| Deltaproteobacteria | Desulfovibrio vulgaris | |
| Epsilonproteobacteria | Nitratiruptor sp. SB155-2 | |
| Gammaproteobacteria | ||
| Magnetococcus | ||
| Spirochaetes | Spirochaetales | |
| Tenericutes | Mollicutes | |
| Thermotogae | Thermotogales | Fervidobacterium nodosum |
| Verrucomicrobia | Methylacidiphilales | |
| Opitutae | ||
| Verrucomicrobiae |