Red algal tree of life with current taxonomic classification. The tree was reconstructed using Bayesian phylogenetic inference of DNA data mined from GenBank (Figure 1). Branch colors indicate statistical support of the clades: whereas black branches are strongly supported, the orange parts of the tree are poorly resolved. Intermediate colors represent intermediate support (see gradient legend). Five poorly supported regions are indicated with gray boxes (A-E). Numbers at nodes indicate branch support given as bootstrap values from maximum likelihood analysis before the vertical bar and Bayesian posterior probabilities after the vertical bar. Values are only shown if they exceed 50 and 0.95, respectively.