Opisthokonta Cavalier-Smith 1987, nom. cl. inval. see Clade Opisthokonta Cavalier-Smith 1987 [Simpson & Medina 2020]
   Metazoa Haeckel 1874 - multicellular animals see Kingdom Animalia Linnaeus, 1758
     Epitheliozoa Ax, 1996
       Eumetazoa Bütschli, 1910 - eumetazoans
         Acrosomata Ax, 1996 see [unranked] Eumetazoa Bütschli, 1910
           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]
                 Panarthropoda Nielsen, 1995 - panarthropods
                   Arthropoda Siebold, 1848 - arthropods
                     Pancrustacea Zrzavý et al., 1997 see Subphylum Pancrustacea Zrzavý et al., 1997
                       1 Ostracoda Latreille, 1806 see Class Ostracoda Latreille, 1802
                       2 Branchiopoda Latreille, in Cuvier, 1817 see Class Branchiopoda Latreille, 1817
                       3 Ichthyostraca Zrzavý et al., 1997
                       4 Insecta Linnaeus, 1758 - insects see Class Insecta Linnaeus, 1758
                       5 Cirripedia - barnacles see Infraclass Cirripedia Burmeister, 1834
                       6 Malacostraca Latreille 1802 see Class Malacostraca Latreille, 1802
                       7 pentastomids see Subclass Pentastomida Diesing, 1836