An extinct order of aquatic arthropods that thrived in ancient seas and resembled giant scorpions with wide fins or paddles.
The ordinal name from the genus Eurypterus, using Greek 'eury-' (wide) and 'pteron' (wing/fin) plus '-ida' suffix for taxonomic orders.
Eurypterids ruled the seas for over 200 million years before vanishing, and studying their fossils helps scientists understand how early arthropods adapted to aquatic life!
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