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The sandworm (Nersis) is an active predator that burrows in marine mudflats

Description
The best known polychaetes are sandworms (Nereis) – active predators that use chitin-strengthened jaws to capture other soft-bodied invertebrates

Fan worms and feather duster worms live in tubes of mucus and sand grains; head and tentacles protrudes from the tube

A trochophore larva with a band of cilia above its mouth forms during polychaete development
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