 (257)
- Order Neomphalida (63)
- Order Pleurotomariida (695)
- Order Seguenziida (923)
- Order Trochida (3 799)
- 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