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 Sessilia Lamarck, 1818
               Suborder Balanomorpha Pilsbry, 1916
                 Superfamily Pachylasmatoidea Utinomi, 1968
                   1 Family Pachylasmatidae Utinomi, 1968