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Name of the larva of corals and sea anemones

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 contain a larval phase and the larva is termed as planula. Numerous marine animals are sessile or practically sessile, such as sponges, corals and sea anemones. The mobile larval phase of their life cycle gives better spatial distribution of such species.

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