oldowan - Lecture notesParanthropus, Early Homo and the...

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Lecture notes— Paranthropus , Early Homo and the Oldowan 11/25/09 Climatic change decreased rainfall and increased rainfall seasonality Changes would have changed types and seasonal availability of foods for hominids Global climate change causes changes in hominid evolution: Gracile australopithecines become extinct. Two new forms of hominid appear: Paranthropus Early Homo Robust Australopithecines Not an Australopithecus Genus: Paranthropus They are called robust australopithecines because they show many of the same adaptations for eating hard foods as gracile australopiths. Paranthropus takes these adaptations to the extreme. P. Boisei (East Africa) P. Robustus (South Africa) Huge premolars and Molars/Tiny incisors Large, deep mandible Flat face, broad cheek bones Sagittal crest Seasonal variation in diet? Still many primitive (ape-like) characteristics Brains still small (410-520 cc.) Body size and degree of sexual dimorphism similar to gracile australopiths Teeth and jaws are robust, not their bodies!!! Robust australopithecines:
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oldowan - Lecture notesParanthropus, Early Homo and the...

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