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"
             Family Papillomaviridae
               Subfamily Firstpapillomavirinae
                 Genus Psipapillomavirus
                   1.1 Psipapillomavirus 1ᵀ
                   1.2 Psipapillomavirus 2
                   2 Psipapillomavirus 3