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Homo erectus: Difference between revisions
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{{cquote|Now that comparable data is available it appears clear that if ''H. sapiens'' includes all the people alive in the world today, their ancestors in the Late Pleistocene and “archaic” ''H. sapiens'' like Dali and Xujiayao then vault thickness can not be used to distinguish ''H. erectus'' from ''H. sapiens''.<ref name=brown/>}} | {{cquote|Now that comparable data is available it appears clear that if ''H. sapiens'' includes all the people alive in the world today, their ancestors in the Late Pleistocene and “archaic” ''H. sapiens'' like Dali and Xujiayao then vault thickness can not be used to distinguish ''H. erectus'' from ''H. sapiens''.<ref name=brown/>}} | ||
Other researchers have shown that mixtures of ''Homo erectus'' and ''Homo sapiens'' traits occur at many locations around the globe. Skulls with ''Homo erectus''-like features are found in location such as Indonesia and Africa. Thick-vaulted and gracile (thin-vaulted) skulls are often found to co-occur in the same strata showing that they lived at the same time and place.<ref name=woodmorappe/> | Other researchers have shown that mixtures of ''Homo erectus'' and ''Homo sapiens'' traits occur concurrently at many locations around the globe. Skulls with ''Homo erectus''-like features are found in location such as Indonesia and Africa. Thick-vaulted and gracile (thin-vaulted) skulls are often found to co-occur in the same strata showing that they lived at the same time and place.<ref name=woodmorappe/> | ||
When the cranial capacity of ''Homo erectus'' is compared with ''Homo sapiens'' the morphological distinctions blur even further. ''Homo erectus'' has a cranial capacity from 780 cc to about 1225 cc, whereas modern humans have a capacity from 700 cc all the way up to 2200 cc. Clearly ''H. erectus'' falls with the natural range of modern humans in not only vault thickness, but cranial capacity as well. Neanderthals have also been shown to fall within the range of modern humans, having a skull capacity ranging from 1200 cc to 1650 cc. In fact, the skull morphology of the ''Homo erectus'' is virtually identical to Neanderthal - differing only by size.<ref name=lubenow128>Lubenow p. 128</ref> | [[File:Homo erectus pelvis.jpg|thumb|250px|Homo erectus was previously thought to produce babies with relatively small brain capacity. However the discovery of the pictured pelvis has shown that they were actually capable of birthing babies with a cranial circumference very close to the lower end of the range of our own species. The Homo erectus shown could have produced a baby with a cranial circumference of 318 mm, while modern day babies vary from 320 to 370 mm.<ref>[http://www.nsf.gov/news/news_summ.jsp?org=NSF&cntn_id=112620 Discovery Questions Intelligence of Human Ancestor] National Science Foundation, Press Release 08-203, November 18, 2008.]] | ||
When the cranial capacity of ''Homo erectus'' is compared with ''Homo sapiens'' the morphological distinctions blur even further. ''Homo erectus'' has a cranial capacity from 780 cc to about 1225 cc, whereas modern humans have a capacity from 700 cc all the way up to 2200 cc. Clearly ''H. erectus'' falls with the natural range of modern humans in not only vault thickness, but cranial capacity as well.<ref name=lubenow128>Lubenow p. 128</ref> The close comparison was confirmed by a discovery in 2008 of a ''Homo erectus'' pelvis, which showed that their infants could have had a head much larger than previously thought. According to Sileshi Semaw, a paleoanthropologist at the Stone Age Institute and Indiana University-Bloomington, H. erectus infants could have had a head size of 318 mm in circumference, which is right at the lower end of the spectrum of modern day human whose cranial circumferences at birth typically range from 320-370 millimeters.</ref> Neanderthals have also been shown to fall within the range of modern humans, having a skull capacity ranging from 1200 cc to 1650 cc. In fact, the skull morphology of the ''Homo erectus'' is virtually identical to Neanderthal - differing only by size. <ref name=lubenow128>Lubenow p. 128</ref> | |||
Lubenow comments: | Lubenow comments: | ||
