sulfolobus islandicus rod-shaped virus 1 sulfolobus islandicus rod-shaped virus 1 sulfolobus islandicus rod-shaped virus 1 (sirv1) is a virus in the order ligamenvirales. its only known host is the archaean sulfolobus islandicus. the species was first documented from a hot spring sample in yellowstone national park. icerudivirus sirv1 virus classification (unranked): virus realm: adnaviria kingdom: zilligvirae phylum: taleaviricota class: tokiviricetes order: ligamenvirales family: rudiviridae genus: icerudivirus species: icerudivirus sirv1 synonyms sulfolobus virus sirv-1 sulfolobus virus sirv1 sulfolobus islandicus rod-shaped virus 1