euro, 宽的，词源同aneurysm, Europe. -pt, 翅膀，词源同feather, compete.
英文词源
eurypterid (n.)
fossil swimming crustacean of the Silurian and Devonian, 1874, from Greek eurys "broad, wide" (see eury-) + pteron "feather, wing" (see pterodactyl); so called from their swimming appendages.