| Class | Order | Family | Genus | Species |
|---|---|---|---|---|
| Candidatus Aenigmatarchaeia | 1 | 1 | 1 | 6 |
| Candidatus Altarchaeia | 1 | 1 | 1 | 23 |
| Candidatus Huberarchaeia | 1 | 1 | 1 | 3 |
| Candidatus Iainarchaeia | 1 | 1 | 1 | 5 |
| Candidatus Micrarchaeia | 5 | 6 | 6 | 21 |
| Candidatus Nanoarchaeia | 2 | 3 | 4 | 20 |
| Candidatus Nanohalobia | 1 | 3 | 3 | 6 |
| Candidatus Undinarchaeia | 2 | 2 | 2 | 9 |
| Microcaldia | 1 | 1 | 1 | 1 |
| Nanobdellia | 1 | 1 | 1 | 4 |