| china | | fibrobacter succinogenes | species | 2 | 0 |
| china | | uncultured fibrobacter sp. | species | 3 | 0 |
| china | hunan | uncultured fibrobacter sp. | species | 2 | 0 |
| china | tibet | fibrobacter sp. | species | 3 | 0 |
| egypt | | fibrobacter succinogenes | species | 1 | 0 |
| france | | fibrobacter succinogenes | species | 51 | 0 |
| germany | hamburg | fibrobacter sp. uba1717 | species | 1 | 0 |
| germany | hamburg | fibrobacter sp. uba1765 | species | 1 | 0 |
| india | | fibrobacter succinogenes | species | 15 | 0 |
| india | | uncultured fibrobacter sp. | species | 29 | 0 |
| iran | alborz province | fibrobacter sp. | species | 6 | 0 |
| japan | ibaraki prefecture | fibrobacter sp. rm1 | species | 1 | 0 |
| japan | ibaraki prefecture | fibrobacter succinogenes | species | 3 | 0 |
| nigeria | | uncultured fibrobacter sp. | species | 8 | 0 |
| south korea | | fibrobacter succinogenes | species | 1 | 0 |
| spain | | uncultured fibrobacter sp. | species | 1 | 0 |
| united kingdom | england | uncultured fibrobacter sp. | species | 65 | 0 |
| united states | | fibrobacter intestinalis | species | 2 | 0 |
| united states | | fibrobacter sp. | species | 35 | 0 |
| united states | | fibrobacter succinogenes | species | 8 | 0 |
| united states | | uncultured fibrobacter sp. | species | 2 | 0 |
| united states | wisconsin | fibrobacter sp. uwb1 | species | 94 | 0 |
| united states | wisconsin | fibrobacter sp. uwb2 | species | 32 | 0 |
| united states | wisconsin | fibrobacter sp. uwb3 | species | 42 | 0 |
| united states | wisconsin | fibrobacter sp. uwb4 | species | 38 | 0 |
| united states | wisconsin | fibrobacter sp. uwb5 | species | 36 | 0 |
| united states | wisconsin | fibrobacter sp. uwh1 | species | 194 | 0 |
| united states | wisconsin | fibrobacter sp. uwh3 | species | 126 | 0 |
| united states | wisconsin | fibrobacter sp. uwr2 | species | 42 | 0 |
| united states | wyoming | fibrobacter sp. uba2449 | species | 1 | 0 |