| Name | Children | Media (from resource) | Traits |
|---|---|---|---|
| Acidianus | 0 | 0 | 0 |
| Acidianus brierleyi | 0 | 0 | 0 |
| Acidianus infernus | 0 | 0 | 0 |
| Acidianus infernus | 0 | 0 | 0 |
| Aciduliprofundum | 0 | 0 | 0 |
| Aciduliprofundum boonei | 0 | 0 | 0 |
| Aciduliprofundum boonei | 0 | 0 | 0 |
| Aeropyrum | 1 | 0 | 0 |
| Aeropyrum pernix | 0 | 0 | 0 |
| Aeropyrum pernix | 0 | 0 | 0 |
| Archaea | 4 | 0 | 0 |
| Archaeoglobaceae | 2 | 0 | 0 |
| Archaeoglobales | 1 | 0 | 0 |
| Archaeoglobi | 1 | 0 | 0 |
| Archaeoglobus | 3 | 0 | 0 |
