Answer :

Skulls are less compact and zygomatic arches are less formed  is the reason behind Paranthropus and australopithecines as a group differ from members of the genus homo .

Paranthropus skull included  large premolar and molar teeth and a robust or strongly built lower jaw. Australopithecine species includes the difference in the thickness of the bones they have thin cranium .

Australopithecus were 120 cm tall, and the cranial capacity were also large. It had a low forehead, protruding face, lack of chin and low brain capacity.  They were adapted for tree climbing, have very small brain, and a long line jaws .

To learn more about Australopithecus , here

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