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)
- 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)
- 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)
- Subfamily Fissurellidae incertae sedis (5)
- Subfamily Fissurellideinae Pilsbry, 1890 (149)
- Subfamily Fissurellinae J. Fleming, 1822 (110)
- Genus Amblychilepas Pilsbry, 1890 (8)
- Genus Atractotrema Cossmann, 1888 † (2)
- Genus Balboaina Pérez Farfante, 1943 accepted as Fissurella Bruguière, 1789
- Genus Dendrofissurella J. H. McLean & Kilburn, 1986 (1)
- Genus Dolichoschisma Iredale, 1940 accepted as Macroschisma Gray, 1835
- Genus Fissurella Bruguière, 1789 (62)
- Genus Fissurellus Montfort, 1810 accepted as Fissurella Bruguière, 1789
- Genus Forolepas Iredale, 1940 accepted as Macroschisma Gray, 1835
- Genus Leurolepas J. H. McLean, 1970 (1)
- Genus Lucapinella Pilsbry, 1890 (14)
- Species Lucapinella aequalis (G. B. Sowerby I, 1835)
- Species Lucapinella callomarginata (Dall, 1871)
- Species Lucapinella canalifera (G. Nevill & H. Nevill, 1869)
- Species Lucapinella clypeata (Grateloup, 1828) †
- Species Lucapinella crenifera (G. B. Sowerby I, 1835)
- Species Lucapinella delicata Nowell-Usticke, 1969
- Species Lucapinella elenorae J. H. McLean, 1967
- Species Lucapinella gaylodrae [sic] accepted as Lucapinella gaylordae Preston, 1908
- Species Lucapinella gaylordae Preston, 1908
- Species Lucapinella gigas Nowell-Usticke, 1959
- Subspecies Lucapinella gigas oblonga Nowell-Usticke, 1959
- Variety Lucapinella gigas var. oblonga Nowell-Usticke, 1959 accepted as Lucapinella gigas oblonga Nowell-Usticke, 1959
- Species Lucapinella henkdekkeri Poppe & Tagaro, 2020
- Species Lucapinella henseli (E. von Martens, 1900)
- Species Lucapinella limatula (Reeve, 1850)
- Species Lucapinella milleri S. S. Berry, 1959
- Species Lucapinella pritchardi Hedley, 1895 accepted as Amblychilepas oblonga (Menke, 1843)
- Species Lucapinella versluysi Dautzenberg, 1900
- Genus Machrochisma accepted as Macroschisma Gray, 1835
- Genus Macrochisma Gray, 1835 accepted as Macroschisma Gray, 1835
- Genus Macroschisma Gray, 1835 (18)
- Genus Medusafissurella J. H. McLean & Kilburn, 1986 (4)
- Genus Sophismalepas Iredale, 1924 accepted as Amblychilepas Pilsbry, 1890
- 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