ANTH 203 Lecture Notes - Lecture 17: Paranthropus, Homo Habilis, Homo Rudolfensis
3 Jun 2012
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Document Summary
There are theoretically, between 9 and 30 hominin species are expected in the 4. 5 million years from 6. 5-2 mya. Large mammal species have a time duration between 300,000 to 1 million years. Retained part of primitive ape-like dental pattern which included. Wide, sharp incisors for cutting, and premolars with two strong pointed cusps design to break things. Evidence of a wider variety of dietary items than the robust. Unusual posture of a. africanus suggest that bipedalism may have evolved later in south africa. Lumpers see earlier branching, but less branching within the lineages. The species, key to answering these questions, are australopithecus afarensis and africanus. Lacked physiological mechanisms to cool the brain (way less capillaries than modern humans) Requires more activity in the morning and late evening: peak period of. But p. was better adapted and survived much longer. May have evolved from a. africanus and spread north. Poorly dated specimens and we can"t be certain.
