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 Fasciolariidae Gray, 1853 - tulip snails
               Subfamily Colubrariinae Dall, 1904 see Family Colubrariidae Dall, 1904
                 Genus Metula Adams & Adams, 1853
                   1 Subgenus Daphnobela Cossmann, 1896
                   2 Subgenus Celatoconus Conrad, 1863