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| Species | OMA ID | Cross-ref | OMA Group | (size) |
| [A] Pyrobaculum calidifontis (strain JCM 11548 / VA1) | PYRCJ982 |  A3MUV5 | 33982 | (12) |
| [A] Pyrobaculum arsenaticum (strain DSM 13514 / JCM 11321) | PYRAR1712 | A4WLR5 | 33192 | (29) |
| [A] Staphylothermus marinus (strain ATCC 43588 / DSM 3639 / F1) | STAMF222 | A3DL26 | 33192 | (29) |
| [A] Thermofilum pendens (strain Hrk 5) | THEPD633 | A1RXW3 | 33982 | (12) |
| [A] Thermoproteus neutrophilus (strain DSM 2338 / JCM 9278 / V24Sta) | THENV1652 | B1YAG2 | 33192 | (29) |
| [A] Pyrobaculum islandicum (strain DSM 4184 / JCM 9189) | PYRIL425 | A1RRM7 | 33192 | (29) |
| [A] Pyrobaculum aerophilum | PYRAE2126 | Q8ZTY7 | 36162 | (8) |