Early Hominins Australopithecus

Early Hominins Australopithecus - Early Hominins...

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Sahelanthropus tchadensis Found in chad, 7-6 mya, North Africa Relative dating Cranium (distorted), 5 pieces of jaw, some teeth, no postcrania Derived traits: (more like humans) Foramen Magnum anteriorly placed, small canines, non-prognathic face Primitive traits: (more like australopithecines) Large and continuous brow ridge, small brain, U-shaped dentition Who was the first hominin? 6 mya Absolute dating Proximal femur, midshaft humerus, some teeth, no cranium Argued to be biped, but upper canine is primitive Who was Orroin Tugenesis? (millennium man) Most complete skeleton but badly crushed Authors claim: Bipedal, small brain (300 cc) Others suggest: No clear indications of bipedalism Ardipithecus ramidus/kadabba: 6 - 4.4 mya Involves moving down from trees, shifting to bipedalism Moving out of forest into woodlands and grasslands, suggesting change in diet due to changes in food availability Retain many ape characteristics however How did the transition from apes to hominins occurs? Australopithecines and kin East Africa (Kenya and Ethiopia), earliest Australopithecus, earliest biped, large molars and small
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This note was uploaded on 05/20/2010 for the course ANP 120 taught by Professor Koenig during the Spring '07 term at SUNY Stony Brook.

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Early Hominins Australopithecus - Early Hominins...

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