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ireland3e_lecture_ch02

ireland3e_lecture_ch02 - Chapter 2 Where Do We Come From...

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8/18/2011 1 Chapter 2 Where Do We Come From and Where Do We Fit? Human Taxonomy The taxonomy of modern humans Kingdom Animalia includes animals such as insects, man, earthworms and sharks Phylum Vertebrata includes animals such as fish, snakes, birds and lizards Class Mammalia includes animals such as the whale, bear, dog and squirrel Order Primates includes animals such as lemurs, monkeys, and apes Family Hominidae includes human ancestors such as Astralopeithicus afarensis (“Lucy”) Genus - Homo includes human ancestors such as Homo erectus , Homo ergaster, and Homo habilis Species sapiens includes ONLY Homo sapiens (modern day humans)
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8/18/2011 2 Homo sapiens Homo sapiens are unique, they possess an upright bipedal stance opposable thumbs an enlarged brain case the capacity for complex speech communication Order Primates All primates share a common ancestor that lived about 60 million years ago The Order is characterized by fingernails and toenails stereoscopic vision with forward- facing eyes five-digit hands with opposable thumbs allowing a firm grasp with precise control
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8/18/2011 3 Human Evolution 25 million yrs ago the ancestor of apes and humans diverged from the ancestors of old-world monkeys Chimpanzees and humans diverged most recently from a common ancestor Most scientists agree that humans evolved in Africa when a primate began to walk upright as its usual form of locomotion Human Evolution
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