ALEXANDER SEMENOV / SCIENCE PHOTO LIBRARY ALEXANDER SEMENOV / SCIENCE PHOTO LIBRARY
Ragworm head. Close-up of the head of a ragworm (Nereis virens), showing its mouthparts. Ragworms are marine annelid worms that burrow in wet sand and mud using parapodia (un jointed limb-like outgrowths) and setae (bristles) for locomotion. These structures are also used as gills for respiration.
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