Question

Which is the most primitive of the robust australopithecines?

Answer 1

Robust australopithecines are conventionally sorted into

three species: a single species from South Africa, Australopithecus robustus [1.8 to 1.5 million years ago (Ma)] (1), and in East Africa, A. aethiopicus (2.7 to 2.3 Ma) and A. boisei (2.3 to 1.3 Ma) (2).

Answer 2

Afarensis as the most primitive of the australopithecines and allow us to discriminate between its facial morphology and that of A.