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Chapter 8. Primate and Hominin Origins. Ancestor to Primates?. What is ancestral to all the critters under the Order Primates ? Where all the humans, australopithicines, monkeys, apes, homo habilis, tarsiers, lorises, aye-ayes, Neandertals, etc. came from…. Primates Review. Me too!.

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chapter 8

Chapter 8

Primate and Hominin Origins

ancestor to primates
Ancestor to Primates?

What is ancestral to all the critters under the Order Primates?

Where all the humans, australopithicines, monkeys, apes, homo habilis, tarsiers, lorises, aye-ayes, Neandertals, etc. came from…

primates review
Primates Review

Me too!

*Go back to the chart on pg. 129

the end of the cretaceous period 65 5 mya
The end of the Cretaceous period 65.5 mya

Millions of years ago right after the dinosaurs died…

eocene 55 35mya
Eocene 55-35mya

More than 200 recognized fossil primate species.

eocene 55 35 mya
Eocene 55-35 mya

Darwinius, from the Messel site in Germany, discovered in 2009 and dates to ~47 mya.

More than 200 recognized fossil species.

eocene primates
Eocene Primates

Foramen magnum position = whether the body is habitually horizontal (like a horse) or vertical (like a monkey). 

During the Eocene, the foramen magnum in some primate species was beginning to move from the back of the skull towards the center.

Suggesting…Holding their bodies erect while hopping and sitting, like modern lemurs, galagos, and tarsiers.

oligocene
Oligocene

“Rafting” Africa-> South America ~34 mya early in the Oligocene

By this early point in the Oligocene, continental drift had separated the New World from the Old World.

New and Old World monkeys branch off here, 35 million years ago.

oligocene1
Oligocene

Approximate position of the continents during the beginning of the Oligocene

oligocene primates from fayum
Oligocene Primates from Fayum

Walking with the Beasts (BBC) “Whale Killer”

  • Apidium
    • Primitive dental arrangement suggests near or before evolutionary divergence of Old and New World anthropoids
    • Small, squirrel-like fruit and seed eating, adept at leaping and springing
egypt s fayum
Egypt’s Fayum

Today, it’s a ~550 square mile lush “oasis” basin in the desert south of Cairo

During the Eocene and Oligocene, the Faiyum was forrested

At the beginning of the Miocene, the Faiyum had become a dry hollow

oligocene primates from fayum cont
Oligocene Primates from Fayum cont.
  • Aegyptopithecus (genus)
    • 35-33 mya
    • Largest of Fayum anthropoids, roughly the size of a modern howler monkey (13-18 lbs)
    • Short-limbed, slow-moving
miocene hominoid fossils
Miocene Hominoid Fossils

These hominoids are more closely related to the ape-human lineage than Old World monkeys.

Mostly large-bodied hominoids, more akin to the lineages of orangutans, gorillas, chimpanzees, and humans.

Most of the Miocene forms discovered are so derived that they are probably not ancestral to any living form.

miocene fossil hominoids
Miocene Fossil Hominoids

African forms (23–14 mya)

  • Especially from western Kenya, these hominoids are, in many ways, primitive.
  • Proconsul
miocene fossil hominoids1
Miocene Fossil Hominoids

European forms (16–11 mya)

  • From scattered localities in France, Spain, Italy, Greece, Austria, Germany, and Hungary, most are quite derived.
  • Dryopithecusand Ouranopithecus
miocene fossil hominoids2
Miocene Fossil Hominoids

Asian forms (16–7 mya)

  • The largest and most varied group from Turkey through India/Pakistan and east to southern China, most are highly derived.
  • Sivapithecus
sivapithicus
Sivapithicus
  • Note the dished face, broad cheekbones, and projecting upper jaw and incisors on both Sivapithecus (left) and the Orangutan (right)

Sivapithecus (from Turkey and Pakistan) shows facial features similar to the modern orangutan, suggesting a fairly close evolutionary link.