| Species | RefIntense Num | Refseq Num | Source |
|---|---|---|---|
| Faecalicatena contorta | 1 | 13 | MGYG |
| Faecalicatena fissicatena | 1 | 8 | MGYG |
| Faecalicatena orotica | 1 | 3 | MGYG |
| Faecalicoccus pleomorphus | 1 | 9 | MGYG |
| Faecalitalea cylindroides | 1 | 10 | MGYG |
| Fannyhessea vaginae | 2 | 4 | HMP/MGYG |
| Fenollaria massiliensis | 1 | 2 | MGYG |
| Fenollaria timonensis | 1 | 1 | MGYG |
| Fervidobacterium nodosum | 1 | 1 | HMP |
| Fibrobacter intestinalis | 1 | 2 | MGYG |