| Reported in | Status | Registered by | ||
|---|---|---|---|---|
| Aquaspirillum itersonii subsp. nipponicum | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Aquaspirillum itersonii subsp. itersonii | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Aquaspirillum gracile | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Aquaspirillum giesbergeri | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Aquaspirillum fasciculus | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Aquaspirillum dispar | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Aquaspirillum delicatum | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Aquaspirillum bengal | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Aquaspirillum autotrophicum | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Aquaspirillum aquaticum | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Aquaspirillum anulus | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Aquariibacter | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Aquariibacter albus | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Aquabacterium terrae | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Apilactobacillus zhangqiuensis | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Apilactobacillus xinyiensis | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Apilactobacillus kosoi | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Apilactobacillus bombintestini | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Apilactobacillus apisilvae | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Antrihabitans stalagmiti | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Anthropogastromicrobium | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Anthropogastromicrobium aceti | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Anoxybacillus pushchinensis | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Anoxybacillus karvacharensis | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Anoxabacillus pushinensis | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Angiococcus | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Angiococcus disciformis | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Aneurinibacillus aneurinolyticus | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Ancylobacter gelatini | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Ancalochloris | Unknown | Valid (ICNP) | Excubia bot over 1 year ago |