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Lecture 2

ANT100Y1 Lecture 2: ANT LEC 2


Department
Anthropology
Course Code
ANT100Y1
Professor
Shawn Lehman
Lecture
2

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LECTURE 2
Time Frame and Climate
- Major Epochs during Tertiary Period
Paleocene “Primates”
- Geography and climate
- Very different from present -- day conditions
- Hotter, more humid
Paleocene & Primate-like mammals: Plesiadapiformes
- Body Size: tiny, shrew size to size of small dog
- Niche: likely solitary, nocturnal quadrupeds; well0 developed sense of smell
- Diet: insects and seeds
- Used to be classified as primates because of primate like teeth and limbs that are
adapted for arboreal lifestyle
Recent: Plesiadapids not Primates
- No postorbital bar
- Claws instead of nails
- Eyes placed on side of head
- Enlarged incisors
More Recent
- Plesiadapids and others ARE Primates
- Share a moleclar node
Eocene Geography and Climate
- Hot, humid
Two Main Eocene Primate Families
- Adapidae
- Body size: 100g to 6.9 kg
- Diurnal and nocturnal forms
- Mainly arboreal quadrupeds, some were specialized leapers
- Smaller adapids ate mostly fruit and insects, larger forms ate more fruit and
leaves
- Led to lemurs?
- Omomyidae
- Body size of 45 to 2500 g
- Some nocturnal others diurnal
- Omomyids thought to been specialized leapers
- Teeth: adapted for eating insects and soft fruits, only fes species were leaf-eaters
- Led to tarsiers?
- Brains from Eocene Primates
Oligocene Geography and Climate
- Continents shifting
Oligocene Primates
- Three haplorhine features
- Fused frontal bones
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