| Reported in | Status | Registered by | ||
|---|---|---|---|---|
| Clostridium sporosphaeroides | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Clostridium sporogenes | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Clostridium spiroforme | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Clostridium septicum | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Clostridium senegalense | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Clostridium scindens | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Clostridium schirmacherense | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Clostridium scatologenes | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Clostridium saudiense | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Clostridium sartagoforme | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Clostridium sardiniense | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Clostridium saccharoperbutylacetonicum | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Clostridium saccharogumia | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Clostridium saccharobutylicum | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Clostridium roseum | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Clostridium ramosum | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Clostridium quinii | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Clostridium putrefaciens | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Clostridium puniceum | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Clostridium punense | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Clostridium psychrophilum | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Clostridium prolinivorans | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Clostridium populeti | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Clostridium polysaccharolyticum | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Clostridium polyendosporum | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Clostridium piliforme | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Clostridium phytofermentans | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Clostridium perfringens | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Clostridium peptidivorans | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Clostridium pasteurianum | Unknown | Valid (ICNP) | Excubia bot about 5 years ago |