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Thick enamel for nut cracking
How can you tell what a specimen ate?
Stable Isotope studies of dental enamel
E. Lloyd Du Brul studied?
Homo habilis characteristics?
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
forelimbs indicate climbing
Oldowan Chopper Technology ?
Hammerstones, cores and flakes
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)
Large flat face
sexual dimorphism within-species variation keeps SSH intact
between-species variation species diversification adaptive radiation in Homo