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ANT100Y1 (959)
Shawn Lehman (283)
Lecture

ANT100Y1: Lecture 4

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Department
Anthropology
Course
ANT100Y1
Professor
Shawn Lehman
Semester
Fall

Description
Lecture 4 Primate and Early Human EvolutionLecture Goals y General patterns of morphology and phylogenetic for fossil primates y What a hominin is in terms of taxonomy y Morphological trends in hominin evolutionBipedalismExpansion in brain sizeChanges in dental and cranial featuresPaleocene Primates y Geography and climate y Very different from present day conditions y Hotter more humid Primatelike mammals Plesiadapiformesy Body size tiny shrew sized to the size of a dog y Niche likely solitary nocturnal quadrupeds welldeveloped senses of smell y Diet insects and seeds y Used to be classified as primates because of primate like teeth and limbs that are adapted for arboreal lifestyleRecent Plesiadapids NOT primates y No postorbital bar y Claws instead of nails y Eyes placed on side of head y Enlarged incisorsFact More Recent Plesiadapids and few others ARE primates We have no fossil evidence 75 million year old which is believed to be the origin of primates The oldest fossil we have is 60 million years oldTwo Main Eocene Primate Families Atelidae y Body size 100g6900g y Diurnal and nocturnal y Mainly arboreal quads some may have been specialized leapers y Smaller Atelidae ate mostly fruit insects larger forms ate most fruit and leaves y Led to lemursOmomyidae y Body size 45g2500g
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