living organisms see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Superkingdom Eukaryotae see Domain Eukaryota Chatton, 1925
     Kingdom Animalia Linnaeus, 1758 - animals
       Subkingdom Eumetazoa Butschli, 1910 see [unranked] Eumetazoa Bütschli, 1910
         Phylum Annelida Lamarck, 1809 - segmented worms
           Class Hirudinoidea see Class Clitellata Michaelsen, 1919
             Subclass Hirudinea see Subclass Euhirudinea Lukin, 1956
               Order Rhynchobdellae see Order Rhynchobdellida Blanchard, 1894
                 1 Family Glossiphoniidae Vaillant, 1890
                 2 Family Piscicolidae Johnston, 1865
                 3 Family Ozobranchidae Pinto, 1921