Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
           Domain Bacteria Woese et al. 2024
             Kingdom Pseudomonadati (Gibbons and Murray 1978) Oren and Göker 2024
               Phylum Fibrobacterota Garrity and Holt 2021
                 Class Fibrobacteriaᵀ Spain et al. 2012
                   1 Order Fibrobacteralesᵀ Spain et al. 2012 [monotypic]
                   2 Order "Candidatus Fibrimonadales" corrig. Abdul Rahman et al. 2022 [monotypic]