What is the name of the larva of corals and sea anemones? What is the biological importance of that larval stage?

What is the name of the larva of corals and sea anemones? What is the biological importance of that larval stage?
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Sexual reproduction in corals and sea anemones have a larval stage and the larva is called planula. Many marine animals are sessile or practically sessile, like sponges, corals and sea anemones. The mobile larval stage of their life cycle provides better spatial distribution of these species. Image Diversity: planula
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