Word: robustus
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Dates: during 1980-1989
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...fossil record had also apparently shown that the australopithecines evolved in an orderly way: first came afarensis, followed by africanus, then robustus and boisei. But the age and form of WT 17000 convinced Leakey and Walker that the lineage was not simple after all. Boisei did not descend from robustus, and probably not even from afarensis...