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 "Betaproteobacteria" Garrity et al., 2006 [monotypic]
                 Class Betaproteobacteriaᵀ Garrity et al. 2006
                   Order Burkholderiales Garrity et al. 2006
                     Family Comamonadaceae Willems et al. 1991
                       Genus Polaromonas Irgens et al. 1996
                         1 Polaromonas vacuolataᵀ Irgens et al. 1996
                         2 Polaromonas naphthalenivorans Jeon et al. 2004
                         3 Polaromonas aquatica Kämpfer et al. 2006
                         4 Polaromonas hydrogenivorans Sizova and Panikov 2007
                         5 Polaromonas jejuensis Weon et al. 2008
                         6 Polaromonas cryoconiti Margesin et al. 2012
                         7 Polaromonas glacialis Margesin et al. 2012