Rhodocyclales

Rhodocyclaceae
Scientific classification
Kingdom:	Bacteria
Phylum:	Proteobacteria
Class:	Betaproteobacteria
Order:	Rhodocyclales
Family:	Rhodocyclaceae
Genera and species
Aromatoleum Aromatoleum aromaticum Azoarcus Azoarcus anaerobius Azoarcus buckelii Azoarcus communis Azoarcus evansii Azoarcus indigens Azoarcus olearius Azoarcus toluclasticus Azoarcus tolulyticus Azoarcus toluvorans Azonexus Azonexus caeni Azonexus fungiphilus Azonexus hydrophilus Azospira Azospira oryzae Azovibrio Azovibrio restrictus Dechloromonas Dechloromonas agitata Dechloromonas aromatica Denitratisoma Denitratisoma oestradiolicum Ferribacterium Ferribacterium limneticum Methyloversatilis Methyloversatilis discipulorum Methyloversatilis thermotolerans Methyloversatilis universalis Petrobacter Petrobacter succinatimandens Propionivibrio Propionivibrio dicarboxylicus Propionivibrio limicola Propionivibrio pelophilus Quadricoccus Quadricoccus australiensis Rhodocyclus Rhodocyclus purpureus Rhodocyclus tenuis Sterolibacterium Sterolibacterium denitrificans Thauera Zoogloea Zoogloea ramigera Zoogloea resiniphila

The Rhodocyclaceae are a family of gram-negative bacteria. They are given their own order in the beta subgroup of Proteobacteria, and include many genera previously assigned to the family Pseudomonadaceae.

The family contains mainly aerobic or denitrifying rod-shaped bacteria , which exhibit very versatile metabolic capabilities. Most species live in aquatic habitats and prefer oligotrophic conditions. Many, for example species of Zoogloea and Azoarcus, occur in waste water and play an important role in biological remediation in waste water treatment. The name-giving genus Rhodocyclus is rather atypical for the group, being the only phototroph among them. Rhodocyclus sp. are performing anoxygenic photosynthesis under anoxic conditions in a similar way as other bacterial genera among the alpha-Proteobacteria. The species Rhodocyclus purpureus also deviates from the other known members of the family (including other Rhodocyclus species) in its ring-shaped cell form, which brings the two cell poles close to each other and has inspired the genus name.

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Wikipedia