[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]
       Nematoida Rudolphi, 1808
         1 Nematomorpha - hairworms see Phylum Nematomorpha Vejdovsky, 1886
         2 Nematoda Gegenbaur, 1859 - roundworms see Phylum Nematoda Gegenbaur, 1859