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| Species | OMA ID | Cross-ref | OMA Group | (size) |
| [A] Methanosarcina acetivorans | METAC4142 |  Q8TI27 | 70728 | (38) |
| [A] Methanosarcina mazei | METMA1011 | Q8PY38 | 70728 | (38) |
| [A] Methanosarcina barkeri (strain Fusaro / DSM 804) | METBF575 | Q46EW6 | 127403 | (5) |
| [A] Methanococcoides burtonii (strain DSM 6242) | METBU1355 | Q12VX4 | 70728 | (38) |
| [A] Uncultured methanogenic archaeon RC-I | UNCMA2689 | Q0W819 | 70728 | (38) |
| [A] Methanoregula boonei (strain 6A8) | METB61794 | A7I9A7 | 70728 | (38) |