[organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Domain Bacteria Woese et al. 1990
     Phylum "Proteobacteria" Garrity et al. 2005 see Superphylum Proteobacteria Craig et al. 2010
       Class Betaproteobacteria Garrity et al. 2006
         Order Nitrosomonadales Garrity et al. 2006
           Family Nitrosomonadaceae Garrity et al. 2006
             Genus Nitrosomonas Winogradsky 1892 (Approved Lists 1980)
               01 Nitrosomonas europaea Winogradsky 1892 (Approved Lists 1980)
               02 Nitrosomonas aestuarii Koops et al. 2001
               03 Nitrosomonas communis Koops et al. 2001
               04 Nitrosomonas eutropha Koops et al. 2001
               05 Nitrosomonas halophila Koops et al. 2001
               06 Nitrosomonas marina Koops et al. 2001
               07 "Nitrosomonas mobilis"
               08 Nitrosomonas nitrosa Koops et al. 2001
               09 Nitrosomonas oligotropha Koops et al. 2001
               10 Nitrosomonas ureae Koops et al. 2001