any of an extinct order (Eurypterida) of large, aquatic arthropods of the Paleozoic Era, similar to the horseshoe crab and sometimes reaching a length of c. 1.8 m (c. 6 ft)
Origin of eurypteridfrom Modern Latin Eurypterida from Classical Greek eurys, broad + pteron, feather, wing: so named from a pair of broad swimming appendages
Any of various large segmented aquatic arthropods of the order Eurypterida that existed from the Ordovician Period to the Permian Period, having a long tail often with a spinelike appendage at the tip. Also called sea scorpion .
Origin of eurypteridFrom New Latin Eurypterida order name from Eurypterus genus name eury- Greek pteron wing ; see -pter .