Bilateria Hatschek, 1888 - bilaterians see Subkingdom Bilateria Hatschek, 1888
   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]
     1 Introverta Nielsen, 1995
     2.1.1 Phylum Onychophora Grube, 1853 - velvet worms
     2.1.2 Phylum Tardigrada Doyère, 1840 - tardigrades
     2.2 Phylum Arthropoda Siebold, 1848 - arthropods