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
                       01 Genus Anatilimnocola Kallscheuer et al. 2022
                       02 Genus Aureliella Kallscheuer et al. 2021
                       03 Genus Blastopirellula Schlesner et al. 2004
                       04 Genus Bremerella Rensink et al. 2021
                       05 Genus Crateriforma Peeters et al. 2021
                       06 Genus Lignipirellula Peeters et al. 2021
                       07 Genus Mariniblastus Lage et al. 2017
                       08 Genus Novipirellula Kallscheuer et al. 2021
                       09 Genus Pirellulaᵀ Schlesner and Hirsch 1987 [monotypic]
                       10 Genus Rhodopirellula Schlesner et al. 2004 [monotypic]
                       11 Genus Roseiconus Kumar et al. 2025
                       12 Genus Roseimaritima Bondoso et al. 2016
                       13 Genus Rosistilla Waqqas et al. 2021
                       14 Genus Rubripirellula Bondoso et al. 2016
                       15 Genus Stieleria Kallscheuer et al. 2021
                       16 Genus "Candidatus Laterigemmans" Kumar et al. 2022