BILD 3 Lecture Notes - Lecture 19: Homo Habilis, Homo Erectus, Bipedalism
26 Dec 2018
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Document Summary
Evolution of hominin traits: small -> large brain, walking: quadrupedal -> bipedal, teeth: canine big -> small, arboreal: reduced over time. Species not in the homo genus: australopithecus afarensis (lucy and selam, lucy: 3. 2 million years old, much more human-looking compared to ardi, big toe is lined up like in humans. No longer apposable, so better for bipedalism, worse for climbing: fossilized foot bone of other organism showed feet planted on the ground, not turned for climbing. Metatarsals rotated for feet to be flat on ground: bottom half bipedal, top half arboreal, selam: 3 years old, 3. 3 million years ago, found shoulder blade: shows how species move, ape-like upper bodies (climbing/arboreal). Still had bigger range of motion in shoulders: human-like lower bodies (bipedal, shows transition when we abandoned tree-climbing, but still these species were more tree-climbing than initially thought. Homo species: homo habilis, 2. 4-14 mya.
