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| Species | OMA ID | Cross-ref | OMA Group | (size) |
| [B] Polaromonas sp. (strain JS666 / ATCC BAA-500) | POLSJ471 |  Q12GA3 | 187170 | (48) |
| [B] Nitrosomonas europaea | NITEU379 | Q82X95 | 187164 | (52) |
| [B] Nitrosomonas eutropha (strain C71) | NITEC2017 | Q0AE62 | 187170 | (48) |
| [B] Verminephrobacter eiseniae (strain EF01-2) | VEREI2258 | A1WKB5 | 187163 | (61) |