Phylum Mollusca Linnaeus, 1758 - molluscs
   Class Gastropoda Cuvier, 1795 - snails and slugs
     Subclass Prosobranchia Milne-Edwards, 1848 - prosobranchs see Class Gastropoda Cuvier, 1795
       Order Caenogastropoda Cox, 1960 see Superorder Caenogastropoda Cox, 1960
         Suborder Neotaenioglossa Haller, 1882 see Order Sorbeoconcha Ponder & Lindberg, 1997
           Superfamily Naticoidea Guilding, 1834
             Family Naticidae Guilding, 1834 - moon snails
               Subfamily Polinicinae Gray, 1847 see Subfamily Naticinae Guilding, 1834
                 Genus Euspira Agassiz, 1838