How do free-living flatworms use mucus and adhesive secretions?

In free-living flatworms, known as turbellarians, mesenchymal gland cells produce secretions that are essential for movement and survival. These organisms utilize two primary types of secretions:

• Slimy Mucus: Flatworms secrete a copious stream of mucus to facilitate locomotion. This slimy material serves as a surface over which the animal glides, particularly when moving via ciliary activity. The mucus layer not only attaches the flatworm to the substrate but also elevates the body, providing the necessary clearance for the cilia to beat effectively.12
• Adhesive Substances: Other mesenchymal glands produce adhesive secretions used for several critical functions, including capturing prey, anchoring the animal to surfaces, and cementing egg capsules to suitable locations.1

While smaller flatworms rely on ciliary activity and mucus for movement, larger species must employ muscular contractions for propulsion, as ciliary forces are insufficient for their size.2