| Order | Family | Genus | Species |
|---|---|---|---|
| Acidilobales | 2 | 5 | 47 |
| Candidatus Korarchaeales | 1 | 1 | 4 |
| Candidatus Methanomethylicales | 1 | 2 | 9 |
| Desulfurococcales | 2 | 18 | 96 |
| Fervidicoccales | 1 | 1 | 6 |
| Methanosuratincolales | 1 | 3 | 6 |
| Sulfolobales | 2 | 10 | 166 |
| Tardisphaerales | 1 | 1 | 2 |
| Thermofilales | 1 | 2 | 24 |
| Thermoproteales | 2 | 5 | 102 |