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 Ackermannviridae
                 1 Erwinia virus Ea2809
                 2.1 Serratia virus MAM1
                 2.2.1.1.1 Serratia virus IME250
                 2.2.1.1.2 Klebsiella virus 0507KN21
                 2.2.1.2 Subfamily Aglimvirinae
                 2.2.2 Subfamily Cvivirinae