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 Picornaviridaeᵀ
                   Genus Aphthovirus
                     1 Equine rhinitis A virus
                     2.1 Bovine rhinitis B virus
                     2.2.1 Foot-and-mouth disease virusᵀ
                     2.2.2 Bovine rhinitis A virus