Diversity of deep-branching planctomycetes. A maximum likelihood 16S rDNA tree kindly provided by Markus Schmid and Michael Wagner of the TU Munich (Germany) is shown. The tree was calculated with 16S rDNA sequences longer than 1400 nucleotides. Subsequently, shorter 16S rDNA sequences were added using the ARB parsimony method without changing the overall tree topology. Triangles indicate phylogenetic groups. Environmental clones obtained from wastewater treatment plants and Anammox-enrichments are labeled in bold and underlined, respectively. Bar represents 10% estimated sequence divergence.