The lettuce sea slug, scientifically known as Elysia crispata, is a unique marine opisthobranch gastropod mollusk native to the shallow tropical reefs, lagoons, and coral cays of the Caribbean and Florida Keys. Reaching an average size of 1.5 to 3 inches (3.8 to 7.5 centimeters) in length, it is named for the elaborate, ruffled parapodia ...
