4-10-09 - 4/10/09 The "Dental Apes" cont. The...

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4/10/09 The “Dental Apes” cont. The Emergence of Hominids Apes (hylobatidae) – Y5 pattern of molars o Y – pattern between cusps o 5 cusps Dryopithecus o 8-12 mya o Miocene “dental ape” from Europe o Y-5 pattern distinguishes “dental apes” The Tertiary Period of the Cenozoic o 1.8 mya – Pliocene Epoch Origins of Hominidae o 5 mya – Miocene Epoch o 24 mya- Oligocene Epoch o 34 mya – Eocene Epoch o 55mya – Paleocene Epoch The Miocene-Pliocene Transition o Africa in the late Miocene Cooling and drying Shrinking of central African rainforest Emergence of forest – woodland – savanna mosaic Loss of arboreal niches Creation of terrestrial niches Tow responses:
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Some hominoids remain in shrinking forest habitat Trends in Hominid Evolution o Adaptation to terrestrial environment o Decreasing robusticity o Reduction in tooth size, especially CP 3 complex o Increase in absolute brain size
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4-10-09 - 4/10/09 The "Dental Apes" cont. The...

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