Cavolinia tridentata is a species of sea butterflies, floating and swimming sea snails or sea slugs, pelagic marine gastropod molluscs in the family Cavoliniidae. It is a common species and is widespread, being found in European waters, the Atlantic Ocean, the Caribbean Sea, the Gulf of Mexico, the Indian Ocean and in the Pacific Ocean. It lives in the photic zone of the ocean between 0 and 30 m in depth.

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