Rhodospirillales

Purple sulfur bacteria
Scientific classification
Kingdom:	Bacteria
Phylum:	Proteobacteria
Class:	Alphaproteobacteria
Order:	Rhodospirillales
Families
Rhodospirillaceae Acetobacteraceae

The Rhodospirillales are an order of Proteobacteria, with two families: the Acetobacteraceae and the Rhodospirillaceae.

The Acetobacteraceae comprise the acetic acid bacteria, which are heterotrophic and produce acetic acid during their respiration. The Rhodospirillaceae include mainly purple nonsulfur bacteria, which produce energy through photosynthesis.