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 Pseudomonadotaᵀ Garrity et al. 2021
                 Class Deltaproteobacteria Kuever et al. 2006
                   Order Polyangiales Waite et al. 2020
                     Family Polyangiaceaeᵀ Jahn 1924 (Approved Lists 1980)
                       Genus Polyangiumᵀ Link 1809 (Approved Lists 1980)
                         Polyangium fumosum Krzemieniewska and Krzemieniewski 1930 (Approved Lists 1980)