Sea Scorpion's Serated Tail Spine (image) University of Alberta Share Print E-Mail Caption This illustration shows a sea scorpion attacking an early vertebrate. Credit Nathan Rogers Usage Restrictions With credit to Nathan Rogers. Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.