Lets face it – without a face no-one would recognise us, nor would we be able to guess what others might be thinking or feeling.
Faces and their subtle degrees of symmetry and expression have defined human beauty and tragedy throughout past millennia of art and drama.
Faces, though, are not uniquely human, but are a shared feature with all back-boned animals (vertebrates), from sharks to squirrels. So when and where did the face first acquire its modern, recognisable shape?
We are all derived from placoderms
Placoderms were really gnarly armoured fishes that ruled the oceans, rivers and lakes of the world from about 440-360 million years ago. They were the first animals to evolve jaws and teeth, a truly landmark event in evolution that denotes the beginning of the lineage leading to sharks, bony fishes, amphibians, reptiles and mammals.
Written By: John Long
continue to source article at theconversation.com