Homo erectus 2010

Homo erectus 2010 - Homo erectus and the radiation of...

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Homo erectus and the radiation of humans out of Africa Found in Lower-Middle Pleistocene 1.8 mya to 250,000 ya The first hominid with an average cranial capacity within the modern range of variation (Kottak 2004:202; Smithsonian Institution)
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Classification recently revised to: Homo ergaster found 1.8-1.0 mya in east Africa and eastern Europe, but especially well known from 1.7 to 1.6 mya Some include it as Homo erectus Homo erectus evolved in Africa from H. ergaster and between 1.8 - 1.5 mya spread to Europe, Asia, and north Africa Archaic Homo: several species; Covered in third section of course, after test
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Mini-summary: Is Homo erectus one widely dispersed, variable species, or two (or more) distinct species, H. erectus and H. ergaster H. ergaster refers to early African, eastern Europe H. erectus More gracile crania, less pronounced brow ridges; Sometimes associated with more advanced tools
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Homo ergaster 1.8 to 1.0 mya ER 3733 1.8 mya Female 850 ml Rounded cranium, prominent brow ridge, small teeth, postorbital constr. relatively thin cranial bones, Long body adapted to hot climate Fully bipedal, no longer climbing trees Adult height 6 ft and 150 lbs estimated from young boy’s nearly complete skeleton
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KNM 15000 Turkana boy 1.6 mya The most complete H. ergaster skeleton A 9-12-yr-old boy Found in east Africa near Lake Turkana, Kenya 880 ml
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H. erectus 1.8 mya - 250,000 ya First human species known to have spread out from Africa in large numbers Probably split off from an early H. ergaster population Spread to Asia between 1.8-1.5 mya (Jolly & White 1995:268; Smithsonian Institution)
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Vocabulary Sagittal keel: raised ridge along midline of skull, part of shape of skull Postorbital Constriction: Narrowing of skull behind the face and eyes Occipital torus: ridge across the occipital bone at the back of the skull (muscle attachment)
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Cranial characteristics: Braincase low and narrow Has sagittal keel, postorbital constriction Brow ridge and occipital torus prominent Cranial capacity 800-1250 (x=1000) ml Bones thick, including the cranium Teeth smaller but lower jaw rugged No chin Australopithecus H. habilis H. erectus (Smithsonian Institution)
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H. habilis H. erectus skull widest at base From rear, looks angular Modern skull is widest at/above mid
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Postcranial characteristics: Body larger than H. habilis : we don’t have much postcranial. Fairly modern: short, stocky, built powerfully.
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Homo erectus 2010 - Homo erectus and the radiation of...

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