Class Order Family Genus
Methanobacteria Methanobacteriales
Methanobacteriaceae
Methanothermaceae
Methanobacterium
Methanobrevibacter
Methanosphaera
Methanothermobacter
Methanothermus

Methanococci Methanococcales
Methanocaldococcaceae
Methanococcaceae
Methanocaldococcus
Methanococcus
Methanothermococcus
Methanotorris

Methanomicrobia Methanomicrobiales
Methanocellales
Methanosarcinales
Methanocalculaceae
Methanocellaceae
Methanosarcinaceae
Methanocorpusculaceae
Methanomicrobiaceae
Methanoregulaceae
Methanosaetaceae
Methanospirillaceae
Methermicoccaceae
Methanocalculus
Methanocella
Methanococcoides
Methanocorpusculum
Methanoculleus
Methanofollis
Methanogenium
Methanohalobium
Methanohalophilus
Methanolacinia
Methanolinea
Methanolobus
Methanomethylovorans
Methanomicrobium
Methanimicrococcus
Methanoplanus
Methanoregula
Methanosaeta
Methanosalsum
Methanosarcina
Methanosphaerula
Methanospirillum
Methermicoccus

Methanopyri Methanopyrales
Methanopyraceae
Methanopyrus

Thermoplasmata Methanomassiliicoccales
Methanomassiliicoccaceae
Methanomassiliicoccus