The whole paragraph has been rewritten as: “The nanosized archaean symbiont Nanoarchaeum equitans has a highly reduced genome (490,885 bp [44]). We note that the monophyly of Euryarchaeota was also violated by Nanoarchaeum in some 16S rRNA trees, see, e.g., Figure 4 in a 2009 paper [61] as well as (c) and (d) in our Figure 4. In fact, we have suggested skipping such tiny genomes when studying bacterial phylogeny, see, e.g., [29] and a note in the home page of the CVTree Web Server [21]. In the present case we may at most say that Nanoarchaeota probably makes a separate phylum, but its cutting into Euryarchaeota might be a side effect due to the tiny size of the highly reduced genome.”
L239–244: hard to read, please rephrase.