Metazoa Haeckel 1874 - multicellular animals see Kingdom Animalia Linnaeus, 1758
   Bilateria Hatschek, 1888 - bilaterians see Subkingdom Bilateria Hatschek, 1888
     1 Phylum Acoelomorpha Ehlers, 1985 - acoelomorphs see Subphylum Acoelomorpha Ehlers, 1985
     2 Eubilateria Ax, 1987 see Clade Nephrozoa Jondelius, Ruiz-Trillo, Baguñà & Riutort 2002