prokaryotes - bacteria see Domain Bacteria Woese et al. 1990
   Domain "Bacteria" Woese et al. 1990
     Phylum "Proteobacteria" Garrity et al. 2005 see Superphylum Proteobacteria Craig et al. 2010
       Class Gammaproteobacteria Garrity et al. 2005
         Order Methylococcales Bowman 2005
           Family Methylococcaceae Whittenbury and Krieg 1984
             01 Genus Methylobacter Bowman et al. 1993
             02 Genus Methylocaldum Bodrossy et al. 1998
             03 Genus Methylococcus Foster and Davis 1966 (Approved Lists 1980)
             04 Genus Methylogaea Geymonat et al. 2011
             05 Genus Methyloglobulus Deutzmann et al. 2015
             06 Genus Methylohalobius Heyer et al. 2005
             07 Genus Methylomagnum Khalifa et al. 2015
             08 Genus Methylomarinum Hirayama et al. 2013
             09 Genus Methylomicrobium Bowman et al. 1995
             10 Genus Methylomonas (ex Leadbetter 1974) Whittenbury and Krieg 1984
             11 Genus Methyloparacoccus Hoefman et al. 2014
             12 Genus Methyloprofundus Tavormina et al. 2015
             13 Genus Methylosarcina Wise et al. 2001
             14 Genus Methylosoma Rahalkar et al. 2007
             15 Genus Methylosphaera Bowman et al. 1998
             16 Genus Methylothermus Tsubota et al. 2005 nom. inval.
             17 Genus Methylovulum Iguchi et al. 2011