| Order | Family | Genus | Species |
|---|---|---|---|
| Acidilobales | 2 | 5 | 47 |
| Candidatus Korarchaeales | 1 | 1 | 2 |
| Candidatus Methanomethylicales | 1 | 2 | 9 |
| Desulfurococcales | 2 | 18 | 92 |
| Fervidicoccales | 1 | 1 | 5 |
| Methanosuratincolales | 1 | 3 | 5 |
| Sulfolobales | 1 | 9 | 157 |
| Thermofilales | 1 | 2 | 21 |
| Thermoproteales | 1 | 5 | 100 |