| uncultured acidilobus sp. | no rank | archaea | environmental samples | species | 242694 |
| uncultured aeropyrum sp. | no rank | archaea | environmental samples | species | 269242 |
| uncultured caldivirga sp. | no rank | | | species | 1434682 |
| uncultured ignisphaera sp. | no rank | | | species | 529699 |
| uncultured metallosphaera sp. | no rank | archaea | environmental samples | species | 221076 |
| uncultured pyrobaculum sp. | no rank | archaea | environmental samples | species | 398234 |
| uncultured sulfolobus sp. | no rank | archaea | environmental samples | species | 159090 |
| uncultured thermofilum sp. | no rank | archaea | environmental samples | species | 310083 |
| uncultured thermoproteus sp. | no rank | archaea | environmental samples | species | 310086 |
| uncultured vulcanisaeta sp. | no rank | archaea | environmental samples | species | 310064 |