What are the main differences between the genera Australopithecus and Paranthropus?

What are the main differences between the genera Australopithecus and Paranthropus? What occurred in the Late Pliocene that may have been responsible for the appearance of the genera Paranthropus and Homo? We can ask the question: “What does it mean to be hominine?” The answer to this question can be approached from biological, sociological, psychological, philosophical, and evolutionary perspectives. What would be your answer to this question?