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Paranthropus boisei
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Paranthropus is an extinct genus of bipedal hominid that is descended from Australopethicus. All species of Paranthropus were bipedal, and many lived during when the Homo genus, also descended from Australopethicus, was prevelant. The behavior of Paranthropus was quite different from that of representatives of the Homo genus, in that it was not as adaptable to its envirenment or as resourceful. Evidence of this exists in the form of its physiology which was specifically tailored to a diet of grubs and plants. This would have made it more reliant on its envirenment than a member of the Homo genus.
Opinions differ as to whether the species aethiopicus, boisei and robustus should be included within the genus Australopithecus, the current consenses in the scientific community is that they should be placed in a distinct genus, Paranthropus, which is believed to have developed from the ancestral Australopithecus line. Up until the last half decade the majority, however, included all the species of both Australopethicus and Paranthropus were grouped in a single genus.
For the most part the Australopithecines species afarensis, africanus, and anamensis either disappeared off of the fossil record before the appearance of early humans or seem to have been the ancestors of Homo habilis, yet boisei and aethiopicus continued to evolve along a seperate path distinct and unrelated to early humans. Paranthropus shared the earth with some early examples of the Homo genus, such as Homo habilis, Homo ergaster, and possibly even Homo erectus. The Australopithecus aferensis and anamenis species, for the most part, had disappeared by this time. There were also signifant morphological differences between Australopithecus and Paranthropus. The later was more massively biult, specialized, and tended to sport sagital crests on the cranium which massive jaws were anchored to. Paranthropus seemed to be evolving away from human-likeness, not toward or preceding it. The contrast between Paranthropus and Homo was even greater.