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 Fibrobacteres-Chlorobi-Bacteroidetes (FCB) Gupta 2004
               Phylum Fibrobacteres Garrity and Holt 2012
                 Class Fibrobacteriaᵀ Spain et al. 2012 [monotypic]
                   Order Fibrobacteralesᵀ Spain et al. 2012 [monotypic]
                     Family Fibrobacteraceaeᵀ Spain et al. 2012 [monotypic]
                       1 Genus Fibrobacterᵀ Montgomery et al. 1988