| Reported in | Status | Registered by | ||
|---|---|---|---|---|
| Arthrobacter celericrescens | Unknown | Valid (ICNP) | Excubia bot over 4 years ago | |
| Arthrobacter castelli | Unknown | Valid (ICNP) | Excubia bot over 4 years ago | |
| Arthrobacter bussei | Unknown | Valid (ICNP) | Excubia bot over 4 years ago | |
| Arthrobacter bambusae | Unknown | Valid (ICNP) | Excubia bot over 4 years ago | |
| Arthrobacter alpinus | Unknown | Valid (ICNP) | Excubia bot over 4 years ago | |
| Arthrobacter alkaliphilus | Unknown | Valid (ICNP) | Excubia bot over 4 years ago | |
| Arthrobacter agilis | Unknown | Valid (ICNP) | Excubia bot over 4 years ago | |
| Arthrobacter | Unknown | Valid (ICNP) | Excubia bot over 4 years ago | |
| Arsukibacterium ikkense T | Unknown | Valid (ICNP) | Excubia bot over 4 years ago | |
| Arsukibacterium | Unknown | Valid (ICNP) | Excubia bot over 4 years ago | |
| Arsenophonus nasoniae T | Unknown | Valid (ICNP) | Excubia bot over 4 years ago | |
| Arsenophonus | ||||
| Morganellaceae | Unknown | Valid (ICNP) | Excubia bot over 4 years ago | |
| Arsenicitalea aurantiaca T | Unknown | Valid (ICNP) | Excubia bot over 4 years ago | |
| Arsenicitalea | Unknown | Valid (ICNP) | Excubia bot over 4 years ago | |
| Devosiaceae | Unknown | Valid (ICNP) | Excubia bot over 4 years ago | |
| Arsenicicoccus piscis | Unknown | Valid (ICNP) | Excubia bot over 4 years ago | |
| Arsenicicoccus dermatophilus | Unknown | Valid (ICNP) | Excubia bot over 4 years ago | |
| Arsenicicoccus bolidensis T | Unknown | Valid (ICNP) | Excubia bot over 4 years ago | |
| Arsenicicoccus | Unknown | Valid (ICNP) | Excubia bot over 4 years ago | |
| Dermatophilaceae | Unknown | Valid (ICNP) | Excubia bot over 4 years ago | |
| Arsenicibacter rosenii T | Unknown | Valid (ICNP) | Excubia bot over 4 years ago | |
| Arsenicibacter | Unknown | Valid (ICNP) | Excubia bot over 4 years ago | |
| Aromatoleum toluvorans | Unknown | Valid (ICNP) | Excubia bot over 4 years ago | |
| Aromatoleum toluolicum | Unknown | Valid (ICNP) | Excubia bot over 4 years ago | |
| Aromatoleum tolulyticum | Unknown | Valid (ICNP) | Excubia bot over 4 years ago | |
| Aromatoleum pumilum | Unknown | Valid (ICNP) | Excubia bot over 4 years ago | |
| Azoarcus | Unknown | Valid (ICNP) | Excubia bot over 4 years ago | |
| Aromatoleum petrolei | Unknown | Valid (ICNP) | Excubia bot over 4 years ago | |
| Aromatoleum evansii | Unknown | Valid (ICNP) | Excubia bot over 4 years ago |