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This article has recently passed a GA review with very few questions asked. I've had a look through it and have removed some extremely flaky sources - we obviously can't use Rhymezone (a list of Wikipedia articles that mention a topic, apparently) as a reliable source, and we shouldn't be relying on discussion forums either on a serious topic. I'm not sure why we're citing EB, certainly no better than Wikipedia, instead of going to reliable review papers of which there are many in taxonomy. I've marked up some of the most glaring cases and added some citation needed tags; no doubt more could be done in that direction.
On the more technical question of whether the use of primary sources is appropriate I will not venture an opinion: if we are simply stating that Woese introduced a new idea in 1990 or whatever, that is essentially fine; further, if we use the summary sections of such papers for basic background information, that's fine too. What would not be ok would be to use Wikipedia's voice to say Woese was correct and to cite that to his paper. I have not noticed any such usage here but a far more careful look would be required to answer that question. Chiswick Chap (talk) 07:43, 27 April 2017 (UTC)
Given that this article has Biological classification as a redirect, it should really deal with some of the practical issues, the most basic of which is "How do I know which family, order, class, etc. an organism belongs to?" It needs more on how classification is a subjective issue, but that consensus can build up around a particular system. Peter coxhead (talk) 07:31, 16 January 2018 (UTC)