[viruses]
   Realm Riboviria
     Order Nidovirales
       Suborder Tornidovirineae [monotypic]
         Family Tobaniviridae
           Subfamily Serpentovirinae
             1 Genus Infratovirus [monotypic]
             2 Genus Pregotovirus [monotypic]
             3 Genus Sectovirus [monotypic]
             4 Genus Tiruvirus [monotypic]