Kingdom Animalia Linnaeus, 1758 - animals
   Phylum Mollusca Linnaeus, 1758 - molluscs
     Subphylum Cyrtosoma Runnegar & Pojeta Jr., 1974 see Phylum Mollusca Linnaeus, 1758
       Class Gastropoda Cuvier, 1795 - snails and slugs
         Subclass Prosobranchia Milne-Edwards, 1848 - prosobranchs see Class Gastropoda Cuvier, 1795
           Order Archaeogastropoda Thiele, 1925 see Order Vetigastropoda Salvini-Plawen, 1980
             Suborder Pleurotomariina (Cox & Knight, 1960) see Superfamily Pleurotomarioidea Swainson, 1840
               Genus Diodora Gray, 1821
               Genus Emarginula Lamarck, 1801
               Genus Haliotis Linnaeus, 1758
               Genus Mikadotrochus Lindholm, 1927