[viruses]
   Family Fuselloviridae
     Genus Alphafusellovirus
       1 Sulfolobus spindle-shaped virus 1ᵀ
       2 Sulfolobus spindle-shaped virus 2
       3 Sulfolobus spindle-shaped virus 4
       4 Sulfolobus spindle-shaped virus 5
       5 Sulfolobus spindle-shaped virus 7
       6 Sulfolobus spindle-shaped virus 8
       7 Sulfolobus spindle-shaped virus 9