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Ardipithecus ramidus (5.6-4.4mya)
- Found in Aramis, Ethiopia
- less projecting and more "incisoform" canines. a
derived
trait found in Ardipithecus and in later hominoids
- Ardipithecus was found in a forested region negating the savana theory
Anatomical changes with bipedalism
1. curved spinal column
2. differently shaped pelvis
3. thigh bone (femur) angles inward
4. bigger knee joints
5. non-grasping big toe
Australopithecus afarensis (Pliocene)
Found in Laetoli, Tanzania (E. Africa)
Was bipedal
:
- angled femur
- knee surface flattened and broadened for stability
- pelvic blade shortened
- big toe convergent
..still not human w/short legs, long arms and curved fingers
the teeth of A. afarensis are "intermediate" between ape and human:
1. A. afarensis canine shows wear on the sides and on the tip (human/ape)
2. First lower premolar was "intermediate" between a
uni
cuspid chimp, and a
bi
cuspid human
3. The diastema is still present in A.afarensis but "intermediate" between human/ape
4. Dental arcade is ape
A. afarensis skull...
shows
ancestral
traits such as:
- strong prongnathism
- sagittal crest
Author
trainingliz89
ID
120458
Card Set
ANT 001
Description
Lecture 15
Updated
2011-12-03T20:55:08Z
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