Anthropology5_Cast_of_Characters - Anthro5 18:04...

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Anthro 5 18:04 Cast of Characters 1. What was their ecology? 2. Were the same selection pressures operating over the entire 7 million year  period? 3. Might the various hominin species have been subject to different selection  pressures? We might usefully think about “adaptive grades” 1. Pre Australopithecus forms 2. Australopithecines: a. Australopithecus b. Paranthropus 3. Homo Sahelanthropus 6.0 mya to 7.0; Chad. Skull Deformed Flat face and hevy brow ridges, characterist of much later hominins. Bipedal?  Central foramen magnum. Nuchal region (back of skill) apelike. Small brain (320  to 350cc)  U-shaped dental arcade; apelike teeth.  Somewhat reduced canines.  Intermediate enamel thickness. Light forest near a lakeshore Orrorin tugenensis. 6.0 mya; Kenya Femur (thigh bone) suggests bipedality
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Thick molar enamel. Chimp-like incisors, canines, and premolars Arm and finger bones suggest climbing Associated fossils include forest-living savanna-dwelling forms.  Ardipthecus ramidus Ardipithecus kadabba Ethiopia. 5.8-4.4mya Bipedal? Anterior foramen magnum, extensive post-cranial remains Smaller canines than non-homin apes; lacks CP3 complex. Intermediate molar enamel Relatively small molars. Forest Environment Australopithecus spp. 4.2 to 1.0 mya: much of E. and S. Africa
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This note was uploaded on 08/25/2011 for the course ANTH 5 taught by Professor Gaulin during the Fall '07 term at UCSB.

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Anthropology5_Cast_of_Characters - Anthro5 18:04...

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