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 Methylomonas (ex Leadbetter 1974) Whittenbury and Krieg 1984
                         1 Methylomonas aurantiaca Bowman et al. 1990
                         2 Methylomonas fodinarum Bowman et al. 1990
                         3 Methylomonas koyamae Ogiso et al. 2012
                         4 Methylomonas lenta Hoefman et al. 2014
                         5 Methylomonas methanicaᵀ (ex Söhngen 1906) Whittenbury and Krieg 1984
                         6 Methylomonas paludis Danilova et al. 2013
                         7 Methylomonas scandinavica Kalyuzhnaya et al. 2000