ALEXANDER SEMENOV / SCIENCE PHOTO LIBRARY ALEXANDER SEMENOV / SCIENCE PHOTO LIBRARY
Polychaete marine worm (Pterosyllis finmarchica) on a natural sponge. Polychaetes are a class of annelid (segmented) worms. Each segment has a pair of fleshy un-jointed limb-like appendages (parapodia) which aid in locomotion.
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