| Species | RefIntense Num | Refseq Num | Source |
|---|---|---|---|
| Citrobacter youngae | 1 | 18 | HMP |
| Citromicrobium bathyomarinum | 1 | 2 | HMP |
| Clavibacter michiganensis | 1 | 103 | HMP |
| Cloacibacillus evryensis | 1 | 4 | MGYG |
| Cloacibacillus porcorum | 1 | 2 | MGYG |
| Clostridioides difficile | 13 | 2282 | HMP/MGYG |
| Clostridium acetobutylicum | 1 | 18 | HMP |
| Clostridium amazonitimonense | 1 | 1 | MGYG |
| Clostridium baratii | 1 | 14 | MGYG |
| Clostridium beijerinckii | 1 | 237 | HMP |