Polychaete marine worm
Polychaete marine worm (Chone infundibuliformis) surrounded by brittle stars. 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 and act as external gills. Photographed in the White Sea, Russia., by ALEXANDER SEMENOV/SCIENCE PHOTO LIBRARY
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