| Reported in | Status | Registered by | ||
|---|---|---|---|---|
| Aquaspirillum autotrophicum | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Aquaspirillum aquaticum | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Aquaspirillum anulus | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Aquariibacter | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Aquariibacter albus T | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Aquabacterium terrae | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Apilactobacillus zhangqiuensis | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Apilactobacillus xinyiensis | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Apilactobacillus kosoi | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Apilactobacillus bombintestini | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Apilactobacillus apisilvae | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Antrihabitans stalagmiti | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Anthropogastromicrobium | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Anthropogastromicrobium aceti T | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Anoxybacillus pushchinensis | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Anoxybacillus karvacharensis | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Anoxabacillus pushinensis | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Angiococcus | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Angiococcus disciformis T | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Aneurinibacillus aneurinolyticus | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Ancylobacter gelatini | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Ancalochloris | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Ancalochloris perfilievii T | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Anatilimnocola | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Anatilimnocola aggregata T | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Anaplasma phagocytophila | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Anaplasma ovis | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Anaplasma marginale T | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Anaplasma centrale | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Anaplasma caudatum | Unknown | Valid (ICNP) | Excubia bot about 3 years ago |