OrderEubacteriales
| Taxon: | Rank: |
| Caldicoprobacteraceae | family |
| Carboxydocellaceae | family |
| Christensenellaceae | family |
| Defluviitaleaceae | family |
| Desulfitobacteriaceae | family |
| Eubacteriaceae | family |
| Fenollaria | genus |
| Flintibacter | genus |
| Fusibacter | genus |
| Gracilibacteraceae | family |
| Heliobacteriaceae | family |
| Kallipyga | genus |
| Metabacterium | genus |
| Oscillospiraceae | family |
| Peptococcaceae | family |
| Proteinivoracaceae | family |
| Ruminococcaceae | family |
| Sulfobacillus | genus |
| Symbiobacteriaceae | family |
| Syntrophomonadaceae | family |
| Tepidibacteraceae | family |
| Vallitaleaceae | family |