[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 Neisseriales Tønjum 2006
           Family Neisseriaceae Prévot 1933 (Approved Lists 1980)
             Genus Aquaspirillum Hylemon et al. 1973 (Approved Lists 1980)
               [Aquaspirillum itersonii] (Giesberger 1936) Hylemon et al. 1973 (Approved Lists 1980) see Novispirillum itersonii (Giesberger 1936) Yoon et al. 2007
                 Aquaspirillum itersonii subsp. itersoniiᵀ (Giesberger 1936) Terasaki 1979 (Approved Lists 1980) see Novispirillum itersonii subsp. itersonii (Giesberger 1936) Yoon et al. 2007