Lehman_lecture4 - 09.10.19 Lecture 4 Primate Evolution...

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Unformatted text preview: 09.10.19 Lecture 4 Primate Evolution Goals - General patterns of morphology for fossil primates- What a hominin is in terms of taxonomy- Morphological trends in hominin evolution : bipedalism / expansion in brain size/ change in dental,cranial features Time frame and Climate Major epochs during tertiary period : Paleocene ~ eocene~ oligocene~miocene Paleocene “ Primates”- Geograpy and climate very diff. from present-day - Hotter, more humid - Maybe entire world covered in temperate forests Paleocene & primate-like mammals : Plesiadapiformes- Body size : tiny, shrew-sized to size of small dog- Niche : likely solitary, nocturnal quadrupeds; well developed sense of smell- Diet : insects (small, compact source of food) 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!! : 1. no postorbital bar (9¡¡¡), 2. Claws (¡¡ ¡¡¡ – primitive ) instead of nails, 3. Eyes placed on side of head 4. Enlarged incisors ** using phonetics (?) //- More Recent : Plesiadapids & few others ARE primates ( cladistic analysis ) Eocene- Geography & climate - Not so hot as paleocine- Continuous decline of world temperatures -> ice masses formed -> world got drier, oceans shrunk, and plants don’t grow as well Two main Eocene primate families 1) Adapidae- Body size : 100g to 6900g – large variety -...
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This note was uploaded on 04/25/2010 for the course ANT ANT100Y1 taught by Professor Lehmn during the Spring '06 term at University of Toronto.

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Lehman_lecture4 - 09.10.19 Lecture 4 Primate Evolution...

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