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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Primate and Hominin Origins
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…
*Go back to the chart on pg. 129
Millions of years ago right after the dinosaurs died…
More than 200 recognized fossil primate species.
Darwinius, from the Messel site in Germany, discovered in 2009 and dates to ~47 mya.
More than 200 recognized fossil species.
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.
“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.
Approximate position of the continents during the beginning of the Oligocene
Walking with the Beasts (BBC) “Whale Killer”
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
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.
African forms (23–14 mya)
European forms (16–11 mya)
Asian forms (16–7 mya)
Sivapithecus (from Turkey and Pakistan) shows facial features similar to the modern orangutan, suggesting a fairly close evolutionary link.