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 Alphaproteobacteria Garrity et al. 2006
                   Order Rhodospirillales Pfennig and Trüper 1971 (Approved Lists 1980)
                     Family Azospirillaceae Hördt et al. 2020
                       01 Genus Arenibaculum Li et al. 2021
                       02 Genus Azospirillumᵀ Tarrand et al. 1979 (Approved Lists 1980)
                       03 Genus Desertibacter Liu et al. 2011 [monotypic]
                       04 Genus Deserticella Li et al. 2021
                       05 Genus Elstera Rahalkar et al. 2012 [monotypic]
                       06 Genus Inquilinus Coenye et al. 2002
                       07 Genus Lacibacterium Sheu et al. 2013 [monotypic]
                       08 Genus Nitrospirillum Lin et al. 2015
                       09 Genus Niveispirillum Lin et al. 2014
                       10 Genus Rhodocista Kawasaki et al. 1994
                       11 Genus Skermanella Sly and Stackebrandt 1999