[viruses]
   Realm Riboviria
     Order Nidovirales
       Suborder Mesnidovirineae
         Family Mesoniviridae [monotypic]
           Subfamily Hexponivirinae [monotypic]
             Genus Alphamesonivirus
               Subgenus Karsalivirus
                 1 Alphamesonivirus 2
                 2 Alphamesonivirus 3