The fragmentary facial bones belong to Homo affinis erectus, an esoteric offshoot of our family tree that inhabited Spain ...

These are skull casts from human evolution. Left to right: Australopithecus afarensis, Homo habilis, Homo ergaster, Homo erectus and Homo neanderthalensis. Disclaimer: AAAS and EurekAlert!

erectus, until further discoveries began to muddy the waters. A total of five skulls – four of which have their jaws attached – have now been recovered and are officially designated as Homo georgicus.

The skull, which they found in South Africa, is of the species Paranthropus robustus, a cousin species to our predecessors, ...