Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         [[crown] organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
           [Superkingdom Prokaryotae] see Superkingdom Prokarya
             [Kingdom Monera Haeckel 1866] see Domain Bacteria Woese et al. 1990
               [Phylum "chemoautotrophic bacteria"]
                 [Class "oxidizers of nitrogen compounds"] see Phylum Proteobacteria Garrity and Holt 2001
                   1 [Order "Nitrobacteriales"] see Phylum Proteobacteria Garrity and Holt 2001
                   2