Phylum Mollusca Linnaeus, 1758 - molluscs
   Class Gastropoda Cuvier, 1795 - snails and slugs
     Subclass Prosobranchia Milne-Edwards, 1848 - prosobranchs see Class Gastropoda Cuvier, 1795
       Order Neogastropoda Wenz, 1938 see Suborder Neogastropoda Wenz, 1938
         Suborder Stenoglossa Bouvier, 1887
           Superfamily Muricoidea Rafinesque, 1815
             Family Muricidae Rafinesque, 1815 - drills
               Subfamily Rapaninae Gray, 1853
                 Genus Drupa Röding, 1798
                   1 Subgenus Drupa Röding, 1798
                   2 Subgenus Ricinella Schumacher, 1817
                   3 Subgenus Drupina Dall, 1923