[viruses]
   Realm Riboviria
     Order Nidovirales
       Suborder Arnidovirineae [monotypic]
         Family Arteriviridae
           1 Subfamily Crocarterivirinae [monotypic]
           2 Subfamily Equarterivirinae [monotypic]
           3 Subfamily Heroarterivirinae [monotypic]
           4 Subfamily Simarterivirinae
           5 Subfamily Variarterivirinae
           6 Subfamily Zealarterivirinae [monotypic]