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Found in 2001 west of Lake Turkana in northern Kenya. ... Four Contemporaneous Hominid Species from Lake Turkana. Australopithecus boisie ... – PowerPoint PPT presentation
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Title: A1258150384tpeaT
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Overview of Human Evolution
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Hominids Through Time
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Lake Turkana, Kenya
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Kenyanthropus platyops
- Found in 2001 west of Lake Turkana in northern
Kenya. - Found in deposits dating between 3.2 and 3.5 mya
- Shows mixture of features, including very small,
chimpanzee like braincase and flat, vertically
straight face also seen in much later, more
human-like specimens from the same area - Distinct from A. afarensis which lived in the
same region and at the same time - However, some suggest the cranium is too damaged
to properly diagnose
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Kenyanthropus
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The Transition to More Modern-Like Hominids
Homo habilis
Homo rudolfensis
Homo erectus ergaster
- These hominids lived at approximately the same
time (1.8 1.6 mya) around Lake Turkana in
western Kenya - Cranium brow of H. habilis more similar to H.
erectus - Face skeleton of H. habilis , however, more
similar to that of australopithecines - Face skeleton of H. rudolfensis more similar
to H. erectus - Cranium of H. rudolfensis shaped quite
differently from H. erectus, appears
surprisingly modern, while face is very similar
to the much earlier Kenyanthropus - How these specimens relate to each other and
other hominids is still much debated!
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Homo habilis at Olduvai Gorge, Tanzania
- While brain case and face of H. habilis more
human-like - Skeletal remains discovered at Olduvai Gorge in
1986 by Don Johanson revealed limb sizes and
proportions nearly identical to those seen in
australopithecines - H. habilis had mosaic of ancestral and derived
features! - 2 distinct forms of human H. habilis H.
erectus--lived in East Africa slightly after 1.8
mya
- Found in 1968 _at_ Olduvai Hominid 24 above and at
far right, was most complete specimen of H.
habilis known until the discovery of similar
material at Lake Turkana in the mid 1970s - Brain size face showed definite advances
towards more human-like form than seen in
australopithecines
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The Turkana Boy Skeleton
- 90 of the skeleton of an adolescent male H.
erectus found west of Lake Turkana in the mid
1980s - Approx. 1.6 mya, a very modern skeleton,
virtually indistinguishable from that of fully
modern human - Represents early form of H. erectus called H.
ergaster retains features seen in other hominids
from East Africa (smaller facial bones, smaller
cranial capacity850 v. 950 ml) - Recent finds in the former Soviet rebulic of
Georgi dated to 1.8 mya have been interpreted as
a result of dispersal of early H. erectus out of
Africa - However, some suggest that H. erectus may have
evolved out of Africa and dispersed into the AF
continent when other native hominids were present
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Four Contemporaneous Hominid Species from Lake
Turkana
Australopithecus boisie
Homo erectus ergaster
Homo habilis
Homo rudolfensis
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P. boisie v. H. erectus ergaster Comparison
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First Dispersal Out of Africa at 1.8 mya or
Earlier?
Three Crania from Dmanisi, Georgia
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Homo erectus Facial Morphology
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Erectine Cranial Morphology
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Cranial capacity for Genus Homo
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Original Java Man Find
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The Daka H. erectus from Bouri, Ethiopia
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Newly Described H. erectus Cranium from Ceprano,
Italy
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Peking Man Reconstruction
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Yunxian, China H. erectus
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Sangiran 17, Indonesian H. erectus
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Theories of Modern Human Origins
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