methanococcoides methanococcoides in taxonomy, methanococcoides is a genus of the methanosarcinaceae. methanococcoides scientific classification domain: archaea kingdom: euryarchaeota phylum: euryarchaeota class: methanomicrobia order: methanosarcinales family: methanosarcinaceae genus: methanococcoides binomial name methanococcoidessowers and ferry 1985 species m. alaskense m. burtonii m. methylutens methanococcoides species are methanogens entirely dependent on methylated compounds for nutrition. the type species of methanococcoides is methanococcoides methylutens.