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 Planctomycetes-Verrucomicrobia-Chlamydiae (PVC) Wagner and Horn 2006
               Phylum "Planctomycetes" Garrity and Holt 2001
                 Class "Planctomycetacia"ᵀ [monotypic]
                   Order Planctomycetalesᵀ Schlesner and Stackebrandt 1987 [monotypic]
                     Family Planctomycetaceaeᵀ Schlesner and Stackebrandt 1987
                       Genus Pirellula Schlesner and Hirsch 1987 [monotypic]
                         Pirellula staleyi (Schlesner and Hirsch 1984) Schlesner and Hirsch 1987