methylocystis parvus methylocystis parvus methylocystis parvus is a methylotroph (methane oxidizing) bacterium species from the genus of methylocystis. methylocystis parvus scientific classification domain: bacteria phylum: pseudomonadota class: alphaproteobacteria order: hyphomicrobiales family: methylocystaceae genus: methylocystis species: m. parvus binomial name methylocystis parvusbowman et al. 1993 type strain acm 3309, atcc 35066, imet 10483, ncimb 11129, obbp, obbp acm3309, uniqem 38, vkm b-2129 synonyms methylocystis parva