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 Flaviviridae
                 1 Genus Flavivirusᵀ
                 2.1 Genus Pestivirus
                 2.2.1 Genus Hepacivirus
                 2.2.2 Genus Pegivirus