Eurypterid meaning

yo͝o-rĭp'tər-ĭd
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.
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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)
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A large, prehistoric, carnivorous arthropod, of the class Eurypterida, thought to be one of the first animals to venture onto land.
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Origin of eurypterid

  • From New Latin Eurypterida order name from Eurypterus genus name eury– Greek pteron wing –pter
    From American Heritage Dictionary of the English Language, 5th Edition