ANT100Y1 Lecture 4: Primate and Human Evolution
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What a hominin is in terms of taxonomy. Morphological trends in hominin evolution o o o. General patterns of morphology and phylogenetics for fossil primates and. Paleocene and primate-like mammals: plesiadapiformes o o o o. Body size: tiny, shrew-sized to size of small dog. Niche: likely solitary, nocturnal quadrupeds; well-developed sense of smell. In the past: classified as primates because of primate-like teeth and limbs that are adapted for arboreal lifestyle. Recent: plesiadapids are not primates due to four reasons o o. Formation of ice caps in antarctica and north pole. Starts of hot, then continuous reduction in global temperatures o. Teeth: adapted for eating insects and soft fruits, only few species were leaf-eaters. Ocean levels dropping, land is exposed; mountainous regions. Volatile temperature: huge spike in temperature around 25 million years ago. Primates appear for first time in fossil record of south america towards o o. Miocene (early: 23-16; middle: 16-11. 6; late: 11. 6-5. 3 million years ago)
