The genus Australopithecus is a group of extinct hominids that lived in Africa between 4 and 2 million years ago. Several synonyms have been used to describe different species within the genus, including Paranthropus, which is known for its robust features, and Kenyanthropus, which is thought to have lived alongside early Homo species. Another possible synonym is Ardipithecus, which is believed to be a more basal hominid that lived around 5.8-4.4 million years ago. While there is still debate among scientists about the exact classification of these early hominids, the study and comparison of their traits and characteristics continues to shed light on human evolution.