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
               Phylum Negarnaviricota
                 Subphylum Polyploviricotina
                   Class Insthoviricetes [monotypic]
                     Order Articulavirales
                       Family Orthomyxoviridae
                         Genus Alphainfluenzavirus [monotypic]
                           Influenza A virusᵀ
                             avian influenza A(H9N2) virus
                               (Isolate) human influenza A/Hong Kong/1074/99 (H9N2) virus