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Homo ergaster WT 15000 Nariokotome, Kenya 1.6 mya. Olduwan chopper Gadeb, Ethiopia 2.4-1.5 mya. Australopithecus afarensis A.L. 200-1, Hadar Ethiopia ~3 mya. Homo sp. early Homo A.L. 666-1, Hadar Ethiopia 2.3 mya. Australopithecus afarensis AL 288-1, Lucy Hadar, Ethiopia, 3.2 mya. - PowerPoint PPT Presentation
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Homo ergasterWT 15000 Nariokotome, Kenya
1.6 mya
Olduwan chopperGadeb, Ethiopia2.4-1.5 mya
Australopithecus afarensis
A.L. 200-1, Hadar Ethiopia~3 mya
Homo sp. early Homo
A.L. 666-1, Hadar Ethiopia
2.3 mya
Australopithecus afarensisAL 288-1, Lucy
Hadar, Ethiopia, 3.2 mya
Australopithecus afarensisHadar, Ethiopia, ~3 mya
• A. afarensis endocranial capacity = 387-550• consistent morphologies – more apelike than other
australopithecines• dimorphism = sexual or increase in size through time?
chimpanzee & A. afarensis share•subnasal prognathism•large anterior dentition•diastema between lateral incisor & canine•confluence of temporal & nuchal lines•broad pneumatized cranial base•note that A. afarensis is distinct from other australopithecines in these traits
the 3rd premolar (P3) in A afarensis = intermediate between chimpanzee 7 modern human morphologies
Australopithecus africanusSts 71, Sterkfontein South Africa, 2.5 mya
Australopithecus sebida, 1.9-1.78 mya South Africa
•endocranial capacity= 420-450 cc•not greater than A. africanus•likely contemporaneous with H. ergaster
Australopithecus sediba
Paranthropus boiseiOH 5
1.8 mya
Homo habilisKNM ER-1813
Koobi Fora, Kenya
1.9 mya
Homo habilis - “handy man”
•mixed morphologies•not a clearly identifiable taxon•potentially represent multiple species•demonstrates selective pressures & changes
KNM-ER 1470, Kenya1.8-1.9 mya
KNM ER-1813 Kenya
1.9 mya
Homo habilis from
Koobi Fora
Homo habilisKNM ER-
1813 Koobi Fora, Kenya
1.9 mya
•small brain (~510 cc)•small teeth•australopithecine-like
Homo habilisKNM-ER 1470, Koobi Fora, Kenya
1.8-1.9 mya
Homo habilisKNM-ER 1470,
Koobi Fora, Kenya
1.8-1.9 mya
•large brain (~750 cc)•large teeth
Homo rudolfensis
“solution”= create another species
Homo ergasterendocranial
capacity = 870 cc
KNM ER 15000, Homo
ergaster, Nariokotome,
Kenya, 1.5 mya
Homo ergasterWT 15000 Nariokotome, Kenya
1.6 mya
Homo ergaster, Kenya, 1.6 mya
Homo ergaster~1.8-1.7 mya•possibly as late as 600 kya•considered ancestral to all subsequent Homo•increased brain size•increased body size•possibly more modern growth & development
Homo ergaster, Swartskrans, South Africa,1.8-1.9 mya
•contemporaneous with P. robustus in South Africa•dental eruption may be more modern•tooth crown formation may be more apelike
Australopithecus afarensis
L.H.-4, Laetoli, Tanzania3.6 mya Homo ergaster
KNM-ER 992, Kenya~1.5 mya
Homo ergaster, OH9, Olduvai Gorge, Tanzania, ~1.2 mya
Homo ergaster KNM-ER 3733, Koobi Fora, Kenya
1.75 mya
Homo erectus, Daka, Middle Awash Valley,
Ethiopia, 1-0.8 mya
resembles H. erectus in:•endocranial capacity =995 cc•broad base•sagital keelresembles H. ergaster in:•thin vault bones•height of vault•no occipital torus
H. Erectus or H. ergaster?,
Dmanisi, Georgia,
1.75-2.0 mya
Reorganization of :•limb proportions•longer legs•shorter arms•trunk dimensions•ribcage=more barrel shaped •gut area reduced
Brain
•not just an increase in size•differences in brain organization•cognition•thought•emotions•brain is a costly tissue•affects dietary needs•growth & development•birth
Comparative primate allometric expectations of proportions of human
organ mass
Human gut lengths short•compared to other primates of our size•longer gut lengths associated with processing high volumes of low-quality foods
Selection on hominins appears to be:•on increased cognition-grow the size of the brain•support that through higher quality foods•and reduction in another costly tissue•the gut•is selection primarily on brains?•or on increased dietary quality?
complex interrelationship between diet, brain size increase, behavior, & morphology
antelope humerus, Olduvai Gorge, Tanzania, ~1.8 mya
David Brill
FLK “Zinj” site in Olduvai Gorge, Bed 1 deposits, 1.8-1.76 mya •~100 bones show cutmarks-percussion marks•3,500 large mammal bones•2,500 Olduwan tools•hunting?•scavenging”?•carnivore remains? •natural death?•
C. K Brain
•questioned associations of bones with australopithecines as food remains•initated modern taphonomic research
Taponomycomplex sources of deposition of animal bones in sites with archaeological remains and hominin fossils•natural death•carnivores•geologic accmualtion•hominins
Cutmarks•identifying stone tool marks•natural scratches•overprinting•excavator marks•using them to understand potential butchering patterns
Cladistics
Can get varying relationships depending on emphasis of different traits
multiple contemporaneous hominins-what specializations?
Paranthropus boisei
Homo habilis
Homo rudolfensis
Homo ergaster
Scientific American 8/25/2003:22-23
Homo ergasterWT 15000 Nariokotome, Kenya
1.6 mya
Acheulean handaxe