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
               Order Picornavirales
                 Family Picornaviridaeᵀ
                   Genus Megrivirus
                     1.1.1 Megrivirus Aᵀ
                     1.1.2 Megrivirus B
                     1.2.1 Megrivirus C
                     1.2.2 Megrivirus E
                     2 Megrivirus D