Phylum Mollusca Linnaeus, 1758 - molluscs
   Class Gastropoda Cuvier, 1795 - snails and slugs
     Subclass Opisthobranchia Milne-Edwards, 1848 - opisthobranchs see Order Opisthobranchia Milne-Edwards, 1848
       Order Cephalaspidea Fischer, 1883
         Superfamily Acteonoidea d'Orbigny, 1843
           Family Aglajidae Pilsbry, 1895 (1847)
             Genus Aglaja Renier, 1807
               Subgenus Navanax Pilsbry, 1895 see Genus Navanax Pilsbry, 1895