Question: what are the rhabdites in flatworms?
Answer: Rhabdites are rod-shaped secretory products characteristic of the Turbellaria but also found in nemerteans, gastrotrichs and annelids. ... InProtodrilus, rhabdites are released along the ventrolateral margin of the worm and are secreted only when the worm tries to move by ciliary gliding against strong water currents.