09 - 4/22/09 Part IV Lecture 5, cont some hypotheses...

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4/22/09 Part IV Lecture 5, cont – some hypotheses regarding evolutionary relationships among earliest hominids 2 mya – a consensus of sorts… but this is about as far as it goes! 3mya – Austrlopithecus afarensis Ardipithecus anamensis 4 mya – Ardipithecus ramidus 5 mya – Ardipithecus kadabba Part IV Lecture 6: Earliest evidence of Genus Homo Selection for increased intelligence: the second major trend in hominid evolution Trends in fossil record linked to increasing intelligence Changes associated with increase encephalization o Size of skull o Increasing complexity of brain anatomy o Changes in shape birth canal* Asdfajsd;lkfaj;sldkjfa o Olduvai Gorge o o Homo habilis o ~2 mya o “the handy man” o oldusan tools: hammerstones, crude flakes KNM –ER 1813 Richard Leakey Homo habilis 1.8 mya Why be intelligent?
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technological intelligence social intelligence ecological intelligent Evolutionary “trade-offs” a trait that enhances fitness in one dimension may increase
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09 - 4/22/09 Part IV Lecture 5, cont some hypotheses...

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