EURYPTERIDS
- EURYPTERID [n]
- EURYPTERID, any of an order of large extinct aquatic Paleozoic arthropods related to the horsehoe crab [n]
- An extinct marine arthropod of a group occurring in the Paleozoic era. They are related to horseshoe crabs and resemble large scorpions with a terminal pair of paddle-shaped swimming appendages
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