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 Caulobacterales Henrici and Johnson 1935 (Approved Lists 1980)
                     Family Caulobacteraceaeᵀ Henrici and Johnson 1935 (Approved Lists 1980)
                       Genus Caulobacterᵀ Henrici and Johnson 1935 (Approved Lists 1980)
                         1 Caulobacter fusiformis Poindexter 1964 (Approved Lists 1980)
                         2 Caulobacter ginsengisoli Liu et al. 2011
                         3 Caulobacter henricii Poindexter 1964 (Approved Lists 1980)
                         4 Caulobacter leidyi corrig. Poindexter 1964 (Approved Lists 1980)
                         5 Caulobacter mirabilis Abraham et al. 2008
                         6 Caulobacter profundus corrig. Jin et al. 2014
                         7 Caulobacter segnis (Urakami et al. 1990) Abraham et al. 1999
                         8 Caulobacter vibrioides Henrici and Johnson 1935 (Approved Lists 1980)