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Hominid Evolution.

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Presentation on theme: "Hominid Evolution."— Presentation transcript:

1 Hominid Evolution

2 Origins of Hominids Most crucial change was Bipedal Locomotion
Other changes include Expansion of the brain, larger birth canal, reduction of face, teeth and jaws All of these occurred 2 million yrs. After bipedalism Journal Entry 1

3 Why did Bipedalism occur?
See farther Carry food Carry tools and weapons

4 Australopithecines First definite Hominids
Genus of Hominids until C. 2 Mill yrs. Ago Somewhere b/t 3 and 4 mill. yrs ago. At Laetoli footprints found proving bipedal locomotion Although Bipedal, still may have spent time in trees for sleep and shelter

5 Types of Species Australopithecus afarensis Australopithecus africanus
Australopithecus robustus There are more  Think of hominids as a Bush, not a timeline!

6 Australopithecus Afarensis
Debate as to whether diff. species or not Footprints found to prove bipedalism Between 3 and 4 million years ago

7 Australopithecus Africanus
Jaw of ape Teeth of humans S-shape spine similar to man

8 Afarensis vs. Africanus
Features of skull, teeth, and jaws that are less apelike in africanus Some debate different species

9 Australopithecus robustus
2-1 million years ago Larger molars and premolars Smaller canines Well-developed cranial crests and ridges Much heavier Taller: ft. tall

10 Ancestor? Australopithecus robustus is not thought to be an ancestor to the Homo species Lived during same relative time as Homo species


12 Changes Expansion of brain Reduction of face, teeth, and jaws
Babies born less mature at birth Journal Entry #2

13 Expansion of the brain Had relatively small cranial capacities
Reason? Why would brain size have increased? (Think Evolution types) Possible reasons: Increased as a result of tool making

14 Reduction of Face, Teeth, and Jaws
Lower face not as protruding Reduction in size of Face Cheek bone Jaw

15 Now on to species of Homo
Different ideas on how Homo genus evolved Some say from Africanus Some say from Afarensis About 2 millions years ago

16 Homo habilis Larger brain absolutely and relatively than Australopithecus Found in East Africa Slightly Larger and more developed brain Stone tools?

17 Homo erectus 1.6 to 1.3 millions years ago
Skull generally long, low, and thickly walled Flat frontal face Prominent brow ridges Relatively small teeth modern arrangement

18 Cont… Fully developed vision area of brain
Larger areas of speech, sensory, memory and motor areas of brain Neck down, almost same as Homo sapiens

19 Fire Fire first appears 1.5 mill. Years ago
Only able to spread out after development of fire Journal Entry

20 Stone tools Acheulean “hand axe”
1.5 mil. Years ago Used for butchering, digging, pounding Toolmaker first shaped the core, and prepared a striking platform at one end Knock off flakes

21 Hunting Homo erectus began to hunt medium sized animals
Spears, stone throwing, and fire Needed to plan and work in groups



24 Neanderthal Becoming Human

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