comamonas denitrificans comamonas denitrificans comamonas denitrificans is a gram-negative, oxidase- and catalase-positive, motile bacterium with a polar flagellum from the genus comamonas and family comamonadaceae, which was isolated from an activated sludge. its colonies are yellow-white colored. unlike other species of comamonas, c. denitrificans can reduce nitrate to nitrogen gas. comamonas denitrificans scientific classification domain: bacteria phylum: pseudomonadota class: betaproteobacteria order: burkholderiales family: comamonadaceae genus: comamonas species: c. denitrificans binomial name comamonas denitrificansyoung et al. 2008 type strain atcc 700936, ccm 7155, ccug 44425, cip 108016, dahlhammar 123, dsm 17887, kctc 12931, lmg 21602, ncimb 13887