Kingdom [Animalia] Linnaeus, 1758 - animals
   Subkingdom Protozoa Goldfuss, 1818 see Kingdom Protozoa Goldfuss, 1818
     Class Flagellata see Subphylum Mastigophora Diesing, 1866
       Order Euglenoidina Bütschli, 1884 see Order Euglenida Bütschli, 1884
         Family Euglenidae Stein, 1878
           Genus [Euglena] C.G. Ehrenberg, 1830
             1 Euglena viridis Ehrenberg
             2 Euglena gracilis Klebs, 1883