Phylum [Mollusca] Linnaeus, 1758 - molluscs
   Class Gastropoda Cuvier, 1795 - snails and slugs
     Subclass Prosobranchia Milne-Edwards, 1848 - prosobranchs see Class Gastropoda Cuvier, 1795
       Order Mesogastropoda Thiele, 1925 - mesogastropods see [unranked] mesogastropods
         Suborder Taenioglossa see Order Mesogastropoda Thiele, 1925
           Superfamily Littorinacea Gray, 1840 see Superfamily Littorinoidea Children, 1834
             Family Littorinidae Children, 1834 - periwinkles
               1 Subfamily Echinininae Rosewater, 1972 see Subfamily Littorininae Children, 1834
               2 Subfamily Littorininae Children, 1834
               3 Subfamily Tectariinae Rosewater, 1972 see Subfamily Littorininae Children, 1834