Turbellarians are free-living (not parasitic). Most species are bottom dwellers that live in sand or mud, under stones and shells, or on seaweed. Their body is covered with a layer of cells called the epidermis. The ventral surface of the epidermis is frequently ciliated and contains gland cells that produce mucus. Very small turbellarians can swim using their cilia. Larger tubellarians secrete slime trails of mucus over which they glide, using their cilia to propel them. They have sensory receptors in their head region that can detect light, chemicals, and movement.
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