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 "Betaproteobacteria" Garrity et al., 2006 [monotypic]
                 Class Betaproteobacteriaᵀ Garrity et al. 2006
                   Order Nitrosomonadales Garrity et al. 2006
                     Family Nitrosomonadaceaeᵀ Garrity et al. 2006
                       Genus Nitrosomonasᵀ Winogradsky 1892 (Approved Lists 1980)
                         Nitrosomonas europaeaᵀ Winogradsky 1892 (Approved Lists 1980)