Abstract
Yeast systematics has wholeheartedly embraced the phylogenetic approach. Central to this has been the unspoken convention that taxa at all ranks be strictly monophyletic. This can result in a proliferation of small genera and instances of nomenclatural instability, counter to the expected benefit of phylogenetic systematics. But the literature abounds with examples, at all taxonomic levels, where paraphyly is a reality that can no longer be ignored. The very concepts of Bacteria or Archaea, under the constraint of monophyly, are in peril. It is therefore desirable to effect a shift in practices that will recognize the existence of paraphyletic taxa.
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More From: International journal of systematic and evolutionary microbiology
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