Abstract
The postcranial sample ofA. afarensis can be divided into two size groups. Among the best preserved elements which are represented by both morphs are the distal femur, proximal ulna, and capitate. The difference between the large and small fossil femora is similar to the difference between average male and femaleG. gorilla andP. pygmaeus. The distal femora ofH. sapiens are less sexually dimorphic while those ofP. paniscus, P. troglodytes, andH. lar are not significantly dimorphic at all. Large and small capitates and proximal ulnae ofA. afarensis differ slightly more than the highly dimorphic species of extant Hominoidea. In my sample of Amerindians, the capitate and proximal ulna are also strongly dimorphic. The two species ofPan have insignificant sexual dimorphism in these traits.
There results imply that strong sexual dimorphism in body size is the primitive condition for the large bodied hominoids.
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References
Johanson D. C. &White T. D., 1979.A systematic assessment of early African hominids. Science, 203: 321–330.
Johanson D. C., White T. D. &Coppens Y., 1978.A new species of the genus Australopithecus (Primates: Hominidae) from the Pliocene of Eastern Africa. Kirtlandia 28: 1–14.
McHenry H. M., 1983.The capitate of Australopithecus afarensis and A. africanus. American Journal of Physical Anthropology 62: 187–198.
McHenry H. M. &Corruccini R. S., 1978.The femur in early human evolution American Journal of Physical Anthropology, 49: 473–488.
McHenry H. M. &Corruccini R. S., 1976.Analysis of an early hominid ulna from the Omo Basin, Ethiopia. American Journal of Physical Anthropology, 44: 295–304.
Simpson G. G., Roe A. &Lewontin R. C., 1960.Quantitative Zoology. Harcourt, Brace, and World, New York.
Wolpoff Milford H., 1976.Some aspects of the evolution of early hominid sexual dimorphism. Current Anthropology 17: 579–606.
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McHenry, H.M. Size variation in the postcranium ofAustralopithecus afarensis and extant species of hominoidea. Hum. Evol. 1, 149–155 (1986). https://doi.org/10.1007/BF02437491
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DOI: https://doi.org/10.1007/BF02437491