Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         [crown] Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
           Domain Bacteria Woese et al. 1990 [paraphyletic?]
             Superphylum "Proteobacteria" Craig et al. 2010
               Phylum "Gammaproteobacteria" Garrity et al., 2005 [monotypic]
                 Class Gammaproteobacteriaᵀ Garrity et al. 2005
                   Order Methylococcales Bowman 2005
                     Family Methylococcaceaeᵀ Whittenbury and Krieg 1984
                       Genus Methylomicrobium Bowman et al. 1995
                         1 Methylomicrobium agile (Bowman et al. 1993) Bowman et al. 1995
                         2 Methylomicrobium album (Bowman et al. 1993) Bowman et al. 1995
                         3 Methylomicrobium alcaliphilum Kalyuzhnaya et al. 2008
                         4 Methylomicrobium buryatense Kaluzhnaya et al. 2001
                         5 Methylomicrobium japanense Kalyuzhnaya et al. 2008
                         6 Methylomicrobium kenyense Kalyuzhnaya et al. 2008
                         7 Methylomicrobium pelagicum (Sieburth et al. 1988) Bowman et al. 1995