to six million years ago:
ape/hominid line splits. At that point we have an ultraprimitive
ape-man. This first bipedal primate has slightly curved hands
and toes, relatively long arms and short legs, and,
compared to an ape, smaller canine teeth and thicker dental
4.5 million years ago:
We dont know a lot about Ardipithecus ramidus, because
the findings havent been published yet. But we do know it has
smaller canines and slightly thicker enamel.
4.1 million years ago:
We see Australopithecus anamensis, which Meave Leakey
discovered near Kenyas Lake Turkana. An anamensis knee
joint indicates the animal is walking upright. It has relatively
reduced canines and thicker enamel but a very small
brain and a very primitive, protruding jaw not unlike a chimpanzees.
at left by Kenneth Garrett