Taxonomy
Purple non-sulfur bacteria are found among the alpha and beta subgroups, including:
| Rhodospirillales | |
| Rhodospirillaceae | e.g. Rhodospirillum |
| Acetobacteraceae | e.g. Rhodopila |
| Rhizobiales | |
| Bradyrhizobiaceae | e.g. Rhodopseudomonas palustris |
| Hyphomicrobiaceae | e.g. Rhodomicrobium |
| Rhodobiaceae | e.g. Rhodobium |
| Other families | |
| Rhodobacteraceae | e.g. Rhodobacter |
| Rhodocyclaceae | e.g. Rhodocyclus |
| Comamonadaceae | e.g. Rhodoferax |
Purple sulfur bacteria are included among the gamma subgroup, and make up the order Chromatiales. The similarity between the photosynthetic machinery in these different lines indicates it had a common origin, either from some common ancestor or passed by lateral transfer.
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