Kingdom Animalia Linnaeus, 1758 - animals
   Phylum Platyhelminthes Gegenbaur, 1859 - flatworms
     Class Turbellaria Ehrenberg, 1831 - planarians see Subphylum Turbellaria Ehrenberg, 1831
       Order Tricladida Lang, 1884
         Genus Bdelloura Leidy, 1851
         Genus Bipalium Stimpson, 1857
         Genus Crenobia Kenk, 1930
         Genus Dugesia Girard, 1850
         Genus Geoplana Müller, 1857
         Genus Polycelis Ehrenberg, 1831
         Genus Procotyla Stimpson, 1857