Metazoa Haeckel 1874 - multicellular animals see Kingdom Animalia Linnaeus, 1758
   Planulozoa Wallberg, Thollesson, Farris & Jondelius 2004
     Bilateria Hatschek, 1888 - bilaterians see Subkingdom Bilateria Hatschek, 1888
       Xenacoelomorpha Philippe, Brinkmann, Copley, Moroz, Nakano, Poustka, Wallberg, Peterson & Telford 2011 see Phylum Xenacoelomorpha Philippe, Brinkmann, Copley, Moroz, Nakano, Poustka, Wallberg, Peterson & Telford, 2011
         [Phylum] Acoelomorpha Ehlers, 1985 - acoelomorphs see Subphylum Acoelomorpha Ehlers, 1985