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"
             Order Caudovirales
               Family Herelleviridae
                 Subfamily Twortvirinae
                   1 Genus Twortvirus [monotypic]
                   2.1 Genus Sepunavirus
                   2.2.1 Genus Silviavirus
                   2.2.2 Genus Kayvirus