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 "Gammaproteobacteria" Garrity et al., 2005 [monotypic]
                 Class Gammaproteobacteriaᵀ Garrity et al. 2005
                   Order Arenicellales Teramoto et al. 2015 [monotypic]
                     Family Arenicellaceaeᵀ Teramoto et al. 2015
                       Genus Arenicellaᵀ Romanenko et al. 2010
                         1 Arenicella chitinivorans Nedashkovskaya et al. 2013
                         2 Arenicella xantha Romanenko et al. 2010