11_from_hominoid_to_hominin

11_from_hominoid_to_hominin - How Humans Evolved 5e Chapter...

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How Humans Evolved, 5e Chapter 11: From Hominoid to Hominin 1
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First Hominins b Six million years ago, climate and geographic change led to the evolution of hominins. Homininae = clade containing gorillas, chimps, humans Hominina = clade containing humans, our relatives 2
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First Hominins b Characteristics of humans include: s Bipedalism s Differences in dental anatomy from apes s Large brains relative to body size s Long period of juvenile development s Dependence on a material and symbolic culture b Hominins shared some of the features of humans and contemporary chimpanzees. 3
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4
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Chimp-Human Split b Between 7 to 5 mya, the common ancestor of chimps and humans roamed the earth. b Sahelanthropus tchadensis , discovered in 2002, is the earliest known hominin, living around 7 to 6 mya. It has both derived and primitive features. ancestral traits. 5
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Figure 11-3 6
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Chimp-Human Split b Orrorin tugenensis , discovered in 2001, is also similar to both chimps and humans. 7
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Figure 11-2 8
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Chimp-Human Split b Ardipithecus includes two species, A . ramidus and A . kadabba , that each have similarities to chimps and humans. 9
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Figure 11-1 10
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Other Non Homo Hominin Genera and Species b Australopithecus s anamensis, afarensis , africanus, garhi s habilis , rudolfensis b Paranthropus s aethiopicus , robustus , boisei b Kenyyanthropus s platyops 11
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