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 Pirellula Schlesner and Hirsch 1987