APY107 - Early Hominids

APY107 - Early Hominids - Early Hominids Late Miocene (5-8...

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Unformatted text preview: Early Hominids Late Miocene (5-8 mya) About this time the world began to cool, grassland and savanna habitats spread, and forests began to recede. LCA of humans, chimps and bonobos between 5 and 8 mya. In the Late Miocene/Pliocene record of Africa, beginning about 5-6 mya, there appears a very unusual ape ----one that walked on two legs, rather than four. East African Great Rift Valley Hominids first appear in East Africa (6 mya) and South Africa later (3 mya) Sahelanthropus tchadensis (Toumai) 6-7 mya Discovered in 2001 in Chad, central Africa- Hominid or last common ancestor? Facial features and canine teeth hominid- like. Derived traits: smaller canines lack of C/P3 honing complex bipedal (foramen magnum toward front) flatter face Primitive traits: brain size 350 cc Orrorin tugenensis (Millennium Man) Tugen Hills, Kenya 6 mya Teeth smaller and body size larger than Lucy. Bipedal but with curved fingers. Ardipithecus kadabba (5.8 mya) Ardipithecus ramidus (4.4 mya) Aramis, Ethiopia currently the oldest known (undisputed) Ardi female height 47 weight 50 kg little dimorphism Primitive features: small teeth thin enamel small brain size curved phalanges opposable toe palmigrade locomotion similar to tchadensis skull (smaller) Derived features:...
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APY107 - Early Hominids - Early Hominids Late Miocene (5-8...

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