| Reported in | Status | Registered by | ||
|---|---|---|---|---|
| Colwellia maritima | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Colwellia hadaliensis | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Colwellia demingae | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Collinsella ihumii | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Collimonas silvisoli | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Collimonas humicola | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Cohnella zeiphila | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Cohnella herbarum | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Cohnella damensis | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Cognatiyoonia sediminum | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Cognaticolwellia | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Cognaticolwellia sediminilitoris | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Cognaticolwellia mytili | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Cognaticolwellia beringensis | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Cognaticolwellia aestuarii T | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Cognatazoarcus | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Cognatazoarcus halotolerans T | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Cognataquiflexum | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Cognataquiflexum rubidum | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Cognataquiflexum nitidum | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Cognataquiflexum aquatile T | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Cochlodiniinecator | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Cochlodiniinecator piscidefendens T | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Clostridium zeae | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Clostridium xylanovorans | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Clostridium xylanolyticum | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Clostridium weizhouense | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Clostridium villosum | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Clostridium ventriculi | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Clostridium ultunense | Unknown | Valid (ICNP) | Excubia bot about 3 years ago |