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| Species | OMA ID | Cross-ref | OMA Group | (size) |
| [A] Thermoproteus neutrophilus (strain DSM 2338 / JCM 9278 / V24Sta) | THENV507 |  B1YCF3 | 63842 | (10) |
| [A] Pyrobaculum islandicum (strain DSM 4184 / JCM 9189) | PYRIL1427 | A1RUI1 | 63842 | (10) |
| [A] Pyrobaculum calidifontis (strain JCM 11548 / VA1) | PYRCJ463 | A3MTD6 | 63842 | (10) |
| [B] Desulfatibacillum alkenivorans (strain AK-01) | DESAA1148 | B8F9C5 | 219532 | (3) |