Dododex
ARK: Survival Evolved & Ascended Companion
Utility Tips

What is a eurypterid used for? eurypterid battling strategies in ARK: Survival Ascended & Evolved.
These aren't limited to under the water, and can float over rocks. If they manage to melee you, you're probably going to be knocked out by their tranq and slowly killed. They're easy to kill at range if you're smart, and very much worth it for the chitin and silica, so just be careful to either have a tamed Dino nearby or to stay at range
These other tips are right that they can knock you out quick but i LOVE these things for pearls and chitin. Just bring an army of sarcos and it’ll be a breeze. The sarcos will eventually go unconscious but if you have enough you can kill them all before that happens. There are a lot of them in Vikings bay, so easy chitin/pearls.