| Reported in | Status | Registered by | ||
|---|---|---|---|---|
| Cytophaga agarovorans | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Cytobacillus suaedae | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Cystobacter violaceus | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Cystobacter minus | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Cystobacter minor | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Cysteiniphilum marinum | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Cyclobacterium marinus | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Curvibacter fontana | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Curtobacterium testaceum | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Curtobacterium saperdae | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Curtobacterium ginsengisoli | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Cupriavidus yeoncheonense | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Cupriavidus numazuensis | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Cupravidus yeoncheonense | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Cryobacterium mesophilum | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Cronobacter zurichensis | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Cronobacter pulveris | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Cronobacter helveticus | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Croceivirga thetidis | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Croceicoccus hydrothermalis | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Croceicoccus gelatinilyticus | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Croceicoccus estronivorus | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Croceibacterium xixiisoli | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Croceibacterium soli | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Croceibacterium salegens | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Croceibacterium atlanticum | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Cristispira | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Cristispira pectinis | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Crenothrix | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Crenothrix polyspora | Unknown | Valid (ICNP) | Excubia bot over 1 year ago |