Evolution: Humans: Origins of Humankind
Australopithecus anamensis (4.2 to 3.9 million years ago)
Species Description:
Australopithecus anamensis possesses a mix of advancedand primitive traits. A partial tibia (the larger of the two lower leg bones)suggests that A. anamensis probably walked upright. The teeth of A.anamensis were covered with a layer of enamel much thicker than that of Ar. ramidus, suggesting a diet of hard-to-chew foods. The thickenedenamel is also a trait characteristic of all later hominids. In size and shape,however, the teeth of A. anamensis were primitive relative to laterhominids. A. anamensis probably lived in open woodland habitats in whatis now northern Kenya and southern Ethiopia.
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