Fun facts: A Flatworm has a single opening to its stomach, in the middle of its underside. The Flatworms in vernal pools can stick this pharynx (throat/mouth) into their prey. Like a short vacuum cleaner hose, it sucks out the insides of their prey.They also use it to push wastes out of their bodies.escription: Although they are called Flatworms, these invertebrates are not flat. They are round-bodied with a flat belly. They are longer than they are wide. They are pointed at each end.
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