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 "Alphaproteobacteria" Garrity et al., 2006 [monotypic]
                 Class Alphaproteobacteriaᵀ Garrity et al. 2006
                   Order Rhizobiales Kuykendall 2006
                     Family Beijerinckiaceae Garrity et al. 2006
                       Genus Methylocella Dedysh et al. 2000
                         1 Methylocella palustrisᵀ Dedysh et al. 2000
                         2 Methylocella silvestris Dunfield et al. 2003
                         3 Methylocella tundrae Dedysh et al. 2004