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"
             Subgroup B
               "cherry rugose mosaic virus"
               "Danish plum line pattern virus"
               "hop virus A"
               "hop virus C"
               "rose mosaic virus"