DR KEITH WHEELER / SCIENCE PHOTO LIBRARY DR KEITH WHEELER / SCIENCE PHOTO LIBRARY
Freshwater flatworm. Macrophotograph of a Dugesia lugubris flatworm. This non-parasitic flat worm is covered in cilia, which enables it to glide in water, such as in a pond, and also in moist leaf litter, as on this beech leaf. When disturbed it twists its body to set off in a new direction. The eye spots (ocelli, upper centre) help locate prey. This flatworm is carnivorous, feeding on small crustaceans and insect larvae. The mouth is on the underside of the body, and leads to the gastrovascular cavity where digestion takes place. Excretion is through pores in the body surface, and respiration also takes place through the external surface.
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