[Bilateria] Hatschek, 1888 - bilaterians see Subkingdom Bilateria Hatschek, 1888
   ecdysozoans see Clade Ecdysozoa Aguinaldo, Turbeville, Linford, Rivera, Garey, Raff & Lake 1997, nom. cl. inval.
     Cycloneuralia Nielsen, 1995 see [unranked] Introverta Nielsen, 1995
       1 Gastrotricha Metschnikoff, 1864 - gastrotrichs
       2.1.1 Nematomorpha Vejdovsky, 1886 - horsehair worms
       2.1.2 Nematoda Gegenbaur, 1859 - round worms
       2.2.1 Priapulida Delage & Hérouard, 1897 - priapulids
       2.2.2 Kinorhyncha Reinhard, 1887 - kinorhynchs