| Reported in | Status | Registered by | ||
|---|---|---|---|---|
| Clostridium pascui | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Clostridium paraputrificum | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Clostridium paradoxum | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Clostridium pabulibutyricum | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Clostridium oryzae | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Clostridium oceanicum | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Clostridium novyi | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Clostridium nitrophenolicum | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Clostridium nitritogenes | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Clostridium nexile | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Clostridium neuense | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Clostridium neonatale | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Clostridium moniliforme | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Clostridium methylpentosum | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Clostridium methoxybenzovorans | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Clostridium manihotivorum | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Clostridium malenominatum | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Clostridium magnum | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Clostridium luticellarii | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Clostridium lundense | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Clostridium ljungdahlii | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Clostridium liquoris | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Clostridium leptum | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Clostridium lacusfryxellense | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Clostridium kluyveri | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Clostridium jeddahense | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Clostridium isatidis | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Clostridium intestinale | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Clostridium innocuum | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Clostridium indicum | Unknown | Valid (ICNP) | Excubia bot about 5 years ago |