[Bilateria] Hatschek, 1888 - bilaterians see Subkingdom Bilateria Hatschek, 1888
   ecdysozoans see Clade Ecdysozoa Aguinaldo, Turbeville, Linford, Rivera, Garey, Raff & Lake 1997, nom. cl. inval.
     1.1 ?Rotifera Cuvier, 1798 - rotifers see Phylum Syndermata Ahlrichs, 1995
     1.2 Cycloneuralia Nielsen, 1995 see [unranked] Introverta Nielsen, 1995
     2.1 Class †Dinocaridida Collins, 1996
     2.2 †xenusians see Class Xenusia Dzik & Krumbiegel, 1989
     2.3 Onychophora Grube, 1853 - velvet worms
     2.4.1 Tardigrada Doyère, 1840 - tardigrades
     2.4.2 Arthropoda Siebold, 1848 - arthropods