HIDDEN THIRD WORLD. “Woese and Fox, in perhaps the most important biodiversity discovery of the past 100 years, used what were then cutting edge molecular tools to disprove the existing notion that the biosphere could be divided dichotomously into eukaryotes and prokaryotes. Instead, hidden among the prokaryotes they found another group—the Archaea—that was as different from the bacteria as either were from the eukaryotes.”
https://standardsingenomics.biomedcentral.com/articles/10.1186/s40793-016-0180-8