Round 1: and Author Response Summary Zuo et al.
The placement of Halobacteria (due to interfering Nanoarchaeota, I presume) is also a little disturbing. I would recommend that the authors provide a discussion of this. Especially with regards to other archaeal trees. For instance, in the tree of Armanet et al 2011 that the authors also refer to, the placement of Halobacteria with respect to Nanoarchaeota is very different.