Lec 14

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Author:
trainingliz89
ID:
114153
Filename:
Lec 14
Updated:
2011-11-02 23:50:22
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Ant 001
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Description:
Primate Origins
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  1. The Cenozoic Era (65mya-now)
    • - Paleocene epoch began 65 mya
    • - Eocene epoch began 54 mya
    • - Oligocene epoch began 34 mya
    • - Miocene epoch began 23 mya

    • - Pliocene epoch began 5 mya
    • - Pleistocene epoch began 2 mya

    - Holocene epoch began 12,000 ya
  2. Paleocene epoch (65 mya):
    primate like
    • Plesiadapiformes (plesiadapids)
    • - small primate like animals from the late paleocene once thought to be primates.
    • - but they only share ancestral traits w/primates.
    • - no post orbital bar.
    • ..technically not primates
  3. Eocene epoch (54 mya)
    first true primates
    • - The Eocene was the Age of the Primates
    • - impressie adaptive radiation of primates
    • - related to the emergence of flowering plants(angiosperms) and insects
    • - Pleisiadapids, Adapids, Omomyids
    • (not primates) (lemur/loris) (tarsier-like)
  4. Oligocene epoch (54 mya)
    the earliest anthropoids
  5. Continental drift and the South American primate problem
    • Maybe they came from N. America?
    • -No anthropoid fossils found in N. America
    • -Morphological data suggest that S. American primates came from Africa
    • -S. America and Africa were seperated by 2000mi
    • -Vegetation rafts from mangroves?
    • -Maybe anthropoid primates actually appeared in Africa much sooner than we think
    • -Africa and S.America would have been closer to each other further back in time(not so far to float)
    • -the oldest anthropoid fossil we have managed to find is probably not the oldest member of the anthropoid lineage
  6. Aegyptopithecus
    found in the Fayum by Elwyn Simons
    • Definition is clearly Anthropoid like:
    • - low rounded cusps
    • - 5 cusps on the lower molars (Y-5)
    • - 2 premolars (like all catarrhines)

    • BUT retains some ancestral traits:
    • - long snout
    • - small brain case
  7. Aegyptopithecus is...
    close to the root of all catarrhines
  8. Miocene epoch (23 mya)
    early hominoids
    • Proconsul
    • - some think Procunsul might be a direct ancestor of the African apes.
  9. Proconsul lacked...
    • -the brachiating complex of all living hominoids
    • -a tail
  10. Proconsul emerged...
    - somewehre near the root of modern Hominoids
  11. ASIAN LINEAGE: Sivapithecus (12-18mya)
    Probable ancestor of the orangutans
    • - narrow interotbits
    • - ovoid orbits
    • - no brow ridges
    • - no frontal sinus
  12. Gigantopithecus
    • another Asian ape is similar to an over-sized Sivapithecus
    • - it had enormous jaws and molars
  13. Hypothesis for the evolution of bipedalism
    • 1. efficient locomotion between dispersed food resources
    • 2. thermoregulation
    • 3. frees hands to carry useful items
    • 4. permits efficient harvest from small fruit trees

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