Hominid Species Australopithecus boisei (was Zinjanthropus boisei ) A. boisei existed between 2.1 and 1.1 million years ago. It was similar to robustus , but the face and cheek teeth were even more massive, some molars being up to 2 cm across. The brain size is very similar to robustus , about 530 cc. A few experts consider boisei and robustus to be variants of the same species. Australopithecus aethiopicus , robustus and boisei are known as robust australopithecines, because their skulls in particular are more heavily built. They have never been serious candidates for being direct human ancestors. Many authorities now classify them in the genus Paranthropus . Homo habilis H. habilis , "handy man", was so called because of evidence of tools found with its remains. Habilis existed between 2.4 and 1.5 million years ago. It is very similar to australopithecines in many ways. The face is still primitive, but it projects less than in A. africanus . The back teeth are smaller, but still considerably larger than in modern humans. The average brain size, at 650 cc, is
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