methylocystis heyeri methylocystis heyeri methylocystis heyeri is a gram-negative, aerobic, methanotrophic and non-motile bacterium species from the genus of methylocystis that has been isolated from sphagnum peat in the großer teufelssee in germany. methylocystis heyeri scientific classification domain: bacteria phylum: pseudomonadota class: alphaproteobacteria order: hyphomicrobiales family: methylocystaceae genus: methylocystis species: m. heyeri binomial name methylocystis heyeridedysh et al. 2007 type strain dsm 16984, h2, vkm b-2426