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Lecture 38

ANTH 1210 Lecture 38: Lecture 38

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ANTH 1210
Haskel J.Greenfield

oS82 Greek: ceno = recent zoic = life aleocene: 6553 MYA Plate tectonics single land mass (Europe, Africa, Asia and South America) North America is separate First major mammal radiation First possible primitive primates plesiadapoids Earliest evidence for primate evolution North America Beginning Preprimate Toward end earliest appearance of Prosimians 55 MYA Preprimate form Eocene: 5335 MYA Warm tropical climates widespread Appear modern orders of mammals Prosimian primates common and widespread Types: lemurs and tarsiiformes First true prosimians Notharctus and Necrolemur Nocturnal Tarsierlike and large orbits Claws disappear Teeth less specialized Nose is reduced Orbits: face forward and rely on vision more, partially isolated from chewing muscles by postorbital ridge Flatter face Emphasis on molars Smilodectes Limbs: powerful limber and leaper, long hind limbs, long grasping digits with nails Primate first appear in the Eocene era Beginning prosimians flourish End Anthropoidea (possible first appearance) Oligocene: 3523 MYA Cooler and drier in North Primates go extinct in North America South American Monkeys: Colonization of new world
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