[viruses]
   Order Ortervirales
     Family Retroviridae
       Subfamily Spumaretrovirinae
         1 Genus Bovispumavirus [monotypic]
         2 Genus Equispumavirus [monotypic]
         3 Genus Felispumavirus [monotypic]
         4 Genus Prosimiispumavirus [monotypic]
         5 Genus Simiispumavirus