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Anthro Week 10

by: Olivia SaoBento

Anthro Week 10 ANTH 1001

Olivia SaoBento
GPA 3.76
Biological Anthropology
O'Malley, R

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Post exam 2, earl hominin origins
Biological Anthropology
O'Malley, R
Class Notes
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This 2 page Class Notes was uploaded by Olivia SaoBento on Friday November 6, 2015. The Class Notes belongs to ANTH 1001 at George Washington University taught by O'Malley, R in Fall 2015. Since its upload, it has received 69 views. For similar materials see Biological Anthropology in anthropology, evolution, sphr at George Washington University.

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Date Created: 11/06/15
Hominin Origins Was the LCA a knucklewalker 0 Yes 0 Pan and Gorilla are useful models to understand how bipedalism evolved 0 Should see traces of KW morphology in earliest hominins o No o If not what was their form of locomotion 0 Then KW is independently derived trait in Gorilla and Pan 0 Perhaps unlike Pan in other important ways Issues with fossil identification 0 Incomplete most complete skeleton is 40 complete 0 Distortion o Context 0 Small sample size 0 Possible homoplasy39s o Inter vs intra species variation 0 How much variation warrants separate species 0 Sexual dimorphism 0 Fossil species does not necessarily have any descendants Possible Hominines Sahelanthropus Tchadensis 0 Chad 0 No post crania o Uncertain dating 0 Apelike 0 Thin enamel on teeth 0 Small brain 0 Homininlike 0 Not prognathic 0 Small canines o Foramen magnum position Orrorin Tugenensis 0 Kenya 0 Chimpanzeesized ape o Femoral neck suggest bipedal walking 0 Apelike upper canine 0 Small teeth but thick dental enamel Ardipithecus Kadabbaramidus 0 Ethiopia 0 Multiple specimens but only one with extensive post crania o Disputed evidence for bipedalism o Disputed reconstructions of habitat o Dentition and carbon signal indicate fruitdominated diet Timing of PanHominin split affects how we interpret these early hominins Key things to Remember 0 744 mya 0 Classification as hominins is uncertain Relationship with later hominins is uncertain Sahelanthropus 0 Chad N Africa 0 Unlike other early hominins in facial shape 0 One skull Orrorin o E Africa 0 Fragmentary Ardipithecus o E Africa 0 Little to no sexual dimorphism 0 Numerous fragmentary specimens with one fairly complete 0 C3 diet like modern chimps Early Austropithecines Bipeds w some arboreal adaptations Sexual dimorphism Brain only slightly larger than chimps 4225 mya Australopithecus afarensis Ethiopia Kenya Tanzania quotLucyquot is most complete 40 Human like pelvis Woodland habitats Slightly larger than chimps Larger molars Small diastema Smaller canines Extreme sexual dimorphic Arboreal traits o Curved digits 0 Longer arms and shorter legs Valgus angle on femur Tracks found in volcanic ash 23 individuals Possible stone tool use


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