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|
| Species | OMA ID | Cross-ref | OMA Group | (size) |
| [B] Nitrosomonas eutropha (strain C71) | NITEC2152 |  Q0ADS4 | 200657 | (14) |
| [B] Nitrosomonas europaea | NITEU74 | Q82Y16 | 200657 | (14) |
| [B] Alkalilimnicola ehrlichei (strain MLHE-1) | ALHEH949 | Q0AA28 | 200655 | (18) |
| [B] Marinobacter aquaeolei (strain ATCC 700491 / DSM 11845 / VT8) | MARAV1350 | A1U0K3 | 200657 | (14) |
| [B] Nitrosospira multiformis (strain ATCC 25196 / NCIMB 11849) | NITMU694 | Q2YB49 | 200657 | (14) |
| [B] Halorhodospira halophila (strain DSM 244 / SL1) | HALHL1088 | A1WW23 | 200655 | (18) |