| Reported in | Status | Registered by | ||
|---|---|---|---|---|
| Clostridium thermautotrophicum | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Clostridium thermaceticum | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Clostridium thailandense | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Clostridium termitidis | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Clostridium sufflavum | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Clostridium straminisolvens | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Clostridium sticklandii | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Clostridium stercorarium | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Clostridium stercorarium subsp. thermolacticum | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Clostridium stercorarium subsp. stercorarium | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Clostridium stercorarium subsp. leptospartum | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Clostridium sphenoides | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Clostridium sordellii | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Clostridium simiarum | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Clostridium saudii | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Clostridium sartagoformum | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Clostridium sardiniensis | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Clostridium saccharolyticum | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Clostridium rectum | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Clostridium quercicolum | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Clostridium putrificum | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Clostridium purinolyticum | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Clostridium purinilyticum | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Clostridium proteolyticum | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Clostridium proteoclasticum | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Clostridium propionicum | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Clostridium polynesiense | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Clostridium pfennigii | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Clostridium perenne | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Clostridium paraperfringens | Unknown | Valid (ICNP) | Excubia bot over 1 year ago |