brachymonas petroleovorans brachymonas petroleovorans brachymonas petroleovorans is a gram-negative, aerobic bacterium from the genus brachymonas and family comamonadaceae, which was isolated from a wastewater plant of a petroleum refinery. b. petroleovorans has the ability to degrade cyclohexane and aromatic compounds such as toluene and m-cresol. brachymonas petroleovorans scientific classification domain: bacteria phylum: pseudomonadota class: betaproteobacteria order: burkholderiales family: comamonadaceae genus: brachymonas species: b. petroleovorans binomial name brachymonas petroleovoransrouviere and chen 2003