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 Rhizocephala Müller, 1862
             Order Akentrogonida Häfele, 1911
               1 Family Chthamalophilidae J. Bocquet-Védrine, 1961
               2 Family Clistosaccidae Boschma, 1928
               3 Family Duplorbidae J.T. Høeg & A.V. Rybakov, 1992
               4 Family Mycetomorphidae J.T. Høeg & A.V. Rybakov, 1992
               5 Family Polysaccidae Lützen & Takahashi, 1996
               6 Family Thompsoniidae J.T. Høeg & A.V. Rybakov, 1992