| candidatus rickettsia andeanae | subspecies | bacteria | bacteria | species | 273247 |
| candidatus rickettsia tarasevichiae | species | bacteria | bacteria | species | 205075 |
| rickettsia akari | species | bacteria | bacteria | species | 786 |
| rickettsia amblyommatis | species | bacteria | bacteria | species | 33989 |
| rickettsia amblyommatis str. ac/pa | no rank | | | no rank | 1359164 |
| rickettsia asemboensis | species | | | species | 1068590 |
| rickettsia bellii | species | bacteria | bacteria | species | 33990 |
| rickettsia canadensis | species | bacteria | bacteria | species | 788 |
| rickettsia endosymbiont of amblyomma cajennense | species | | | species | 1128630 |
| rickettsia felis | species | bacteria | bacteria | species | 42862 |