One of the earliest human ancestors - that lived 400 million years ago - was a 'fish' with no jaw that used spines on its head to move through the water, study claims. The study suggests the jawless aquatic creatures started to diversify body and head shapes to suit different different environments much earlier than first thought. OSTEOSTRACANS: ANCIENT BOTTOM FEEDING 'LAZY LUMPS' Osteostracans - Latin for 'bony shells' - is a long extinct jawless fish species. There were among the most advanced of all jawless fish from the period. The varying head shapes of different species allowed them to thrive in a variety of positions within the water - from seabed to the open water.

Source: Daily Mail October 01, 2020 15:01 UTC