Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         [crown] Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
           Clade neomura Cavalier-Smith, 1987
             Domain Eukaryota Chatton, 1925 - eukaryotes
               Clade discaria Cavalier-Smith, 2021
                 Clade natates Cavalier-Smith, 2021
                   Clade photaria Cavalier-Smith, 2021
                     Clade Discoba Simpson 2009
                       Superphylum Discicristata Cavalier-Smith, 1998 [coordinate rank]
                         Phylum Euglenozoa Cavalier-Smith, 1981
                           Class Euglenoidea Bütschli, 1884
                             Order Euglenidaᵀ Bütschli, 1884 - euglenids
                               Suborder Eugleninaᵀ Bütschli, 1884
                                 Family Euglenidaeᵀ Stein, 1878
                                   Genus Euglenaᵀ C.G. Ehrenberg, 1830
                                     Euglena caudata Huber
                                     Euglena deses Ehrenberg
                                     Euglena gracilis Klebs, 1883
                                     Euglena oxyuris Schmarda
                                     Euglena spirogyra Ehrenberg
                                     Euglena viridis Ehrenberg