This scorpion-like aquatic predator has a pair of large pincers and a spiny carapace that clicks and grinds as it moves.
Spiny Eurypterid CR 9
Spiny Carapace (Ex)
Thousands of razor-sharp spines cover the carapace of a spiny eurypterid. Any creature that attacks a spiny eurypterid with a light weapon, natural attack, or unarmed strike takes 1d6 points of piercing damage. Any creature that grapples or is grappled by a spiny eurypterid automatically takes 2d6 points of piercing damage each round that the grapple is maintained.
Environment warm oceans
The spiny eurypterid is a voracious predator that swims in deep tropical waters.
Pathfinder Roleplaying Game Bestiary 6 © 2017, Paizo Inc.; Authors: Robert Brookes, Benjamin Bruck, John Compton, Paris Crenshaw, Adam Daigle, Crystal Frasier, James Jacobs, Thurston Hillman, Tim Hitchcock, Brandon Hodge, Jason Keeley, Isabelle Lee, Jason Nelson, Tim Nightengale, F. Wesley Schneider, David Schwartz, Mark Seifter, Todd Stewart, Josh Vogt, and Linda Zayas-Palmer.