ALEXANDER SEMENOV / SCIENCE PHOTO LIBRARY ALEXANDER SEMENOV / SCIENCE PHOTO LIBRARY
Polychaete marine worms (Pseudopotamilla reniformis). 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.
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