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 Planctomycetota Garrity and Holt 2021
                 Class Planctomycetiaᵀ Ward 2020
                   Order Pirellulales Dedysh et al. 2020
                     Family Pirellulaceaeᵀ Dedysh et al. 2020
                       Genus Pirellulaᵀ Schlesner and Hirsch 1987 [monotypic]
                         1 Pirellula staleyi (Schlesner and Hirsch 1984) Schlesner and Hirsch 1987