| Reported in | Status | Registered by | ||
|---|---|---|---|---|
| Clostridium sphenoides | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Clostridium sordellii | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Clostridium simiarum | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Clostridium saudii | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Clostridium sartagoformum | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Clostridium sardiniensis | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Clostridium saccharolyticum | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Clostridium rectum | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Clostridium quercicolum | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Clostridium putrificum | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Clostridium purinolyticum | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Clostridium purinilyticum | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Clostridium proteolyticum | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Clostridium proteoclasticum | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Clostridium propionicum | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Clostridium polynesiense | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Clostridium pfennigii | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Clostridium perenne | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Clostridium paraperfringens | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Clostridium papyrosolvens | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Clostridium oxalicum | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Clostridium oroticum | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Clostridium orbiscindens | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Clostridium neopropionicum | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Clostridium muellerianum | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Clostridium mobile | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Clostridium mayombei | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Clostridium maximum | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Clostridium mangenotii | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Clostridium lortetii | Unknown | Valid (ICNP) | Excubia bot over 3 years ago |