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The fossil sacrum of Sterkfontein Sts 14Q (Australopithecus africanus) was compared with 96 human sacrums of known age so as to reveal its growth stage. Robinson (1972) noticed the presence of an immature trait (unfused intervertebral disc between S1 and S2) in this individual which in other respects is supposed to be a fully matured adult. Our study brings us to define a ''sub-adult'' category...
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