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ANT - L05 [Oct 14 2010]

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University of Toronto St. George
Christopher Watts

L05 Oct 14 Paleocene (55.8 to 65.5 millions of years ago [MYA]) N The climate was much hotter and more humid (about 3x current) N Scientists think this is when primates first showed up N Paleocene & Primate-Like Mammals: Plesiadapiformes o Body Size tiny, shrew-sized to size of small dog o Niche likely solitary, nocturnal quadrupeds; well-developed sense of smell o Diet insects and seeds o Used to be classified as primates because of primate-like teeth and limbs that are adapted for arboreal lifestyle N Plesiadapids were not considered primates for a long time based on looks (phylogenetic). Why? o No postorbital bar o Claws instead of nails o Eyes placed on side of head o Enlarged incisors N The more modern approach suggests that Plesiadapids are primates o Primitive characters (patterns from current species) are ignored o Derived characters (patterns from common ancestors) are the ones that matter Eocene (33.9 MYA) N Climate is cooler than that of Paleocene but still hotter than current climate (2x) o Consistent pattern of lowering temperatures throughout the Eocene N There were two main Eocene primate families: N Adapidae o Body Size 100g to 6900g o Diurnal and nocturnal forms o Mainly arboreal quadrupeds, some may have been specialized leapers o Smaller adapids ate mostly fruit and insects, larger forms ate more fruit as well as leaves No current organism can break down and take energy from leaves o Possibly led to lemurs N Omomyidae o Body Size 45g to 2500g o Some nocturnal; others diurnal o Omomyids thought to been specialized leapers o Teeth adapted for eating insects and soft fruits, only few species were leaf-eaters o Possibly led to tarsiers o %-:89-0.,:809Z4,3L2,O8O44N,OLN04083920,39K0,7070O,90 Oligocene N Oligocene primates:
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