Between brackets is the number of accepted species

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- Mollusca (133 377)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (25 099)
- Class Caudofoveata (143)
- Class Cephalopoda (1 933)
- Class Conchifera accepted as Bivalvia
- Class Cricoconarida † (1)
- Class Gastropoda (103 088)
- Subclass Amphigastropoda † (439)
- Subclass Angiogastropoda represented as Gastropoda
- Subclass Apogastropoda
- Subclass Caenogastropoda (53 884)
- Subclass Gastropoda incertae sedis (313)
- Subclass Heterobranchia (39 230)
- Subclass Neomphaliones accepted as Vetigastropoda
- Subclass Neritimorpha (1 916)
- Subclass Orthogastropoda represented as Gastropoda
- Subclass Patellogastropoda (517)
- Superfamily Eoacmaeoidea T. Nakano & Ozawa, 2007 accepted as Lottioidea Gray, 1840
- Superfamily Lottioidea Gray, 1840 (337)
- Family Acmaeidae Forbes, 1850 (25)
- Genus Acmaea Eschscholtz, 1833 (15)
- Genus Acmea [sic] accepted as Acmaea Eschscholtz, 1833
- Genus Deslongchampsia McCoy, 1851 †
- Genus Dietrichiella Dacqué, 1934 † (1)
- Genus Guerangeria Cossmann, 1885 † accepted as Marbodaeia Chelot, 1886 †
- Genus Hennocquia Dacqué, 1934 † (2)
- Genus Marbodaeia Chelot, 1886 † (3)
- Genus Marbodeia [sic] † accepted as Marbodaeia Chelot, 1886 †
- Genus Pseudorhytidopilus L. R. Cox, 1960 † (1)
- Genus Scurriopsis Gemmellaro, 1879 † (3)
- Subgenus Scurriopsis (Dietrichiella) Dacqué, 1934 † accepted as Dietrichiella Dacqué, 1934 †
- Subgenus Scurriopsis (Hennoquia) [sic] † accepted as Hennocquia Dacqué, 1934 †
- Subgenus Scurriopsis (Scurriopsis) Gemmellaro, 1878 † represented as Scurriopsis Gemmellaro, 1879 †
- Species Scurriopsis coromiformis X.-G. Zhu, 1995 †
- Species Scurriopsis neumayri Gemmellaro, 1879 †
- Species Scurriopsis schmidtii (Dunker, 1844) †
- Family Bertiniidae Jousseaume, 1883 accepted as Nacellidae Thiele, 1891
- Family Damilinidae Horný, 1961 † (14)
- Family Eoacmaeidae T. Nakano & Ozawa, 2007 (15)
- Family Erginidae A. V. Chernyshev, 2018 accepted as Rhodopetalidae Lindberg, 1981
- Family Lepetidae J. E. Gray, 1850 (24)
- Family Lepetopsidae J. H. McLean, 1990 † (11)
- Family Lottidae [sic] accepted as Lottiidae Gray, 1840
- Family Lottiidae Gray, 1840 (191)
- Family Neolepetopsidae J. H. McLean, 1990 (18)
- Family Patelloididae Chapman & Gabriel, 1923 accepted as Patelloidini Chapman & Gabriel, 1923
- Family Pectinodontidae Pilsbry, 1891 (32)
- Family Propilidiidae accepted as Lepetidae J. E. Gray, 1850
- Family Rhodopetalidae Lindberg, 1981 (7)
- Family Tecturidae J. E. Gray, 1847 accepted as Tecturinae J. E. Gray, 1847
- Superfamily Nacelloidea Thiele, 1891 accepted as Patelloidea Rafinesque, 1815
- Superfamily Neolepetopsoidea J. H. McLean, 1990 accepted as Lottioidea Gray, 1840
- Superfamily Patelloidea Rafinesque, 1815 (180)
- Subclass Prosobranchia
- Subclass Psilogastropoda represented as Gastropoda
- Subclass Vetigastropoda (6 789)
- 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 (1 381)
- Class Polyplaxiphora accepted as Polyplacophora
- Class Rostroconchia † (64)
- Class Scaphopoda (754)
- Class Solenoconchia accepted as Scaphopoda
- Class Solenogastres (313)
- Subclass Chaetodermomorpha accepted as Caudofoveata