2 Origins of Hominids Most crucial change was Bipedal Locomotion Other changes includeExpansion of the brain, larger birth canal, reduction of face, teeth and jawsAll of these occurred 2 million yrs. After bipedalismJournal Entry 1
3 Why did Bipedalism occur? See fartherCarry foodCarry tools and weapons
4 Australopithecines First definite Hominids Genus of Hominids until C. 2 Mill yrs. AgoSomewhere b/t 3 and 4 mill. yrs ago.At Laetoli footprints found proving bipedal locomotionAlthough Bipedal, still may have spent time in trees for sleep and shelter
5 Types of Species Australopithecus afarensis Australopithecus africanus Australopithecus robustusThere are more Think of hominids as a Bush, not a timeline!
6 Australopithecus Afarensis Debate as to whether diff. species or notFootprints found to prove bipedalismBetween 3 and 4 million years ago
7 Australopithecus Africanus Jaw of apeTeeth of humansS-shape spine similar to man
8 Afarensis vs. Africanus Features of skull, teeth, and jaws that are less apelike in africanusSome debate different species
9 Australopithecus robustus 2-1 million years agoLarger molars and premolarsSmaller caninesWell-developed cranial crests and ridgesMuch heavierTaller: ft. tall
10 Ancestor?Australopithecus robustus is not thought to be an ancestor to the Homo speciesLived during same relative time as Homo species
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