[Kingdom] Animalia Linnaeus, 1758 - animals
   Grade Enterozoa
     Grade Cœlomata
       Phylum Appendiculata {Lankester}
         Branch Chætopoda
           Class Oligochæta Grube, 1850 - oligochaetes see [unranked] oligochaetous Clitellata
             Order Sœnurina
               1 Genus Tubifex Lamarck, 1816
               2 Genus Enchytræus Henle, 1837