0.90 Methanocalculus natronophilus Methanocalculus taiwanensis 1 Methanocalculus pumilus Methanocalculus chunghsingensis 1 Methanocalculus halotolerans Methanocorpusculum labreanum 1 Methanocorpusculum bavaricum 0.90 Methanocorpusculum sinense Methanocorpusculum aggregans Methanocorpusculum parvum Methanoculleus receptaculi 1 Methanoculleus palmolei Methanoculleus bourgensis 0.93 Methanoculleus sediminis 0.96 0.99 Methanoculleus marisnigri 1 Methanoculleus submarinus Methanoculleus chikugoensis Methanoculleus horonobensis Methanoculleus hydrogenitrophicus 1 Methanoculleus thermophilus 1 Methanoplanus petrolearius 0.95 Methanolacinia paynteri Methanomicrobiales 1 Methanomicrobium mobile Methanoplanus endosymbiosus 1 Methanoplanus limicola 1 Methanogenium organophilum 1 Methanogenium cariaci Methanogenium frigidum Methanogenium boonei 1 Methanogenium marinum 1 Methanofollis formosanus Methanofollis aquaemaris 1 Methanofollis ethanolicus 1 Methanofollis liminatans 1 Methanofollis tationis Methanosphaerula palustris Methanolinea tarda 1 1 Methanoregula boonei 1 Methanoregula formicica 1 1 Methanolinea mesophila 1 Methanospirillum hungatei Methanospirillum stamsii 1 Methanospirillum lacunae 1 Methanospirillum psychrodurum Methanomicrobia 1 Methanocella conradii 1 Methanocella paludicola Methanocellales Methanocella arvoryzae Methermicoccus shengliensis 1 0.98 Methanosaeta harundinacea 1 Methanosaeta pelagica Methanosaeta thermophila 1 1 Methanosaeta concilii 1 Methanohalobium evestigatum Methanosalsum zhilinae 0.97 Methanohalophilus halophilus 0.91 Methanohalophilus portucalensis 1 Methanohalophilus mahii 1 Methanohalophilus euhalobius 1 Methanohalophilus levihalophilus 0.99 Methanococcoides alaskense 1 Methanococcoides burtonii 1 Methanococcoides methylutens 0.97 Methanococcoides vulcani 1 0.90 Methanolobus bombayensis 1 Methanolobus tindarius 1 1 Methanolobus vulcani 1 Methanolobus profundi Methanosarcinales Methanolobus taylorii 1 Methanolobus oregonensis Methanolobus psychrophilus Methanolobus zinderi Methanomethylovorans hollandica 1 Methanomethylovorans thermophila Methanomethylovorans uponensis Methanimicrococcus blatticola 1 Methanosarcina baltica 1 Methanosarcina semesiae 1 Methanosarcina lacustris 0.95 Methanosarcina siciliae 1 Methanosarcina acetivorans 1 1 Methanosarcina mazei 0.98 Methanosarcina soligelidi Methanosarcina horonobensis 0.98 Methanosarcina thermophila Methanosarcina barkeri Methanosarcina spelaei Methanosarcina vacuolata Methanomassiliicoccus luminyensis Methanomassiliicoccales, Thermoplasmata 1 Methanothermus fervidus Methanothermus sociabilis 1 Methanothermobacter crinale Methanothermobacter tenebrarum 1 Methanothermobacter thermautotrophicus Methanothermobacter marburgensis 1 Methanothermobacter wolfeii Methanothermobacter thermoflexus 1 1 Methanothermobacter defluvii 0.98 Methanothermobacter thermophilus Methanobacterium thermaggregans 1 0.98 Methanobrevibacter gottschalkii 1 Methanobrevibacter thaueri Methanobrevibacter millerae 1 Methanobrevibacter oralis 1 Methanobrevibacter smithii 0.92 Methanobrevibacter woesei 0.99 Methanobrevibacter olleyae 1 Methanobrevibacter ruminantium 1 1 Methanobrevibacter boviskoreani 1 Methanobrevibacter wolinii 1 Methanobrevibacter acididurans 0.96 Methanobrevibacter arboriphilus Methanobrevibacter cuticularis 1 Methanobacteriales, Methanobacteria 1 Methanobrevibacter curvatus Methanobrevibacter filiformis 1 Methanobacterium flexile Methanobacterium alcaliphilum 1 Methanobacterium movens 1 Methanobacterium aarhusense Methanobacterium congolense Methanobacterium formicicum 1 Methanobacterium subterraneum 1 Methanobacterium palustre 1 Methanobacterium ferruginis 0.90 Methanobacterium kanagiense 1 Methanobacterium petrolearium 1 Methanosphaera cuniculi Methanosphaera stadtmanae 1 Methanobacterium lacus Methanobacterium beijingense Methanobacterium movilense 0.95 Methanobacterium oryzae Methanobacterium ivanovii 1 Methanobacterium veterum 1 Methanobacterium espanolae Methanobacterium arcticum Methanobacterium bryantii 1 Methanobacterium uliginosum 0.96 Methanocaldococcus fervens 1 Methanocaldococcus jannaschii 1 Methanocaldococcus vulcanius 1 Methanocaldococcus indicus 1 Methanocaldococcus infernus Methanocaldococcus villosus 1 Methanotorris igneus Methanococcales, Methanococci Methanotorris formicicus 1 Methanothermococcus thermolithotrophicus 1 1 Methanococcus aeolicus 1 Methanothermococcus okinawensis 1 Methanococcus maripaludis 1 Methanococcus vannielii Methanococcus voltae Methanopyrus kandleri Methanopyrales, Methanopyri The phylogenetic tree obtained in MrBayes for 16S rRNA sequences of methanogens. Particular taxonomic groups were indicated in different colors. Values at nodes indicate posterior probabilities. The values smaller than 0.9 were omitted..