| Reported in | Status | Registered by | ||
|---|---|---|---|---|
| Arcobacter antarcticus | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Archaeoglobus neptunius | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Arcanobacterium pyogenes | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Arcanobacterium buesumense | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Arcanobacterium bonasi | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Arcanobacterium bialowiezense | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Arcanobacterium bernardiae | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Arcanobacterium abortisuis | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Arboriscoccus | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Arboriscoccus pini T | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Arachidicoccus terrestris | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Aquisalinus | ||||
| Aquisalinus luteolus | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Aquirufa lenticrescens | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Aquirufa aurantiipilula | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Aquirufa antheringensis T | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Aquipluma | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Aquimarina algicola | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Aquimarina acroporae | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Aquiflexum lacus | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Aquibium | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Aquibium oceanicum | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Aquibium microcysteis T | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Aquibium carbonis | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Aquibacillus saliphilus | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Aquibacillus kalidii | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Aquaspirillum sinuosum | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Aquaspirillum psychrophilum | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Aquaspirillum peregrinum | Unknown | Valid (ICNP) | Excubia bot over 3 years ago | |
| Aquaspirillum peregrinum subsp. peregrinum | Unknown | Valid (ICNP) | Excubia bot over 3 years ago |