living 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
       Division Bacteria (Haeckel 1894) see Domain Bacteria Woese et al. 1990
         "Gram-negative, chemolithotrophic bacteria"
           Family Nitrobacteraceae Buchanan 1917 (Approved Lists 1980) see Family Bradyrhizobiaceae Garrity et al. 2001 nom. ined.
             1 Genus Nitrobacter Winogradsky 1892 (Approved Lists 1980)
             2 Genus Nitrospina Watson and Waterbury 1971 (Approved Lists 1980)
             3 Genus Nitrococcus Watson and Waterbury 1971 (Approved Lists 1980)
             4 Genus Nitrosomonas Winogradsky 1892 (Approved Lists 1980)
             5 Genus Nitrosospira Winogradsky and Winogradsky 1933 (Approved Lists 1980)
             6 Genus Nitrosococcus Winogradsky 1892 (Approved Lists 1980)
             7 Genus Nitrosolobus Watson et al. 1971 (Approved Lists 1980) see Genus Nitrosospira Winogradsky and Winogradsky 1933 (Approved Lists 1980)
             8 Genus Nitrosovibrio Harms et al. 1976