Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         [crown] Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
           Domain Bacteria Woese et al. 1990 [paraphyletic?]
             Superphylum "Proteobacteria" Craig et al. 2010
               Phylum "Alphaproteobacteria" Garrity et al., 2006 [monotypic]
                 Class Alphaproteobacteriaᵀ Garrity et al. 2006
                   Order Rhodospirillales Pfennig and Trüper 1971 (Approved Lists 1980)
                     Family Rhodospirillaceae Pfennig and Trüper 1971 (Approved Lists 1980)
                       Genus Azospirillum Tarrand et al. 1979 (Approved Lists 1980)
                         01 Azospirillum amazonense Magalhães et al. 1984
                         02 Azospirillum brasilense corrig. Tarrand et al. 1979 (Approved Lists 1980)
                         03 Azospirillum canadense Mehnaz et al. 2007
                         04 Azospirillum doebereinerae Eckert et al. 2001
                         05 Azospirillum formosense Lin et al. 2012
                         06 Azospirillum halopraeferens Reinhold et al. 1987
                         07 Azospirillum largimobile corrig. (Skerman et al. 1983) Ben Dekhil et al. 1997
                         08 Azospirillum lipoferumᵀ (Beijerinck 1925) Tarrand et al. 1979 (Approved Lists 1980)
                         09 Azospirillum melinis Peng et al. 2006
                         10 Azospirillum oryzae Xie and Yokota 2005
                         11 Azospirillum picis Lin et al. 2009
                         12 Azospirillum rugosum Young et al. 2008
                         13 Azospirillum thiophilum Lavrinenko et al. 2010
                         14 Azospirillum zeae Mehnaz et al. 2007