BIO_Lecture_Outline_4 - ANT 100Y Lecture#4 Outline...

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ANT 100Y Lecture #4 Outline Heterdontism 4 kinds of teeth in most adult primates Dental Formula (Human) . in modern humans Major Epochs Paleocene, Eocene, Oligocene, Miocene, Pliocene, & Pleistocene Paleocene World Map Paleocene World Climate Plesiadapiformes Size: tiny, shrew-sized to size of small dog. Solitary, nocturnal quadrupeds; well-developed sense of smell. Diet: insects and seeds. Used to be classified as primates. Recent: Plesiadapids NOT Primates 1) No postorbital bar, 2) Claws instead of nails, 3) Eyes placed on side of head, & 4) Enlarged incisors . How Primates Differ from Most Other Mammals Primates have more convergent orbits, petrosal bulla, postorbital bar or closure, & grasping extremities with nails rather than claws. So…. .When did Primates Evolve? Genetic studies: 1st primates evolved ~ 80-90 MYA. No “true” primates (Euprimates) found in Paleocene. But, primates are found in fossil deposits in Eocene. Thus, likely that primates evolved before Paleocene Adaptive Origins of Primates 1). Arboreal Theory 2). Visual Predation Theory 3). Angiosperm Co-Evolution Theory Eocene World Map Eocene Climate
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BIO_Lecture_Outline_4 - ANT 100Y Lecture#4 Outline...

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