Eukaryota Chatton, 1925 - eukaryotes see Domain Eukaryota Chatton, 1925
   Opisthokonta Cavalier-Smith, 1987 - opisthokonts see Clade Opisthokonta Cavalier-Smith 1987, nom. cl. inval.
     Metazoa Haeckel 1874 - multicellular animals see Kingdom Animalia Linnaeus, 1758
       Eumetazoa Bütschli, 1910 - eumetazoans
         Triploblastica see [unranked] Bilateria Hatschek, 1888
           Bilateria Hatschek, 1888 - bilaterians see Subkingdom Bilateria Hatschek, 1888
             Protostomia Grobben, 1908 see Infrakingdom Protostomia Grobben, 1908
               Ecdysozoa Aguinaldo, Turbeville, Linford, Rivera, Garey, Raff & Lake 1997, nom. cl. inval. - ecdysozoans see Clade Ecdysozoa Aguinaldo, Turbeville, Linford, Rivera, Garey, Raff & Lake 1997 [Lake, Halanych, Servin & Garey 2020]
                 Hemocoelia
                   Superphylum Panarthropoda Nielsen, 1995 see [unranked] Panarthropoda Nielsen, 1995
                     Phylum Arthropoda Siebold, 1848 - arthropods
                       Mandibulata see Subphylum Mandibulata Snodgrass, 1938
                         Subphylum Crustacea Brünnich, 1772 - crustaceans see Superclass Crustacea Pennant, 1777
                           Eucrustacea Kingsley, 1894
                             Superclass Maxillopoda Dahl, 1956
                               Progonomorpha
                                 Thecostracomorpha
                                   Thecostraca see Subclass Thecostraca Gruvel, 1905
                                     Class Cirripedia (Rafinesque, 1816) see Infraclass Cirripedia Burmeister, 1834
                                       Class Rhizocephala Müller, 1862