| Reported in | Status | Registered by | ||
|---|---|---|---|---|
| Romeriopsis navalis T | ||||
| Romeriopsis marina | ||||
| Romboutsia faecis | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Rochalimaea | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Rochalimaea vinsonii | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Rochalimaea quintana T | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Rochalimaea henselae | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Rochalimaea elizabethae | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Robertkochia sediminum | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Riemerella anatipestifera T | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Rickettsiella | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Rickettsiella stethorae | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Rickettsiella popilliae T | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Rickettsiella massiliensis | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Rickettsiella grylli | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Rickettsiella chironomi | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Rickettsia tsutsugamushi | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Rickettsia sennetsu | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Rickettsia rickettsi | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Rickettsia raoultii | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Rickettsia montana | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Rickettsia helvetica | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Rickettsia fournieri | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Rickettsia conorii subsp. heilongjiangensis | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Rickettsia conori | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Rickettsia canada | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Rickettsia buchneri | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Rickettsia amblyommatis | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Rickettsia africae | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Rhodothermus obamensis | Unknown | Valid (ICNP) | Excubia bot over 3 years ago |