Metazoa Haeckel 1874 - multicellular animals see Kingdom Animalia Linnaeus, 1758
   Phylum Platyhelminthes Gegenbaur, 1859 - flatworms
     1 Class Turbellaria Ehrenberg, 1831 - planarians see Subphylum Turbellaria Ehrenberg, 1831
     2 Class Temnocephalida
     3 Class Trematoda Rudolphi, 1808 - flukes see Infraclass Trematoda Rudolphi, 1808
     4 Class Cestoda - tapeworms see Infraclass Cestoda