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| Species | OMA ID | Cross-ref | OMA Group | (size) |
| [A] Pyrobaculum aerophilum | PYRAE847 |  ACYP_PYRAE | 10333 | (41) |
| [A] Thermoproteus neutrophilus (strain DSM 2338 / JCM 9278 / V24Sta) | THENV250 |  B1YB77 | 10333 | (41) |
| [A] Pyrobaculum islandicum (strain DSM 4184 / JCM 9189) | PYRIL1271 | ACYP_PYRIL | 10348 | (7) |
| [A] Pyrobaculum arsenaticum (strain DSM 13514 / JCM 11321) | PYRAR296 | ACYP_PYRAR | 10333 | (41) |
| [B] Laribacter hongkongensis (strain HLHK9) | LARHH2145 | C1D9R9 | 10333 | (41) |
| [B] Desulforudis audaxviator (strain MP104C) | DESAP1085 | B1I448 | 10326 | (71) |