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 Nitrosospira Winogradsky and Winogradsky 1933 (Approved Lists 1980)
                         1 Nitrosospira briensisᵀ Winogradsky and Winogradsky 1933 (Approved Lists 1980)
                         2 Nitrosospira lacus Urakawa et al. 2015
                         3 Nitrosospira multiformis (Watson et al. 1971) Head et al. 1995
                         4 Nitrosospira tenuis (ex Harms et al. 1976) Head et al. 1995