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[QUOTE]Originally posted by DD'eDeN: [QB] Human body shape/size change since 430,000 yrs ago Study reveals four stages of human body evolution. 31.8.15 Research into 430-ka fossils in N-Spain found that the evolution of the human body's size & shape has gone through 4 main stages. Arsuaga, Quam cs (2015 PNAS) studied the body size & shape in the human fossil collection from Sima de los Huesos, Sierra de Atapuerca. This site (c 430 ka) preserves the largest collection of human fossils found to date anywhere in the world. They found that the Atapuerca individuals were rel.tall, with wide muscular bodies & less brain mass rel.to body mass compared to Neanderthals. The Atapuerca humans shared many anatomical features with the later Hn not present in Hs, and analysis of their post-crania indicated that they are closely related evolutionarily to Hn. Rolf Quam: "... it suggests that the evolutionary process in our genus is largely characterized by stasis (i.e. little to no evolutionary change) in body form for most of our evolutionary history." Comparison of the Atapuerca fossils with the rest of the human fossil record suggests that the evolution of the human body has gone through 4 main stages, depending on the degree of arboreality (living in the trees) & bipedalism (walking on two legs). The Atapuerca fossils represent the 3rd stage: tall, wide & robust bodies & an exclusively terrestrial bipedalism, with no evidence of arboreal behaviors. This same body form was likely shared with earlier members of our genus (e.g. H.erectus) & some later members (e.g. Hn). Thus, this body form seems to have been present in the genus Homo for over a million years. It was not until the appearance of Hs, when a new taller, lighter & narrower body form emerged. Thus, Quam cs suggest that the Atapuerca humans offer the best look at the general human body shape & size during the last million years before the advent of Hs. http://archaeologynewsnetwork.blogspot.be/2015/08/study-reveals-four-stages -of-human-body.html?utm_source=feedburner&utm_medium=email&utm_campaign=Fee d:+TheArchaeologyNewsNetwork+(The+Archaeology+News+Network)#.Ved9N86ACt8 [/QB][/QUOTE]
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