Metazoa see Kingdom Animalia Linnaeus, 1758
   Gastraeozoa
     Trochaeozoa see [unranked] Bilateria Hatschek, 1888
       Protornaeozoa
         Notoneuralia Ulrich, 1951
           Cyrtotreta
             Phylum Enteropneusta Gegenbaur, 1870 see Class Enteropneusta Gegenbaur, 1870