| Name | Genomes | Species | Genera | Families | Orders |
| Alphafusellovirus | 46 | 10 | 1 | 0 | 0 |
| · Sulfolobus spindle-shaped virus 1 | 1 | 1 | 0 | 0 | 0 |
| · Sulfolobus spindle-shaped virus 2 | 1 | 1 | 0 | 0 | 0 |
| · Sulfolobus spindle-shaped virus 4 | 1 | 1 | 0 | 0 | 0 |
| · Sulfolobus spindle-shaped virus 5 | 1 | 1 | 0 | 0 | 0 |
| · Sulfolobus spindle-shaped virus 7 | 1 | 1 | 0 | 0 | 0 |
| · Sulfolobus spindle-shaped virus 8 | 1 | 1 | 0 | 0 | 0 |
| · Sulfolobus spindle-shaped virus 9 | 1 | 1 | 0 | 0 | 0 |
| · unclassified Alphafusellovirus | 39 | 3 | 0 | 0 | 0 |