methylomonas methylomonas methylomonas is a genus of bacteria that obtain their carbon and energy from methane, a metabolic process called methanotrophy. methylomonas scientific classification domain: bacteria phylum: pseudomonadota class: gammaproteobacteria order: methylococcales family: methylococcaceae genus: methylomonas(ex leadbetter 1974) whittenbury and krieg 1984 type species methylomonas methanica species m. aurantiaca m. fodinarum m. koyama m. lenta m. methanica m. paludis m. scandinavica