| Reported in | Status | Registered by | ||
|---|---|---|---|---|
| Chromatium minus | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Chromatium gracile | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Chromatium glycolicum | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Chromatium buderi | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Christensenella tenuis | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Chordicoccus | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Chordicoccus furentiruminis T | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Chondromyces catenulatus | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Chloronema | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Chloronema giganteum T | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Chlorobium vibrioforme | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Chlorobium tepidum | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Chlorobium chlorovibrioides | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Chlamydophila | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Chlamydophila psittaci T | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Chlamydophila pneumoniae | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Chlamydophila pecorum | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Chlamydophila felis | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Chlamydophila caviae | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Chlamydophila abortus | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Chlamydia poikilotherma | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Chitinophaga rhizophila | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Chitinophaga hostae | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Chioneia | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Chioneia hiemis | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Chioneia frigida T | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Chioneia brumae | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Chioneia algoris | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Chimaereicella | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Chimaereicella boritolerans | Unknown | Valid (ICNP) | Excubia bot over 3 years ago |