Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
           Domain Bacteria Woese et al. 2024
             Kingdom Pseudomonadati (Gibbons and Murray 1978) Oren and Göker 2024
               Phylum Pseudomonadotaᵀ Garrity et al. 2021
                 Class Betaproteobacteria Garrity et al. 2006
                   Order Spirillales Prévot 1940 (Approved Lists 1980)
                     Family Nitrosomonadaceae Garrity et al. 2006
                       Genus Nitrosomonasᵀ Winogradsky 1892 (Approved Lists 1980) nom. cons.
                         01 Nitrosomonas aestuarii Koops et al. 2001
                         02 Nitrosomonas communis Koops et al. 2001
                         03 Nitrosomonas europaeaᵀ Winogradsky 1892 (Approved Lists 1980)
                         04 Nitrosomonas eutropha Koops et al. 2001
                         05 Nitrosomonas halophila Koops et al. 2001
                         06 Nitrosomonas marina Koops et al. 2001
                         07 "Nitrosomonas mobilis" Garrity et al. 2003 nom. nud.
                         08 Nitrosomonas nitrosa Koops et al. 2001
                         09 Nitrosomonas oligotropha Koops et al. 2001
                         10 Nitrosomonas ureae Koops et al. 2001