[organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Domain Bacteria Woese et al. 1990
     Phylum "Planctomycetes" Garrity and Holt 2001
       Class "Planctomycetacia"
         Order Planctomycetales Schlesner and Stackebrandt 1987
           Family Planctomycetaceae Schlesner and Stackebrandt 1987
             Genus Pirella Schlesner and Hirsch 1984, nom. illeg. see Genus Pirellula Schlesner and Hirsch 1987