allochromatium allochromatium allochromatium is a genus of bacteria in the family chromatiaceae. allochromatium scientific classification domain: bacteria phylum: pseudomonadota class: gammaproteobacteria order: chromatiales family: chromatiaceae genus: allochromatium species allochromatium humboldtianum allochromatium minutissimum allochromatium phaeobacterium allochromatium renukae allochromatium vinosum allochromatium warmingii