Abstract
Man shares uniquely few morphological features with either the chimpanzee or the gorilla, whereas there are many features that suggest affinities between man and the orang-utan, to whom the fossil Sivapithecus appears to be closely related. If these are unique features, inclusion of Sivapithecus, man and the orang-utan in a single clade, distinct from that containing the African apes, is justified but contrary to current opinion.
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Schwartz, J. The evolutionary relationships of man and orang-utans. Nature 308, 501–505 (1984). https://doi.org/10.1038/308501a0
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DOI: https://doi.org/10.1038/308501a0
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