A robust phylogenetic tree comes with a fixed branching order of leaves. One looks at the leaf names and their taxonomic lineage and tries to map the latter to the branches. To this end we added the following paragraphs in the “Material and Method” section. “There are two aspects of a phylogenetic tree: the branching order (topology) and the branch lengths. Branching order is related to classification and branch length to evolution time. Calibration of branch lengths is always associated with the assumption that mutation rate remains more or less a constant across all species represented in a tree, an assumption that cannot hold true in a large-scale phylogenetic study like the present one. Therefore, branching order in trees is of primary concern, whereas calibration of branch lengths makes less sense. Accordingly, all figures in this paper only show the branching scheme without indication of branch lengths and bootstrap values.” “Branching order in a tree by itself does not bring about taxonomic ranks, e,g, class or order.
However, I am personally not convinced that whole genomes bring additional advantages, or if we are better off by just using a conserved set of proteins.