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)
- Superfamily Eoacmaeoidea T. Nakano & Ozawa, 2007 accepted as Lottioidea Gray, 1840
- Superfamily Lottioidea Gray, 1840 (334)
- Superfamily Nacelloidea Thiele, 1891 accepted as Patelloidea Rafinesque, 1815
- Superfamily Neolepetopsoidea J. H. McLean, 1990 accepted as Lottioidea Gray, 1840
- Superfamily Patelloidea Rafinesque, 1815 (177)
- Family Nacellidae Thiele, 1891 (79)
- Family Patellidae Rafinesque, 1815 (98)
- Subfamily Haliotinae Rafinesque, 1815 accepted as Haliotidae Rafinesque, 1815
- Genus Ancistromesus Dall, 1871 accepted as Scutellastra H. Adams & A. Adams, 1854
- Genus Ansates G. B. Sowerby II, 1839 accepted as Patella Linnaeus, 1758
- Genus Berlieria de Loriol, 1903 † (2)
- Genus Costatopatella Pallary, 1912 accepted as Patella Linnaeus, 1758
- Genus Cymbula H. Adams & A. Adams, 1854 (11)
- Genus Helcion Montfort, 1810 (4)
- Subgenus Helcion (Ansates) G. B. Sowerby II, 1839 accepted as Patella Linnaeus, 1758
- Species Helcion (Ansates) pellucidus (Linnaeus, 1758) accepted as Patella pellucida Linnaeus, 1758
- Subgenus Helcion (Helcioniscus) Dall, 1871 accepted as Helcioniscus Dall, 1871
- Species Helcion angulata A. d'Orbigny, 1845 †
- Species Helcion boutillieri Cossmann, 1888 † accepted as Lepeta boutillieri (Cossmann, 1888) †
- Species Helcion carbonarius Gabb, 1877 †
- Species Helcion concolor (Krauss, 1848)
- Species Helcion dunkeri (Krauss, 1848)
- Species Helcion dunkeri A. d'Orbigny, 1850 † accepted as Dietrichiella subquadrata (Dunker, 1844) †
- Species Helcion gracile Locard, 1891 accepted as Ansates pellucida (Linnaeus, 1758)
- Species Helcion hebertiana A. d'Orbigny, 1850 † accepted as Patella hebertiana (A. d'Orbigny, 1850) †
- Species Helcion leanus Gabb, 1860 †
- Species Helcion normaniana A. d'Orbigny, 1850 †
- Species Helcion pectunculus (Gmelin, 1791)
- Species Helcion pellucidum (Linnaeus, 1758) accepted as Patella pellucida Linnaeus, 1758
- Species Helcion problematicus Nagao & Otatume, 1938 † accepted as Gigantocapulus problematicus (Nagao & Otatume, 1938) †
- Species Helcion pruinosus (Krauss, 1848)
- Species Helcion semirugosum Laube, 1866 † accepted as Hennocquia semirugosa (Laube, 1866) †
- Species Helcion subcostaria A. d'Orbigny, 1852 † accepted as Siphonaria bisiphites Michelin, 1831 †
- Species Helcion subrugosus A. d'Orbigny, 1850 † accepted as Helcionella subrugosa (A. d'Orbigny, 1850)
- Species Helcion thurmanni de Loriol, 1890 † accepted as Symmetrocapulus thurmanni (de Loriol, 1890) †
- Genus Helcium Meek & Hayden, 1850 † accepted as Helcion Montfort, 1810
- Genus Laevipatella Pallary, 1920 accepted as Cymbula H. Adams & A. Adams, 1854
- Genus Patella Linnaeus, 1758 (40)
- Genus Patellanax Iredale, 1924 accepted as Scutellastra H. Adams & A. Adams, 1854
- Genus Patellastra Monterosato, 1884 accepted as Patella Linnaeus, 1758
- Genus Patellidea Thiele, 1891 accepted as Scutellastra H. Adams & A. Adams, 1854
- Genus Patellona Thiele, 1891 accepted as Cymbula H. Adams & A. Adams, 1854
- Genus Patellopsis Thiele, 1931
- Genus Patellus Montfort, 1810 accepted as Patella Linnaeus, 1758
- Genus Patina Leach, 1847 accepted as Patella Linnaeus, 1758
- Genus Patinastra Thiele, 1891 accepted as Helcion Montfort, 1810
- Genus Penepatella Iredale, 1929 accepted as Scutellastra H. Adams & A. Adams, 1854
- Genus Proscutum P. Fischer, 1885 † (17)
- Genus Scutellastra H. Adams & A. Adams, 1854 (24)
- 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