[organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Domain Bacteria Woese et al. 1990 stat. inval. see Domain Bacteria Woese et al. 2024
     Phylum "Proteobacteria" Garrity et al. 2005 stat. inval. see Phylum Pseudomonadota Garrity et al. 2021
       Class Betaproteobacteria Garrity et al. 2006
         Order Nitrosomonadales Garrity et al. 2006 nom. illeg. see Order Spirillales Prévot 1940 (Approved Lists 1980)
           Family Nitrosomonadaceae Garrity et al. 2006
             Genus Nitrosospira Winogradsky and Winogradsky 1933 (Approved Lists 1980)
               Nitrosospira multiformis (Watson et al. 1971) Head et al. 1995