noun
a class of sea anemones characterized by their long, slender tentacles
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Actinaria is a subclass of sea anemones within the phylum Cnidaria.
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I saw some cool Actinaria while snorkeling in the ocean.
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Those Actinaria creatures are like the rockstars of the sea!
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The Actinaria waved gracefully in the water, like dancers in a ballet.