Procaryotic Genera Domain "Bacteria" Woese et al. 1990 Phylum Planctomycetes Garrity and Holt 2001 [monotypic] Class "Planctomycetacia" [monotypic] Order Planctomycetales Schlesner and Stackebrandt 1987 [monotypic] Family Planctomycetaceae Schlesner and Stackebrandt 1987 1 Genus Planctomyces Gimesi 1924 (Approved Lists 1980) 2 Genus Gemmata Franzmann and Skerman 1985 3 Genus Isosphaera Giovannoni et al. 1995 4 Genus Pirellula Schlesner and Hirsch 1987