 "P. stutzeri" has been isolated in many different locations, and since each strain is a little different based on where it was isolated, the "P. stutzeri" group contains many genomovars.This means that the many strains of "P. stutzeri" can be considered genospecies, which are organisms that can only be differentiated based on their nucleic acid composition.Burri and Stutzer first described "P. stutzeri" in 1895 and named the bacterium "Bacillus denitrificans II".