For the most part the Australopithecus species A. afarensis , A. africanus , and A. anamensis either disappeared from the fossil record before the appearance of early humans or seem to have been the ancestors of Homo habilis . P. boisei and P. aethiopicus , on the other hand , continued to evolve along a separate path distinct and unrelated to early humans . For the most part the Australopithecus species A. afarensis , A. africanus , and A. anamensis either disappeared from the fossil record before the appearance of early humans or seem to have been the ancestors of Homo habilis , yet P. boisei and P. aethiopicus continued to evolve along a separate path distinct and unrelated to early humans .