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
         Superphylum Articulata Cuvier see Supraphylum Articulata Cuvier
           Phylum Annelida Lamarck, 1809 - segmented worms
             Class Clitellata Michaelsen, 1919
               Order Oligochaeta (DC.) C. Koch
                 Suborder Plesiopora
                   1 Family Aeolosomatidae Beddard, 1895
                   2 Family Naididae Ehrenberg, 1828 - naidids
                   3 Family Tubificidae Vejdovský, 1876 - sludge worms see Family Naididae Ehrenberg, 1828
                   4 Family Phreodrilidae
                   5 Family Enchytraeidae Vejdovský, 1879