Biological Anthropology Notes 9

Biological Anthropology Notes 9 - Biological Anthropology...

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Biological Anthropology Notes November 27, 2006 - Australopithecus afarensis o ‘Lucy’ East Africa (Ethiopia and Chad?) 3.75-3 mya Brain size comparable to today’s apes Sexually dimorphic Males with bigger canines, diastema o Post-cranial skeleton Pronounced (extreme) sexual dimorphism Social correlates? Single male groups perhaps IMI > 100 Toes Long and curved Semi-divergent big toe? o Is it like a thumb? o Bipedalism Foramen magnum Centered under cranium Pelvis Ilium is short and broad and also rotated Femoral angle Angles into the knee, like us - Theories of the origins of bipedalism o Bipedalism gives a broader view of the surroundings Assumes a savannah environment Chimp ancestors in forests Hominid ancestors on savannah Standing would provide a better view to spot predators and resources because of the low-lying grass that would otherwise be blocking their view But earliest hominid fossils were found in a forested environment
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This note was uploaded on 04/05/2008 for the course ANTHRO 2B taught by Professor Egan during the Spring '08 term at UC Irvine.

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Biological Anthropology Notes 9 - Biological Anthropology...

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