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Anthropology5_Early_Human_Evolution - Anthro5 18:04...

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Anthro 5 18:04 Early Human Evolution (Chimp-human divergence) o A. Taxonomic position o B. Ecological context o C. timing o D. Derived Traits o E. Cast of characters (who’s who in the pliopleistocene) Cast of Characters We might usually think about “adaptive grades” o 1. Pre-Australopithecus forms (6-4mya) o 2. Australopithecines: Australopithecus  (4-2mya) Paranthropus  (2.5-1ma) o 3.  Homo  (2 ma-present) Early Human Evolution (Chimp/human divergence) o A. Taxonomic position? Most texts differentiate between nonhuman apes (“pongids”) and  human apes (“hominids”) o B. Ecological context During the Miocene (25-7mya) the earth’s climate cooled Polar ice caps and mountain glaciers formed. (Globe had been ice free  for many 10’s of millions of years prior) Cooling had multiple effects in Africa 1. Overall decrease in rainfall
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2. Rainfall became more seasonal
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Anthropology5_Early_Human_Evolution - Anthro5 18:04...

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