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 Rachiglossa (Gray, 1853) see Superfamily Muricacea de Costa, 1776
           Superfamily Muricacea de Costa, 1776 see Superfamily Muricoidea Rafinesque, 1815
             Family Muricidae Rafinesque, 1815 - drills
               Subfamily Thaidinae Jousseaume, 1888 see Subfamily Rapaninae Gray, 1853
                 01 Genus Cronia Adams & Adams, 1853
                 02 Genus Drupa Röding, 1798
                 03 Genus Drupella Thiele, 1925
                 04 Genus Maculotriton Dall, 1904
                 05 Genus Morula Schumacher, 1817
                 06 Genus Nassa Röding, 1798
                 07 Genus Pinaxia Adams & Adams, 1853
                 08 Genus Spinidrupa Habe & Kosuge, 1966 see Subgenus Spinidrupa Habe & Kosuge, 1966
                 09 Genus Thais Röding, 1798
                 10 Genus Vexilla Swainson, 1840
                 11 Genus Vitularia W.A. Swainson, 1840