rhodomicrobium rhodomicrobium rhodomicrobium is a microaerobic to anaerobic, purple non-sulfur, cluster-building genus of bacteria. rhodomicrobium uses bacteriochlorophyll a and bacteriochlorophyll b for photosynthesis and occurs in fresh- and sea-water and in soil rhodomicrobium scientific classification domain: bacteria phylum: pseudomonadota class: alphaproteobacteria order: hyphomicrobiales family: hyphomicrobiaceae genus: rhodomicrobiumduchow and douglas 1949 type species rhodomicrobium vannielii species r. udaipurense r. vannielii