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
               Order Picornavirales
                 Family Secoviridae
                   Genus Waikavirus
                     1? Anthriscus yellows virus
                     2 Maize chlorotic dwarf virus
                     3.1 Rice tungro spherical virusᵀ
                     3.2 Bellflower vein chlorosis virus