Me
, Metallosphaera , Methanimicrococcus , Methanobacteria , Methanobacteriaceae , Methanobacteriales , Methanobacterium , Methanobrevibacter , Methanocalculus , Methanocaldococcaceae , Methanocaldococcus , Methanococcaceae , Methanococcales , Methanococci , Methanococcoides , Methanococcus , Methanocorpusculaceae , Methanocorpusculum , Methanoculleus , Methanofollis , Methanogenium , Methanohalobium , Methanohalophilus , Methanolacinia , Methanolobus , Methanomethylovorans , Methanomicrobia , Methanomicrobiaceae , Methanomicrobiales , Methanomicrobium , Methanoplanus , Methanopyraceae , Methanopyrales , Methanopyri , Methanopyrus , Methanosaeta , Methanosaetaceae , Methanosalsum , Methanosarcina , Methanosarcinaceae , Methanosarcinales , Methanosphaera , Methanospirillaceae , Methanospirillum , Methanothermaceae , Methanothermobacter , Methanothermococcus , Methanothermus , Methanothrix , Methanotorris