Re: Earliest Hominids

Alex Duncan (
29 Jun 1995 12:54:41 GMT

In article <3sp58o$> HARRY R. ERWIN, writes:
>I thought this, too, until I saw Holloway, Early Hominid Endocasts, in
>Tuttle, where he used a figure of 20 kg for A. africanus. His arguments
>make sense, too. It's a question of how much flesh you put on those bones,
>and 28-30 kg corresponds to a moderate degree of robustness, while 20 kg

I'm unfamiliar w/ this particular Holloway reference. More details?

Estimating body weight is problematic. I find it encouraging, however,
that regression equations using EITHER human or ape (or combination)
derivations for either articular surface dimensions or diaphyseal
dimensions seem to agree on around 28 - 30 kg for AL 288, and for Sts 14.

I agree that as we go back further, we might expect to see hominids
getting smaller and smaller. I suspect A. ramidus will turn out to be
smaller than the other Australopithecines, and that our common ancestor
w/ chimps may have weighed 10 - 15 kg.

Alex Duncan
Dept. of Anthropology
University of Texas at Austin
Austin, TX 78712-1086