Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
           ?"viruses"
             ["bacterial viruses"]
               [Family Pedoviridae] see Family Podoviridae
                 [unranked] "T7 Phage Group"ᵀ
                   "phage Y"