| Reported in | Status | Registered by | ||
|---|---|---|---|---|
| Okibacterium | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Ohtaekwangia kribbensis | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Ohtaekwangia koreensis T | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Ohtaekwangia | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Oharaeibacter diazotrophicus T | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Oharaeibacter | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Oerskovia turbata T | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Oerskovia paurometabola | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Oerskovia jenensis | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Oerskovia enterophila | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Oerskovia | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Oenococcus oeni T | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Oenococcus kitaharae | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Oenococcus alcoholitolerans | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Oenococcus | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Odoribacter splanchnicus T | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Odoribacter laneus | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Odoribacter denticanis | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Odoribacter | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Octadecabacter temperatus | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Octadecabacter ponticola | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Octadecabacter ascidiaceicola | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Octadecabacter arcticus T | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Octadecabacter antarcticus | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Octadecabacter | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Ochrobactrum teleogrylli | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Ochrobactrum | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Oceanotoga teriensis T | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Oceanotoga | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Oceanospirillum vagum | Unknown | Valid (ICNP) | Excubia bot about 5 years ago |