Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         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 Eutreptiina Leedale, 1967
                                 Genus Eutreptiella da Cunha, 1913
                                   Eutreptiella braarudii Throndsen
                                   Eutreptiella eupharyngea Ø. Moestrup & R.E. Norris, 1986
                                   Eutreptiella gymnastica Throndsen
                                   Eutreptiella marinha da Cunha