Phylum Arthropoda Siebold, 1848 - arthropods
   Subphylum Crustacea Brünnich, 1772 - crustaceans see Superclass Crustacea Pennant, 1777
     Class Maxillopoda Dahl, 1956 see Subphylum Pancrustacea Zrzavý et al., 1997
       Subclass Thecostraca Gruvel, 1905 - barnacles
         Infraclass Cirripedia Burmeister, 1834 - barnacles
           Superorder Thoracica Darwin, 1854
             Order Pedunculata Lamarck, 1818
               Suborder Scalpellomorpha Newman, 1987
                 1 Family Calanticidae Zevina, 1978
                 2 Family Lithotryidae Gruvel, 1905
                 3 Family Pollicipedidae Leach, 1817
                 4 Family Scalpellidae Pilsbry, 1907