| Rhodocyclales | |
|---|---|
 | |
| Two strains of Zoogloea resiniphila . Wild type is on the left. The right is a strain unable to form floc. | |
Scientific classification  | |
| Domain: | Bacteria |
| Phylum: | Pseudomonadota |
| Class: | Betaproteobacteria |
| Order: | Rhodocyclales Boden et al. 2017 (Garrity, et al 2006) |
| Families | |
The Rhodocyclales [1] are an order of the class Betaproteobacteria in the phylum Pseudomonadota ("Proteobacteria"). [2] Following a major reclassification of the class in 2017, the previously monofamilial order was split into three families:
- Rhodocyclaceae (type family) contains the genera Rhodocyclus (type genus), Azospira and Propionivibrio . Cells are curved rods, rings or spirillae. Dominant respiratory quinones are menaquinone-8, ubiquinone-8 and rhodoquinone-8. G+C fractions are 61.6 - 65.3 mol%. [1]
- Azonexaceae contains the genera Azonexus (type genus), Dechloromonas , Ferribacterium and Quatrionicoccus . Cells are curved rods or cocci. Dominant respiratory quinone is ubiquinone-8. G+C fractions are 63.5 - 67.0 mol%. [1]
- Zoogloeaceae contains the genera Zoogloea (type genus), Thauera , Uliginosibacterium and Azoarcus . Cells are rod shaped. Dominant respiratory quinones are ubiquinone-8 and rhodoquinone-8. G+C fractions are 59.3 - 69.0 mol%. [1]
The genus Azovibrio also falls within the order but is incertae sedis , falling between the Zoogloeaeceae and the Azonexaceae.
