organisms see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   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 Genus Nitrosomonas Winogradsky 1892 (Approved Lists 1980)
           2 Genus Nitrosospira Winogradsky and Winogradsky 1933 (Approved Lists 1980)
           3 Genus Nitrosococcus Winogradsky 1892 (Approved Lists 1980)
           4 Genus Nitrosolobus Watson et al. 1971 (Approved Lists 1980) see Genus Nitrosospira Winogradsky and Winogradsky 1933 (Approved Lists 1980)