Question: what are the major difference between gracile and robust australopithecines?
Answer: It is known from a partial skull. ... Australopithecus afarensis and africanus, and the other species above, are known as gracile australopithecines, because of their relatively lighter build, especially in the skull and teeth. (Gracile means "slender", and in paleoanthropology is used as an antonym to "robust".)