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| Species | OMA ID | Cross-ref | OMA Group | (size) |
| [B] Xanthobacter autotrophicus (strain ATCC BAA-1158 / Py2) | XANP2757 |  A7IDG6 | 28773 | (38) |
| [B] Ochrobactrum anthropi (strain ATCC 49188 / DSM 6882 / NCTC 12168) | OCHA43100 | A6X3Q1 | 28773 | (38) |
| [B] Acidiphilium cryptum (strain JF-5) | ACICJ3199 | A5FTH3 | 29781 | (13) |
| [B] Nitrobacter hamburgensis (strain X14 / DSM 10229) | NITHX3519 | Q1QH09 | 28773 | (38) |
| [B] Beijerinckia indica subsp. indica (strain ATCC 9039 / DSM 1715 / NCIB 8712) | BEII92704 | B2IJZ6 | 29781 | (13) |
| [B] Caulobacter sp. (strain K31) | CAUSK5116 | B0T9E6 | 28773 | (38) |