A phylum of aquatic animals including jellyfish, sea anemones, corals, and hydra that use stinging cells to capture food.
Modern scientific Latin coined from Greek knide (sting) + -aria (denoting a group). Named specifically for the defining characteristic—cnidae—that distinguishes this animal group.
Cnidarians have been stinging things for 600 million years, making them one of nature's oldest and most successful hunters!
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