18.txt

Australopith's teeth?

Thick enamel for nut cracking
How can you tell what a specimen ate?
- Stable Isotope studies of dental enamel
- E. Lloyd Du Brul studied?
- teeth
Homo habilis characteristics?
- 2.0-1.6Ma
- Handy Man
- Tool association
- Passes cerebral rubicon
Kenyanthropus platyops characteristics?
- flat-faced man of Kenya
- 3.2 to 3.5 Ma
- West Lake Turkana
- contemporary with Lucy KNM-WT 40000 = holotype
Homo habilis characteristics relative to Australopiths?
- unreduced incisors & canines
- small (narrow) molars
- no sagittal crests
- slight postorbital constriction
- derived palatal shape
Defining Homo habilis Postcranial Remains?
- robust hand bones
- adducted big toe
- stiff midfoot
- forelimbs indicate climbing
Oldowan Chopper Technology ?
- Hammerstones, cores and flakes
- First appearances
- East Africa South Africa Mideast, Asia Europe
- 2.5 Ma 2.0 Ma 1.8 Ma 0.8 Ma
Single Species Hypothesis?
- C. Loring Brace & Milford Wolpoff (University of Michigan)
- 1968 and multiple incarnations since
- Differences between hominin species reflect Intraspecific variation Only one species of hominin can exist at any one time.
Specimen that ruined the Single Species Hypothesis?
- New data that
- KNM-ER 1470 (found 1973)
- H. rudolfensis
- Large flat face
- Big brain
- Big molars
- 1.9Ma
- Lumpers?
- sexual dimorphism within-species variation keeps SSH intact
Splitters?

between-species variation species diversification adaptive radiation in Homo

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18.txt

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4/20/2014, 10:29:55 PM

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