Nature 308, 501 - 505 (05 April 1984); doi:10.1038/308501a0

The evolutionary relationships of man and orang-utans

Jeffrey H. Schwartz

Department of Anthropology, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA

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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