[viruses]
   Realm Riboviria
     Order Nidovirales
       Suborder Tornidovirineae [monotypic]
         Family Tobaniviridae
           Subfamily Torovirinae [monotypic]
             Genus Torovirus
               Subgenus Renitovirus
                 1 Bovine torovirus
                 2 Equine torovirusᵀ
                 3 Porcine torovirus