Pseudomonadota
Phylum of Gram-negative bacteria
Pseudomonadota (synonym "Proteobacteria") is a major phylum of gram-negative bacteria. They include both pathogenic and free-living (non-parasitic) genera. The phylum comprises six classes: Acidithiobacillia, Alphaproteobacteria, Betaproteobacteria, Gammaproteobacteria, Hydrogenophilia, and Zetaproteobacteria.
From Wikipedia, under CC BY-SA. More on occurri.