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 Pospiviroidae
                 1.1 Genus Coleviroid
                 1.2 Genus Apscaviroid
                 2.1.1 Genus Cocadviroid
                 2.1.2 Genus Hostuviroid
                 2.2 Genus Pospiviroidᵀ