Researchers Have Discovered One Of The Biggest Animals From The Cambrian Period. The Long Head Ocean-Dwelling (OD) Animal, Named Titanokorys Gainesi, Related To The Horseshoe Crab, Was Discovered In The Burgess Shale In Canada. Gainesi Is Said To Be 1/2 Meter In Length Compared To Many Of The Other Cambrian OD Pinky-Finger-Size Organisms.
Scientists discover giant “swimming head” creature that lived 500 million years ago – CBS News
The ancestor of the horseshoe crab measured more than half a meter in length and had a large head shell.