Mollusca Linnaeus, 1758 - molluscs see Phylum Mollusca Linnaeus, 1758
   Gastropoda Cuvier, 1795 see Class Gastropoda Cuvier, 1795
     Clade Vetigastropoda Salvini-Plawen, 1980 see Order Vetigastropoda Salvini-Plawen, 1980
       Superfamily Fissurelloidea Fleming, 1822
         Family Fissurellidae Fleming, 1822 - keyhole limpets
           1 Subfamily Fissurellinae Fleming, 1822
           2 Subfamily Emarginulinae Children, 1834