ANGEL FITOR / SCIENCE PHOTO LIBRARY ANGEL FITOR / SCIENCE PHOTO LIBRARY
Polychaete marine worm. Polychaetes are a class of annelid (segmented) worms. Each segment has a pair of fleshy un-jointed limb-like appendages (parapodia, red) which aid in locomotion and act as external gills. Photographed in the Mediterranean Sea, Alicante, Spain.
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