Clades:
Bacteria.
IntroductionProteobacteria is a Phylum of Gram-negative bacteria. They include a wide variety of pathogenic genera, such as Escherichia, Salmonella, Vibrio, Helicobacter, Yersinia,
Legionellales, and many others. Others are free-living (nonparasitic) and include many of the bacteria responsible for nitrogen fixation.
English: Purple bacteria.
Name: after Proteus, a Greek god of the sea capable of assuming many different shapes; because of the great diversity of forms found in this group.
ClassesAlphaproteobacteriaBetaproteobacteriaGammaproteobacteriaDeltaproteobacteria
EpsilonproteobacteriaZetaproteobacteria
AcidithiobacilliaHydrogenophilaliaOligoflexia