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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

https://www.cbsnews.com/news/prehistoric-giant-swimming-head-creature/

The ancestor of the horseshoe crab measured more than half a meter in length and had a large head shell.