Brief communication: Early hominin variability in first molar dental trait frequencies
Article first published online: 18 JUL 2005
Copyright © 2005 Wiley-Liss, Inc.
American Journal of Physical Anthropology
Volume 128, Issue 2, pages 477–484, October 2005
How to Cite
Guatelli-Steinberg, D. and Irish, J. D. (2005), Brief communication: Early hominin variability in first molar dental trait frequencies. Am. J. Phys. Anthropol., 128: 477–484. doi: 10.1002/ajpa.20194
- Issue published online: 23 SEP 2005
- Article first published online: 18 JUL 2005
- Manuscript Accepted: 13 SEP 2004
- Manuscript Received: 26 JAN 2004
- L.S.B. Leakey Foundation
- Ohio State University
- dental morphology;
This report documents greater variability in early hominin first molar dental trait frequencies than previous research indicated. Specifically, frequencies of several M1 dental traits that previously appeared to uniquely characterize Paranthropus are shown here to resemble those of the A. afarensis sample from Hadar. Like Paranthropus, A. afarensis from Hadar has a high frequency of cusp 6 and a low frequency of the protostylid. Paranthropus and A. afarensis are also not statistically significantly different in their frequencies of LM1 cusp 7, although this cusp is actually absent in the latter. Both groups differ significantly from A. africanus in their frequencies of these traits. Based on the developmental biology of molar cusp patterns, we suggest that the morphological similarities between Paranthropus and the Hadar sample may be homoplasies. Am J Phys Anthropol, 2005. © 2005 Wiley-Liss, Inc.