| Species | RefIntense Num | Refseq Num | Source |
|---|---|---|---|
| Clostridium kluyveri | 1 | 3 | HMP |
| Clostridium ljungdahlii | 1 | 3 | HMP |
| Clostridium massiliodielmoense | 1 | 2 | MGYG |
| Clostridium mediterraneense | 1 | 2 | MGYG |
| Clostridium merdae | 1 | 2 | MGYG |
| Clostridium neonatale | 1 | 11 | MGYG |
| Clostridium niameyense | 1 | 3 | MGYG |
| Clostridium nigeriense | 1 | 1 | MGYG |
| Clostridium novyi | 1 | 10 | HMP |
| Clostridium paraputrificum | 1 | 23 | MGYG |