| Reported in | Status | Registered by | ||
|---|---|---|---|---|
| Oxalophagus | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Oxalobacter vibrioformis | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Oxalobacter formigenes T | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Oxalobacter | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Oxalicibacterium solurbis | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Oxalicibacterium horti | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Oxalicibacterium flavum T | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Oxalicibacterium faecigallinarum | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Oxalicibacterium | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Owenweeksia hongkongensis T | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Owenweeksia | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Ottowia thiooxydans T | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Ottowia pentelensis | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Ottowia oryzae | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Ottowia konkukae | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Ottowia flava | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Ottowia beijingensis | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Ottowia | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Otariodibacter oris T | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Otariodibacter | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Oscillochloris trichoides | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Oscillochloris | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Oscillochloridaceae | ||||
| Oscillibacter valericigenes T | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Oscillibacter ruminantium | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Oscillibacter | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Oryzomonas sagensis | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Oryzomonas rubra | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Oryzomonas japonica T | Unknown | Valid (ICNP) | Excubia bot about 5 years ago | |
| Oryzomonas | Unknown | Valid (ICNP) | Excubia bot about 5 years ago |