| Genus | Species Num | Strain Num | SOURCE |
|---|---|---|---|
| Abiotrophia | 1 | 1 | HMP |
| Acaryochloris | 1 | 1 | HMP |
| Acetivibrio | 2 | 3 | HMP/MGYG |
| Acetobacter | 1 | 1 | HMP |
| Acetohalobium | 1 | 1 | HMP |
| Acetomicrobium | 1 | 2 | HMP/MGYG |
| Acholeplasma | 1 | 1 | HMP |
| Achromobacter | 2 | 2 | HMP/MGYG |
| Acidaminococcus | 4 | 6 | HMP/MGYG |
| Acidimicrobium | 1 | 1 | HMP |