phaeochromatium phaeochromatium phaeochromatium is a genus of bacteria from the family of chromatiaceae with one known species (phaeochromatium fluminis). phaeochromatium scientific classification domain: bacteria phylum: pseudomonadota class: gammaproteobacteria order: chromatiales family: chromatiaceae genus: phaeochromatiumshivali et al. 2012 type species phaeochromatium fluminis species p. fluminis