13_from_hominin_to_homo - How Humans Evolved Chapter 13:...

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How Humans Evolved Chapter 13: From Hominin to Homo 1
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Climate b The Pleistocene epoch started 1.8 mya and involved cooling . 2
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Figure 13-1 3
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Homo ergaster Origins b H . ergaster lived from around 1.8 to 0.6 mya in Africa. b May have coexisted with H. habilis in Kenya. 4
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Homo ergaster Morphology b Ancestral features include narrowing of braincase behind the eyes, receding forehead, no chin. b Derived features include shorter nose, less prognathic face, taller skull, smaller jaws and molars, occipital torus, large browridges; many of these traits are probably related to diet. 5
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Figure 13-2 6
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Homo ergaster Morphology b Anatomical suite of characteristics indicates H . ergaster was fully adapted for terrestrial life, without the adaptations for arboreal life seen in earlier hominins. b Less sexual dimorphism than in other hominins. 7
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Figure 13-3 8
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Figure 13-4 9
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Homo ergaster Morphology b No evidence that there was spoken language. b More rapid juvenile development than humans, but slower than earlier hominins. 10
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Figure 13-5 11
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Figure 13-6 12
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