↑Carl R. Woese, Otto Kandler, Mark L. Wheelis, 1990: "Towards a natural system of organisms: proposal for the domains Archaea, Bacteria, and Eucarya". Proceedings of the National Academy of Sciences of the United States of America, 87(12):4576-9. doi:10.1073/pnas.87.12.4576
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If you wish to credit the illustration, please credit: Peter Halasz.
I have now released these "Biological classification" images into the public domain. Prior to 2012 they were released under Creative Commons licenses (Attribution-Share Alike 2.5 Generic and Creative Commons Attribution-Share Alike 3.0 Unported).
Captions
Poster showing different biological classifications