Kingdom [Animalia] Linnaeus, 1758 - animals
   Subkingdom Metazoa Haeckel, 1874 see Kingdom Animalia Linnaeus, 1758
     Division Eumetazoa Butschli, 1910 see Subkingdom Eumetazoa Butschli, 1910
       Subdivision Bilateralia
         Phylum Platy-helminthes see Phylum Platyhelminthes Gegenbaur, 1859
           Class Turbellaria Ehrenberg, 1831 - planarians see Subphylum Turbellaria Ehrenberg, 1831
             Superorder Neoophora see Class Neoophora
               Order Seriata
                 Suborder Tricladida Lang, 1884 see Order Tricladida Lang, 1884
                   Paludicola Hallez, 1892
                     Genus Dugesia Girard, 1850
                       1 Dugesia gonocephala Dugès, 1830
                       2 Dugesia lugubris (Schmidt, 1861)
                       3 Dugesia dorotocephala (Woodworth, 1897)