Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         [[crown] organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
           [Superkingdom Eukaryonta] see Domain Eukaryota Chatton, 1925
             [Suprakingdom Contophora (T. Christensen, 1962)]
               [Kingdom Chromophytobionta]
                 [Infrakingdom Chromobionta] see Kingdom Chromista Caval.-Sm. (1981)
                   [Phylum Hydraulea (T.L. Jahn & E.C. Bovee, 1965)]