Phylum Mollusca Linnaeus, 1758 - molluscs
Class Gastropoda Cuvier, 1795 - snails and slugs
Subclass Prosobranchia Milne-Edwards, 1848 - prosobranchs
see Class Gastropoda Cuvier, 1795
Superorder Archaeogastropoda Thiele, 1925
Order Vetigastropoda Salvini-Plawen, 1980 - archaeogastropods s.l.
Superfamily Fissurelloidea Fleming, 1822 [monotypic]
Family Fissurellidae Fleming, 1822 - keyhole limpets
1 Subfamily Emarginulinae Children, 1834
2 Subfamily Diodorinae Odhner, 1932
see Tribe Diodorini Odhner, 1932
3 Subfamily Fissurellinae Fleming, 1822
4 Subfamily Fissurellidinae Pilsbry, 1890, orth. inval.
see Subfamily Fissurellideinae Pilsbry, 1890