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]
           ?"viruses"
             Realm Riboviria
               Family Potyviridae
                 Genus Rymovirus
                   1.1 Hordeum mosaic virus
                   1.2 Agropyron mosaic virus
                   2 Ryegrass mosaic virusᵀ