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Chapter 5

ANTH 1210 Chapter 5: Topic 54

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ANTH 1210
Haskel J.Greenfield

OS82 Most apelike of the early hominin Paleoenvironmental studies Forest dweller, contrary to later hominids, open savannah Bipedal hominid Foramen magnum is forward More under sk ll, beginning of adaptation to bipedalism Foot arboreal grasping halluxbig toe Most primitive of the hominins Smaller canines, reduction in canines o little sexual dimorphism in canine (less than in chimps) omnivore patter (not like ape) small brain same size as a modern bonobo or female common chimpanzee much small than the rain of australopithecines (Lucy) slightly over a fifth the size of modern Homo sapiens Australopithecus Hominin genus 5 species: Anamensis, Afarensis, Africanus, Robustus, Boisei adaptive radiation Anamensis Discovered 1995 in Lake Turkana (Kenya) by R. and Meave Leakey Anam = Turkana word for lake (same genus that Dart found, but is earlier) 4 MYA old includes jaws, teeth, skull, limb bones (tibia, humerus) lived in open savannah environment apelike features large canines, parallel tooth rows (rectangular jaw structure) Homininlike features Straight rooted canine, rather than angled like apes Thick molar enamel not apelike Morphology of teeth thick enamel, broad
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