A trochophore is a free-swimming larval stage found in certain invertebrates, particularly in the phylum Mollusca and Annelida. This larval form is characterized by a distinct band of cilia that encircles the body, allowing for movement and feeding in the water. Trochophores typically develop from fertilized eggs and play a crucial role in the life cycle of these organisms. During the trochophore stage, the larvae undergo significant growth and development before transforming into more complex forms. This stage is essential for dispersal, as trochophores can travel long distances in the ocean, helping to ensure genetic diversity and the colonization of new habitats.