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|
| Species | OMA ID | Cross-ref | OMA Group | (size) |
| [B] Oligotropha carboxidovorans (strain ATCC 49405 / DSM 1227 / OM5) | OLICO460 |  AROA_OLICO | 210150 | (240) |
| [B] Rhodopseudomonas palustris | RHOPA61 | AROA_RHOPA | 210159 | (51) |
| [B] Rhodopseudomonas palustris (strain TIE-1) | RHOPT64 | AROA_RHOPT | 210159 | (51) |
| [B] Rhodopseudomonas palustris (strain BisB18) | RHOPB396 |  Q21CB1 | 210159 | (51) |
| [B] Nitrobacter winogradskyi (strain Nb-255 / ATCC 25391) | NITWN205 | AROA_NITWN | 210159 | (51) |
| [B] Nitrobacter hamburgensis (strain X14 / DSM 10229) | NITHX162 | AROA_NITHX | 210159 | (51) |